CN216381295U - Hydraulic anchor for oil-gas well fishing - Google Patents

Abstract

The utility model relates to the technical field of downhole tools of oil and gas fields, in particular to a hydraulic anchor for salvaging oil and gas wells, which comprises a mandrel, wherein the mandrel is of a hollow circular tubular structure, a mounting groove is formed in the outer peripheral wall of the mandrel along the axial direction of the mandrel, slips are movably arranged in the mounting groove, guide blocks are uniformly arranged on one surface, facing the mounting groove, of each slip, a guide groove matched with each guide block is formed in the inner wall of the mounting groove, and a pushing mechanism is further arranged in the mounting groove and close to the right end and used for pushing the right end of each slip outwards. According to the utility model, the slips are abutted against the inner wall of the casing, and the guide block on the slips is engaged with the guide groove on the mandrel, so that the hydraulic anchor is conveniently fixed.

Description

Hydraulic anchor for oil-gas well fishing

Technical Field

The utility model relates to the technical field of downhole tools of oil and gas fields, in particular to a hydraulic anchor for salvaging oil and gas wells.

Background

At present, in the workover operation of oil gas well, often need take out the tubular column in the pit, and often because of many-sided factors such as scale deposit in the pit, corruption, well body structure, cause the tubular column in the well to be blocked seriously, at this moment, need great freeing the power to extract, should free the power and exceed workover rig or salvage the maximum lifting force of tubular column, and then cause and can't salvage or salvage failure, emergence accident.

In order to smoothly release the pipe string, various releasing devices have been proposed in the prior art, and the existing releasing devices generally include a hydraulic booster and a hydraulic anchor, wherein the hydraulic booster is used for being fixed on the inner wall of the casing pipe, and the hydraulic booster is used for lifting the pipe string. The existing anchor device pushes a slip to be directly contacted with the inner wall of a casing through a piston, and the piston is small in area and not strong in bearing capacity, so that the inner wall of the casing is easily scratched, the piston and the slip are not recycled smoothly, and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a hydraulic anchor for oil and gas well fishing, which is used for solving the problems in the background technology.

The utility model is realized by the following technical scheme: a hydraulic anchor for salvaging oil and gas wells comprises a mandrel, wherein the mandrel is of a hollow circular tubular structure, a mounting groove is formed in the outer peripheral wall of the mandrel in the axial direction of the mandrel, slips are movably arranged in the mounting groove, a guide block in a helical tooth shape is uniformly arranged on the surface, right opposite to the mounting groove, of each slip, a guide groove matched with the guide block is formed in the inner wall of the mounting groove, the guide block and the guide groove are meshed with each other, and a pushing mechanism is further arranged in the mounting groove and close to the right end of the mounting groove and used for pushing the right end of each slip outwards;

the periphery wall of dabber just is located the spacing groove has been seted up to the left end of mounting groove, spacing tooth's socket has been seted up to the surface of slips, the outside of dabber is still overlapped and is equipped with movable cutting ferrule, both ends all are equipped with the holding ring about the internal perisporium of activity cutting ferrule, two the holding ring imbeds respectively in spacing groove and the spacing tooth's socket.

Preferably, the slips are arc sheet-like structures, the thickness of the right end of the slips is larger than that of the left end of the slips, and anti-slip lines are arranged on the outer surface of the right end of the slips.

Preferably, the length of the mounting groove is greater than that of the slip; the width of the limiting groove is larger than that of the positioning ring.

Preferably, the pushing mechanism comprises a pushing piston and an installation panel, the installation panel is fixedly connected to the inner wall of the installation groove through a bolt, an installation hole for installing the pushing piston is further formed in the installation panel, and the pushing piston is movably inserted in the installation hole; the inner wall of the mounting groove is provided with a through hole communicated with the inside of the mandrel in a penetrating mode, and the pushing piston is inserted into the through hole.

Preferably, the pushing piston is of a two-section structure, the diameter of the upper section of the pushing piston is smaller than that of the lower section of the pushing piston, a return spring is sleeved outside the upper section of the pushing piston, and two ends of the return spring are respectively connected with the mounting panel and the upper edge of the lower section of the pushing piston.

Preferably, the inner diameter of the through hole is matched with the outer diameter of the bottom of the pushing piston, and a positioning block is arranged inside the through hole and at one end close to the central shaft of the mandrel and used for blocking the pushing piston from falling into the mandrel.

