An abrasive jet wellbore cutting system with downhole hydraulic anchoring device

Abstract

The application provides a hydraulic anchoring device matched with an abrasive jet wellbore cutting system, which comprises a rotating conveying shaft and an anchor, wherein the rotating conveying shaft is arranged in the anchor, and the two ends of the rotating conveying shaft protrude outside the anchor; the rotating conveying shaft is rotatably connected with the anchor; at least one layer of anchor claws is arranged on the anchor, each anchor claw is arranged at least partially in the anchor, and each anchor claw is movably connected with the anchor along the radial direction of the anchor; a first hydraulic interface and a second hydraulic interface are arranged on the anchor, and the first hydraulic interface, each layer of anchor claws and the second hydraulic interface are sequentially connected in communication. In the application, the rotating conveying shaft can rotate freely in the anchoring state, and the hydraulic oil and the cutting liquid are completely isolated, so that the risk of sand jamming of the anchor claws caused by solid particles is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of abrasive jet cutting systems for offshore abandoned platforms, and more particularly, to a downhole hydraulic anchoring device for an abrasive jet wellbore cutting system. Background Art

[0002] When a continuous planar cut is formed by cutting the wellbore radially, in field operations, a piston pump such as a fracturing truck is generally used to pressurize the abrasive slurry, and then it is transported to the nozzle through a tubing. The pressure fluctuation of the piston pump and the vibration of the tubing will cause it to be difficult for multiple nozzles to cut a planar gap on the wellbore, but instead form a "wavy line", which will greatly reduce the working efficiency of the abrasive jet cutting system and even lead to cutting failure; to address the above problems, it is required to install a set of anchoring devices in the downhole cutting system that can stably anchor the cutting head in the wellbore. That is, on the one hand, the anchoring device must ensure that the cutting head is basically coaxial with the wellbore and can eliminate the movement of the cutting head relative to the axis direction of the wellbore. At the same time, the central axis of the cutting system rotates in a rotational manner to drive the cutting head (nozzle) to cut the inner surface of the wellbore. This requires the supporting anchoring device to be able to press against the inner wall of the wellbore while the central axis of the anchoring device rotates synchronously with the central axis of the cutting system; existing slips and hydraulic anchors cannot simultaneously meet the above requirements:

[0003] (1) The slips can achieve the free conversion between the two states of "anchoring" - "releasing anchoring" by means of lifting and lowering, but its central axis cannot rotate relative to its housing;

[0004] (2) Generally, the central axis of the hydraulic anchor also cannot rotate relative to its housing. Although the improved structure of the hydraulic anchor can meet the function of the central axis rotation, the extension of its anchor claws is pushed out by the pressure of the working fluid itself. Since the abrasive slurry contains a large amount of fine solid particles such as quartz sand and garnet, once sand jamming occurs at the anchor claws, the anchor claws cannot retract, and the anchoring cannot be released, resulting in a major downhole accident.

[0005] Therefore, existing slips and hydraulic anchors cannot simultaneously meet the requirement of the free rotation of the central axis in the anchored state. Summary of the Invention

[0006] In view of this, the present invention proposes a downhole hydraulic anchoring device for an abrasive jet wellbore cutting system, aiming to solve the problem that existing slips and hydraulic anchors cannot have a rotating central axis in the anchored state.

[0007] This invention proposes a downhole hydraulic anchoring device for an abrasive jet wellbore cutting system. The anchoring device includes a rotary conveying shaft and an anchoring element. The rotary conveying shaft passes through the anchoring element, with both ends protruding from the outside of the anchoring element. These ends connect to the oil pipe and the cutting head of the cutting system, respectively, and convey the abrasive output from the oil pipe to the cutting head. The rotary conveying shaft is rotatably connected to the anchoring element to drive the cutting head to rotate for cutting operations. The anchoring element has at least one layer of anchor claws, each anchor claw being at least partially disposed within the anchoring element. Each anchor claw is connected to the anchoring element in a radially movable manner, forming a hydraulic cylinder structure between the anchor claws and the anchoring element. The anchoring element has a first hydraulic interface and a second hydraulic interface. The first hydraulic interface, each layer of anchor claws, and the second hydraulic interface are sequentially connected to form a differential hydraulic cylinder structure between the layers of anchor claws. This allows the layers of anchor claws to be simultaneously extended and anchored to the inner wall of the wellbore, or simultaneously retracted.

