CN211081773U - Oil pipe anchor - Google Patents

Abstract

The utility model relates to an oil pipe anchor, this oil pipe anchor, include: the central pipe extends along the up-down direction and is sleeved with a slip connecting seat and a slip jacking seat; the slips are connected to the slip connecting seat; the slip jacking seat is provided with a jacking inclined surface which is used for jacking the slips when the slips move towards the slip jacking seat; the centralizer is sleeved on the central pipe and used for elastically jacking and pressing the inner wall of the sleeve pipe; the central pipe is provided with a reversing track groove, the reversing guide rail groove comprises a long groove and a short groove, and the reversing guide groove is matched with the centralizer so as to realize the switching of the centralizer in the guiding along the long groove and the guiding along the short groove; the slips are guiding slips; the slip connecting seat is provided with an extreme limit position which is farthest away from the slip jacking seat in an up-and-down moving stroke relative to the central pipe, and when the slip connecting seat is positioned at the extreme limit position, one end of a slip, which is far away from the slip connecting seat, is in a state of being in contact with the jacking inclined plane; the slip connecting seat and the centralizer are arranged in a vertically separated mode.

Description

Oil pipe anchor

Technical Field

The utility model relates to an oil pipe anchor.

Background

In the oil extraction process of the oil pumping unit in the oil field, the oil pipe in the sleeve is in a telescopic creeping state for a long time due to the up-and-down reciprocating motion of the oil pumping unit, and further eccentric wear and fatigue damage of the oil pipe are caused, and the service life of the oil pipe is shortened. To solve the above problems, it is common to install a tubing anchor at a lower portion of the tubing to anchor the tubing to protect the tubing.

The utility model discloses a chinese utility model patent that the bulletin number is CN201092831Y discloses a lift-draw formula screw pump anchor, this anchor includes the center tube, the upper end of center tube is connected with slips top supporting seat (cone promptly), the lower extreme is connected with the coupling, lower part cover at the center tube is equipped with slips connecting seat (slips support promptly) and lock sleeve, it is equipped with the slips to inlay on the slips support, the slips holds in the palm to be connected with the centralizer (the body of rightting promptly) of suit on the center tube through the screw thread, be equipped with the switching-over track groove on the center tube periphery, centralizer and lock sleeve pass through threaded connection and form the switching-over room, install the sliding ring in the switching-over room, two sliders are installed to the symmetry on the sliding ring, two sliders.

The flaring structure is formed by the upper part of the inner side of the slip and the central pipe in the anchor, and dirt and the like in the sleeve can easily fill the inner side of the slip in the process of lifting the oil pipe, so that the slip is expanded, and the oil pipe is easily lifted and clamped.

The utility model discloses a chinese utility model patent that the publication number of granting is CN209195312U discloses a hydraulic anchor, this anchor includes the center tube, the center tube is equipped with slips back-shore seat outward (the slips cone in this patent promptly) and the slips that uses with slips cone cooperation, the slips is the direction slips, this slips and slips back-shore seat along the back-shore inclined plane direction cooperation on the slips back-shore seat, slips and slips connecting seat (the slips seat in this patent promptly) direction cooperation simultaneously, so that slips and slips connecting seat form the stopper and can produce relative displacement in footpath along the axial, radial displacement that produces when adaptation slips is on slips back-shore seat direction motion. The setting piston is movably assembled outside the central pipe, when high-pressure fluid is pumped into the setting piston, the setting piston pushes the slips to move upwards under the action of pressure, and the slips expand along the radial direction in the ascending process to finish the anchoring of the hydraulic anchor; the setting piston is provided with a deblocking pressure spring extending in the up-down direction, the deblocking pressure spring is used for applying elastic acting force to the setting piston to reset the setting piston when pressure is removed, and the slips move downwards and contract along the radial direction at the moment to complete deblocking of the hydraulic anchor.

