阅读说明：本技术 一种螺杆泵复合锚定装置 (Compound anchoring device of screw pump ) 是由 徐亮 王凤胜 程军 付显威 李汝强 李晓 刘媛 王钰斌 郝爱敏 张艳鹏 于 2018-09-13 设计创作，主要内容包括：本发明公开了一种螺杆泵复合锚定装置,包括内管以及安装在内管外壁上的轴向力卡瓦机构,还包括防转卡瓦机构,所述防转卡瓦机构包括防转卡瓦、弹簧,所述内管外壁在同一高度至少开设2个凹槽,每一个凹槽内均安装有防转卡瓦,所述防转卡瓦内壁与凹槽底面之间设置弹簧,防转卡瓦外壁开设至少一列竖牙。本发明克服现有技术存在的问题,使其通过液压传递方式实现可靠锚定,既能承受轴向力,又能承受扭矩,螺杆泵管柱的重量不压在底部,避免螺杆泵管柱受压弯曲。同时,配套专用底球,通过打压可以随时验证螺杆泵管柱的密封性,解决了螺杆泵管柱密封失效无法提前验证的问题。(The invention discloses a screw pump composite anchoring device, which comprises an inner pipe, an axial force slip mechanism and an anti-rotation slip mechanism, wherein the axial force slip mechanism is arranged on the outer wall of the inner pipe, the anti-rotation slip mechanism comprises an anti-rotation slip and a spring, at least 2 grooves are formed in the outer wall of the inner pipe at the same height, an anti-rotation slip is arranged in each groove, the spring is arranged between the inner wall of the anti-rotation slip and the bottom surface of each groove, and at least one row of vertical teeth are formed in the outer wall of the anti-rotation slip. The invention overcomes the problems in the prior art, realizes reliable anchoring by a hydraulic transmission mode, can bear axial force and torque, prevents the weight of the screw pump pipe column from pressing at the bottom, and avoids the screw pump pipe column from being bent under pressure. Meanwhile, the special bottom ball is matched, the sealing performance of the screw pump pipe column can be verified at any time through pressing, and the problem that the sealing failure of the screw pump pipe column cannot be verified in advance is solved.)

1. The utility model provides a compound anchoring device of screw pump, includes the inner tube and installs the axial force slips mechanism on the inner tube outer wall, its characterized in that still includes prevents changeing slips mechanism, prevent changeing slips mechanism including preventing changeing slips, spring, 2 recesses are seted up at least at same height to the inner tube outer wall, all install in each recess and prevent changeing the slips, prevent setting up the spring between changeing slips inner wall and the recess bottom surface, prevent changeing slips outer wall and set up at least one and be listed as perpendicular tooth.

2. The screw pump composite anchoring device of claim 1, wherein the upper end of the anti-rotation slip is provided with an upper restraining sheet, the upper restraining sheet extends into the upper pressing cap, the upper pressing cap is screwed and sleeved on the outer wall of the inner pipe, the lower end of the anti-rotation slip is provided with a lower restraining sheet, the lower restraining sheet extends into the lower pressing cap, and the lower pressing cap is screwed and sleeved on the outer wall of the inner pipe.

3. A screw pump composite anchoring device according to claim 1 or 2, wherein the anti-rotation slips have a right trapezoid cross section, the wide bottom of the right trapezoid faces the center of the inner pipe, and the narrow bottom of the right trapezoid faces outward, when the anti-rotation slips are supported on the inner wall of the casing and the inner pipe is rotated, the junction of the inclined edge and the wide bottom of the anti-rotation slips contacts with the side of the groove to form a contact line, the contact line moves inward, the anti-rotation slips simultaneously rotate around the contact line, and after the contact line moves inward to the bottom of the groove, the anti-rotation slips are locked on the inner wall of the casing.

4. A screw pump composite anchoring device according to claim 1 or 2, wherein the inner wall of the anti-rotation slips is provided with a spring hole, and the outer end of the spring extends into the spring hole.

5. The screw pump composite anchoring device of claim 1 or 2, wherein the axial force slip mechanism comprises a cone, slips and a driving mechanism, the inner wall of the cone is connected with the outer wall of the inner pipe in a threaded manner, the axial force slips are sleeved on the outer wall of the inner pipe in a sliding manner, the inner wall of the upper end of the axial force slips is provided with an inner conical surface, the outer wall of the cone is provided with an outer conical surface, the axial force slips run on the outer conical surface of the cone through the inner conical surface of the axial force slips, and the lower end of the axial force slips is pressed against the upper end surface of the driving mechanism.

