阅读说明：本技术 一种绳索取芯偏轴防倾斜钻具 (Rope core-taking off-axis anti-inclination drilling tool ) 是由 李亚东 赵宝聚 付厚起 冯启伟 宫海明 李大兜 耿安凯 冯园园 于 2021-08-27 设计创作，主要内容包括：本发明涉及地质探测装置技术领域,且公开了一种绳索取芯偏轴防倾斜钻具,包括钻柱、位于钻柱内部的内岩心管以及用于打捞内岩心管的打捞器,所述钻柱的底部设置有钻头,顶部设置有水接头,所述内岩心管的顶部设置有打捞矛头,所述打捞器包括外管,所述外管的内腔中滑动设置有弹性锁芯以及滑动卡接有挤压弹性锁芯的施压柱,所述外管的内腔中还设置有用于锁定打捞矛头的卡接件,所述弹性锁芯的内壁滑动挤压卡接件,所述施压柱施压所述弹性锁芯以使得所述卡接件脱离锁定位置。本发明中,打捞器与打捞矛头的脱离工作不需要将打捞器回收至井口,在钻柱内即可实现脱离,而且操作过程简单有效,使得打捞器的取出工作十分轻松。(The invention relates to the technical field of geological detection devices and discloses a rope core-taking off-axis anti-inclination drilling tool which comprises a drilling string, an inner core tube and a fisher, wherein the inner core tube is positioned in the drilling string, the fisher is used for fishing the inner core tube, a drill bit is arranged at the bottom of the drilling string, a water joint is arranged at the top of the drilling string, a fishing spearhead is arranged at the top of the inner core tube, the fisher comprises an outer tube, an elastic lock cylinder and a pressing column, the pressing column is connected with the elastic lock cylinder in a sliding and clamping mode, the clamping piece is used for locking the fishing spearhead and is arranged in the inner cavity of the outer tube, the clamping piece is extruded in the sliding mode on the inner wall of the elastic lock cylinder, and the pressing column presses the elastic lock cylinder to enable the clamping piece to be separated from a locking position. According to the invention, the fisher and the fishing spearhead can be separated without being recovered to a wellhead, and the fisher can be separated in a drill string, and the operation process is simple and effective, so that the fisher is very easy to take out.)

1. The utility model provides a wire core off-axis prevents slope drilling tool, includes drilling string (1), is located inside inner core pipe (4) of drilling string (1) and is used for salvaging fisher (3) of inner core pipe (4), the bottom of drilling string (1) is provided with the drill bit, and the top is provided with water swivel, the top of inner core pipe (4) is provided with salvages spearhead (401), its characterized in that: the fisher (3) comprises an outer pipe (301), an elastic lock cylinder (303) and a pressure applying column (302) for extruding the elastic lock cylinder (303) are slidably arranged in an inner cavity of the outer pipe (301), a clamping piece (314) used for locking the fishing spearhead (401) is further arranged in the inner cavity of the outer pipe (301), the clamping piece (314) is slidably extruded on the inner wall of the elastic lock cylinder (303), and the pressure applying column (302) applies pressure to the elastic lock cylinder (303) so that the clamping piece (314) is separated from a locking position.

2. A rope coring anti-tilt drill as defined in claim 1, wherein: the bottom spiro union of outer tube (301) has lid (304), the bottom of lid (304) is formed with the bulge tube along the axle center inboard, joint spare (314) slide grafting is on the bulge tube, the length of joint spare (314) is greater than the wall thickness of bulge tube, the outer wall of bulge tube and the inner wall sliding connection of elasticity lock core (303), be connected with spring (309) between bulge tube and the elasticity lock core (303), fishing spear head (401) insert in the inner chamber of bulge tube.

3. A rope coring anti-tilt drill as defined in claim 2, wherein: the elastic lock cylinder is characterized in that an upper cavity (308), a middle cavity (316) and a lower cavity which are communicated with each other are arranged inside the elastic lock cylinder (303), the middle cavity (316) is in a circular truncated cone shape, the upper cavity (308) and the lower cavity are both cylinders, gaps are formed between the inner wall of the middle cavity (316) and the inner wall of the lower cavity and the outer wall of the protruding pipe, and the vertical distance between the inner wall of the middle cavity (316) and the inner wall of the protruding pipe is not smaller than the length of the clamping piece (314).

4. A rope coring anti-tilt drill as defined in claim 3, wherein: the interior fixed mounting of cavity has permanent magnet (315) down, permanent magnet (315) and joint spare (314) adsorb and are connected.

5. The rope coring anti-tilt drill as defined in claim 4, wherein: the permanent magnet (315) is a ring magnet.

6. The rope coring anti-tilt drill as defined in claim 5, wherein: the quantity of joint spare (314) is a plurality of to be equidistant circumference arrangement, the cuboid shape of joint spare (314) for having the oblique angle, the oblique angle of joint spare (314) is located the inner chamber of bellying pipe, the inclined plane at oblique angle is located the bottom of joint spare (314) and toward the axle center direction tilt up of bellying pipe.

7. The rope coring anti-tilt drill as defined in claim 6, wherein: the outer end face of the clamping piece (314) is fixedly provided with a limiting cap, the limiting cap is a hemisphere, the arc-shaped face of the limiting cap is located on the outer side, and a groove hole matched with the clamping piece (314) and the limiting cap is formed in the protruding pipe.

8. The rope coring anti-tilt drill as defined in claim 7, wherein: the area of the plane on the inner side of the limiting cap is larger than that of the outer end face of the clamping piece (314).