The slips of the hydraulic anchor adopt the guide slips, so that although dirt and the like can be prevented from easily filling the inner side of the slips, the slips cannot be matched with the centralizer to realize anchoring, and the slips cannot be suitable for the oil pipe anchor with the centralizer.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an oil pipe anchor to solve the anchor that has the centralizer among the prior art and playing the oil pipe in-process, it is inboard that the slips is easily filled up to dirt etc. in the sleeve, makes the slips expansion, and then causes oil pipe to lift the technical problem of jamming easily.

In order to achieve the above object, the utility model discloses oil pipe anchor's technical scheme is:

the oil pipe anchor comprises a central pipe, wherein slips and a centralizer are arranged on the central pipe; the central pipe extends along the up-down direction and is sleeved with a slip connecting seat and a slip jacking seat; the slip connecting seat is sleeved on the central pipe in a guiding manner along the up-down direction, and the slips are connected to the slip connecting seat; the slip jacking seat is fixed on the central pipe and is provided with a jacking inclined surface which is used for jacking the slips when the slips move towards the slip jacking seat so as to open the slips; the centralizer is sleeved on the central pipe, is used for elastically jacking against the inner wall of the sleeve and can move up and down relative to the central pipe; the central pipe is provided with a reversing track groove, the reversing guide rail groove comprises a long groove and a short groove, and the reversing guide groove is matched with the centralizer so as to realize the switching of the centralizer in the guiding along the long groove and the guiding along the short groove; the slip is a guide slip, an inclined guide structure is arranged on the slip jacking seat and used for guiding and assembling the slip on the slip jacking seat along a jacking inclined plane, a radial guide structure is arranged on the slip connecting seat and used for guiding and assembling the slip on the slip connecting seat along the radial direction; the slip connecting seat is provided with an extreme limit position which is farthest away from the slip jacking seat in an up-and-down moving stroke relative to the central tube, and when the slip connecting seat is positioned at the extreme limit position, one end of the slip, which is far away from the slip connecting seat, is in a state of being contacted with the jacking inclined plane; the slip connecting seat and the centralizer are arranged in a vertically separated manner; the length of the short groove satisfies: when the centralizer is positioned at the upper end of the short groove, the slip connecting seat and the centralizer are arranged at intervals in the vertical direction; the length of the long groove satisfies: when the centralizer is positioned at the upper part of the long groove and continues to move upwards, the centralizer pushes the slip connecting seat to enable the slip connecting seat to push the slips to move upwards and prop the slips to be outwards opened through the slip propping seat, and therefore anchoring of the oil pipe anchor is achieved.

The beneficial effects are that: the slips are set to be guiding slips, the slip connecting seat is enabled to have extreme limit, when the slip connecting seat is in the extreme limit position, one end, far away from the slip connecting seat, of the slips is always in contact with the jacking inclined plane, and therefore dirt in the sleeve is prevented from entering the inner side of the slips; the slip connecting seat and the centralizer are arranged separately, and when the centralizer is positioned at the upper end of the short groove, the slip connecting seat and the centralizer are arranged at intervals in the vertical direction; when the centralizer is positioned at the upper part of the long groove and continues to move upwards, the centralizer pushes the slip connecting seat to enable the slip connecting seat to push the slips to move upwards and prop the slips to be outwards opened through the slip propping seat, and therefore anchoring of the oil pipe anchor is achieved. The utility model discloses an oil pipe anchor has the effect of rightting in, and it is inboard to have guaranteed that the dirt in the sleeve can not enter into the slips, and then guarantees lifting smoothly of oil pipe.

Furthermore, be equipped with the spacer pin between slips and the slips jacking seat, this spacer pin is in at the slips connecting seat extremely spacing when to the slips jacking seat spacing to make the slips keep away from the one end of slips connecting seat with the contact of jacking inclined plane.

The beneficial effects are that: the structure of the slip and the slip jacking seat is small, and a limiting pin is convenient to be arranged between the slip and the slip jacking seat.

