阅读说明：本技术 连续油管旋转引入打捞器和连续油管旋转引入打捞方法 (Coiled tubing rotary introduction fisher and coiled tubing rotary introduction fishing method ) 是由 艾白布·阿不力米提 郝力博 朱召召 侯启太 普宏槟 林国猛 于 2019-10-12 设计创作，主要内容包括：本发明涉及油管打捞技术领域,是一种连续油管旋转引入打捞器和连续油管旋转引入打捞方法,前者包括上接头、转换接头、外筒体、打捞卡瓦、卡瓦座、剪钉、剪切卡瓦、导轨内筒、销钉、导轨外筒和引鞋,上接头下端外侧与转换接头上端内侧固定安装在一起；后者包括步骤如下：(1)将上接头与打捞管柱下端固定安装在一起。本发明结构合理而紧凑,构思巧妙,通过上提下放打捞管柱使销钉在上凹槽和下凹槽间上下移动,使导轨外筒相对导轨内筒旋转,从而使旋转后的引鞋下端与落鱼鱼顶接触的位置不断的发生变化,由此将贴井壁的落鱼鱼顶旋转引入打捞工具内部；通过第二锥孔使下行的打捞卡瓦下端收缩夹紧鱼顶,具有高效、稳定和省时省力的特点。(The invention relates to the technical field of oil pipe fishing, in particular to a coiled oil pipe rotary leading-in fisher and a coiled oil pipe rotary leading-in fishing method, wherein the fisher comprises an upper joint, a conversion joint, an outer cylinder, a fishing slip, a slip seat, a shear pin, a shearing slip, a guide rail inner cylinder, a pin, a guide rail outer cylinder and a guide shoe, and the outer side of the lower end of the upper joint is fixedly installed with the inner side of the upper end of the conversion joint; the latter comprises the following steps: (1) and fixedly mounting the upper joint and the lower end of the fishing pipe column together. The fishing tool is reasonable and compact in structure and ingenious in conception, the pin is enabled to move up and down between the upper groove and the lower groove by lifting and lowering the fishing pipe column, the guide rail outer cylinder is enabled to rotate relative to the guide rail inner cylinder, and therefore the contact position of the lower end of the rotating guide shoe and the fish top of the falling fish is enabled to be changed continuously, and the fish top of the falling fish attached to the well wall is led into the fishing tool in a rotating mode; make descending salvage slips lower extreme shrink through the second taper hole and press from both sides tight fish top, have high efficiency, stable and labour saving and time saving's characteristics.)

1. A rotary leading-in fisher for a continuous oil pipe is characterized by comprising an upper joint, a conversion joint, an outer barrel, a fishing slip, a slip seat, a shear pin, a shearing slip, a guide rail inner barrel, a pin, a guide rail outer barrel and a guide shoe, wherein the outer side of the lower end of the upper joint is fixedly arranged with the inner side of the upper end of the conversion joint, the outer side of the lower end of the conversion joint is fixedly arranged with the inner side of the upper end of the outer barrel, the outer side of the lower end of the outer barrel is fixedly arranged with the inner side of the upper end of the guide rail inner barrel, the guide rail outer barrel is sleeved on the outer side of the lower part of the guide rail inner barrel, a limit ring platform is arranged on the outer side of the upper end of the guide rail inner barrel, the upper end of the guide rail outer barrel abuts against the lower end of the limit ring platform, the, the outer side of the lower end of the guide rail outer cylinder and the inner side of the upper end of the guide shoe are fixedly arranged together, and two V-shaped openings with downward openings are uniformly distributed at the lower end of the guide shoe along the circumference; the middle part of the outer cylinder body is provided with a fishing and cutting channel which is communicated up and down, the fishing and cutting channel comprises a first straight hole, a first taper hole and a second straight hole which are communicated in sequence from top to bottom, and the first taper hole is a taper hole with a large top and a small bottom; a slip seat is fixedly arranged in the first straight hole corresponding to the inner side position of the upper part of the outer barrel through a shear pin, a second through hole which is communicated up and down is arranged in the middle of the slip seat, the second through hole is a taper hole with a big top and a small bottom, a salvaging slip with a lower end seat arranged on the inner side of the upper part of the second through hole is arranged on the inner side of the upper part of the outer barrel, the inner side of the upper part of the salvaging slip can be radially outwards expanded when being subjected to outwards extrusion force, the outer side of the lower part of the salvaging slip can be radially inwards contracted when, a shearing slip with a lower end seat positioned on the inner side of the upper part of the first taper hole is arranged in the first taper hole corresponding to the inner side of the lower part of the outer barrel, the outer side of the lower part of the shearing slip can contract inwards in the radial direction when being subjected to inward extrusion force, shearing teeth are arranged on the inner side of the lower part of the shearing slip, the shearing slip is positioned below the slip seat, and the outer diameter of the upper end of the shearing slip is larger than the inner diameter of the lower end of the slip seat; an upper gear ring is distributed on the outer wall of the inner guide rail cylinder corresponding to the position above the groove type rotary guide track, a lower gear ring is distributed on the outer wall of the inner guide rail cylinder corresponding to the position below the groove type rotary guide track, and the groove type rotary guide track is formed between the upper gear ring and the lower gear ring; the upper ratchet ring comprises upper ratchets which are continuously and uniformly distributed along the circumference and have downward tooth tips, the upper ratchet positioned on the front side comprises an upper slope surface and an upper vertical surface which are high from left to right, and the right end of the upper slope surface is connected with the lower end of the upper vertical surface adjacent to the upper slope surface to form the tooth tips of the upper ratchet; the lower gear ring comprises lower ratchets which are continuously and uniformly distributed along the circumference and have upward tooth tips, the lower ratchets positioned on the front side comprise a lower slope surface which is low at the left and high at the right and a lower vertical surface, and the right end of the lower slope surface is connected with the upper end of the lower vertical surface adjacent to the lower slope surface to form the tooth tips of the lower ratchets; the upper ratchets and the lower ratchets are distributed in a staggered mode, the tooth tips of the lower ratchets are located in the middle of the corresponding upper slope, and the tooth tips of the upper ratchets are located in the middle of the corresponding lower slope.