6. The composite anchoring device of a screw pump according to claim 5, wherein the driving mechanism comprises a sealing cylinder and a lower joint, the sealing cylinder is sleeved on the outer wall of the inner pipe, the lower end of the axial force slip is pressed against the upper end surface of the sealing cylinder, the inner wall of the upper end of the sealing cylinder and the outer wall of the inner pipe are in a sealing state, the inner pipe is connected with the upper end of the lower joint in a thread-buckling manner, the inner wall of the lower end of the sealing cylinder and the outer wall of the lower joint are in a sealing state, a pressure chamber is formed between the sealing cylinder and the inner pipe, and the inner pipe is provided.

7. A compound anchoring device for a screw pump according to claim 6, in which the sealing cartridge is secured to the lower coupling by shear pins.

8. A screw pump composite anchoring device according to claim 6, wherein the number of the axial force slips is 3-6, the diameter of the arc of the outer side of the axial force slips is equal to the inner diameter of the casing being run in, and the outer sides of the 3-6 axial force slips enclose a circle.

9. A screw pump composite anchoring device according to claim 6, wherein the teeth of the axial force slips are inverted and supported on the inner wall of the casing so as not to move downwards but to lift upwards; the axial force slip pitch is 5-9mm, the number of teeth is 8-16 teeth, and the hardness HRC of the tooth surface is more than 45.

Technical Field

The invention relates to corollary equipment for an oil extraction well of a screw pump of an oil field, in particular to a screw pump composite anchoring device.

Background

In the process of oil extraction by using a screw pump, a ground driving device drives a sucker rod to rotate, the sucker rod drives a rotor of the screw pump to rotate, and the oil pipe is right-handed threads, so that the sucker rod driving the rotor of the screw pump to rotate is also right-handed threads. In order to avoid the accidents, the oil pipe is usually anchored by adopting an oil pipe anchoring method to avoid the accidents of oil pipe thread breaking and well dropping, the existing anchoring device is improved by a packer assembly, the anchoring is realized by the weight of an oil pipe column, and only axial force can be borne, while a screw pump oil production pipe column bears torque besides the axial force, so that the packer assembly is used as the anchoring device and needs large axial anchoring force, the oil pipe is bent, the abrasion of the oil pipe and a sucker rod is aggravated, the oil pipe is not very reliable, and the accidents of oil pipe dropping which is not firm after anchoring still occur.

The anti-drop device for the oil production string of the screw pump of the Chinese patent 200620088636.7 does not depend on the weight of the oil production string to anchor the stator of the screw pump, and anchors the stator of the screw pump by utilizing the working characteristic of self rotation of the screw pump, an oil pipe above the stator of the screw pump has no counter torque, the oil production string can not be broken off, the anti-drop device for the oil production string of the screw pump meets the requirement of improving the upper end thread of the stator of the screw pump, the screwing direction is changed into right-handed thread into left-handed thread, screw pump manufacturers cannot independently produce a screw pump with different thread turning directions for the screw pump oil production pipe string anti-tripping device, the screw pump is inconvenient to use, the screw pump oil production pipe string anti-tripping device is used for only welding the thread at the upper end of the screw pump on site to prevent the thread from tripping, when the screw pump needs to be lifted out, the welded junction needs to be cut, and the screw pump is very inconvenient to use, so that the screw pump is not popularized and used.

Disclosure of Invention

The invention aims to provide a screw pump composite anchoring device, which overcomes the problems in the prior art, can bear axial force and torque, prevents the screw pump pipe column from being pressed and bent due to the fact that the weight of the screw pump pipe column is not pressed at the bottom, and can be anchored reliably.

In order to achieve the purpose, the invention provides the following technical scheme that the screw pump composite anchoring device comprises an inner pipe, an axial force slip mechanism and an anti-rotation slip mechanism, wherein the axial force slip mechanism is arranged on the outer wall of the inner pipe, the anti-rotation slip mechanism comprises an anti-rotation slip and a spring, at least 2 grooves are formed in the outer wall of the inner pipe at the same height, the anti-rotation slip is arranged in each groove, the spring is arranged between the inner wall of the anti-rotation slip and the bottom surface of each groove, and at least one row of vertical teeth are formed in the outer wall of the anti-rotation slip.