Furthermore, the limiting pin is arranged on a jacking inclined surface of the slip jacking seat, a limiting groove is formed in the inner side surface of the slip, and the limiting pin is used for being in limiting fit with the upper end of the limiting groove.

The beneficial effects are that: because the structure of slips is less, set up the spacing groove on the slips, easily the processing of guide way.

Furthermore, the slip is provided with an avoiding hole which is radially communicated along the central pipe, so that the limiting pin is avoided when the limiting pin is installed on the slip jacking seat.

The beneficial effects are that: through set up the hole of dodging on the slips, the spacer pin of being convenient for is installed on the slips jacking seat through dodging the hole.

Furthermore, the limiting pin is arranged at the lower part of the top bracing inclined plane.

The beneficial effects are that: the slips can be made thicker at the moment so as to ensure the strength of the slips; and the limiting pin is arranged at the lower part of the top bracing inclined plane, so that the avoiding hole is arranged at the lower part of the slip, and the strength of the upper part of the slip is ensured.

Furthermore, the slip teeth on the slip are of a columnar structure, and the outer end face of the columnar structure extends obliquely outwards from top to bottom.

The beneficial effects are that: so that dirt in the well is not easy to remain on the slip teeth, and the engaging force between the slip teeth and the inner wall of the casing is ensured.

Furthermore, the slip teeth are arranged in at least two rows at intervals along the circumferential direction of the central pipe, and a plurality of slip teeth are arranged in each row at intervals along the axial direction of the central pipe.

The beneficial effects are that: the slips are arranged at intervals in the radial direction and the circumferential direction of the central pipe, so that dirt in a well is not easy to remain between the slips, and the engaging force between the slips and the inner wall of the casing pipe is further ensured.

Furthermore, the slant guide structure is a top support seat guide groove, the cross section of the top support seat guide groove is in a T shape to form a necking structure, the necking structure is used for preventing the slips from being separated from the center pipe along the radial direction, and the groove bottom of the top support seat guide groove forms the top support inclined plane.

The beneficial effects are that: the size of slips jacking seat is great compared in the slips, and the jacking seat guide groove is arranged on the slips jacking seat, so that the slips jacking seat is convenient to process.

Furthermore, the radial guide structure is a connecting seat guide groove, and the connecting seat guide groove extends obliquely outwards from top to bottom.

The beneficial effects are that: the connecting seat guide groove is obliquely and outwards extended from top to bottom, so that the acting force of the slips along the radial motion of the central tube can be applied to the slips in the upward motion process of the slip connecting seat, and the slips can be favorably radially opened along the central tube.

Further, the slip jacking seat comprises an upper joint and a slip cone, the upper joint is in threaded connection with the upper end of the central tube, an inner step is arranged at the lower end of the upper joint, an inner thread is arranged on the vertical step surface of the inner step, an outer step is arranged at the upper end of the slip cone, an outer thread is arranged on the vertical step surface of the outer step, and the outer thread and the inner thread are assembled in a spiral mode to achieve fixed assembly of the slip cone and the upper joint.

The beneficial effects are that: through the cooperation of interior step and outer step, make the outer peripheral face of top connection and the outer peripheral face parallel and level of slips cone, avoided top connection or slips cone radially evagination at the center tube.

Drawings

Fig. 1 is a schematic structural view of an embodiment 1 of the oil pipe anchor according to the present invention;

FIG. 2 is a schematic view of the structure of the slip cone of FIG. 1;

FIG. 3 is a bottom view of FIG. 2;

FIG. 4 is a schematic diagram of the slip of FIG. 1;

FIG. 5 is a right side view of FIG. 4;

FIG. 6 is a schematic view of the slip bowl of FIG. 1;

FIG. 7 is a top view of FIG. 6;

FIG. 8 is a schematic view of the cone, slips, and slip bowl assembly of FIG. 1;

FIG. 9 is a schematic view of the reversing guide slots in the center tube of FIG. 1;

in the figure: 1-upper joint; 2-a central tube; 3-a slip cone; 4-a limit pin; 5-slips; 6-slips; 7-avoiding holes; 8-a slip coupling seat; 9-a centralizer; 10-a sliding pin; 11-short grooves; 12-long groove; 13-lower joint; 14-cone guide grooves; 15-limiting pin holes; 16-a guide projection; 17-a limit groove; 18-connecting seat guide groove; 19-a transition groove; 20-outer step; 21-T type guide rail.