[0008] Furthermore, the above-mentioned abrasive jet wellbore cutting system is equipped with a downhole hydraulic anchoring device. The anchor claws are multi-layered. The first hydraulic interface is connected to the rodless cavity of the first layer of anchor claws. The rod cavity of one layer of anchor claws in two adjacent layers is connected to the rodless cavity of the other layer of anchor claws. In addition, the rod cavity of the last layer of anchor claws is connected to the second hydraulic interface for inputting hydraulic oil, which flows sequentially through the rodless cavity and rod cavity of each anchor claw.

[0009] Furthermore, the above-mentioned abrasive jet wellbore cutting system is equipped with a downhole hydraulic anchoring device. Each layer of the anchor claw has at least three anchor claws, which are distributed in a radiating pattern along the circumference of the anchoring member. Each layer of the anchor claws corresponds to one another. The corresponding anchor claws in each layer are connected to form multiple independent connecting channels.

[0010] Furthermore, the aforementioned abrasive jet wellbore cutting system is equipped with a downhole hydraulic anchoring device, wherein the anchoring component includes: an anchoring body, an upper end cap, and a lower end cap; wherein the upper end cap and the lower end cap are detachably connected to both ends of the anchoring body.

[0011] Furthermore, the aforementioned abrasive jet wellbore cutting system is equipped with a downhole hydraulic anchoring device, wherein the upper end cap is threadedly connected to the upper part of the anchoring body; and / or, the lower end cap is threadedly connected to the lower part of the anchoring body.

[0012] Furthermore, the above-mentioned abrasive jet wellbore cutting system is equipped with a downhole hydraulic anchoring device. The thread direction of the upper part of the anchoring body is opposite to that of the thread direction of the lower part of the anchoring body. In addition, the rotation direction of the rotating conveying shaft is the same as the helical direction at the connection between the upper end cover and the upper part of the anchoring body, and opposite to the helical direction at the connection between the lower end cover and the lower part of the anchoring body.

[0013] Furthermore, the above-mentioned abrasive jet wellbore cutting system is equipped with a downhole hydraulic anchoring device, wherein a set screw is provided between the upper end cover and the anchoring body; and / or, a set screw is provided between the lower end cover and the anchoring body.

[0014] Furthermore, the above-mentioned abrasive jet wellbore cutting system is equipped with a downhole hydraulic anchoring device. The anchoring component is provided with a pressure plate that corresponds one-to-one with the anchor claw. The anchor claw is slidably inserted through the pressure plate, and the pressure plate is used to limit the anchor claw.

[0015] Furthermore, the above-mentioned abrasive jet wellbore cutting system is equipped with a downhole hydraulic anchoring device, wherein a dustproof ring is provided at the connection between the pressure plate and the anchor claw; and / or, a dustproof ring is provided between the rotating conveying shaft and the anchoring component.

[0016] Furthermore, the aforementioned abrasive jet wellbore cutting system is equipped with a downhole hydraulic anchoring device, wherein the end of the anchor claw used for anchoring to the inner wall of the wellbore is provided with an anti-movement structure.

[0017] The abrasive jet wellbore cutting system provided by this invention, along with a downhole hydraulic anchoring device, utilizes a first and second hydraulic interface to create a differential hydraulic cylinder structure between the anchor claws. This allows the anchor claws to be simultaneously extended and anchored to the inner wall of the wellbore, or simultaneously retracted. The extension and retraction of the anchor claws, meaning the transition between "anchoring" and "unanchoring" states, is achieved using hydraulic oil input through the first and second hydraulic interfaces as the medium. This hydraulic oil is completely isolated from the abrasive slurry (cutting fluid) transported by the rotary conveyor shaft, avoiding the risk of anchor claw jamming caused by solid particles. Simultaneously, the rotary conveyor shaft can rotate freely while the anchor claws are anchored, solving the problem that existing slips and hydraulic anchors cannot rotate their central shaft while anchored. This anchoring device also has the following advantages:

[0018] (1) The rotary conveyor shaft is a stepped shaft structure, and bearings are provided at the steps of the stepped shaft. Therefore, the rotary conveyor shaft can rotate the anchoring parts to reduce friction.