9. The rope coring anti-tilt drill as defined in claim 8, wherein: the inside surface of elasticity lock core (303) is provided with recess (311) with each joint spare (314) one-to-one, there is push pedal (313) recess (311) inside through pressure spring (312) sliding connection, push pedal (313) are the arc, and under the natural state, the inside surface of push pedal (313) and the inside surface of elasticity lock core (303) flush.

10. A rope coring anti-tilt drill as defined in claim 1, wherein: the bottom circumference of the pressure application column (302) is provided with a plurality of first helical teeth (306), the top circumference of the elastic lock cylinder (303) is provided with second helical teeth (305) which are in one-to-one correspondence with the first helical teeth (306), the first helical teeth (306) are in sliding connection with the second helical teeth (305), the first helical teeth (306) are provided with first sliding grooves (318), the first sliding grooves (318) penetrate through the lower half part of the pressure application column (302), the second helical teeth (305) are provided with second sliding grooves (307) and clamping grooves which are different in height, guide rods (310) which are in one-to-one correspondence with the first sliding grooves (318) are fixedly installed on the inner wall of the outer tube (301), the guide rods (310) are in sliding insertion connection with the first sliding grooves (318) and the second sliding grooves (307), and the bottom of the guide rods (310) is in sliding connection with the second helical teeth (305).

Technical Field

The invention relates to the technical field of geological detection devices, in particular to a rope core-taking off-axis anti-inclination drilling tool.

Background

In the aspect of geological exploration, research staff need collect the soil property of the subsurface, and the device that uses is wire line core drill, and wire line core drill is a drilling tool that does not carry the drilling core, and in the drilling process, when the core barrel is full or the core blocks up, need not promote whole drilling columns in the hole to the surface, but salvage the interior core barrel from the drilling column with wire rope with the help of special fishing tool.

The mode that the core was got to the rope has vertical drilling to get the core, horizontal drilling gets the core and the core is got to the inclined drilling, and no matter which kind of mode, for the smooth completion that the core was got to the rope, need guarantee the drilling tool at the in-process of work, avoid appearing the phenomenon of off-axis slope, the core drilling tool of the rope that has now for this reason is mostly off-axis anti-tilt drilling tool. The rope coring anti-inclination drill mainly comprises a drill column, a drill bit, a water joint, an inner core pipe, a fisher and a centralizer, wherein the water joint is positioned above the drill column and used for inputting drilling fluid into the drill column, the drill bit is positioned at the bottom of the drill column and used for drilling, the inner core pipe is positioned in the drill column and used for loading soil mass under the ground, a fishing spear head is arranged at the top of the inner core pipe and matched with the fisher, the fishing spear head can be clamped by the fisher, a steel wire rope is connected to the top of the fisher and connected with an external steel wire winding device, the inner core pipe can be taken out along the drill column through the steel wire winding device, and therefore the soil mass in the inner core pipe is taken out.

In the drilling process, the phenomenon of drill burning is often caused by misoperation or drilling fluid system failure, so that the inner core tube is stuck in a drill string, in this case, the drill string needs to be recovered to a wellhead and then taken out, at the moment, the fisher is positioned in the drill string and is stuck with the fishing spear at the top of the inner core tube, if the fisher is not taken out from the drill string in time, the recovery work of the drill string is seriously hindered, and in the prior art, the fisher cannot be easily and effectively separated from the fishing spear in the drill string, so that the taking out work of the fisher is very difficult.

Disclosure of Invention

The invention aims to provide a rope coring and off-axis inclination prevention drilling tool, which aims to overcome the defects in the prior art.

In order to achieve the above purpose, the invention provides the following technical scheme: the utility model provides a wire core off-axis anti-tilt drilling tool, includes the drilling string, is located the inside interior core pipe of drilling string and is used for salvaging the fisher of interior core pipe, the bottom of drilling string is provided with the drill bit, and the top is provided with water swivel, the top of interior core pipe is provided with salvages the spearhead, the fisher includes the outer tube, slide in the inner chamber of outer tube and be provided with the pressure applying post that elasticity lock core and slip joint have extrusion elasticity lock core, still be provided with the joint spare that is used for the locking to salvage the spearhead in the inner chamber of outer tube, the inner wall slip extrusion joint spare of elasticity lock core, the pressure applying post is exerted pressure the elasticity lock core so that joint spare breaks away from latched position.

Foretell core off-axis drilling tool of preventing inclining is got to rope, the bottom spiro union of outer tube has the lid, the bottom of lid is formed with protruding pipe to the inboard side along the axle center, joint spare slides and pegs graft on protruding pipe, the length of joint spare is greater than the wall thickness of protruding pipe, the outer wall of protruding pipe and the inner wall sliding connection of elasticity lock core, be connected with the spring between protruding pipe and the elasticity lock core, salvage in the inner chamber that the spearhead inserted protruding pipe.

Foretell rope is got core off-axis and is prevented slope drilling tool, the inside of elasticity lock core is provided with last cavity, well cavity and lower cavity that is linked together, well cavity is the round platform form, it is the cylinder with lower cavity to go up the cavity, the inner wall of well cavity and the inner wall of cavity down all with the outer wall of bellying between be formed with gappedly, the vertical distance between the inner wall of well cavity and the bellying intraductal wall is not less than the length of joint spare.

Foretell rope is got core and is prevented inclining drilling tool off-axis, fixed mounting has the permanent magnet in the cavity down, the permanent magnet adsorbs with joint spare and is connected.

In the rope coring anti-inclination drilling tool with the eccentric shaft, the permanent magnet is an annular magnet.