Detailed Description

The following describes embodiments of the present invention with reference to the accompanying drawings.

The utility model discloses a specific embodiment 1 of oil pipe anchor:

as shown in fig. 1, the tubing anchor comprises a central tube 2, the central tube 2 extends in the up-down direction, and an upper joint 1, a slip cone 3, a slip 6, a slip connecting seat 8, a centralizer 9 and a lower joint 13 are sequentially sleeved on the central tube 2 from top to bottom. The upper joint 1 is in threaded connection with the upper end of the central pipe 2, the lower joint 13 is in threaded connection with the lower end of the central pipe 2, and the upper joint 1 and the lower joint 13 are respectively used for connecting corresponding oil pipes.

As shown in fig. 1 and 2, the slip cone 3 is threaded onto the top sub 1. Specifically, the lower extreme of top connection 1 is equipped with interior step, and interior step is the annular, is equipped with the internal thread on the vertical step face of interior step, and the upper end of slips cone 3 is equipped with outer step 20, and outer step 20 be the annular and with interior step adaptation, be equipped with the external screw thread on the vertical step face on the outer step 20, external screw thread and internal thread spiral assembly to realize slips cone 3 and top connection 1's fixed assembly, and then realize slips cone 3 fixed assembly on center tube 2. In other embodiments, the slip cone and the top sub may be integrally provided. In other embodiments, the upper end of the slip cone is outside the upper joint, such as the connection between the upper joint and the slip cone in grant CN 209195312U.

As shown in fig. 1 to 3, a plurality of cone guide grooves 14 are provided on the outer circumferential surface of the slip cone 3, the cone guide grooves 14 form a top support seat guide groove, the top support seat guide groove forms an oblique guide structure, each cone guide groove 14 is arranged along the circumferential direction of the slip cone 3 at intervals, the cone guide grooves 14 extend obliquely outward from bottom to top, a limit pin hole 15 is provided at the lower part of the cone guide groove 14, a limit pin 4 is fixedly assembled in the limit pin hole 15, and the axis of the limit pin 4 is perpendicular to the groove bottom of the cone guide groove 14.

In this embodiment, the limit pin hole 15 is a threaded hole, the limit pin 4 has an external thread, and the limit pin 4 is spirally assembled in the limit pin hole 15 to realize the fixed assembly of the limit pin 4. It should be noted that the cross section of the cone guide groove 14 is T-shaped, and the groove bottom of the cone guide groove 14 forms a shoring inclined surface, i.e., the limit pin hole 15 is provided on the shoring inclined surface. Of course in other embodiments the cross-section of the cone guide slot may be dovetail shaped.

As shown in fig. 1, 4 and 5, the slips 6 are guiding slips having a conventional structure, and the slips 6 include an upper slip body and a lower T-shaped guide rail 21, and the slip body is guided and fitted in the cone guide groove 14. Specifically, the left side and the right side of the slip main body are provided with the guide protrusions 16, so that the cross section of the slip main body is T-shaped, the inclination angle of the guide protrusions 16 is the same as that of the cone guide groove 14, and the slip main body is in guide fit with the cone guide groove 14 through the two guide protrusions 16 so as to realize that the slip main body is guided and assembled in the cone guide groove 14, and further realize that the slip 6 is guided and assembled on the slip cone 3.