[0019] (2) For anchoring requirements of wellbore with different inner diameters, it is only necessary to replace the anchor claws of different lengths to achieve quick results, and the structure has high versatility;

[0020] (3) The magnitude of the anchoring force can be flexibly adjusted by the pressure of the hydraulic oil;

[0021] (4) Differential hydraulic cylinders are formed between the layers of anchor claws, which can basically ensure the synchronization of the extension of each layer of anchor claws. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Also, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0023] Figure 1 is a cross-sectional view of the downhole hydraulic anchoring device supporting the abrasive jet wellbore cutting system provided by the embodiment of the present invention;

[0024] Figure 2 is a hydraulic schematic diagram of the downhole hydraulic anchoring device supporting the abrasive jet wellbore cutting system provided by the embodiment of the present invention;

[0025] Figure 3 is Figure 1 the cross-sectional view at A-A in

[0026] Figure 4 is Figure 1 the cross-sectional view at B-B in

[0027] Figure 5 is Figure 1 the cross-sectional view at C-C in

[0028] Figure 6 is Figure 1 the cross-sectional view at D-D in

[0029] Figure 7 is a cross-sectional view of the local position of the anchor claw provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0031] Refer to Figures 1 to 6, which shows the preferred structure of the downhole hydraulic anchoring device supporting the abrasive jet wellbore cutting system provided by the embodiments of the present invention. As shown in the figure, the anchoring device includes: a rotating conveying shaft 1 and an anchoring member 2; wherein,

[0032] The rotating conveying shaft 1 passes through the anchoring member 2, and both ends of the rotating conveying shaft 1 protrude outside the anchoring member 2, and are used to connect the oil pipe (not shown in the figure) and the cutting head (not shown in the figure) of the cutting system respectively, and convey the abrasive conveyed by the oil pipe to the cutting head. Specifically, threaded structures can be provided at both ends of the rotating conveying shaft 1 (such as the upper and lower ends shown), for example, they can be API standard oil pipe threads, and can be respectively threadedly connected to the oil pipe and the cutting head in the cutting system, that is, connected by screwing; a conveying hole is provided on the rotating conveying shaft 1, and it penetrates through the rotating conveying shaft 1 along the axis of the rotating conveying shaft 1 to form a through-hole structure, that is, a through-hole is provided along the axis direction of the rotating conveying shaft 1, and is used to guide the high-pressure abrasive slurry conveyed by the oil pipe to the cutting head and the nozzle. Figure 1 The rotating conveying shaft 1 is connected to the anchoring member 2 in a rotatable manner, and is used to drive the cutting head to rotate for cutting operations. Specifically, to improve the connection stability between the rotating conveying shaft 1 and the anchoring member 2, preferably, the rotating conveying shaft 1 can be a stepped shaft structure, and bearings are provided at the steps of the stepped shaft, and there can be two of them, namely the first bearing 501 and the second bearing 502 respectively, to ensure that the rotating conveying shaft 1 can rotate relative to the anchoring member 2. Among them, the anchoring member 2 can be a rigid structure. To prevent external solid particles from invading the anchoring device, especially between the rotating conveying shaft 1 and the anchoring member 2, dust-proof rings can be provided between the rotating conveying shaft 1 and the anchoring member 2, and there can be two of them, namely the first dust-proof ring 601 and the second dust-proof ring 602 respectively, which are respectively arranged at the connection and mating positions at the upper and lower ends of the rotating conveying shaft 1 and the anchoring member 2.