2. The coiled tubing rotary leading-in fisher according to claim 1, wherein an upper groove is arranged between every two adjacent upper ratchets, the left side and the right side of each upper groove are vertical surfaces, the bottom end of the left side surface of each upper groove is connected with the top end of the corresponding upper vertical surface, and the bottom end of the right side surface of each upper groove is connected with the top end of the corresponding upper slope surface; all be equipped with the low groove between per two adjacent lower ratchet, the left and right sides of low groove is vertical face, and the left surface top of low groove links together with lower facade bottom, and the right flank top of low groove links together with the bottom of domatic down.

3. The coiled tubing rotary leading-in fisher according to claim 1 or 2, wherein the fishing slip comprises a conical cylinder and a straight cylinder, the conical cylinder is in a hollow circular platform shape with a small upper part and a big lower part, the straight cylinder is in a hollow cylindrical shape, the lower end of the conical cylinder and the upper end of the straight cylinder are fixedly installed together, at least three upper long openings with the lower ends located at the upper part of the straight cylinder are evenly distributed at the upper end of the fishing slip along the circumference, and lower long openings with the upper ends located at the lower part of the conical cylinder are arranged at the lower ends of the fishing slip corresponding to the position between every two adjacent upper long openings.

4. The coiled tubing rotary induction fisher according to claim 1 or 2, wherein the shear slip is hollow cylindrical, and the lower end of the shear slip is uniformly provided with at least three strip gaps of which the upper ends are positioned in the middle of the shear slip along the circumference.

5. The coiled tubing rotary induction fisher according to claim 3, wherein the shear slip is hollow cylindrical, and the lower end of the shear slip is uniformly provided with at least three strip openings with the upper ends positioned in the middle of the shear slip along the circumference.

6. The coiled tubing rotary leading-in fisher according to claim 1, 2 or 5, wherein the outer side of the lower end of the upper joint and the inner side of the upper end of the adapter are fixedly installed together through threaded connection, the outer side of the lower end of the adapter and the inner side of the upper end of the outer cylinder are fixedly installed together through threaded connection, the outer side of the lower end of the outer cylinder and the inner side of the upper end of the guide rail inner cylinder are fixedly installed together through threaded connection, and the outer side of the lower end of the guide rail outer cylinder and the inner side of the upper end of.

7. The coiled tubing rotary leading-in fisher according to claim 3, wherein the outer side of the lower end of the upper joint and the inner side of the upper end of the adapter are fixedly installed together through threaded connection, the outer side of the lower end of the adapter and the inner side of the upper end of the outer cylinder are fixedly installed together through threaded connection, the outer side of the lower end of the outer cylinder and the inner side of the upper end of the guide rail inner cylinder are fixedly installed together through threaded connection, and the outer side of the lower end of the guide rail outer cylinder and the inner side of the upper end of.

8. The coiled tubing rotary leading-in fisher according to claim 4, wherein the outer side of the lower end of the upper joint and the inner side of the upper end of the adapter are fixedly installed together through threaded connection, the outer side of the lower end of the adapter and the inner side of the upper end of the outer cylinder are fixedly installed together through threaded connection, the outer side of the lower end of the outer cylinder and the inner side of the upper end of the guide rail inner cylinder are fixedly installed together through threaded connection, and the outer side of the lower end of the guide rail outer cylinder and the inner side of the upper end of.

9. A coiled tubing rotary induction fishing method using the coiled tubing rotary induction overshot of any one of claims 1 to 8, characterized by comprising the steps of:

(1) the upper joint and the lower end of the fishing pipe column are fixedly installed together, the pin is positioned between two adjacent upper ratchets in an initial state, the fishing pipe column is lowered to start fishing operation, in the lowering process, the pin moves between the two adjacent lower ratchets along the upper vertical surface and the down slope surface on the corresponding position under the action of the guide rail outer cylinder and the gravity of the guide shoe, and in the process, the guide rail outer cylinder rotates relative to the guide rail inner cylinder, so that the fishing operation is started;

(2) after the guide shoe contacts the fish top, the fishing pipe column is continuously lowered under the action of upward supporting force generated by the fish top, the pin between the two adjacent lower ratchets moves to the two adjacent upper ratchets along the lower vertical surface and the upper slope surface at the corresponding position, the guide rail outer cylinder rotates relative to the guide rail inner cylinder in the process, so that the guide shoe rotates along with the guide rail outer cylinder, and the fish top is guided into the guide shoe;

(3) if the top of the fish cannot be led into the guide shoe due to the fact that the underground fish falls close to the well wall, the fishing pipe column is continuously lifted, after the lower end of the guide shoe loses the effect of upward supporting force generated by the top of the fish, the pin moves between two adjacent lower ratchets along the upper vertical surface and the lower slope surface at the corresponding position under the action of the gravity of the guide rail outer cylinder and the guide shoe, and the guide rail outer cylinder rotates relative to the guide rail inner cylinder in the process;