The inboard of slips main part is equipped with spacing groove 17, and the extending direction of spacing groove 17 is unanimous with the extending direction of cone guide way 14, and the upper end of spacing groove 17 is sealed for with the spacing cooperation of spacer pin 4, deviate from in the cone guide way 14 of slips cone 3 to prevent slips 6, make slips 6 keep away from the one end of slips connecting seat 8 all the time with the tank bottom contact of cone guide way 14, and then guarantee that the dirt in the sleeve can not enter into the slips inboard.

In this embodiment, the outside of slips main part is equipped with slips 5, and slips 5 is the columnar structure, and this columnar structure's outer terminal surface top-down leans out the extension, makes slips 5's structure comparatively simple, the processing of slips 5 of being convenient for. In this embodiment, the slip 5 has two rows along the circumference interval arrangement of center tube 2, and every row of slip 5 has a plurality ofly along the axial interval arrangement of center tube 2, and slip 5 is at the equal interval setting in the radial of center tube 2 and circumference, makes dirt in the well be difficult to persist between slip 5 to guarantee the bite-force of slip 5 and sleeve pipe inner wall. It should be noted that, the slip main body is provided with a mounting hole, and the slip teeth 5 are embedded in the mounting hole, wherein, the slip teeth 5 are made of materials such as hard alloy or ceramic. In other embodiments, the slip elements are arranged in more than three axially spaced rows along the base pipe, and each row of slip elements is arranged in a plurality of axially spaced rows along the base pipe.

In the embodiment, the lower part of the slip main body is provided with the avoidance hole 7, the avoidance hole 7 is a circular hole, the avoidance hole 7 runs through and extends along the radial direction of the central pipe 2 and is perpendicular to the groove bottom of the cone guide groove 14, so that the limitation pin 4 is avoided when the limitation pin 4 is installed on the slip cone 3, and the limitation pin 4 is conveniently installed on the slip cone 3; and the avoidance hole 7 is arranged at the lower part of the slip main body, so that the slip teeth 5 can be avoided, and the arrangement of the slip teeth 5 is prevented from being influenced. In other embodiments, the relief hole may be disposed at an intermediate position in the slip body, with the relief hole being between the two rows of slip elements.

As shown in fig. 1, 6 and 7, the slip connecting base 8 is sleeved on the central tube 2 in an up-and-down direction, a plurality of connecting base guide grooves 18 are formed in the slip connecting base 8, the connecting base guide grooves 18 form a radial guide structure, the connecting base guide grooves 18 are arranged at intervals along the circumferential direction of the central tube 2, and the connecting base guide grooves 18 correspond to the slips 6 one by one. In this embodiment, the T-shaped rails 21 of the slips 6 are guided to fit within the corresponding coupling block guide grooves 18 to effect coupling of the slips 6 to the slip coupling block 8.

In this embodiment, the cross section of the connecting seat guide groove 18 is T-shaped, and the connecting seat guide groove 18 extends outwards from top to bottom, so that the acting force of the slip 6 moving along the radial direction of the central tube 2 is also applied to the slip 6 during the upward movement of the slip connecting seat 8, which is beneficial to the radial opening of the slip 6 along the central tube 2, wherein the inclined extending direction of the connecting seat guide groove 18 is perpendicular to the groove bottom of the cone guide groove 14. In other embodiments, the connecting seat guide groove may be a dovetail groove; or the slip connecting seat is provided with a connecting seat guide bulge, and the lower part of the corresponding slip is provided with a guide groove matched with the connecting seat guide bulge.

As shown in fig. 1 and 9, the central tube 2 is provided with a reversing track groove, the reversing guide groove is adapted to the centralizer, and the reversing track groove includes a long groove 12, a short groove 11, and a transition groove 19 communicating the long groove 12 and the short groove 11.