Prevent changeing slips upper end and set up restraint piece, go up in restraint piece stretches into the upper pressure cap, go up and press cap screw thread formula suit including the outer wall of the pipe, prevent changeing slips lower extreme and set up restraint piece down, in restraint piece stretches into the lower pressure cap down, press cap screw thread formula suit including the outer wall of the pipe down.

The anti-rotation slip is characterized in that the cross section of the anti-rotation slip is in a right trapezoid shape, the wide bottom edge of the right trapezoid shape faces the center of the inner pipe, the narrow bottom edge of the right trapezoid shape faces outwards, when the anti-rotation slip is supported on the inner wall of the casing pipe to rotate the inner pipe, the junction of the inclined edge and the wide bottom edge of the anti-rotation slip is in contact with the side edge of the groove to form a contact line, the contact line moves inwards, the anti-rotation slip rotates around the contact line simultaneously, and the anti-rotation slip is locked on the inner wall of the casing pipe after the contact line moves inwards to the bottom.

The inner wall of the anti-rotation slip is provided with a spring hole, and the outer end of the spring extends into the spring hole.

The axial force slips mechanism comprises a cone, slips and a driving mechanism, wherein the inner wall of the cone is connected to the outer wall of the inner pipe in a threaded manner, the inner wall of the inner pipe is sleeved with the axial force slips in a sliding manner, the inner conical surface is arranged on the inner wall of the upper end of the axial force slips, the outer conical surface is arranged on the outer wall of the cone, the axial force slips run on the outer conical surface of the cone through the inner conical surface, and the lower end of the axial force slips is pressed against the upper end surface of the driving mechanism.

Actuating mechanism is including a sealed section of thick bamboo, lower clutch, sealed section of thick bamboo suit is at the inner tube outer wall, axial force slips lower extreme top is at sealed section of thick bamboo up end, and sealed section of thick bamboo upper end inner wall is encapsulated situation with the inner tube outer wall, the inner tube is connected to lower clutch upper end screw thread formula, and sealed section of thick bamboo lower extreme inner wall is encapsulated situation with the lower clutch outer wall, form the pressure chamber between sealed section of thick bamboo and the inner tube, the inner tube is seted up and is linked the through-hole to the pressure chamber.

The sealing cylinder is fixed on the lower joint through shear pins.

The number of the axial force slips is 3-6, the diameter of an arc outside the axial force slips is equal to the inner diameter of a lowered casing, and the outer sides of the 3-6 axial force slips form a circle.

The tooth shape of the axial force slip is inverted tooth shape, and the axial force slip can not move downwards after being supported on the inner wall of the sleeve and can only be lifted upwards; the axial force slip pitch is 5-9mm, the number of teeth is 8-16 teeth, and the hardness HRC of the tooth surface is more than 45.

Compared with the prior art, the invention has the following beneficial effects:

when the screw pump rotates, the junction of the bevel edge of the anti-rotation slip and the wide bottom edge is contacted with the side edge of the groove by the rotating force, the contact line of the anti-rotation slip moves inwards, the anti-rotation slip simultaneously rotates around the contact line, and after the contact line moves inwards to the bottom of the groove, the anti-rotation slip is locked on the inner wall of the sleeve pipe, so that the screw pump pipe column is anchored on the circumference. And then the oil production pipe column of the screw pump is pressed, the pressure of the inner pipe is increased, hydraulic pressure is transmitted into a pressure cavity formed by the sealing cylinder and the inner pipe from a communicating hole at the lower part of the inner pipe, so that the sealing cylinder generates upward thrust, when the upward thrust is greater than the bearing capacity of the shear pin, the shear pin is sheared off, the sealing cylinder moves upwards, the distance between the cone and the sealing cylinder is shortened, and the slips are expanded and anchored on the sleeve under the action of the cone, so that the oil production pipe column of the screw pump is anchored in the axial direction. Therefore, the invention overcomes the problems in the prior art, can bear axial force and torque, can prevent the screw pump tubular column from being pressed and bent because the weight of the screw pump tubular column is not pressed at the bottom, has reliable anchoring, can prevent the screw pump oil production tubular column from tripping, can normally produce an oil production system for a long time, and has obvious economic benefit. Meanwhile, the special bottom ball is matched, the sealing performance of the screw pump pipe column can be verified at any time through pressing, and the problem that the sealing failure of the screw pump pipe column cannot be verified in advance is solved.

