Soluble fluke hydraulic anchor

Abstract

The utility model relates to the field of oil and gas field downhole tool technology and construction operation, in particular to a soluble fluke hydraulic anchor. The hydraulic anchor comprises a body (1), a pressing ring (2), a spring (3), an O-shaped sealing ring (4) and a soluble anchor fluke (5). And three rows of stepped holes for mounting the soluble anchor flukes (5) and three rows of uniformly distributed quicksand grooves are uniformly distributed on the circumference of the body (1). During underground operation, pumping pressure is provided in an oil pipe to push the soluble anchor flukes (5) to further compress the springs (3) to extend out in the radial direction, and the springs (3) are meshed with the wall of a sleeve to anchor a pipe column; no impurity enters the pressure ring (2) and the soluble anchor fluke (5) in a matched operation process, so that the action is not influenced; after the operation is finished, the pressure relief soluble anchor fluke (5) in the oil pipe is withdrawn under the acting force of the spring (3); a soluble anchor body (502) part in the soluble anchor fluke (5) is automatically dissolved in well liquid after a certain period of time, and the problem that a conventional hydraulic anchor pipe column is blocked is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil and gas field downhole tool technology and construction operation field especially relates to a kind of soluble anchor claw hydraulic anchor. BACKGROUND

[0002] Hydraulic anchor, as a key downhole operation tool, plays a crucial role in the oil and gas industry. It is widely used in oil (gas) well hydraulic fracturing, water injection modification, hydraulic sandblasting, cutting (or sandblasting perforation), oil testing, oil production, water finding, water blocking and other operations. Its core function is to effectively limit the axial displacement of downhole tools through the tight engagement of anchor claw and casing wall, thereby overcoming the problem of pipe string creep in separate layer operation and preventing the pipe string from moving unexpectedly due to various complex forces in the well. This ensures the smooth progress of downhole operation and the normal operation of the tool. After the construction is completed, the hydraulic anchor can be normally recovered, so as to ensure that there is no jamming problem in the process of later pipe column lifting.

[0003] However, in actual application, the use of conventional hydraulic anchor may encounter some challenges and problems. For example, the normal operation of anchor claw and body may be affected by impurities jamming, which is usually caused by insufficient cleanliness of the well fluid or material, causing impurities to enter the gap between anchor claw and body, hindering the normal movement of anchor claw. In addition, if the pressure is insufficient or the pressure relief is not complete, the anchor claw will not work normally. The existence of these problems not only affects the performance of hydraulic anchor, but also may have a negative impact on the safety and efficiency of the entire downhole operation.

[0004] In terms of friction between anchor claw and well wall, the friction may be too large due to pressure changes or anchor claw embedding too deep into the well wall. When the release machine is used, the anchor claw may be jammed or the spring may fail, which will affect the normal operation of the hydraulic anchor. Especially during fracturing construction, fracturing sand may enter the casing annulus from the tubing and deposit in the groove of the conventional hydraulic anchor body, causing it to be unable to be recovered. In sand-producing oil wells, formation sand is easy to enter the anchor claw cavity or gap of the hydraulic anchor, which not only hinders the movement of the anchor claw, but also may cause the anchor claw to be unable to extend or retract normally, even causing the pipe string to be jammed, seriously affecting the operation efficiency and safety. Therefore, in view of these problems, the design and material of hydraulic anchor need to be improved to improve its adaptability and reliability in complex downhole environment.

[0005] On April 13, 2025, a search was conducted in the China Patent Publication Database with "anchor claw and soluble and water and spring" as the abstract keyword, and the synonym expansion option was checked. No relevant literature was found.

[0006] On April 13, 2025, an abstract search was conducted on China National Knowledge Infrastructure with "anchor pawl and soluble and water and spring" as the search terms, and no relevant literature was found.

[0007] On April 13, 2025, a search was conducted on the United States Patent and Trademark Office website with "anchor pawl with soluble with water with spring" as the search terms, and no relevant literature was found; the search website is https: / / ppubs.uspto.gov / pubwebapp / .