The slip coupling seat 8 and the centralizer 9 are arranged separately in the up and down direction to facilitate the switching of the centralizer within the long 12 and short 11 grooves. The centralizer 9 is sleeved on the central tube 2, a sliding pin 10 is arranged on the inner side of the centralizer 9, the outer side of the centralizer is used for elastically pressing against the inner wall of the sleeve, and the centralizer 9 slides in the long groove 12 and the short groove 11 through the sliding pin 10 and can be switched between the long groove 12 and the short groove 11. In other embodiments, a slider may be provided on the inside of the centralizer, with the centralizer sliding within the long and short slots via the slider.

In the embodiment, the length of the short groove 11 is such that when the centralizer 9 is positioned at the upper end of the short groove 11, the slip connecting seat 8 and the centralizer 9 are arranged at intervals in the up-down direction; the length of the long groove 12 is satisfied, when the centralizer 9 is positioned at the upper part of the long groove 12 and continues to move upwards, the centralizer 9 pushes the slip connecting seat 8, so that the slip connecting seat 8 pushes the slip 6 to move upwards and props the slip 6 to open outwards through the slip cone 3, and the anchoring of the oil pipe anchor is realized.

In this embodiment, the assembly of the centralizer 9 on the central tube 2 belongs to the prior art and will not be described in detail herein.

It should be noted that the upper joint 1 and the slip cone 3 constitute a slip jacking seat.

In the assembly process of the slips 6 and the slip cone 3, as shown in fig. 1, the T-shaped guide rail 21 of each slip 6 is assembled in the connecting seat guide groove 18 of the slip connecting seat 8, and then the slip main body of each slip 6 is assembled in the cone guide groove 14 of the slip cone 3; as shown in fig. 8, the slip cone 3 is moved downwards relative to the slip 6 until the limiting pin hole 15 is aligned with the avoiding hole 7, and then the limiting pin 4 is inserted into the avoiding hole 7 and is spirally assembled in the limiting pin hole 15, so that the outer end of the limiting pin 4 does not interfere with the slip; and finally, sleeving the slip connecting seat 8, the slip 6 and the slip cone 3 on the central pipe 2 from the upper end of the central pipe 2, so that the assembly of the slip 6 and the slip cone 3 on the central pipe 2 is completed.

In specific implementation, as shown in fig. 1, the oil pipe anchor is lowered into the well along with the oil pipe, at this time, the limiting groove 17 of the slip 6 is in blocking fit with the limiting pin 4 on the slip cone 3, and the slip is in a contraction state; the sliding pin 10 is located the short slot 11, because when the sliding pin 10 slides to the top of short slot 11, centralizer 9 and slips connecting seat 8 interval set up, and centralizer 9 can not give the ascending jacking force of slips connecting seat 8, consequently, slips 6 can not cause oil pipe midway anchoring.

When the oil pipe anchor reaches the anchoring position, the central pipe 2 is lifted up and then the central pipe 2 is lowered down, so that the sliding pin 10 is reversed from the short groove 11 to the long groove 12 through the aqueduct 19, and the centralizer 9 is reversed from sliding in the short groove 11 to slide in the long groove 12; then, the central tube 2 is continuously lowered, the centralizer 9 can upwards push the slip connecting seat 8 and the slip 6 to move upwards together, and due to the propping action of the slip cone 3, the slip 6 is outwards opened in the upward movement process, so that the slip teeth 5 on the slip 6 are meshed on the inner wall of the sleeve, the anchoring of the oil tube is realized, and the problem of the telescopic creeping of the oil tube is solved.

When the anchoring is required to be removed, the central pipe 2 is lifted upwards, the central pipe 2 can drive the upper joint 1 and the slip cone 3 to move upwards, and the slip 6 is clamped on the inner wall of the casing pipe, so that the slip cone 3 and the slip 6 generate relative motion, the slip 6 moves downwards from the cone guide groove 14 of the slip cone 3, the slip teeth 5 on the slip 6 are separated from the inner wall of the casing pipe, and the anchoring is removed; in the process that the slips 6 move downwards, the slip 6 is limited in the cone guide groove 14 by the limiting pin 4, the slips 6 are prevented from being separated, the slips 6 and the cone guide groove 14 are always kept in contact, dirt in the sleeve is prevented from entering the inner side of the slips 6, and smooth pulling-out of an oil pipe is guaranteed.