[0033] At least one layer of anchor claws is provided on the anchoring member 2, and each anchor claw is at least partially arranged inside the anchoring member, and each anchor claw is connected to the anchoring member 2 in a manner that can move along the radial direction of the anchoring member, and a hydraulic cylinder structure is formed between the anchor claw and the anchoring member 2. Specifically, in this embodiment, the upper and lower two layers of anchor claws are taken as an example for illustration, namely the upper layer anchor claw 7 and the lower layer anchor claw 8; of course, in other embodiments, one layer of anchor claws, three layers of anchor claws or more layers can also be installed on the anchoring member 2, and the number of layers is not limited in this embodiment; preferably, the anchor claws are multiple layers. The setting of multiple layers of anchor claws can make the anchoring member 2 have multiple anchor points along its axial direction compared with one layer, thereby ensuring the firmness of the anchoring of this anchoring device. In this embodiment, each layer of anchor claws has at least three anchor claws and is scattered along the circumferential direction of the anchoring member 2; such as

[0034] At least one layer of anchor claws is provided on the anchoring member 2, and each anchor claw is at least partially arranged inside the anchoring member, and each anchor claw is connected to the anchoring member 2 in a manner that can move along the radial direction of the anchoring member, and a hydraulic cylinder structure is formed between the anchor claw and the anchoring member 2. Specifically, in this embodiment, the upper and lower two layers of anchor claws are taken as an example for illustration, namely the upper layer anchor claw 7 and the lower layer anchor claw 8; of course, in other embodiments, one layer of anchor claws, three layers of anchor claws or more layers can also be installed on the anchoring member 2, and the number of layers is not limited in this embodiment; preferably, the anchor claws are multiple layers. The setting of multiple layers of anchor claws can make the anchoring member 2 have multiple anchor points along its axial direction compared with one layer, thereby ensuring the firmness of the anchoring of this anchoring device. In this embodiment, each layer of anchor claws has at least three anchor claws and is scattered along the circumferential direction of the anchoring member 2; as Figure 3As shown, the upper anchor claw 7 can be three, namely the first upper anchor claw 701, the second upper anchor claw 702, and the third upper anchor claw 703. The first upper anchor claw 701, the second upper anchor claw 702, and the third upper anchor claw 703 are evenly arranged on the anchoring member 2 along the circumference of the anchoring member 2; as shown Figure 5 As shown, the lower anchor claw 8 can be three: a first lower anchor claw 801, a second lower anchor claw 802, and a third lower anchor claw 803. These three lower anchor claws are evenly arranged on the anchoring member 2 along its circumference. In this embodiment, the anchoring member 2 has mounting holes corresponding to the anchor claws. The anchor claws are mounted in the mounting holes in a manner that allows them to move radially along the anchoring member, so that the ends of the anchor claws can extend outside the mounting holes, i.e., outside the anchoring member 2, to achieve anchoring. The arrangement of the anchor claws can be any method, such as a circular arrangement or a spiral arrangement.

[0035] The anchoring element 2 is equipped with a first hydraulic interface 3 and a second hydraulic interface 4. The first hydraulic interface 3, each layer of anchor claws, and the second hydraulic interface 4 are sequentially connected to form a differential hydraulic cylinder structure between each layer of anchor claws. This allows each layer of anchor claws to be simultaneously extended and anchored to the inner wall of the wellbore, or to retract simultaneously. Specifically, the first hydraulic interface 3 and the second hydraulic interface 4 can be located on the upper part of the anchoring element 2 (relative to...). Figure 1 (As shown in the diagram), the first hydraulic interface 3 can be sequentially connected to each layer of anchor claws and the second hydraulic interface 4 to form a connecting channel. Preferably, the first hydraulic interface 3 can be connected to the rodless cavity of the first layer of anchor claws, and the rod cavity of one layer of anchor claws in two adjacent layers of anchor claws can be connected to the rodless cavity of the other layer of anchor claws, so that a differential hydraulic cylinder structure is formed between each layer of anchor claws. Furthermore, the rod cavity of the last layer of anchor claws is connected to the second hydraulic interface 4 for inputting hydraulic oil, which flows sequentially through the rodless cavity and rod cavity of each anchor claw, so that each anchor claw is pushed out and anchored on the inner wall of the wellbore. In this embodiment, the first hydraulic interface 3 can be connected to the rodless cavity of the upper layer of anchor claw 7, and the rod cavity of the upper layer of anchor claw 7 can be connected to the rodless cavity of the lower layer of anchor claw 8, so that the upper layer of anchor claw 7 and the lower layer of anchor claw 8 form a differential hydraulic cylinder structure, and the rod cavity of the lower layer of anchor claw 8 is connected to the second hydraulic interface 4. Both the first hydraulic interface 3 and the second hydraulic interface 4 can be connected to a hydraulic station to pump hydraulic oil through the first hydraulic interface 3. The hydraulic station oil pump pressure can also be adjusted according to the desired anchoring force. The hydraulic oil flows through each layer of anchor claws and the second hydraulic interface 4 in sequence, and then flows back to the hydraulic station through the second hydraulic interface 4 to form a closed-loop circulation system.