(4) after the guide shoe contacts the fish top again, the fishing pipe column is continuously lowered under the action of upward supporting force generated by the fish top, the pin between the two adjacent lower ratchets moves to the two adjacent upper ratchets along the lower vertical surface and the upper slope surface at the corresponding position, and the guide rail outer cylinder rotates relative to the guide rail inner cylinder in the process;

(5) because the guide shoe is provided with two V-shaped openings with downward openings, the contact positions of the guide shoe and the upper end of the fish after rotating every time are different, and therefore, the top of the fish with the adherent fish can be introduced into the guide shoe through lifting and lowering the fishing pipe column for many times;

(6) after the fish top is introduced into the guide shoe, the fishing pipe column is lowered down, so that the fish top sequentially passes through the guide rail outer cylinder, the guide rail inner cylinder, the outer cylinder, the shearing slip, the slip seat and the fishing slip;

(7) at the moment, the fishing pipe column is continuously lowered, the fish top continuously moves upwards, and when the fish top contacts the inner side of the upper end of the fishing slip and generates outward extrusion force on the fishing slip, the upper end of the fishing slip is radially expanded outwards;

(8) the fishing slip is characterized in that the elastic force of the upper end of the fishing slip is used for gripping the fish to provide initial pre-tightening force, under the action of the pre-tightening force, the fishing pipe column is lifted, the upper end of the fishing slip grips the outer wall of the fish and moves downwards relative to the outer barrel, in the process of downward movement of the fishing slip, the lower end of the fishing slip is extruded by the conical surface of the second taper hole and then contracts inwards, the annular slip teeth at the lower part of the fishing slip grip the outer wall of the fish, and the fishing pipe column is continuously lifted to finish the fishing operation;

(9) if the coiled tubing is clamped underground and the fishing pipe column cannot be lifted, continuing to lower the fishing pipe column until the target position needing to be cut by shearing, namely the stuck point position;

(10) after reaching the clamping point, lifting the fishing pipe column, enabling the annular slip teeth at the lower part of the fishing slip to bite the outer wall of the fish again, continuing to lift the fishing pipe column at the moment, and further increasing the lifting load;

(11) when the downward stress of the slip bowl reaches the shearing force of the shearing nail, the shearing nail is sheared, the slip bowl continues to push the shearing slip downwards at the moment, the lower end of the shearing slip is extruded by the conical surface of the first conical hole and then contracts inwards, and the shearing teeth act on the outer wall of the coiled tubing to be salvaged;

(12) and continuously lifting the fishing pipe column to increase the lifting load until the coiled tubing to be fished is cut off, thereby completing the fishing operation of the coiled tubing to be fished.

Technical Field

The invention relates to the technical field of oil pipe fishing, in particular to a coiled tubing rotary leading-in fisher and a coiled tubing rotary leading-in fishing method.

Background

Along with popularization and application of the coiled tubing in the field of oil and gas downhole operation, the coiled tubing is applied more on an oil and gas field, and meanwhile, more and more coiled tubing are broken and then clamped in a well and other downhole complex conditions occur. Because tools and operation experience for processing complex conditions such as coiled tubing unfreezing and fishing are few in the current operation field, the tools and the method are limited in the complex condition processing, the processing is passive, the success rate is low, and the use is unstable.

Disclosure of Invention

The invention provides a coiled tubing rotary leading-in fisher and a coiled tubing rotary leading-in fishing method, overcomes the defects of the prior art, and can effectively solve the problem that the existing guide shoe cannot lead fish close to a well wall into the guide shoe.

One of the technical schemes of the invention is realized by the following measures: a rotary leading-in fisher for a continuous oil pipe comprises an upper joint, a conversion joint, an outer cylinder body, a fishing slip, a slip seat, a shear pin, a shearing slip, a guide rail inner cylinder, a pin, a guide rail outer cylinder and a guide shoe, wherein the outer side of the lower end of the upper joint is fixedly installed with the inner side of the upper end of the conversion joint, the outer side of the lower end of the conversion joint is fixedly installed with the inner side of the upper end of the outer cylinder body, the outer side of the lower end of the outer cylinder body is fixedly installed with the inner side of the upper end of the guide rail inner cylinder, the guide rail outer cylinder is sleeved on the outer side of the lower part of the guide rail inner cylinder, a limit ring platform is arranged on the outer side of the upper end of the guide rail inner cylinder, the guide rail inner cylinder and the guide rail outer cylinder are installed together in a limiting, the outer side of the lower end of the guide rail outer cylinder and the inner side of the upper end of the guide shoe are fixedly arranged together, and two V-shaped openings with downward openings are uniformly distributed at the lower end of the guide shoe along the circumference; the middle part of the outer cylinder body is provided with a fishing and cutting channel which is communicated up and down, the fishing and cutting channel comprises a first straight hole, a first taper hole and a second straight hole which are communicated in sequence from top to bottom, and the first taper hole is a taper hole with a large top and a small bottom; a slip seat is fixedly arranged in the first straight hole corresponding to the inner side position of the upper part of the outer barrel through a shear pin, a second through hole which is communicated up and down is arranged in the middle of the slip seat, the second through hole is a taper hole with a big top and a small bottom, a salvaging slip with a lower end seat arranged on the inner side of the upper part of the second through hole is arranged on the inner side of the upper part of the outer barrel, the inner side of the upper part of the salvaging slip can be radially outwards expanded when being subjected to outwards extrusion force, the outer side of the lower part of the salvaging slip can be radially inwards contracted when, a shearing slip with a lower end seat positioned on the inner side of the upper part of the first taper hole is arranged in the first taper hole corresponding to the inner side of the lower part of the outer barrel, the outer side of the lower part of the shearing slip can contract inwards in the radial direction when being subjected to inward extrusion force, shearing teeth are arranged on the inner side of the lower part of the shearing slip, the shearing slip is positioned below the slip seat, and the outer diameter of the upper end of the shearing slip is larger than the inner diameter of the lower end of the slip seat; the outer wall of the guide rail inner cylinder corresponding to the upper position of the groove type rotary guide rail can be distributed with an upper gear ring, the outer wall of the guide rail inner cylinder corresponding to the lower position of the groove type rotary guide rail can be distributed with a lower gear ring, and a groove type rotary guide rail is formed between the upper gear ring and the lower gear ring; the upper ratchet ring comprises upper ratchets which are continuously and uniformly distributed along the circumference and have downward tooth tips, the upper ratchet positioned on the front side comprises an upper slope surface and an upper vertical surface which are high from left to right, and the right end of the upper slope surface is connected with the lower end of the upper vertical surface adjacent to the upper slope surface to form the tooth tips of the upper ratchet; the lower gear ring comprises lower ratchets which are continuously and uniformly distributed along the circumference and have upward tooth tips, the lower ratchets positioned on the front side comprise a lower slope surface which is low at the left and high at the right and a lower vertical surface, and the right end of the lower slope surface is connected with the upper end of the lower vertical surface adjacent to the lower slope surface to form the tooth tips of the lower ratchets; the upper ratchets and the lower ratchets are distributed in a staggered mode, the tooth tips of the lower ratchets are located in the middle of the corresponding upper slope, and the tooth tips of the upper ratchets are located in the middle of the corresponding lower slope.