Foretell rope is got core off-axis and is prevented slope drilling tool, the quantity of joint spare is a plurality of to be equidistant circumference arrangement, the cuboid shape of joint spare for having the oblique angle, the oblique angle of joint spare is arranged in the inner chamber of bellying pipe, the inclined plane at oblique angle is arranged in the bottom of joint spare and toward the axle center direction tilt up of bellying pipe.

Foretell rope is got core off-axis and is prevented inclining drilling tool, the outer terminal surface fixed mounting of joint spare has spacing cap, spacing cap is the hemisphere, the arcwall face of spacing cap is located the outside, be provided with the slotted hole with joint spare and spacing cap looks adaptation on the bellying.

In the rope core-taking off-axis anti-inclination drilling tool, the area of the plane on the inner side of the limiting cap is larger than the area of the outer end face of the clamping piece.

Foretell core off-axis drilling tool that inclines is prevented to rope, the medial surface of elasticity lock core is provided with the recess with each joint spare one-to-one, there is the push pedal the inside of recess through pressure spring sliding connection, the push pedal is the arc, under the natural state, the medial surface of push pedal and the medial surface of elasticity lock core flush.

Foretell rope is got off-axis and is prevented slope drilling tool, the bottom circumference of the post of exerting pressure is provided with a plurality of first skewed teeth, the top circumference of elasticity lock core is provided with the second skewed tooth with a plurality of first skewed teeth one-to-one, first skewed tooth and second skewed tooth sliding connection, be provided with first spout on the first skewed tooth, first spout runs through the lower half of the post of exerting pressure, be provided with highly different second spout and draw-in groove on the second skewed tooth, the inner wall fixed mounting of outer tube has the guide bar with a plurality of first spout one-to-ones, the guide bar is pegged graft with first spout and second spout slip, just the bottom and the second skewed tooth sliding connection of guide bar.

In the technical scheme, the anti-inclination drilling tool for rope core taking off the off-axis is provided with the elastic lock cylinder and the pressing column for pressing the elastic lock cylinder, when the fishing spear head is locked by the clamping piece, the pressing column is pressed to enable the pressing column to downwards press the elastic lock cylinder, the clamping piece can be separated from the fishing spear head after the elastic lock cylinder is pressed, so that the fisher is taken out, and the pressing mode of the pressing column can be carried out outside a well.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

FIG. 1 is an elevational view in cross section of a wireline coring anti-backup drill bit according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of an overshot provided by an embodiment of the invention;

FIG. 3 is an enlarged view of part A of the structure according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of an outer tube provided in accordance with an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an elastic lock cylinder provided in an embodiment of the present invention in an unlocked state in which the elastic lock cylinder is connected to a pressure applying column;

fig. 6 is a schematic structural diagram of an elastic lock cylinder provided in an embodiment of the present invention in a locked state in connection with a pressing column;

FIG. 7 is an enlarged view of the part B according to the embodiment of the present invention;

fig. 8 is an elevational sectional view of a weight member provided in an embodiment of the invention;

fig. 9 is a schematic structural diagram of a weight member according to an embodiment of the present invention.

Description of reference numerals:

1. a drill string; 2. a counterweight; 201. a body; 202. a connecting cover; 203. a weight increasing plate; 204. a cross bar; 205. connecting columns; 206. a second threaded hole; 207. a cord hole; 208. a first threaded hole; 209. a slot; 210. a traveler; 211. a ball bearing; 212. a push rod; 213. a chamber; 214. extruding the column; 215. grooving; 3. a fisher; 301. an outer tube; 302. applying a pressure column; 303. an elastic lock cylinder; 304. a cover body; 305. a second helical tooth; 306. a first helical tooth; 307. a second chute; 308. an upper cavity; 309. a spring; 310. a guide bar; 311. a groove; 312. a pressure spring; 313. pushing the plate; 314. a clamping piece; 315. a permanent magnet; 316. a middle cavity; 317. a roller; 318. a first chute; 4. an inner core tube; 401. fishing spearheads.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 9, a wireline coring anti-inclination drilling tool according to an embodiment of the present invention includes a drill string 1, an inner core tube 4 located inside the drill string 1, and a fisher 3 for fishing the inner core tube 4, wherein a drill bit is disposed at the bottom of the drill string 1, a water joint is disposed at the top of the drill string 1, and a fishing spear head 401 is disposed at the top of the inner core tube 4, and is characterized in that: the fisher 3 comprises an outer tube 301, an elastic lock cylinder 303 and a pressing column 302 which is used for sliding and clamping the elastic lock cylinder 303 are arranged in the inner cavity of the outer tube 301 in a sliding mode, a clamping piece 314 used for locking the fishing spearhead 401 is further arranged in the inner cavity of the outer tube 301, the clamping piece 314 is slidably pressed on the inner wall of the elastic lock cylinder 303, and the pressing column 302 presses the elastic lock cylinder 303 to enable the clamping piece 314 to be separated from a locking position.