[0008] On April 13, 2025, a search was conducted on WIPO's https: / / patentscope2.wipo.int / with "anchor pawl and soluble and water and spring" as the search terms, and no relevant literature was found. The three documents retrieved are not related to this patent. 1. 191118288 Improvement of or relating to an underwater mine; 2. 190513092 Improvement of or relating to an underwater mine; 3. 374411 Precision system for regulating the sinking of block torpedoes;

[0009] On April 13, 2025, a search was conducted on the Japanese Patent Office website https: / / www.j-platpat.inpit.go.jp / with "anchor pawl and soluble and water and spring" as the search terms, and no relevant literature was found.

[0010] Completely different from the concept of this patent. Content of the utility model

[0011] The utility model aims at providing a soluble anchor pawl hydraulic anchor with better effect, and specific purposes are seen in multiple substantial technical effects in the specific implementation part.

[0012] In order to achieve the above-mentioned purposes, the utility model adopts the following technical solutions:

[0013] A soluble anchor pawl hydraulic anchor, characterized in that,

[0014] The soluble anchor pawl hydraulic anchor comprises a body 1, and more than one stepped hole is arranged on the body 1 for installing a soluble anchor pawl 5;

[0015] A compression ring 2 can be installed in the stepped hole, the outer diameter of the compression ring 2 is provided with threads, the top end of the compression ring 2 is arc-shaped and is threadedly connected with the stepped hole of the body 1 to constrain the soluble anchor pawl 5, and the arc at the top end of the compression ring 2 and the outer diameter of the body 1 form a concentric circle;

[0016] The inner wall of the pressure ring 2 comprises a spring hole for installing the spring 3;

[0017] The spring 3 is a helical compression spring, and the spring 3 is in a compressed state when installed; the compressed state enables the soluble anchor 5 to be in a correct installation position;

[0018] Further compression during operation enables the pressure in the body to make the soluble anchor 5 extend, and the soluble anchor 5 can be retracted under the action of the spring 3 after pressure relief;

[0019] The O-shaped sealing ring 4 is installed at the sealing groove of the soluble anchor 5, and is used for sealing the fitting surface of the soluble anchor 5 and the stepped hole of the body 1;

[0020] The soluble anchor 5 is a combined part composed of a shell 501 and a soluble anchor body 502.

[0021] The further technical scheme of the utility model further relates to that the two ends of the body 1 are connected to the upper and lower operation pipe columns through standard oil pipe threads.

[0022] The further technical scheme of the utility model further relates to that the shell of the body 1 is provided with a flowing sand groove, and the flowing sand groove can penetrate through the upper and lower shell.

[0023] The further technical scheme of the utility model further relates to that three rows of stepped holes for installing the soluble anchor 5 and three rows of flowing sand grooves are uniformly arranged on the circumference of the body 1.

[0024] The further technical scheme of the utility model further relates to that the soluble anchor body 502 is made of a soluble material that can be dissolved in well fluid.

[0025] The further technical scheme of the utility model further relates to that the pump pressure provided in the oil pipe drives the soluble anchor to further compress the spring and extend radially, and the soluble anchor can be anchored to the pipe column by being engaged with the casing wall.

[0026] The further technical scheme of the utility model further relates to that the end of the soluble anchor body 502 comprises a friction surface.

[0027] The further technical scheme of the utility model further relates to that after the operation is completed, the pressure relief in the oil pipe enables the soluble anchor to be retracted under the action of the spring.