The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:

an upper groove can be arranged between every two adjacent upper ratchets, the left side and the right side of each upper groove are vertical surfaces, the bottom end of the left side surface of each upper groove is connected with the top end of the corresponding upper vertical surface, and the bottom end of the right side surface of each upper groove is connected with the top end of the corresponding upper slope surface; the lower grooves can be arranged between every two adjacent lower ratchets, the left side and the right side of each lower groove are vertical surfaces, the top ends of the left side surfaces of the lower grooves are connected with the bottom ends of the lower vertical surfaces, and the top ends of the right side surfaces of the lower grooves are connected with the bottom ends of the lower slope surfaces.

The salvaging slips can comprise a conical cylinder and a straight cylinder, the conical cylinder is in a hollow round platform shape with a small upper part and a large lower part, the straight cylinder is in a hollow cylindrical shape, the lower end of the conical cylinder and the upper end of the straight cylinder are fixedly installed together, the upper end of the salvaging slips is evenly provided with at least three upper long openings with lower ends positioned on the upper part of the straight cylinder along the circumference, and the lower end of the salvaging slips corresponding to the position between every two adjacent upper long openings is provided with a lower long opening with upper ends positioned on the lower part of the conical cylinder.

The shearing slips can be hollow cylindrical, and the lower end of the shearing slips is evenly provided with at least three strip openings with the upper ends positioned in the middle of the shearing slips along the circumference.

The outer side of the lower end of the upper joint can be fixedly installed together with the inner side of the upper end of the adapter through threaded connection, the outer side of the lower end of the adapter can be fixedly installed together with the inner side of the upper end of the outer cylinder through threaded connection, the outer side of the lower end of the outer cylinder can be fixedly installed together with the inner side of the upper end of the guide rail inner cylinder through threaded connection, and the outer side of the lower end of the guide rail outer cylinder can be fixedly installed together with the inner side of.

The second technical scheme of the invention is realized by the following measures: a coiled tubing rotary leading-in fishing method using the coiled tubing rotary leading-in fisher comprises the following steps:

(1) the upper joint and the lower end of the fishing pipe column are fixedly installed together, the pin is positioned between two adjacent upper ratchets in an initial state, the fishing pipe column is lowered to start fishing operation, in the lowering process, the pin moves between the two adjacent lower ratchets along the upper vertical surface and the down slope surface on the corresponding position under the action of the guide rail outer cylinder and the gravity of the guide shoe, and in the process, the guide rail outer cylinder rotates relative to the guide rail inner cylinder, so that the fishing operation is started;

(2) after the guide shoe contacts the fish top, the fishing pipe column is continuously lowered under the action of upward supporting force generated by the fish top, the pin between the two adjacent lower ratchets moves to the two adjacent upper ratchets along the lower vertical surface and the upper slope surface at the corresponding position, the guide rail outer cylinder rotates relative to the guide rail inner cylinder in the process, so that the guide shoe rotates along with the guide rail outer cylinder, and the fish top is guided into the guide shoe;

(3) if the top of the fish cannot be led into the guide shoe due to the fact that the underground fish falls close to the well wall, the fishing pipe column is continuously lifted, after the lower end of the guide shoe loses the effect of upward supporting force generated by the top of the fish, the pin moves between two adjacent lower ratchets along the upper vertical surface and the lower slope surface at the corresponding position under the action of the gravity of the guide rail outer cylinder and the guide shoe, and the guide rail outer cylinder rotates relative to the guide rail inner cylinder in the process;

(4) after the guide shoe contacts the fish top again, the fishing pipe column is continuously lowered under the action of upward supporting force generated by the fish top, the pin between the two adjacent lower ratchets moves to the two adjacent upper ratchets along the lower vertical surface and the upper slope surface at the corresponding position, and the guide rail outer cylinder rotates relative to the guide rail inner cylinder in the process;