Specifically, the rope coring off-axis anti-inclination drill provided by the embodiment of the invention can be used for exploring soil substances under the ground surface, so as to research and analyze the soil quality of the area. The drill string 1 mainly comprises a centralizer, an outer core tube, a drill collar, a downhole power top support, a drill rod, a driving drill rod and the like (the structure and the principle of the drill string 1 are the prior art, and are not described herein), the drill string 1 is connected with external power equipment, the drilling work is realized by matching with a drill bit and the drilling fluid, a water joint is used for conveying the external drilling fluid into the drill string 1 at high pressure, an inner core tube 4 is positioned in the drill string 1 and is used for loading soil substances under the ground surface, an fisher 3 is connected with an external winding device through a rope, the fisher 3 can lock a fishing spearhead 401 on the inner core tube 4, so that the inner core tube 4 filled with the soil can be taken out of a well through the winding rope, a clamping member 314 is used for locking the fishing spearhead 401, the upper half part of the fishing spearhead 401 is a cone, the lower half part of the fishing spearhead 401 is a cylinder, the diameter of the cylinder is smaller than that of a bottom surface circle, when the clamping member 314 is positioned at the bottom of the upper half of the fishing spearhead 401, the locking can be completed, the elastic lock cylinder 303 is used for controlling the locking and unlocking of the snap-in piece 314 to the fishing spearhead 401, the power source for controlling the locking and unlocking of the snap-in piece 314 by the elastic lock cylinder 303 is the pressing column 302, the pressing column 302 is positioned above the snap-in piece 314 and can extrude the pressing column 302, the top of the pressing column 302 penetrates out of the top of the outer tube 301, when an external force extrudes the top of the pressing column 302, the pressing column 302 moves downwards and extrudes the elastic lock cylinder 303 to slide, and the sliding of the elastic lock cylinder 303 can drive the snap-in piece 314 to lock and unlock the fishing spearhead 401. The operating principle of the rope coring anti-inclination drilling tool provided in this embodiment is that when the snap-in piece 314 locks the fishing spearhead 401, the top of the pressing column 302 is pressed out of the well, the pressing column 302 slides downwards along the inner cavity of the outer tube 301 after being pressed, and presses the elastic lock cylinder 303 downwards, the elastic lock cylinder 303 also slides downwards along the inner cavity of the outer tube 301 after being pressed, after the top of the pressing column 302 is pressed, the elastic lock cylinder 303 slides upwards to another height, so that the snap-in piece 314 is separated from the original locking position, and when the fishing spearhead 401 needs to be locked again, the top of the pressing column 302 can be pressed again to realize the purpose. In the prior art, when the inner core tube 4 is stuck in the drill string 1, the overshot 3 cannot be easily and effectively separated from the fishing spearhead 401 in the drill string 1, so that the overshot 3 is difficult to take out. The main innovation point of the invention is that the mechanism of the existing fisher 3 is improved, the fishing spear 401 can be locked and unlocked by pressing the top of the fisher 3, so that the fisher 3 can be easily separated from the fishing spear 401 in the drill string 1, and the fisher 3 can be easily taken out.

In this embodiment, by providing the elastic lock cylinder 303 and the pressing column 302 for pressing the elastic lock cylinder 303, when the fishing spearhead 401 is locked by the clamp 314, the pressing column 302 is pressed to press the elastic lock cylinder 303 downwards, the clamp 314 can be separated from the fishing spearhead 401 after the elastic lock cylinder 303 is pressed, so that the fisher 3 can be taken out, and the pressing mode of the pressing column 302 can be performed outside the well.

In this embodiment, the pressure applying mode to the pressure applying column 302 may use high-pressure drilling fluid, and when the high-pressure drilling fluid enters the drill string 1 through the water joint, the high-pressure drilling fluid directly impacts the top of the pressure applying column 302 along the inner wall of the drill string 1, so as to apply pressure to the top of the pressure applying column 302. Because the high-pressure drilling fluid is a necessary condition in the rope core drilling tool, other pressure applying equipment is not required to be additionally added, and the method is very convenient.

In this embodiment, the bottom spiro union of outer tube 301 has lid 304, and the bottom of lid 304 is formed with the bulge tube along the axle center inboard, and joint 314 slides and pegs graft on the bulge tube, and the length of joint 314 is greater than the pipe wall thickness of bulge tube, and the outer wall of bulge tube and the inner wall sliding connection of elasticity lock core 303 can improve the stability when elasticity lock core 303 slides, are connected with spring 309 between bulge tube and the elasticity lock core 303, and fishing spear head 401 inserts in the inner chamber of bulge tube. The first function of the cover body 304 is to realize the load bearing work after the clamping piece 314 and the fishing spearhead 401 are locked, when the outer pipe 301 is pulled by a rope to move upwards, the cover body 304 is driven to move upwards, and then the cover body 304 drives the fishing spearhead 401 locked by the clamping piece 314 to move upwards, so that the inner core pipe 4 is driven to move upwards; the second effect of lid 304 is used for realizing the support to spring 309, spring 309 sets up in the inner chamber of elasticity lock core 303, the top butt of bottom and boss pipe, the top butt of top and elasticity lock core 303 inner chamber, spring 309 is used for jacking up elasticity lock core 303, thereby make elasticity lock core 303 fix a position at a certain height, it is spacing still need to cooperate the top of elasticity lock core 303 to realize the purpose that elasticity lock core 303 fixes a position at a certain height completely, carry out spacing mode in the following and have detailed description to the top of elasticity lock core 303.

In the above structure, when the elastic lock cylinder 303 is not pressed by the pressing column 302, the elastic lock cylinder 303 is pressed under the elastic force of the spring 309, so that the elastic lock cylinder 303 is positioned at the first height, when the elastic lock cylinder 303 is pressed by the pressing column 302, the elastic lock cylinder 303 slides downwards, so that the spring 309 is compressed, after the pressing force is finished, under the effect of the spring 309, the elastic lock cylinder 303 is at the second height, the first height and the second height of the elastic lock cylinder 303 are alternately changed along with the pressing times of the elastic lock cylinder 303, and the two heights of the elastic lock cylinder 303 respectively correspond to the locking and unlocking of the snap 314 on the fishing spearhead 401.