[0036] In this embodiment, as Figure 2As shown, each layer of anchor claws corresponds one-to-one, and the corresponding anchor claws in each layer are interconnected to form multiple independent connecting channels. Specifically, the first upper anchor claw 701, the second upper anchor claw 702, and the third upper anchor claw 703 in the upper layer 7 correspond one-to-one with the first lower anchor claw 801, the second lower anchor claw 802, and the third lower anchor claw 803 in the lower layer 8; wherein, the first hydraulic interface 3 forms three branches, which are respectively connected to the rodless cavity of the first upper anchor claw 701, the second upper anchor claw 702, and the third upper anchor claw 703, the rod cavity of the first upper anchor claw 701 is connected to the rodless cavity of the first lower anchor claw 801, and the second upper anchor claw 703 is connected to the rodless cavity of the first lower anchor claw 801, the rod cavity of the first upper anchor claw 701 is connected to the rodless cavity of the first lower anchor claw 801, and the rod cavity of the second upper anchor claw 701 is connected to the rodless cavity of the first lower anchor claw 801, and the rod cavity of the first upper anchor claw 701 is connected to the rodless cavity of the first lower anchor claw 801, and the rod cavity of the second upper anchor claw 702 is connected to the rodless cavity of the first lower anchor claw 803, and the rod cavity of the first upper anchor claw 701 ... The rod-side cavity of the claw 702 is connected to the rodless cavity of the second lower anchor claw 802, and the rod-side cavity of the third upper anchor claw 703 is connected to the rodless cavity of the third lower anchor claw 803. Furthermore, the rod-side cavities of the first lower anchor claw 801, the second lower anchor claw 802, and the third lower anchor claw 803 are respectively connected to the second hydraulic interface 4, so that three independent connecting channels are formed between the first hydraulic interface 3 and the second hydraulic interface 4. In this embodiment, these can be hydraulic oil circuits for oil injection and venting, and can also form a closed-loop circulation.

[0037] See also Figure 1 The anchoring member 2 is provided with pressure plates 9 corresponding to the anchor claws one by one. The anchor claws are slidably inserted through the pressure plates 9, and the pressure plates 9 are used to limit the anchor claws. Specifically, the anchoring member 2 is provided with pressure plates 9 at each mounting hole to seal the mounting hole; and the anchor claws are slidably inserted through the corresponding pressure plates 9. To prevent external solid particles from entering the cavity formed by the anchor claws and the anchoring member 2, i.e., the mounting hole, preferably, a dustproof ring is provided at the connection between the pressure plate 9 and the anchor claw. For example, a third dustproof ring 603 is provided at the connection between each anchor claw in the upper anchor claw 7 and the corresponding pressure plate 9, and a fourth dustproof ring 604 is provided at the connection between each anchor claw in the lower anchor claw 8 and the corresponding pressure plate 9, so as to seal the connection between the pressure plate 9 and the anchor claw and prevent debris from entering the mounting hole. The pressure plate 9 can be fixed to the anchoring member 2 by screws 10. Of course, the pressure plate 9 can also be installed on the anchoring member 2 in other ways, and no limitation is made in this embodiment.