Compared with the prior art, the utility model provides a hydraulic anchor for oil and gas well salvage, which has the following beneficial effects:

1. according to the utility model, the slips are abutted against the inner wall of the sleeve, and the guide block on the slips is engaged with the guide groove on the mandrel, so that the hydraulic anchor is conveniently fixed;

2. the utility model utilizes pressure to drive the pushing mechanism, and when the pressure in the mandrel disappears, the pushing piston and the slips are automatically recovered, so that the anchoring position is convenient to replace, repeated salvaging is facilitated, and the salvaging success rate is improved.

Drawings

FIG. 1 is a schematic view of a hydraulic anchor according to the present invention;

FIG. 2 is a cross-sectional view of a hydraulic anchor construction of the present invention;

FIG. 3 is an enlarged corresponding view at E in FIG. 2;

fig. 4 is an enlarged corresponding view at F in fig. 2.

In the figure: 1. A mandrel; 2. mounting grooves; 3. slips; 301. a guide block; 302. a limiting tooth socket; 303. anti-skid lines; 4. a pushing mechanism; 401. pushing against the piston; 402. installing a panel; 403. a return spring; 5. a limiting groove; 6. a movable ferrule; 601. a positioning ring; 7. a through hole; 8. and (5) positioning the blocks.

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.

Example (b): referring to fig. 1 to 4, the embodiment provides a hydraulic anchor for fishing an oil and gas well, including a mandrel 1, the mandrel 1 is a circular tubular structure with a hollow interior, mounting grooves 2 are formed on the outer peripheral wall of the mandrel 1 along the axial direction of the mandrel 1, the number of the mounting grooves 2 is several, the mounting grooves 2 are uniformly distributed on the outer peripheral wall of the mandrel 1, slips 3 are movably arranged in the mounting grooves 2, one surface of the slips 3 facing the mounting grooves 2 is uniformly provided with a guide block 301 in a skewed tooth shape, the inner wall of the mounting groove 2 is provided with a guide groove adapted to the guide block 301, and the guide block 301 and the guide groove are engaged with each other; the outer peripheral wall of the mandrel 1 and the left end of the mounting groove 2 are provided with a limiting groove 5, the outer surface of the slip 3 is provided with a limiting tooth groove 302, the outer part of the mandrel 1 is further sleeved with a movable cutting sleeve 6, the left end and the right end of the inner peripheral wall of the movable cutting sleeve 6 are provided with positioning rings 601, the two positioning rings 601 are respectively embedded into the limiting groove 5 and the limiting tooth groove 302, and as shown in fig. 2, the movable cutting sleeve 6 is used for limiting the position of the slip 3 and preventing the slip 3 from falling off from the mounting groove 2; the slips 3 are of arc sheet-shaped structures, the thickness of the right end of the slips 3 is larger than that of the left end of the slips, anti-slip lines 303 are arranged on the outer surface of the right end of the slips 3, and the anti-slip lines 303 are used for improving the friction force between the slips 3 and the inner wall of the sleeve and preventing the slips 3 from slipping on the inner wall of the sleeve; in addition, the length of the mounting groove 2 is greater than that of the slip 3, and the width of the limiting groove 5 is greater than that of the positioning ring 601, so that the slip 3 can slide left and right in the mounting groove 2, and a certain amount of movement is achieved.

A pushing mechanism 4 is further arranged in the mounting groove 2 and close to the right end and used for pushing the right end of the slip 3 outwards; as shown in fig. 3, the pushing mechanism 4 comprises a pushing piston 401 and a mounting panel 402, the mounting panel 402 is fixedly connected to the inner wall of the mounting groove 2 through bolts, the mounting panel 402 is further provided with a mounting hole for mounting the pushing piston 401, and the pushing piston 401 is movably inserted in the mounting hole; a through hole 7 communicated with the inside of the mandrel 1 is formed in the inner wall of the mounting groove 2 in a penetrating manner, and the pushing piston 401 is inserted into the through hole 7; the pushing piston 401 is of a two-section structure, the diameter of the upper section of the pushing piston is smaller than that of the lower section of the pushing piston, a return spring 403 is sleeved outside the upper section of the pushing piston 401, two ends of the return spring 403 are respectively connected with the mounting panel 402 and the upper edge of the lower section of the pushing piston 401, and in the state shown in fig. 3, the return spring 403 is in a compressed state; the inner diameter of the through hole 7 is matched with the outer diameter of the bottom of the pushing piston 401, a positioning block 8 is arranged in the through hole 7 and at one end close to the central shaft of the mandrel 1 and used for blocking the pushing piston 401 from falling into the mandrel 1, therefore, when the pushing piston 401 is not subjected to external force, the bottom end of the pushing piston 401 is abutted against the positioning block 8, and the top end of the pushing piston 401 is in surface contact with the slip 3.