[0028] The utility model discloses a body two ends are the standard oil pipe thread and the operation pipe column upper and lower connection, and the body circumference is provided with three rows of step holes and installs three rows of even sand groove of soluble anchor claw. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to further illustrate the present application, further description is made below in conjunction with the drawings:

[0030] Figure 1 It is the structural schematic diagram of the utility model;

[0031] Figure 2 It is the three-dimensional drawing of the utility model;

[0032] Figure 3 It is the three-dimensional drawing of the utility model;

[0033] Figure 4 It is the three-dimensional drawing of the soluble anchor claw of the utility model;

[0034] Figure 5 It is the result schematic diagram of Figure 1

[0035] Figure 6 It is the perspective view of the invention's compression ring;

[0036] Figure 7 It is the side schematic diagram of the invention's compression ring;

[0037] Figure 8 It is the local structure enlarged view of Figure 3

[0038] In the drawing: 1, body, 2, compression ring, 3, spring, 4, O-shaped sealing ring, 5, soluble anchor claw, 6. sand groove. DETAILED DESCRIPTION

[0039] ​​The utility model is further illustrated below in combination with the drawings and specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the utility model and not to limit the scope of the utility model. In the description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom" and the like is based on the orientation or position relationship shown in the drawings, and is only used to facilitate the description of the utility model and simplify the description, and therefore cannot be understood as a limitation on the utility model. In addition, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or internal connection of two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0040] It should be noted that in this paper, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0041] The present patent provides a variety of parallel schemes, and different expressions belong to improved schemes or parallel schemes based on the basic scheme. Each scheme has its own unique characteristics. In addition, the technical features involved in the different embodiments of the invention described below can be combined with each other as long as there is no conflict between them. The fixing mode not expressed in the text can be any one of the fixing modes such as screw fixing, bolt fixing or glue bonding.

[0042] Embodiment one: in combination with all the drawings; a soluble anchor claw hydraulic anchor, characterized in that,

[0043] The soluble anchor claw hydraulic anchor comprises a body 1, and more than one stepped hole is arranged on the body 1 for mounting the soluble anchor claw 5;

[0044] The stepped hole can be installed with a compression ring 2, the outer diameter of which is provided with threads, and the top end of the compression ring 2 is arc-shaped and threadedly connected with the stepped hole of the body 1 to constrain the soluble anchor claw 5, and the arc at the top end of the compression ring 2 forms a concentric circle with the outer diameter of the body 1;

[0045] The inner wall of the compression ring 2 contains a spring hole for installing a spring 3;

[0046] The spring 3 is a helical compression spring, and the spring 3 is in a compressed state when installed; the compressed state makes the soluble anchor claw 5 in the correct installation position;

[0047] During work, further compression allows the pressure in the body to make the soluble anchor claw 5 extend, and after pressure relief, the soluble anchor claw 5 can be retracted under the action of the spring 3;

[0048] The O-shaped sealing ring 4 is installed at the sealing groove of the soluble anchor claw 5, and is used to seal the mating surface of the soluble anchor claw 5 and the stepped hole of the body 1;

[0049] The soluble anchor claw 5 is a combination of a shell 501 and a soluble anchor body 502.

[0050] The technical solution of the present application has the following substantial technical effects and implementation process, i.e., basic functions:

[0051] During work, further compression allows the soluble anchor claw 5 to extend, and after pressure relief, the soluble anchor claw 5 can be retracted under the action of the spring 3;

[0052] The O-shaped sealing ring 4 is installed at the sealing groove of the soluble anchor claw 5, and is used to seal the mating surface of the soluble anchor claw 5 and the stepped hole of the body 1;

[0053] The soluble anchor claw 5 is a combination of a shell 501 and a soluble anchor body 502.

[0054] The body 1 is uniformly provided with three rows of sand flow grooves, and sand caused by incomplete sand production, fracturing or well washing in the local formation can be smoothly discharged through the sand flow grooves, avoiding the obstruction of sand particles to the anchor claw during unblocking, so that the anchor claw cannot be retracted smoothly, resulting in the pipe string being stuck;

[0055] The soluble anchor claw 5 is a combination of a shell 501 and a soluble anchor body 502, and in the case of non-recovery of the anchor claw in an extreme case, the soluble anchor body 502 can be dissolved in the well fluid, avoiding the problem of pipe string sticking of the conventional hydraulic anchor;