[0038] See also Figure 1 The anchoring component 2 includes: an anchoring body 21, an upper end cap 22, and a lower end cap 23; wherein, the upper end cap 22 and the lower end cap 23 are respectively attached to both ends of the anchoring body 21 (e.g., ...). Figure 1The upper and lower ends (shown) are detachably connected. Specifically, the anchoring body 21, the upper end cover 22, and the lower end cover 23 can be connected by a threaded connection, i.e., a threaded engagement. That is, the upper end cover 22 is threadedly connected to the upper part of the anchoring body 21; and / or, the lower end cover 23 is threadedly connected to the lower part of the anchoring body 21. Of course, they can also be detachably connected in other ways. In this embodiment, to avoid disengagement, preferably, the thread direction of the upper part of the anchoring body 21 is opposite to the thread direction of the lower part of the anchoring body 21. Furthermore, the rotation direction of the rotating conveying shaft 1 is the same as the helical direction at the connection between the upper end cover 22 and the upper part of the anchoring body 21, and opposite to the helical direction at the connection between the lower end cover 23 and the lower part of the anchoring body 21. That is, the rotation direction of the rotating conveying shaft 1 needs to be the same as the thread direction at the connection between the upper end cover 22 and the upper part of the anchoring body 21, and opposite to the thread direction at the connection between the lower end cover 23 and the anchoring body 21. Otherwise, disengagement may occur. To prevent the connection from coming loose, especially the threads from disengaging due to vibration, preferably, a set screw is provided between the upper end cap 22 and the anchoring body 21, such as... Figure 1 The upper set screw 111 is shown; and / or, a set screw is provided between the lower end cap and the anchoring body, such as Figure 1 The set screw 112 is shown.

[0039] In this embodiment, as Figure 1 As shown, both the first hydraulic interface 3 and the second hydraulic interface 4 can be installed on the upper end cover 22. The upper end cover 22 is provided with an upper annular cavity 31 that communicates with the first hydraulic interface 3. The anchoring body 21 can be provided with a middle annular cavity 32 that communicates with the upper annular cavity 31. At the same time, the rodless cavities of each anchor claw in the upper anchor claw 7, such as the first upper anchor claw 701, the second upper anchor claw 702, and the third upper anchor claw 703, are all connected to the middle annular cavity 32. This allows hydraulic oil to be injected through the first hydraulic interface 3 and flow sequentially through the upper annular cavity 31 and the middle annular cavity 32, into the rodless cavities of the first upper anchor claw 701, the second upper anchor claw 702, and the third upper anchor claw 703. This causes the first upper anchor claw 701, the second upper anchor claw 702, and the third upper anchor claw 703 to be slowly pushed out under hydraulic pressure until they press against the inner wall of the wellbore.