In this embodiment, an upper cavity 308, a middle cavity 316 and a lower cavity which are communicated with each other are arranged inside the elastic lock cylinder 303, the middle cavity 316 is in a circular truncated cone shape, the upper cavity 308 and the lower cavity are both cylinders, gaps are formed between the inner wall of the middle cavity 316 and the inner wall of the lower cavity and the outer wall of the protruding tube, and the vertical distance between the inner wall of the middle cavity 316 and the inner wall of the protruding tube is not less than the length of the clamping piece 314. The inner wall of the upper cavity 308 is in sliding fit with the outer wall of the protruding tube, the upper cavity 308 is connected with the small-diameter opening of the middle cavity 316, the lower cavity is connected with the large-diameter opening of the middle cavity 316, the diameter of the upper cavity 308 is the same as that of the small-diameter opening of the middle cavity 316, smooth sliding of the clamping piece 314 between the upper cavity and the lower cavity is facilitated, and the diameter of the lower cavity is not smaller than that of the large-diameter opening of the middle cavity 316.

In the above structure, when the elastic lock cylinder 303 is located at two different heights, the clamping piece 314 is respectively located in the upper cavity 308 and the lower cavity, and along with the difference in height of the elastic lock cylinder 303, the clamping piece 314 switches back and forth between the upper cavity 308 and the lower cavity. Because the clamping member 314 is inserted into the protruding tube in a sliding manner, the length of the clamping member 314 is greater than the thickness of the protruding tube, and the inner wall of the upper cavity 308 is in sliding fit with the outer wall of the protruding tube, when the clamping member 314 is located in the upper cavity 308, the inner wall of the upper cavity 308 presses the outside of the clamping member 314, so that the clamping member 314 slides inwards, and at this time, the inner side end of the clamping member 314 is located in the inner cavity of the protruding tube, as shown in fig. 3, so that the fishing spearhead 401 is locked by the clamping member 314; when the clamping member 314 is located in the lower cavity, the clamping member 314 moves outward in the radial direction, because the vertical distance between the inner wall of the middle cavity 316 and the inner wall of the protruding tube is not less than the length of the clamping member 314, and the diameter of the lower cavity is not less than the diameter of the large-diameter opening of the middle cavity 316, so that the clamping member 314 can be completely removed from the inner cavity of the protruding tube, thereby losing the locking effect on the fishing spearhead 401 and disengaging the fishing spearhead 401 from the protruding tube.

In this embodiment, a limiting manner for limiting the top of the elastic lock cylinder 303 is that, in a preferred embodiment, a plurality of first helical teeth 306 are circumferentially arranged at the bottom of the pressing column 302, second helical teeth 305 corresponding to the plurality of first helical teeth 306 one to one are circumferentially arranged at the top of the elastic lock cylinder 303, the first helical teeth 306 and the second helical teeth 305 are slidably connected, a first sliding groove 318 is arranged on the first helical teeth 306, the first sliding groove 318 penetrates through the lower half part of the pressing column 302, second sliding grooves 307 and clamping grooves with different heights are arranged on the second helical teeth 305, guide rods 310 corresponding to the plurality of first sliding grooves 318 one to one are fixedly arranged on the inner wall of the outer tube 301, the guide rods 310 are slidably inserted into the first sliding grooves 318 and the second sliding grooves 307, and the bottoms of the guide rods 310 are slidably connected with the second helical teeth 305.

The first helical tooth 306 is a large saw-shaped tooth, the first sliding groove 318 divides the first helical tooth 306 into a left part and a right part, the right part is a part of the first helical tooth 306 with a longer length, the second helical tooth 305 is two small saw-shaped teeth integrally formed, the connecting position of the two small saw-shaped teeth is the clamping groove position on the second helical tooth 305, the second sliding groove 307 is positioned on one side of the two small saw-shaped teeth, the guide rod 310 is always inserted in the first sliding groove 318 in a sliding manner, the bottom of the guide rod 310 can be alternately positioned in the second sliding groove 307 and the clamping groove, and two states of the bottom of the guide rod 310 when the bottom of the guide rod 310 is positioned in the second sliding groove 307 and the clamping groove respectively correspond to two heights of the elastic lock cylinder 303. Whether the bottom of the guide rod 310 is located in the second sliding groove 307 or the slot, the side of the guide rod 310 abuts against the side of one of the small saw-shaped teeth, so that the second helical tooth 305 is limited by the guide rod 310, and the right half part of the first helical tooth 306 is located above the highest vertex of one of the small saw-shaped teeth, so that each time the pressing column 302 presses the top of the elastic lock cylinder 303, the right half part of the first helical tooth 306 is firstly pressed with the highest vertex of one of the small saw-shaped teeth on the second helical tooth 305, and when the guide rod 310 is completely separated from the second sliding groove 307 or the slot, the second helical tooth 305 rotates under the pressing of the first helical tooth 306, so that the elastic lock cylinder 303 rotates, and finally the guide rod 310 is alternately inserted into the second sliding groove 307 and the slot, so as to change the height of the elastic lock cylinder 303.

Because the guide rod 310 is fixedly installed on the inner wall of the outer tube 301, the position of the guide rod 310 is fixed, so that the first helical teeth 306 can only move linearly along the guide rod 310 without rotating, thereby realizing the guiding function of the pressing column 302, and when the elastic lock cylinder 303 loses the limit of the guide rod 310, the elastic lock cylinder can rotate in the inner cavity of the outer tube 301.