Drawings

FIG. 1 is a schematic structural view of a screw pump composite anchoring device according to the present invention;

fig. 2 is a sectional view a-a of fig. 1.

In the figure: the anti-rotation anchor comprises an inner pipe 1, an upper pressing cap 2, an anti-rotation slip 3, a spring 4, a lower pressing cap 6, a cone 7, an axial force slip 8, a sealing cylinder 9, an upper sealing ring 10, a lower sealing ring 13, a shear pin 14 and a lower joint 15.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 2, the present invention provides a technical solution: the utility model provides a compound anchoring device of screw pump, includes inner tube 1 and installs the axial force slips mechanism on the inner tube outer wall, still includes and prevents changeing slips mechanism, prevent changeing slips mechanism including preventing changeing slips 3, spring 4, 2 recesses 5 are seted up at least at same height to the inner tube outer wall, all install in each recess and prevent changeing slips 3, prevent setting up spring 4 between changeing slips inner wall and the recess bottom surface, prevent changeing slips outer wall and set up at least one and erect tooth 17.

Prevent changeing slips upper end and set up restraint piece, go up restraint piece and stretch into in last pressure cap 2, go up and press cap thread formula suit including outer wall of the pipe, prevent changeing slips lower extreme and set up restraint piece down, in restraint piece stretches into down pressure cap 6 down, press cap thread formula suit including outer wall of the pipe down.

The cross section of the anti-rotation slip 3 is in a right trapezoid shape, the wide bottom edge of the right trapezoid shape faces the center of the inner pipe, the narrow bottom edge of the right trapezoid shape faces outwards, when the anti-rotation slip is supported on the inner wall of the sleeve to rotate the inner pipe 1, the junction of the inclined edge and the wide bottom edge of the anti-rotation slip is in contact with the side edge of the groove 5 to form a contact line, the contact line moves inwards, the anti-rotation slip rotates around the contact line simultaneously, and the contact line moves inwards to the bottom of the groove, so that the anti-rotation slip is locked on the inner wall of the sleeve.

The inner wall of the anti-rotation slip 3 is provided with a spring hole, and the outer end of the spring 4 extends into the spring hole.

The axial force slips mechanism comprises a cone 7, an axial force slips 8 and a driving mechanism, wherein the inner wall of the cone is connected with the outer wall of the inner pipe in a threaded manner, the inner wall of the inner pipe is sleeved with the axial force slips in a sliding manner, the inner conical surface is arranged on the inner wall of the upper end of the axial force slips, the outer conical surface is arranged on the outer wall of the cone, the axial force slips run on the outer conical surface of the cone through the inner conical surface of the axial force slips, and the lower end of the axial force slips is pressed against the upper.

Actuating mechanism is including a sealed section of thick bamboo 9, lower clutch 15, the inner tube outer wall in the sealed 9 suit of section of thick bamboo, axial force slips lower extreme top is at a sealed section of thick bamboo up end, and sealed 9 upper end inner walls and inner tube outer wall are encapsulated situation, the inner tube is connected to lower clutch 15 upper end screw thread formula, and sealed section of thick bamboo lower extreme inner wall and lower clutch outer wall are encapsulated situation, form the pressure chamber between a sealed section of thick bamboo 9 and the inner tube 1, inner tube 1 sets up the antithetical couplet through-hole 11 to the pressure chamber.