(5) because the guide shoe is provided with two V-shaped openings with downward openings, the contact positions of the guide shoe and the upper end of the fish after rotating every time are different, and therefore, the top of the fish with the adherent fish can be introduced into the guide shoe through lifting and lowering the fishing pipe column for many times;

(6) after the fish top is introduced into the guide shoe, the fishing pipe column is lowered down, so that the fish top sequentially passes through the guide rail outer cylinder, the guide rail inner cylinder, the outer cylinder, the shearing slip, the slip seat and the fishing slip;

(7) at the moment, the fishing pipe column is continuously lowered, the fish top continuously moves upwards, and when the fish top contacts the inner side of the upper end of the fishing slip and generates outward extrusion force on the fishing slip, the upper end of the fishing slip is radially expanded outwards;

(8) the fishing slip is characterized in that the elastic force of the upper end of the fishing slip is used for gripping the fish to provide initial pre-tightening force, under the action of the pre-tightening force, the fishing pipe column is lifted, the upper end of the fishing slip grips the outer wall of the fish and moves downwards relative to the outer barrel, in the process of downward movement of the fishing slip, the lower end of the fishing slip is extruded by the conical surface of the second taper hole and then contracts inwards, the annular slip teeth at the lower part of the fishing slip grip the outer wall of the fish, and the fishing pipe column is continuously lifted to finish the fishing operation;

(9) if the coiled tubing is clamped underground and the fishing pipe column cannot be lifted, continuing to lower the fishing pipe column until the target position needing to be cut by shearing, namely the stuck point position;

(10) after reaching the clamping point, lifting the fishing pipe column, enabling the annular slip teeth at the lower part of the fishing slip to bite the outer wall of the fish again, continuing to lift the fishing pipe column at the moment, and further increasing the lifting load;

(11) when the downward stress of the slip bowl reaches the shearing force of the shearing nail, the shearing nail is sheared, the slip bowl continues to push the shearing slip downwards at the moment, the lower end of the shearing slip is extruded by the conical surface of the first conical hole and then contracts inwards, and the shearing teeth act on the outer wall of the coiled tubing to be salvaged;

(12) and continuously lifting the fishing pipe column to increase the lifting load until the coiled tubing to be fished is cut off, thereby completing the fishing operation of the coiled tubing to be fished.

The fishing tool is reasonable and compact in structure and ingenious in conception, the pin is enabled to move up and down between the upper groove and the lower groove by lifting and lowering the fishing pipe column, the guide rail outer cylinder is enabled to rotate relative to the guide rail inner cylinder, and therefore the contact position of the lower end of the rotating guide shoe and the fish top of the falling fish is enabled to be changed continuously, and the fish top of the falling fish attached to the well wall is led into the fishing tool in a rotating mode; the lower end of the descending fishing slip is contracted to clamp the fish top through the second taper hole; the coiled tubing is salvaged through the salvage slips, and the lower end of the descending shear slip is contracted through the first taper hole to clamp the coiled tubing to be salvaged; the clamped coiled tubing is sheared through the shearing slips, and the shearing slips have the advantages of being efficient, stable, time-saving and labor-saving.

Drawings

FIG. 1 is a schematic sectional view of the preferred embodiment of the present invention.

Fig. 2 is an expanded and enlarged structural schematic diagram of the guide rail inner cylinder in fig. 1.

Fig. 3 is a schematic view of the guide shoe of fig. 1.

The codes in the figures are respectively: the device comprises an upper joint 1, a conversion joint 2, an outer cylinder 3, a fishing slip 4, a slip seat 5, a shear pin 6, a shear slip 7, a guide rail inner cylinder 8, a lower groove 9, a pin 10, a guide rail outer cylinder 11, a guide shoe 12, a limit ring table 13, a V-shaped opening 14, a first taper hole 15, a second taper hole 16, a groove type rotary guide rail 17, an upper ratchet 18, an upper slope surface 19, an upper elevation surface 20, a lower ratchet 21, a lower slope surface 22, a lower elevation surface 23 and an upper groove 24.

Detailed Description

The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.

In the present invention, for convenience of description, the description of the relative positional relationship of the components is described according to the layout pattern of fig. 1 of the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.

The invention is further described with reference to the following examples and figures:

as shown in attached figures 1, 2 and 3, the rotary leading-in fisher for the coiled tubing comprises an upper joint 1, a conversion joint 2, an outer cylinder 3, a fishing slip 4, a slip seat 5, a shear pin 6, a shear slip 7, a guide rail inner cylinder 8, a pin 10, a guide rail outer cylinder 11 and a guide shoe 12, wherein the outer side of the lower end of the upper joint 1 is fixedly arranged with the inner side of the upper end of the conversion joint 2, the outer side of the lower end of the conversion joint 2 is fixedly arranged with the inner side of the upper end of the outer cylinder 3, the outer side of the lower end of the outer cylinder 3 is fixedly arranged with the inner side of the upper end of the guide rail inner cylinder 8, the guide rail outer cylinder 11 is sleeved on the outer side of the lower part of the guide rail inner cylinder 8, a limit ring platform 13 is arranged on the outer side of the upper end of the guide rail outer cylinder 8, the guide rail inner cylinder 8 and the guide rail outer, at least two pins 10 with the inner ends clamped into the groove type rotary guide rails 17 are fixedly arranged on the guide rail outer cylinder 11, the outer side of the lower end of the guide rail outer cylinder 11 is fixedly arranged with the inner side of the upper end of the guide shoe 12, and two V-shaped openings 14 with downward openings are uniformly distributed at the lower end of the guide shoe 12 along the circumference; the middle part of the outer cylinder body 3 is provided with a fishing and cutting channel which is communicated up and down, the fishing and cutting channel comprises a first straight hole, a first taper hole 15 and a second straight hole which are communicated in sequence from top to bottom, and the first taper hole 15 is a taper hole with a large top and a small bottom; a slip seat 5 is fixedly arranged in a first straight hole corresponding to the inner side position of the upper part of the outer barrel 3 through a shear pin 6, a second taper hole 16 which is communicated up and down is arranged in the middle of the slip seat 5, the second taper hole 16 is a taper hole with a big top and a small bottom, a fishing slip 4 with a lower end seat at the inner side of the upper part of the second taper hole 16 is arranged at the inner side of the upper part of the outer barrel 3, the inner side of the upper part of the fishing slip 4 can radially expand outwards when being extruded outwards, the outer side of the lower part of the fishing slip 4 can radially contract inwards when being extruded inwards, an annular slip tooth is arranged at the inner side of the fishing slip 4, a shear slip 7 with a lower end seat at the inner side of the upper part of the first taper hole 15 is arranged in a first taper hole 15 corresponding to the inner side position of the lower part of the outer barrel 3, the outer side of the lower part of the shear slip, the outer diameter of the upper end of the shearing slip 7 is larger than the inner diameter of the lower end of the slip seat 5; an upper gear ring is distributed on the outer wall of the guide rail inner cylinder 8 corresponding to the position above the groove type rotary guide rail 17, a lower gear ring is distributed on the outer wall of the guide rail inner cylinder 8 corresponding to the position below the groove type rotary guide rail 17, and the groove type rotary guide rail 17 is formed between the upper gear ring and the lower gear ring; the upper gear ring comprises upper ratchets 18 which are continuously and uniformly distributed along the circumference and have downward tooth tips, the upper ratchets 18 positioned on the front side comprise an upper slope surface 19 which is high at the left and low at the right and an upper vertical surface 20, and the right end of the upper slope surface 19 is connected with the lower end of the upper vertical surface 20 adjacent to the upper slope surface to form the tooth tips of the upper ratchets 18; the lower gear ring comprises lower ratchets 21 which are continuously and uniformly distributed along the circumference and have upward tooth tips, the lower ratchets 21 positioned on the front side comprise a lower slope surface 22 which is low on the left and high on the right and a lower vertical surface 23, and the right end of the lower slope surface 22 is connected with the upper end of the lower vertical surface 23 adjacent to the right and forms the tooth tips of the lower ratchets 21; the upper ratchets 18 and the lower ratchets 21 are distributed in a staggered manner, the tooth tips of each lower ratchet 21 are positioned in the middle of the corresponding upper sloping surface 19, and the tooth tips of each upper ratchet 18 are positioned in the middle of the corresponding lower sloping surface 22.