In the above structure, the elastic lock cylinder 303 is always abutted against the bottom of the guide rod 310 under the action of the spring 309, so that the top of the elastic lock cylinder 303 is limited. Specifically, the depth of the second sliding groove 307 is greater than the depth of the locking groove, when the bottom of the guide rod 310 is located in the second sliding groove 307, the clamping member 314 is located in the lower cavity of the elastic lock cylinder 303, and at this time, the clamping member 314 is in an unlocking state; when the bottom of the guide rod 310 is located in the slot, the clip 314 is located in the upper cavity 308 of the elastic lock cylinder 303, and the clip 314 is in a locked state.

The specific operation steps are that the bottom of the guide rod 310 is set to be located in the slot at this time, as shown in fig. 6, the right half of the first helical tooth 306 is located right above the highest vertex of one of the small saw-shaped teeth on the second helical tooth 305, when the top of the pressing column 302 is pressed to press down, the right half of the first helical tooth 306 moves down and presses the highest vertex of one of the small saw-shaped teeth on the second helical tooth 305, under the common limiting action of the inclined surface of one of the small saw-shaped teeth and the side edge of the other small saw-shaped tooth on the guide rod 310, the second helical tooth 305 does not rotate but moves down after being stressed until the bottom of the guide rod 310 is completely separated from the slot, at this time, under the action of the inclined surface at the bottom of the first helical tooth 306 and the inclined surface of one of the small saw-shaped teeth 305, the second helical tooth 305 rotates, thereby driving the entire elastic lock cylinder 303 to rotate, then, the bottom of the guide rod 310 is located at the top of another saw-shaped tooth, and slides towards the second sliding groove 307 along the inclined surface of the top of the saw-shaped tooth under the action of the pressing force until the side edge of the first inclined tooth 306 is attached to the side edge of the second inclined tooth 305, then the top pressure of the pressing column 302 disappears, and under the action of the spring 309, the elastic lock cylinder 303 is pressed upwards, so that the guide rod 310 continues to slide towards the second sliding groove 307 until sliding into the second sliding groove 307, and at this time, the second sliding groove 307 is firmly abutted to the guide rod 310 under the action of the spring 309, so that the exchange of the position where the guide rod 310 is located is realized, and when the guide rod 310 is located in the clamping groove again, the operation mode is the same, and details are omitted.

Since the guide bar 310 slides relative to the top of the second helical tooth 305 during the position adjustment process, in order to improve the smoothness of the relative sliding, a roller 317 is rotatably disposed at the bottom of the guide bar 310, and when the guide bar 310 slides relative to the top of the second helical tooth 305, the roller 317 rotates therebetween, thereby reducing the friction force and improving the smoothness during the sliding.

In order to make the snap-in member 314 smoothly move outward in the radial direction, thereby losing the locking of the fishing spearhead 401, a permanent magnet 315 is fixedly installed in the lower cavity, and the permanent magnet 315 is connected with the snap-in member 314 in an adsorption manner. By utilizing the adsorption of the permanent magnet 315 and the clamping member 314, when the clamping member 314 is located in the lower cavity, the permanent magnet 315 adsorbs the clamping member 314, so that the clamping member 314 has power moving outwards, thereby realizing the purpose that the clamping member 314 smoothly moves outwards along the radial direction.

In the above structure, the number of the first helical teeth 306 can be set according to the requirement, but is at least 3, and can be 3, 5, and the like.

Further, the permanent magnet 315 is a ring magnet, the permanent magnet 315 is fixedly mounted on the inner wall of the lower cavity or embedded in the lower wall, and no matter what mounting method, the diameter of the inner circle of the permanent magnet 315 can be equal to the diameter of the large-diameter opening of the middle cavity 316, so that the clamping piece 314 can be conveniently and smoothly switched between the middle cavity 316 and the lower cavity in a sliding manner.

In this embodiment, the number of the locking members 314 is plural, and the locking members are arranged circumferentially at equal intervals. The circumferential arrangement of the plurality of clips 314 can increase the stability of the fishing spearhead 401 when locking, because the upper half part of the fishing spearhead 401 is a cone and the lower half part is a cylinder, the diameter of the cylinder is smaller than the diameter of the circular bottom surface of the cone, when the fishing spearhead 401 is fully inserted into the inner cavity of the protruding tube, the cone of the upper half part of the fishing spearhead 401 is positioned at the upper parts of the plurality of clips 314, and then each clip 314 is pressed under the action of the elastic lock cylinder 303, so that the plurality of clips 314 are positioned right below the fishing spearhead 401, and the fishing spearhead 401 can be firmly locked.

Furthermore, the outer end face of the clamping piece 314 is fixedly provided with a limiting cap, the limiting cap is a hemisphere, the arc-shaped face of the limiting cap is located on the outer side, and a groove hole matched with the clamping piece 314 and the limiting cap is formed in the protruding pipe. The groove hole matched with the limiting cap is a cylindrical hole, and the length of the cylindrical hole is not less than that of the limiting cap along the radial direction of the protruding pipe, so that the limiting cap can be completely positioned in the cylindrical hole.

In the structure, because the outer side of the limiting cap located on the clamping piece 314 can be extruded with the upper cavity 308, the middle cavity 316 and the inner wall of the lower cavity, and the inner walls can be switched back and forth between the cavities, the arc-shaped surface outside the limiting cap is utilized, the fluency of the back and forth switching between the upper cavity 308, the middle cavity 316 and the lower cavity of the limiting cap can be improved, even if the connecting part between the cavities has a slight height difference during production and manufacturing, the sliding of the limiting cap can not be influenced, and the phenomenon that the clamping piece 314 is blocked when being switched among the upper cavity 308, the middle cavity 316 and the lower cavity can be effectively prevented.