The inner pipe 1 is provided with a plurality of grooves 5, the inner side of an anti-rotation slip 3 is provided with a spring hole, a spring 4 is arranged in the spring hole, an anti-rotation slip 3 with the spring 4 is arranged in each groove 5, an upper pressing cap 2 and a lower pressing cap 6 are arranged on the inner pipe 1, the upper pressing cap 2 is positioned at the upper part of the anti-rotation slip 3, the lower pressing cap 6 is positioned at the lower part of the anti-rotation slip 3, the upper pressing cap 2 and the lower pressing cap 6 are connected with the inner pipe 1 into a whole, the upper pressing cap 2 buckles the upper restraint sheet of the anti-rotation slip 3, the lower pressing cap 6 buckles the lower restraint sheet of the anti-rotation slip 3, the cone 7 is connected at the middle part of the inner pipe 1, the cone 7 is positioned below the lower pressing cap 6, the lower part of the inner pipe 1 is provided with a connecting through hole 11, the connecting through hole 11 is positioned above the lower part thread of the inner pipe 1, the inner part of the sealing barrel 9 is sleeved at the lower part of the inner pipe 1, the lower part of, the slips 8 are arranged between the cone 7 and the sealing cylinder 9, the upper part of the slips 8 is arranged in a slip groove of the cone 7, the slip groove is a dovetail groove, the slips 8 are restrained by the dovetail groove and can not be separated from the cone 7, the conical surface of the slips 8 and the conical surface of the slip groove have the same taper and are matched with each other, when the slips 8 axially move in the slip groove, the slips 8 can be outwards expanded or withdrawn, the lower part of the slips 8 is hung on the upper part of the sealing cylinder 9, the sealing cylinder 9 is connected on the lower joint 7 by the shear pin 14, the diameter difference between the upper part and the lower part of the sealing cylinder 9 and the diameter difference between the lower part of the inner pipe 1 and the outer diameter difference of the lower joint 15 form a pressure chamber 12, the communicating hole 11 is communicated with the pressure chamber 12, an upper sealing ring 10 is arranged between the upper part of the sealing cylinder 9 and the inner pipe 1, and a lower sealing ring 13 is arranged between the lower part, the pressure cavity 12 is sealed by the upper sealing ring 10 and the lower sealing ring 13, the anti-rotation slips 3 are in an expansion state by the spring 4, the diameter of a circle formed by the outer sides of the anti-rotation slips 3 is larger than the inner diameter of a matched oil well casing, the anti-rotation slips 3 are tightly attached to the inner wall of the casing after the casing is put into the casing, friction force exists between the anti-rotation slips and the inner wall of the casing, the cross section of the anti-rotation slips 3 is in a right trapezoid shape, the wide bottom edge of the right trapezoid faces the center of the inner pipe 1, the narrow bottom edge of the right trapezoid faces outwards, when the anti-rotation slips 3 are supported on the inner wall of the casing to rotate the inner pipe 1, the junction of the inclined edge and the wide bottom edge of the anti-rotation slips 3 is in contact with the side edge of the groove 5, the contact line of the anti-rotation slips move inwards, the anti-rotation slips 3 simultaneously rotate around the contact line.

The number of the slips 8 is 3-6, the diameter of the arc outside the slips 8 is equal to the inner diameter of the lowered casing, and the outside of the slips 8 with 3-6 pieces forms a circle.

The teeth of the slips 8 are inverted teeth, and the slips can not move downwards after being supported on the inner wall of the casing pipe and can only be lifted upwards. The tooth pitch is 5-9mm, the number of tooth tracks is 8-16 teeth, the surface hardness HRC of the teeth is more than 45, the teeth are generally carburized and quenched by 20CrMoTi, and the surface hardness HRC is more than 50.

The invention is connected to a screw pump pipe column, when a screw pump rotates, the rotating force causes the junction of the bevel edge 16 and the wide bottom edge of the anti-rotation slip 3 to be contacted with the side edge of the groove 5, the contact line of the anti-rotation slip 3 moves inwards, the anti-rotation slip 3 simultaneously rotates around the contact line, and after the contact line moves inwards to the bottom of the groove 5, the outer vertical teeth 17 of the anti-rotation slip 3 are locked on the inner wall of the sleeve pipe, so that the screw pump pipe column is anchored on the circumference. And then the pressure is applied to the oil production pipe column of the screw pump, the pressure of the inner pipe 1 is increased, the hydraulic pressure is transmitted into a pressure cavity 12 formed by the sealing cylinder 9 and the inner pipe 1 from a communicating hole 11 at the lower part of the inner pipe, so that the sealing cylinder 9 generates upward thrust, when the upward thrust is greater than the bearing capacity of the shear pin 14, the shear pin 14 is sheared, the sealing cylinder 9 moves upwards, the distance between the cone 7 and the sealing cylinder 9 is shortened, the slip 8 is expanded and anchored on the sleeve under the action of the cone 7, and the oil production pipe column of the screw pump is anchored in the axial direction. Therefore, the invention can bear axial force and torque.

In the description of the present invention, it is to be understood that the positional indications or positional relationships are based on those shown in the drawings and are for the purpose of facilitating the description of the present invention, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.