[0056] The body 1 is connected with the operation pipe column through the standard oil pipe thread at both ends. Three rows of stepped holes are arranged on the circumference of the body 1 to install the soluble anchor claw 5. The O-shaped sealing ring 4 is sleeved on the soluble anchor claw 5 to realize sealing with the mounting hole on the body 1. The spring 3 is sleeved on the soluble anchor claw 5, and the compression ring 2 is screwed into the hole of the body 1 to compress the spring 3, so that the soluble anchor claw 5 is in the correct installation position. At this time, the compression ring 2, the body 1 and the soluble anchor claw 5 form a relatively closed environment, avoiding the problem of impurities entering the exposed gap of the conventional hydraulic anchor and the compression strip and the spring.

[0057] Embodiment two: as a further improved scheme or a parallel scheme or an alternative independent scheme, the body 1 is connected with the operation pipe column through the standard oil pipe thread at both ends. The essential technical effect and the implementation process of the technical scheme in the embodiment are as follows: the embodiment provides a specific connection relationship, and similar structures that need to be anchored are within the protection scope of the patent.

[0058] Embodiment three: as a further improved scheme or a parallel scheme or an alternative independent scheme, the shell of the body 1 is arranged with a flow sand groove, and the flow sand groove can penetrate through the shell up and down. The essential technical effect and the implementation process of the technical scheme in the embodiment are as follows: when the sand in the formation, the sand caused by incomplete fracturing or well washing, can be smoothly discharged through the flow sand groove, avoiding the hindering of the anchor claw by the sand particles during the unblocking, so that the pipe column is not stuck.

[0059] Embodiment four: as a further improved scheme or a parallel scheme or an alternative independent scheme, three rows of stepped holes are arranged on the circumference of the body 1 to install the soluble anchor claw 5 and three rows of flow sand grooves. The essential technical effect and the implementation process of the technical scheme in the embodiment are as follows: the number of rows is similar and is within the protection scope of the patent.

[0060] Embodiment five: as a further improved scheme or a parallel scheme or an alternative independent scheme, the soluble anchor body 502 is made of a soluble material that can be dissolved in the well fluid. The essential technical effect and the implementation process of the technical scheme in the embodiment are as follows: the material preferably has a certain deformation ability; a mesh structure can also be used, which is made of a metal with elasticity and filled with a water-soluble material. The soluble material can also adopt the following scheme: the soluble anchor body is made of a high-strength soluble magnesium-aluminum alloy, which has good machining performance. The high-strength soluble magnesium-aluminum alloy material reacts with water to dissolve, and the dissolution rate of the magnesium-aluminum alloy is mainly related to the liquid temperature and the chloride ion concentration. The higher the temperature, the faster the dissolution. According to the construction needs, the formula can be changed to effectively anchor and dissolve in a certain environment.

[0061] Embodiment six: as a further improved scheme or parallel scheme or alternative independent scheme, the pump pressure provided in the oil pipe pushes the further compressed spring of the soluble anchor claw to extend radially, and the soluble anchor claw is engaged with the casing wall to anchor the pipe string.

[0062] Embodiment seven: as a further improved scheme or parallel scheme or alternative independent scheme, the end of the soluble anchor body 502 comprises a friction surface. The essential technical effect and implementation process of the technical scheme herein and the basic function are as follows: the friction surface makes the anchoring more stable.

[0063] Embodiment eight: as a further improved scheme or parallel scheme or alternative independent scheme, after the operation is completed, the pressure in the oil pipe is released to enable the soluble anchor claw to retract under the action of the spring.