The utility model discloses a specific embodiment 2 of oil pipe anchor:

the difference from embodiment 1 is that the extending direction of the guide groove of the connecting seat is perpendicular to the central axis of the central tube.

The utility model discloses a specific embodiment 3 of oil pipe anchor:

the difference with embodiment 1 is that the slips are slips extending circumferentially along the base pipe, such as the slips disclosed in the grant publication No. CN 203729920U.

The utility model discloses a specific embodiment 4 of oil pipe anchor:

the difference from the embodiment 1 is that a limit pin hole is arranged in the middle of the cone guide groove, and a limit pin is fixedly assembled in the limit pin hole. At the moment, the position of the limiting pin in limiting fit with the slip is high, the slip needs to be made thinner so as to avoid the problem of clamping stagnation generated in the process of lifting the oil pipe, and the thickness of the slip is thinner, so that the strength of the slip can be reduced, and the stability of the slip is poorer when the slip is meshed with the inner wall of the sleeve.

The utility model discloses a specific embodiment 5 of oil pipe anchor:

the difference with embodiment 1 lies in, does not set up the hole of dodging on the slips, and the spacer pin elasticity assembly is downthehole at the spacer pin this moment, and the spacer pin stretches out the spacer pin hole under the normal condition and arranges promptly, and when external force pressed, the spacer pin can retract in the spacer pin hole to realize the installation of slips and slips cone. In other embodiments, no avoidance hole is formed in the slip, the limiting pin hole is a through hole penetrating through the central pipe, and the limiting pin can be fixed in the limiting pin hole from the central through hole of the central pipe.

The utility model discloses a specific embodiment 6 of oil pipe anchor:

the difference from the embodiment 1 is that the limiting pin is arranged on the inner side of the slip and protrudes out of the inner side of the slip, and the limiting groove is arranged in the cone guide groove of the slip cone.

The utility model discloses a specific embodiment 7 of oil pipe anchor:

the difference with embodiment 1 is that the limiting pin is arranged on the central tube and protrudes out of the outer peripheral surface of the central tube, the limiting groove is arranged on the slip, and the position of the limiting pin does not influence the rising of the slip connecting seat and the centralizer at the moment. Of course, in other embodiments, a limiting groove may be formed in the central pipe, and a limiting pin may be formed in the slip, where the limiting pin should not interfere with the slip cone during movement.

The utility model discloses a specific embodiment 8 of oil pipe anchor:

the difference with embodiment 1 lies in, does not set up the spacer pin on the slips cone yet, does not set up the spacing groove on the slips yet, sets up the step on the center tube, and the upper portion diameter of the center tube of this step department is less than the lower part diameter, and the step is spacing cooperation in the upper and lower direction with the lower terminal surface of slips connecting seat to realize spacing to the slips, wherein the slips connecting seat should bulge the step in the radial of center tube and arrange to do not influence the commutator and push away the slips connecting seat.

The utility model discloses a specific embodiment 9 of oil pipe anchor:

the difference with embodiment 1 lies in that, the spacer pin sets up on the center tube and the outer peripheral face setting of protrusion center tube, and the spacing groove sets up on the slips connecting seat, requires the thickness dimension of slips connecting seat in the center tube axial this moment great to satisfy the length of setting for of guide way. In other embodiments, a retaining pin may be provided on the slip coupling seat and a retaining groove may be provided on the center tube.