This embodiment is when specifically using, tubular columns such as drilling rod or oil pipe are connected to the left end of dabber 1, and the right-hand member and the booster fixed connection of dabber 1, the booster then links to each other with fishing tool, then utilizes the drilling rod to go into this product well down, and at this moment, the inside of dabber 1 and the hollow channel of booster all keep unblocked, consequently usable rivers circulation well-flushing. After the fishing tool is butted with a pipe column in a well, a sealed space is formed in the hollow channel, water flow is poured into the mandrel 1 from top to bottom, and the slip 3 is pushed outwards and the outer surface of the slip 3 is abutted against the inner wall of the sleeve by pushing the pushing piston 401 outwards along with the increasing pressure in the mandrel 1; simultaneously, because at the salvage in-process, dabber 1 can receive decurrent pulling force, so under the interact of guide block 301 and guide way, can make slips 3 and the more and more tight of sleeve pipe inner wall butt to fine anchoring effect has been realized. When the pressure in the hollow channel disappears, the acting force pushing against the piston 401 disappears, the pushing against piston 401 resets under the action of the return spring 403, and the slips are recovered.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

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 utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The utility model provides an oil gas well is salvaged and is used hydraulic anchor, includes dabber (1), dabber (1) is inside hollow round tubular structure, its characterized in that: the outer circumferential wall of the mandrel (1) is provided with a mounting groove (2) along the axial direction of the mandrel (1), a slip (3) is movably arranged in the mounting groove (2), one surface, facing the mounting groove (2), of the slip (3) is uniformly provided with a guide block (301) in a skewed tooth shape, the inner wall of the mounting groove (2) is provided with a guide groove matched with the guide block (301), the guide block (301) and the guide groove are mutually meshed, and a pushing mechanism (4) is further arranged in the mounting groove (2) and close to the right end and used for pushing the right end of the slip (3) outwards;

the periphery wall of dabber (1) just is located spacing groove (5) have been seted up to the left end of mounting groove (2), spacing tooth's socket (302) have been seted up to the surface of slips (3), the outside of dabber (1) still the cover is equipped with movable cutting ferrule (6), both ends all are equipped with holding ring (601), two about the internal perisporium of activity cutting ferrule (6) holding ring (601) are embedded in respectively in spacing groove (5) and spacing tooth's socket (302).

2. The hydraulic anchor for oil and gas well fishing of claim 1, wherein: slips (3) are arc sheet structure, just the right-hand member thickness of slips (3) is greater than its left end thickness, the right-hand member surface of slips (3) is equipped with anti-skidding line (303).

3. The hydraulic anchor for oil and gas well fishing of claim 1, wherein: the length of the installation groove (2) is greater than that of the slip (3); the width of the limiting groove (5) is larger than that of the positioning ring (601).

4. The hydraulic anchor for oil and gas well fishing of claim 1, wherein: the pushing mechanism (4) comprises a pushing piston (401) and an installation panel (402), the installation panel (402) is fixedly connected to the inner wall of the installation groove (2) through bolts, an installation hole for installing the pushing piston (401) is further formed in the installation panel (402), and the pushing piston (401) is movably inserted in the installation hole; the inner wall of the mounting groove (2) is provided with a through hole (7) communicated with the inside of the mandrel (1) in a penetrating manner, and the pushing piston (401) is inserted into the through hole (7).

5. The hydraulic anchor for oil and gas well fishing of claim 4, wherein: the pushing piston (401) is of a two-section structure, the diameter of the upper section of the pushing piston is smaller than that of the lower section of the pushing piston, a return spring (403) is sleeved outside the upper section of the pushing piston (401), and two ends of the return spring (403) are respectively connected with the mounting panel (402) and the upper edge of the lower section of the pushing piston (401).

6. The hydraulic anchor for oil and gas well fishing of claim 4, wherein: the inner diameter of the through hole (7) is matched with the outer diameter of the bottom of the pushing piston (401), and a positioning block (8) is arranged in the through hole (7) and at one end close to the central shaft of the mandrel (1) and used for blocking the pushing piston (401) from falling into the mandrel (1).

Images