[0064] In general: the utility model relates to oil and gas field downhole tool technology and construction operation field, especially relate to a kind of soluble anchor claw hydraulic anchor. The hydraulic anchor includes body 1, compression ring 2, spring 3, O-shaped sealing ring 4, soluble anchor claw 5;Body 1 both ends are standard oil pipe thread and operation pipe string upper and lower connection, body 1 is evenly distributed and is provided with three rows of stepped holes installation soluble anchor claw 5 and three rows of even sand groove. Soluble anchor claw 5 is combined piece shell 501, and sealing groove is provided on the shell 501, and O-shaped sealing ring 4 is installed, and the installation hole on body 1 is sealed, and soluble anchor body 502 is installed and fixed in the counterbore of shell 501;Spring 3 is sleeved on soluble anchor claw 5, and compression ring 2 is screwed into the hole of body 1 to compress spring 3, so that soluble anchor claw 5 is in correct installation position;When downhole operation, pump pressure is provided in the oil pipe to push soluble anchor claw 5 to further compress spring 3 to extend radially, and the pipe string is anchored by engaging with the casing wall;Compression ring 2 and soluble anchor claw 5 cooperate during operation, and no impurities enter to affect its action;After operation is completed, the pressure in the oil pipe is released, and soluble anchor claw 5 retracts under the action of spring 3;Soluble anchor body 502 in soluble anchor claw 5 is automatically dissolved in well fluid after a certain period of time, and the problem of conventional hydraulic anchor pipe string jamming is avoided.

[0065] Pioneeringly, the above various effects exist independently, and the combination of the above results can also be completed by using a set of structures.

[0066] It should be noted that the multiple schemes provided by the patent include the basic scheme itself, are independent of each other, and do not restrict each other, but they can also be combined with each other without conflict,

[0067] The above shows and describes the basic principle, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principle of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application. The changes and improvements all fall within the scope of protection.

Claims

1. A dissolvable anchor hydraulic anchor, characterized in that, The body (1) is provided with more than one stepped hole for installing the dissolvable anchor (5); The compression ring (2) is installed in the stepped hole, the outer diameter of the compression ring (2) is provided with threads, the top end of the compression ring (2) is arc-shaped and threadedly connected with the stepped hole of the body (1) to constrain the dissolvable anchor (5), and the arc at the top end of the compression ring (2) and the outer diameter of the body (1) form a concentric circle; The inner wall of the compression ring (2) is provided with a spring hole for installing the spring (3); The spring (3) is a helical compression spring, and the spring (3) is in a compressed state when installed; the compressed state makes the dissolvable anchor (5) in the correct installation position; During operation, further compression allows the pressure in the body to make the dissolvable anchor (5) extend, and after pressure relief, the dissolvable anchor (5) can be retracted under the action of the spring (3); The O-shaped sealing ring (4) is installed in the sealing groove of the dissolvable anchor (5) to seal the mating surface of the dissolvable anchor (5) and the stepped hole of the body (1); The dissolvable anchor (5) is a combined component composed of a shell (501) and a dissolvable anchor body (502).

2. A dissolvable fluke hydraulic anchor as claimed in claim 1 wherein, The two ends of the body (1) are standard tubing threads connected to the upper and lower working string.

3. A dissolvable fluke hydraulic anchor as claimed in claim 1 wherein, The shell of the body (1) is provided with a flow sand groove, and the flow sand groove can pass through the shell up and down.

4. A dissolvable fluke hydraulic anchor as claimed in claim 3 wherein, The body (1) is provided with three rows of stepped holes and three rows of flow sand grooves uniformly distributed around the circumference.

5. A dissolvable fluke hydraulic anchor as claimed in claim 1, wherein, The dissolvable anchor body (502) is made of a dissolvable material that can be dissolved in well fluid.

6. A dissolvable fluke hydraulic anchor as claimed in claim 1 wherein, The pump pressure provided in the tubing pushes the dissolvable anchor to further compress the spring and extend radially, and the dissolvable anchor engages with the casing wall to anchor the string.

7. A dissolvable fluke hydraulic anchor as claimed in claim 1 wherein, The end of the dissolvable anchor body (502) is provided with a friction surface.

8. A dissolvable fluke hydraulic anchor as claimed in claim 1 wherein, After the operation is completed, the pressure in the tubing is released to allow the dissolvable anchor to retract under the action of the spring.

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