According to requirements, the fishing slip 4 is a known technology, the upper part and the lower part of the fishing slip 4 are of split elastic structures, the inner side of the lower part of the fishing slip 4 is provided with an annular slip insert, the inner side of the upper part of the fishing slip 4 can be radially outwards expanded when being subjected to outwards extrusion force, and the outer side of the lower part of the fishing slip 4 can be radially inwards contracted when being subjected to inwards extrusion force; the shearing slip 7 is a well-known technology, the lower part of the shearing slip 7 is of a split elastic structure, the inner side of the lower part of the shearing slip 7 is provided with shearing teeth, and the outer side of the lower part of the shearing slip 7 can contract inwards in the radial direction when being subjected to inward extrusion force. In the using process, when the fallen fish in the well is close to the well wall and is inconvenient to salvage, the fishing rod is connected to the lower end of the existing well-known fishing rod column and is fixedly installed with the lower end of the fishing rod column through the upper connector 1, in the initial state, the pin 10 is positioned between two adjacent upper ratchets 18, then the fishing rod column is lowered to start salvage operation, in the lowering process, the pin 10 moves to the position between two adjacent lower ratchets 21 along the upper vertical surface 20 and the lower sloping surface 22 on the corresponding position under the action of the gravity of the guide rail outer cylinder 11 and the guide shoe 12, and in the process, the guide rail outer cylinder 11 rotates relative to the guide rail inner cylinder 8, so that; firstly, after the guide shoe 12 contacts the fish top, the fishing pipe column is continuously lowered under the action of upward supporting force generated by the fish top, the pin 10 positioned between two adjacent lower ratchets 21 moves to the position between the two adjacent upper ratchets 18 along the lower vertical surface 23 and the upper sloping surface 19 on the corresponding position, in the process, the guide rail outer cylinder 11 rotates relative to the guide rail inner cylinder 8, so that the guide shoe 12 rotates along with the guide rail outer cylinder 11, and the fish top is guided into the guide shoe 12; if the top of the fish cannot be led into the guide shoe 12 due to the fact that the underground falling fish is close to the well wall, the fishing pipe column is continuously lifted, after the lower end of the guide shoe 12 loses the effect of upward supporting force generated by the top of the fish, the pin 10 moves towards two adjacent lower ratchets 21 along an upper vertical surface 20 and a lower sloping surface 22 on corresponding positions under the action of the gravity of the guide rail outer cylinder 11 and the guide shoe 12, the guide rail outer cylinder 11 rotates relative to the guide rail inner cylinder 8 in the process, after the guide shoe 12 contacts the top of the fish again, the fishing pipe column is continuously lowered under the effect of upward supporting force generated by the top of the fish, the pin 10 between the two adjacent lower ratchets 21 moves towards two adjacent upper ratchets 18 along a lower vertical surface 23 and an upper sloping surface 19 on corresponding positions, and the guide rail outer cylinder 11 rotates relative; because the guide shoe 12 is provided with the two V-shaped openings 14 with downward openings, the contact positions of the guide shoe 12 and the upper end of the fish after each rotation are different, and therefore, the top of the fish with the wall attached can be introduced into the guide shoe 12 through lifting and lowering the fishing pipe column for many times; then, after the guide shoe 12 is introduced into the fish top, the fishing pipe column is lowered down, so that the fish top sequentially passes through the guide rail outer cylinder 11, the guide rail inner cylinder 8, the outer cylinder 3, the shearing slip 7, the slip seat 5 and the fishing slip 4, at this time, the fishing pipe column is continuously lowered down, the fish top continuously goes upward, when the top of the fish contacts the inner side of the upper end of the fishing slip 4 to generate outward extrusion force to the fishing slip 4, the upper end of the fishing slip 4 expands outwards in the radial direction, the falling fish is gripped by the self elastic force of the upper end of the fishing slip 4 to provide initial pretightening force, under the action of the pre-tightening force, the fishing pipe column is lifted, the upper end of the fishing slip 4 grasps the outer wall of the fish and moves downwards relative to the outer cylinder 3, in the process that the fishing slip 4 moves downwards, the lower end of the fishing slip 4 is squeezed by the conical surface of the second taper hole 16 and then contracts inwards, the outer wall of the fish is tightly gripped by the annular slip teeth at the lower part of the fishing slip 4, and the fishing pipe column is continuously lifted to finish the fishing operation of the continuous oil pipe; finally, if the coiled tubing is stuck in the well and the fishing pipe column can not be lifted, the fishing pipe column is continuously lowered until the target position needing to be cut, namely the position of the clamping point, the fishing pipe column is lifted, so that the annular slip teeth at the lower part of the fishing slip 4 bite the outer wall of the fallen fish again, at the moment, the fishing pipe column is continuously lifted, the lifting load is further increased, when the slip seat 5 is stressed downwards to reach the shearing force of the shearing nail 6, the shearing nail 6 is sheared, the slip seat 5 continues to push the shearing slip 7 downwards to move, the lower end of the shearing slip 7 is extruded by the conical surface of the first conical hole 15 and then contracts inwards, the shearing teeth act on the outer wall of the coiled tubing to be salvaged, the shearing force of the shearing teeth is in direct proportion to the lifting load, the fishing pipe column is continuously lifted to increase the lifting load until the coiled tubing to be salvaged is sheared, and therefore fishing operation of the coiled tubing to be fished is completed.

The rotary leading-in fisher of the coiled tubing can be further optimized or/and improved according to actual needs:

as shown in fig. 1, 2 and 3, an upper groove 24 is arranged between every two adjacent upper ratchets 18, the left side and the right side of each upper groove 24 are vertical surfaces, the bottom end of the left side surface of each upper groove 24 is connected with the top end of the corresponding upper vertical surface 20, and the bottom end of the right side surface of each upper groove 24 is connected with the top end of the corresponding upper slope surface 19; the lower grooves 9 are arranged between every two adjacent lower ratchets 21, the left side and the right side of each lower groove 9 are vertical surfaces, the top ends of the left side surfaces of the lower grooves 9 are connected with the bottom ends of the lower vertical surfaces 23, and the top ends of the right side surfaces of the lower grooves 9 are connected with the bottom ends of the downhill surfaces 22. In use, the arrangement can enable the pin 10 to be better matched with the groove type rotary guide track 17, and the pin 10 is effectively prevented from being reversed. The upper groove 24 and the lower groove 9 may be tangent to the pin 10 on both left and right sides, as desired.

As shown in the attached figures 1, 2 and 3, the salvaging slips 4 comprises a conical cylinder and a straight cylinder, the conical cylinder is in a hollow round platform shape with a small upper part and a big lower part, the straight cylinder is in a hollow cylindrical shape, the lower end of the conical cylinder is fixedly installed with the upper end of the straight cylinder, the upper end of the salvaging slips 4 is uniformly provided with at least three upper long openings with the lower ends positioned on the upper part of the straight cylinder along the circumference, and the lower end of the salvaging slips 4 corresponding to the position between every two adjacent upper long openings is provided with a lower long opening with the upper end positioned on the lower part of the. In the using process, the upper part of the salvaging slips 4 forms a plurality of split elastic structures by arranging the upper long opening on the conical cylinder, so that the inner side of the upper part of the salvaging slips 4 can be radially expanded outwards when being subjected to outwards extrusion force; the lower part of the salvaging slips 4 forms a plurality of split elastic structures by arranging the lower long opening on the straight column barrel, so that the outer side of the lower part of the salvaging slips 4 can radially contract inwards when being subjected to inward extrusion force; thereby completing the fishing operation of the coiled tubing through the annular slip teeth on the inner side of the fishing slip 4.

As shown in attached figures 1, 2 and 3, the shearing slip 7 is hollow cylindrical, and at least three strip openings with upper ends located in the middle of the shearing slip 7 are uniformly distributed at the lower end of the shearing slip 7 along the circumference. In the using process, the lower part of the shearing slip 7 forms a plurality of split elastic structures by arranging the strip openings on the shearing slip 7, so that the outer side of the lower part of the shearing slip 7 can contract inwards in the radial direction when being subjected to inwards extrusion force; thereby completing the shearing operation of the coiled tubing by shearing the shearing teeth inside the slips 7.