Claims (10)

1. The oil pipe anchor comprises a central pipe, wherein slips and a centralizer are arranged on the central pipe;

the central pipe extends along the up-down direction and is sleeved with a slip connecting seat and a slip jacking seat;

the slip connecting seat is sleeved on the central pipe in a guiding manner along the up-down direction, and the slips are connected to the slip connecting seat;

the slip jacking seat is fixed on the central pipe and is provided with a jacking inclined surface which is used for jacking the slips when the slips move towards the slip jacking seat so as to open the slips;

the centralizer is sleeved on the central pipe, is used for elastically jacking against the inner wall of the sleeve and can move up and down relative to the central pipe;

the central pipe is provided with a reversing track groove, the reversing guide rail groove comprises a long groove and a short groove, and the reversing guide groove is matched with the centralizer so as to realize the switching of the centralizer in the guiding along the long groove and the guiding along the short groove;

it is characterized in that the preparation method is characterized in that,

the slip is a guide slip, an inclined guide structure is arranged on the slip jacking seat and used for guiding and assembling the slip on the slip jacking seat along a jacking inclined plane, a radial guide structure is arranged on the slip connecting seat and used for guiding and assembling the slip on the slip connecting seat along the radial direction;

the slip connecting seat is provided with an extreme limit position which is farthest away from the slip jacking seat in an up-and-down moving stroke relative to the central tube, and when the slip connecting seat is positioned at the extreme limit position, one end of the slip, which is far away from the slip connecting seat, is in a state of being contacted with the jacking inclined plane;

the slip connecting seat and the centralizer are arranged in a vertically separated manner;

the length of the short groove satisfies: when the centralizer is positioned at the upper end of the short groove, the slip connecting seat and the centralizer are arranged at intervals in the vertical direction;

the length of the long groove satisfies: when the centralizer is positioned at the upper part of the long groove and continues to move upwards, the centralizer pushes the slip connecting seat to enable the slip connecting seat to push the slips to move upwards and prop the slips to be outwards opened through the slip propping seat, and therefore anchoring of the oil pipe anchor is achieved.

2. The tubing anchor of claim 1, wherein a stop pin is disposed between the slips and the slip shoe, the stop pin limiting the slip shoe when the slip coupling seat is at the extreme limit, such that an end of the slips distal from the slip coupling seat contacts the shoe inclined surface.

3. The tubing anchor of claim 2, wherein the limit pin is disposed on a shoring inclined surface of the slip shoring seat, a limit groove is disposed on an inner side surface of the slip, and the limit pin is used for limiting and matching with an upper end of the limit groove.

4. The tubing anchor of claim 3, wherein the slips are provided with an avoidance hole extending radially through the center tube to avoid the spacer pin when the spacer pin is installed on the slip top prop.

5. The tubing anchor of claim 3, wherein the spacer pin is disposed at a lower portion of the jacking ramp.

6. The tubing anchor of any one of claims 1-5, wherein the slip elements of the slips are columnar structures, and outer end faces of the columnar structures extend obliquely outward from top to bottom.

7. The tubing anchor of claim 6, wherein the slip elements are spaced apart in at least two circumferential rows along the base pipe, each row of slip elements being spaced apart in a plurality along the axial direction of the base pipe.

8. The tubing anchor of any one of claims 1-5, wherein the slanted guide structure is a backstay guide channel having a T-shaped cross-section to form a converging structure for preventing the slips from coming out radially of the base pipe, and wherein the bottom of the backstay guide channel forms the backstay ramp.

9. The tubing anchor of any one of claims 1-5, wherein the radial guide structure is a coupling seat guide groove extending obliquely outward from top to bottom.

10. The tubing anchor of any one of claims 1-5, wherein the slip jacking seat comprises an upper joint and a slip cone, the upper joint is in threaded connection with the upper end of the central tube, the lower end of the upper joint is provided with an inner step, an inner thread is arranged on a vertical step surface of the inner step, an outer step is arranged on the upper end of the slip cone, an outer thread is arranged on a vertical step surface of the outer step, and the outer thread and the inner thread are in screw assembly to realize fixed assembly of the slip cone and the upper joint.

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