Still further, the area of the plane of the inner side of the limiting cap is larger than the area of the outer end face of the clamping piece 314. The limiting cap is limited when moving inwards, so that the clamping piece 314 cannot slide into the inner cavity of the protruding tube.

Meanwhile, the vertical distance from the inner wall of the permanent magnet 315 to the outer wall of the protruding tube is smaller than the length of the limiting cap in the radial direction of the protruding tube, so that the limiting cap is limited when moving inwards and cannot be completely separated from the cylindrical hole, the clamping piece 314 cannot slide into a gap between the permanent magnet 315 and the protruding tube, and the clamping piece 314 can be limited on the protruding tube and cannot fall off due to the matching of the structure and the structure.

In this embodiment, when the fishing spearhead 401 is locked, the position of the clamping member 314 needs to be adjusted in advance, so that the clamping member 314 is located in the lower cavity, that is, in an unlocked state, and the inner end of the clamping member 314 is not located in the inner cavity of the protruding tube, so that the fishing spearhead 401 can be smoothly inserted into the inner cavity of the protruding tube, and the locking operation can not be smoothly completed due to the blocking of the clamping member 314. The probability of operation errors is increased by the pre-operation performed during each fishing, because a constructor easily forgets to pre-adjust the position of the clamping piece 314 due to tight working time, once the clamping piece 314 is positioned in the upper cavity 308 during the fishing, namely the clamping piece 314 is in a locking state in advance, the fishing spearhead can be severely collided with the clamping piece 314 when entering the inner cavity of the bulge tube, the collision strength is very high, and the damage to other parts such as the bulge tube and the fishing spearhead 401 is easily caused.

In order to solve the above technical problem, in this embodiment, further, the inner side surface of the elastic lock cylinder 303 is provided with grooves 311 corresponding to the respective locking members 314 one to one, the inside of the groove 311 is slidably connected with a push plate 313 through a pressure spring 312, the push plate 313 is an arc-shaped plate, and in a natural state, the inner side surface of the push plate 313 is flush with the inner side surface of the elastic lock cylinder 303. When the push plate 313 is extruded by external force, the pressure spring 312 is compressed outwards, so that the push plate 313 is used outwards, the distance that the push plate 313 can move outwards is not less than the longest length that the clamping piece 314 can be located in the inner cavity of the protruding tube, and when the clamping piece 314 extrudes the push plate 313, the part of the clamping piece 314 located in the inner cavity of the protruding tube can be completely moved out.

In the above, the distance between each two of the plurality of grooves 311 corresponds to the rotation distance of the elastic lock cylinder 303 when the elastic lock cylinder 303 is switched from the unlocking state to the locking state, that is, each groove 311 accurately corresponds to each of the locking members 314 one by one when the elastic lock cylinder 303 is switched to the locking state, so that the technical problem can be solved smoothly. Of course, the shape of the groove 311 and the push plate 313 can also be formed by splicing two semicircular rings, and the two semicircular rings form a complete circular ring, so that the height of the elastic lock cylinder 303 is the same when the elastic lock cylinder 303 is in a locking state no matter how many times the elastic lock cylinder 303 rotates, and each clamping piece 314 corresponds to the groove 311 all the time in the locking state, thereby better solving the technical problem.

Through the structure, when the fishing spearhead 401 is locked and the clamping pieces 314 are forgotten to be adjusted to the unlocking state, the top of the fishing spearhead 401 can extrude the clamping pieces 314 from the bottoms of the clamping pieces 314, the clamping pieces 314 can push the push plate 313 outwards after being extruded to extrude the compression spring 312 and move outwards until the upper half part of the fishing spearhead 401 passes through a circular space surrounded by the clamping pieces 314, so that the situation that the fishing spearhead 401 and the clamping pieces 314 collide violently can not occur, and the technical problem can be effectively solved.

In this case, after the fishing spear 401 is completely inserted into the inner cavity of the protruding tube, the clamping member 314 is automatically in the unlocked state along with the disappearance of the downward pressure of the pressing column 302 on the elastic lock cylinder 303, and at this time, the fisher 3 only needs to be lifted up to separate the fishing spear 401 from the inner cavity of the protruding tube, and then the fisher 3 is moved downward again to reinsert the fishing spear 401 into the inner cavity of the protruding tube, so that the clamping member 314 locks the fishing spear 401.

Further, the clamping member 314 is a cuboid with an oblique angle, the oblique angle of the clamping member 314 is located in the inner cavity of the protruding tube, and the oblique plane of the oblique angle is located at the bottom of the clamping member 314 and inclines upwards towards the axis direction of the protruding tube. Because joint 314 and protruding pipe slip grafting, supply the shape of joint 314 male jack and also be the cuboid on protruding pipe, the outer wall of joint 314 and the inside of this jack are laminated mutually, and this connected mode can carry out other directions spacing to joint 314, and stationarity when increasing joint 314 and removing spearhead 401 is fixed to the steadiness.

When the fishing spearhead 401 is locked, the clamping pieces 314 are in a locked state, the inclined angle of the clamping pieces 314 is designed to enable the fishing spearhead 401 to be inserted into the raised pipe from the bottom, the top of the fishing spearhead 401 collides with the inclined surfaces at the bottom of the clamping pieces 314, friction resistance can be reduced by the design of the inclined surfaces, the fishing spearhead 401 can smoothly press the clamping pieces 314 to move outwards along the radial direction, and impact strength of the fishing spearhead 401 and the clamping pieces 314 when colliding can be effectively reduced.