As shown in the attached drawings 1, 2 and 3, the outer side of the lower end of the upper joint 1 is fixedly connected with the inner side of the upper end of the adapter 2 through threads, the outer side of the lower end of the adapter 2 is fixedly connected with the inner side of the upper end of the outer cylinder 3 through threads, the outer side of the lower end of the outer cylinder 3 is fixedly connected with the inner side of the upper end of the guide rail inner cylinder 8 through threads, and the outer side of the lower end of the guide rail outer cylinder 11 is fixedly connected with the inner side of the upper end of the guide. The arrangement facilitates the disassembly and assembly of the components of the invention during use.

As shown in fig. 1, 2 and 3, a coiled tubing rotary-induction fishing method using the coiled tubing rotary-induction fisher comprises the following steps:

(1) the upper joint 1 and the lower end of a fishing pipe column are fixedly installed together, a pin 10 is positioned between two adjacent upper ratchets 18 in an initial state, the fishing pipe column is lowered to start fishing operation, in the lowering process, the pin 10 moves towards two adjacent lower ratchets 21 along an upper vertical surface 20 and a lower slope surface 22 on corresponding positions under the action of the gravity of a guide rail outer cylinder 11 and a guide shoe 12, and in the process, the guide rail outer cylinder 11 rotates relative to a guide rail inner cylinder 8, so that the fishing operation is started;

(2) after the guide shoe 12 contacts the fish top, the fishing pipe column is continuously lowered under the action of upward supporting force generated by the fish top, the pin 10 positioned between two adjacent lower ratchets 21 moves towards the space between two adjacent upper ratchets 18 along the lower vertical surface 23 and the upper sloping surface 19 on the corresponding positions, the guide rail outer cylinder 11 is rotated relative to the guide rail inner cylinder 8 in the process, so that the guide shoe 12 rotates along with the guide rail outer cylinder 11, and the fish top is guided into the guide shoe 12;

(3) if the top of the fish cannot be led into the guide shoe 12 due to the fact that the underground falling fish is close to the well wall, the fishing pipe column is continuously lifted, after the lower end of the guide shoe 12 loses the effect of upward supporting force generated by the top of the fish, the pin 10 moves to the position between two adjacent lower ratchets 21 along the upper vertical surface 20 and the lower sloping surface 22 on the corresponding position under the action of the gravity of the guide rail outer cylinder 11 and the guide shoe 12, and the guide rail outer cylinder 11 rotates relative to the guide rail inner cylinder 8 in the process;

(4) after the guide shoe 12 contacts the fish top again, the fishing pipe column is continuously lowered under the action of upward supporting force generated by the fish top, the pin 10 positioned between two adjacent lower ratchets 21 moves to the position between two adjacent upper ratchets 18 along the lower vertical surface 23 and the upper sloping surface 19 at the corresponding positions, and the guide rail outer cylinder 11 is rotated relative to the guide rail inner cylinder 8 in the process;

(5) because the guide shoe 12 is provided with the two V-shaped openings 14 with downward openings, the contact positions of the guide shoe 12 and the upper end of the fish after each rotation are different, and therefore, the top of the fish with the wall attached can be introduced into the guide shoe 12 through lifting and lowering the fishing pipe column for many times;

(6) after the guide shoe 12 is introduced into the fish top, the fishing pipe column is lowered down, so that the fish top sequentially passes through the guide rail outer cylinder 11, the guide rail inner cylinder 8, the outer cylinder 3, the shearing slips 7, the slip seat 5 and the fishing slips 4;

(7) at the moment, the fishing pipe column is continuously lowered, the fish top continuously moves upwards, and when the fish top contacts the inner side of the upper end of the fishing slip 4 and generates outward extrusion force on the fishing slip, the upper end of the fishing slip 4 is radially expanded outwards;

(8) the fishing pipe column is lifted under the action of the pre-tightening force, the upper end of the fishing slip 4 grips the outer wall of the fish and moves downwards relative to the outer barrel 3, in the process that the fishing slip 4 moves downwards, the lower end of the fishing slip 4 is squeezed by the conical surface of the second taper hole 16 and then contracts inwards, the outer wall of the fish is gripped by the annular slip teeth at the lower part of the fishing slip 4, and the fishing pipe column is continuously lifted to finish the fishing operation of the continuous oil pipe;

(9) if the coiled tubing is clamped underground and the fishing pipe column cannot be lifted, continuing to lower the fishing pipe column until the target position needing to be cut by shearing, namely the stuck point position;

(10) after reaching the clamping point, lifting the fishing pipe column, enabling the annular slip teeth at the lower part of the fishing slip 4 to bite the outer wall of the fallen fish again, continuing to lift the fishing pipe column at the moment, and further increasing the lifting load;

(11) when the slip seat 5 is stressed downwards to reach the shearing force sheared by the shear pin 6, the shear pin 6 is sheared, at the moment, the slip seat 5 continuously pushes the shear slip 7 downwards, the lower end of the shear slip 7 is extruded by the conical surface of the first conical hole 15 and then contracts inwards, and the shear teeth act on the outer wall of the coiled tubing to be salvaged;

(12) and continuously lifting the fishing pipe column to increase the lifting load until the coiled tubing to be fished is cut off, thereby completing the fishing operation of the coiled tubing to be fished.

The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.