In this embodiment, the pressing column 302 is connected with the weight 2 through a bolt, the weight 2 includes a body 201, a slot 209 for inserting the top of the pressing column 302 is formed in the bottom of the body 201, the shape of the slot 209 is matched with the shape of the pressing column 302, a first threaded hole 208 communicated with the slot 209 for inserting the bolt is further formed in the body 201, and a through hole for inserting the bolt is formed in the pressing column 302. When the pressing column 302 is inserted into the slot 209 and is abutted against the top of the slot 209, the positions of the first threaded hole 208 and the through hole correspond, and finally, the connection between the pressing column 302 and the body 201 can be completed only by penetrating a bolt through the first threaded hole 208 and the through hole. The other end of the weight part 2 is connected with a rope, and the fishing tool 3 is recovered and lowered by recovering and lowering the weight part 2 through the rope.

The pressure of the pressure applying column 302 can be applied by utilizing the gravity of the weight part 2, the fishing spear 401 can be locked by the fisher 3, when the inner core barrel 4 is fished, high-pressure drilling fluid is not needed to be introduced, the fisher 3 and the weight part 2 can be directly and freely dropped, in the dropping process, the fishing spear 401 firstly enters the inner cavity of the bulge tube until the fisher 3 stops sliding, then the weight part 2 continuously moves downwards under the action of the gravity and applies pressure to the pressure applying column 302 until the weight part 2 moves downwards to the lower limit state, at the moment, the guide rod 310 is moved out from the second sliding groove 307, the elastic lock cylinder 303 rotates into the clamping groove, so that the height of the elastic lock cylinder 303 is reduced, the clamping pieces 314 are separated from the permanent magnet 315, and then the inner walls of the elastic lock cylinder 303 press the clamping pieces 314, so that the fishing spear 401 is locked by the clamping pieces 314. Thereby locking the fishing spearhead 401 by the overshot 3 without the need for high pressure drilling fluid.

Meanwhile, the fishing spearhead 401 can be unlocked by utilizing the gravity of the counterweight 2, when the fishing spearhead 401 is in a locked state, the counterweight 2 is pulled upwards by a small height, then the counterweight 2 is put down to realize the secondary pressure of the counterweight 2 on the pressure applying column 302, then the counterweight 2 is directly pulled upwards again, the pressure applying column 302 is pressed, the elastic lock cylinder 303 is bounced under the action of the spring 309, so that the clamping piece 314 is positioned in the lower cavity of the elastic lock cylinder 303 and is adsorbed by the permanent magnet 315, the fishing spearhead 401 is unlocked, and the counterweight 2 is pulled upwards continuously to be pulled out together with the fisher 3.

Further, the connected mode of counterweight 2 and rope does, and the top spiro union of body 201 has connection lid 202, and the top fixed mounting who connects lid 202 has spliced pole 205, and the top of spliced pole 205 is provided with and supplies rope male rope hole 207, and is provided with the second screw hole 206 that is linked together with rope hole 207 on the spliced pole 205, can accomplish being connected of counterweight 2 and rope through the spiro union bolt of going into in to second screw hole 206.

Further, a plurality of sliding columns 210 arranged at equal intervals in the circumferential direction are inserted and slid on the body 201, sliding holes are formed in the sliding columns 210, the sliding holes penetrate through the inner side surfaces of the sliding columns 210, openings communicated with the sliding holes are formed in the outer side surfaces of the sliding columns 210, balls 211 are arranged in the sliding holes, the diameters of the balls 211 are larger than the diameters of the openings, so that the balls 211 cannot slide out of the openings, push rods 212 are further arranged in the sliding holes in a sliding mode, the push rods 212 and the sliding holes are designed to be cuboid, so that the push rods 212 cannot rotate in the sliding holes, the inner side ends of the push rods 212 are located in a cavity 213 of the body 201, the top surfaces of the push rods 212 located in the cavity 213 are inclined surfaces, a cross rod 204 is arranged above the connecting cover 202, a slot 215 for inserting the cross rod 204 is formed in the bottom of the connecting column 205, the inner wall of the slot 215 is attached to the outer side surface of the cross rod 204, so that the cross rod 204 can stably move up and down along the slot 215, the bottom of the cross bar 204 is fixedly screwed with an extrusion column 214, the extrusion column 214 is positioned on the axial line of the body 201, and the bottom of the extrusion column 214 movably penetrates through the connecting cover 202 and extends downwards to the top of the inclined surface of each push rod 212.

Under the action of the self gravity of the cross rod 204 and the extrusion columns 214, the extrusion columns 214 extrude the inclined surfaces of the push rods 212, so that the push rods 212 move outwards along the radial direction of the body 201, and the push rods 212 push the balls 211 to drive the sliding columns 210 to move outwards together until the balls 211 abut against the inner wall of the drill string 1. The design of this kind of structure can make when weight 2 moves in the inner chamber of drilling string 1, reduces the probability that the inner wall that appears with drilling string 1 bumps, and when 2 horizontal hunting of weight, a plurality of balls 211 can be at first with the inner wall contact of drilling string 1, be rolling contact between the inner wall of ball 211 and drilling string 1, and its frictional force is littleer, and the security is higher, and can not cause the condition of 2 cards of weight in drilling string 1.

Further, in order to improve the downward pressure degree of each push rod 212 by the extrusion columns 214, the weight increasing plate 203 is fixedly mounted at the top of the cross rod 204 through screws, the weight increasing plate 203 is in sliding insertion connection with the connecting columns 205, the stability of the cross rod 204 and the extrusion columns 214 can be further improved through the sliding insertion connection of the weight increasing plate 203 and the connecting columns 205, and the cross rod 204 and the extrusion columns 214 are prevented from shaking.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.