[0040] To achieve communication between the rod-bearing cavity of the upper anchor claw 7 and the rodless cavity of the lower anchor claw 8, preferably, the anchoring body 21 is provided with a lower annular cavity 33 located below the middle annular cavity 32 and spaced apart from the middle annular cavity 32. This lower annular cavity 33 is connected to the rodless cavity of the lower anchor claw 8. The anchoring body 21 is also provided with a connecting hole 34 below the upper anchor claw 7, which is connected to the rod-bearing cavity of the upper anchor claw 7, and the connecting hole 34 is also connected to the lower annular cavity 33. In this embodiment, the rodless cavities of each anchor claw in the lower anchor claw 8, namely the first lower anchor claw 801, the second lower anchor claw 802, and the third lower anchor claw 803, are all connected to the lower annular cavity 33. At the same time, the connecting holes 34 correspond one-to-one with the anchor claws in the upper anchor claw 7. For example, there can be three connecting holes 34. Figure 4 As shown, the first connecting hole 3401, the second connecting hole 3402, and the third connecting hole 3403 are respectively connected at their upper ends to the rod-side cavities of the first upper anchor claw 701, the second upper anchor claw 702, and the third upper anchor claw 703, and at their lower ends to the lower annular cavity 33. This allows the first upper anchor claw 701, the second upper anchor claw 702, and the third upper anchor claw 703 to be slowly pushed out under hydraulic pressure. Simultaneously, the hydraulic oil in the rod-side cavities of the first upper anchor claw 701, the second upper anchor claw 702, and the third upper anchor claw 703 enters the lower annular cavity 33 through the first connecting hole 3401, the second connecting hole 3402, and the third connecting hole 3403, and then enters the lower annular cavity 33. Figure 5 The first lower rodless cavity 8011 of the first lower anchor claw 801, the second lower rodless cavity 8021 of the second lower anchor claw 802, and the third lower rodless cavity 8031 ​​of the third lower anchor claw 803, as shown, allow the first lower anchor claw 801, the second lower anchor claw 802, and the third lower anchor claw 803 to be slowly pushed out under hydraulic pressure. The first hydraulic interface 3, the upper annular cavity 31, the middle annular cavity 32, the connecting hole 34, and the lower annular cavity 33 form the first oil passage, allowing hydraulic oil to flow sequentially into the rodless cavity of the lower anchor claw 8.

[0041] In this embodiment, the upper end cover 22 is also provided with an upper connecting hole 41 that communicates with the second hydraulic interface 4; the anchoring body 21 may be provided with a lower connecting hole 42 that communicates with the upper connecting hole 41. Simultaneously, the rod cavity of one of the lower anchor claws 8 communicates with the lower connecting hole 42, and the rod cavities of each anchor claw in the lower anchor claw 8 are connected through diversion holes. For example, the rod cavity of the first lower anchor claw 801 communicates with the lower connecting hole 42. Figure 1 and Figure 6As shown, the rod-shaped cavities of the first lower anchor claw 801, the second lower anchor claw 802, and the third lower anchor claw 803 are respectively provided with a first diversion hole 4301, a second diversion hole 4302, and a third diversion hole 4303 below the first lower anchor claw 801, the second lower anchor claw 802, and the third lower anchor claw 803. The anchoring body 21 may be provided with an annular cavity at the axial position below the lower anchor claw 8. The annular cavity and the rotating conveying shaft 1 form an oil cavity 44, which is connected to each diversion hole 43, so that when the rod-shaped cavity of one anchor claw in the lower anchor claw 8 changes, it drives the other anchor claws to change, so that all anchor claws in the lower anchor claw 8 extend or retract simultaneously. Among them, the second hydraulic interface 4, the upper connecting hole 41, the lower connecting hole 42, and the diversion hole 43 form a second oil circuit.

[0042] In this embodiment, as Figure 7 As shown, each anchor claw is used to anchor to the end of the wellbore inner wall that has an anti-movement structure (such as...). Figure 7 An anti-axial movement structure 12 is provided on the left end (as shown) to ensure that the contact point between the anchor claw and the inner wall of the wellbore has sufficient anti-axial movement capability. Specifically, the anti-axial movement structure 12 can be a toothed structure or other structures, such as a striped structure or a dotted structure; in this embodiment, the anti-axial movement structure 12 is a plurality of toothed structures arranged in parallel, and its tooth tip angle α can be 90° or other angle values, and no limitation is made on it in this embodiment.

[0043] The abrasive jet wellbore cutting system, equipped with a downhole hydraulic anchoring device, can be installed on the abrasive jet cutting system of an offshore abandoned platform. The working process of the anchoring device is as follows: anchoring, cutting, retraction, and movement, as detailed below:

[0044] Anchoring Process: Before using the hydraulic anchoring device, oil must first be injected and air vented from the first and second oil circuits. The upper end of the rotating conveyor shaft 1 is connected to the oil pipe via a screw-on connection, and its lower end is connected to the cutting head via a screw-on connection. The first hydraulic interface 3 and the second hydraulic interface 4 are connected to the hydraulic station on the ground (or platform deck) via high-pressure hoses. The connected tool string is placed inside the wellbore to be cut and lowered to the designated position. Hydraulic oil is then pumped into the first hydraulic interface 3 via the ground hydraulic station (the pump pressure can be adjusted according to the desired anchoring force). The hydraulic oil sequentially passes through the first hydraulic interface 3, the upper annular cavity 31, the first bearing 501, and the middle annular cavity 32 into the rodless cavity of the upper anchor claw 7, namely the rodless cavity of the first upper anchor claw 701, the rodless cavity of the second upper anchor claw 702, and the third upper anchor claw 702. In the rodless cavity of the upper anchor claw 703, the first upper anchor claw 701, the second upper anchor claw 702, and the third upper anchor claw 703 are slowly pushed out under hydraulic pressure until they press against the inner wall of the wellbore. At the same time, the hydraulic oil in the rod cavity of the upper anchor claw 7 enters the rodless cavity of the lower anchor claw 8 through the connecting hole 34 and the lower annular cavity 33. The lower anchor claw 8 is also slowly pushed out under hydraulic pressure. Since the rod cavity of the upper anchor claw 7 and the rodless cavity of the lower anchor claw 8 are connected, a differential hydraulic cylinder is formed, and the two have the same area. Therefore, the extension rate of the upper and lower anchor claws is consistent, which can ensure the synchronicity of the anchoring of the upper and lower anchor claws. At the same time, the hydraulic oil in the rodless cavity of the lower anchor claw 8 returns to the hydraulic station through the diversion hole 43, the lower connecting hole 42, the upper connecting hole 41, and the second hydraulic interface 4, forming a closed-loop system.

[0045] Cutting process: After both the upper and lower anchor claws are anchored to the inner wall of the wellbore, the rotary drive system in the cutting system is turned on. The oil pipe connected to the upper part of the rotary conveyor shaft 1 will drive it to rotate synchronously. At the same time, the rotary conveyor shaft 1 will drive the cutting head at its lower part to rotate synchronously. Since both the upper and lower anchor claws are anchored to the inner wall of the wellbore, and the first bearing 501 and the second bearing 502 are installed at the upper and lower steps of the rotary conveyor shaft 1, the rotation of the rotary conveyor shaft 1 and the anchoring of the upper and lower anchor claws do not interfere with each other. The high-pressure abrasive slurry transported from the oil pipe enters the cutting head connected to its lower end through the through hole of the rotary conveyor shaft 1 to carry out the cutting operation.

[0046] Retraction process: After the cutting operation is completed, the rotary drive system is turned off, and the rotary conveyor shaft 1 stops rotating; the oil pump connected to the first hydraulic interface 3 of the ground hydraulic station is turned off, and the oil pump connected to the second hydraulic interface 4 is turned on. The hydraulic oil then enters the rod chamber of the lower anchor claw 8 through the second hydraulic interface 4, the upper connecting hole 41, and the lower connecting hole 42. It first enters the rod chamber of the first lower anchor claw 801, such as... Figure 5As shown, the hydraulic oil then enters the oil chamber 44 through the first diversion hole 4301, and then enters the rod chambers of the second lower anchor claw 802 and the third lower anchor claw 803 through the second diversion hole 4302 and the third diversion hole 4303 respectively. Under the action of hydraulic pressure, the three lower anchor claws slowly retract. At the same time, the hydraulic oil in the rodless chambers of the three lower anchor claws enters the rod chamber of the upper anchor claw through the lower annular cavity 33, the first connecting hole 3401, the second connecting hole 3402 and the third connecting hole 3403, pushing the three upper anchor claws to retract. The hydraulic oil in the upper anchor claws then returns to the ground hydraulic station through the middle annular cavity 32, the first bearing 501, the upper annular cavity 31 and the first hydraulic interface 3 in sequence, forming a closed loop.

[0047] Movement process: After the upper and lower anchor claws have retracted, lower the anchoring device to the next cutting position and repeat the above process.

[0048] In summary, the abrasive jet wellbore cutting system and downhole hydraulic anchoring device provided in this embodiment, through the setting of the first and second hydraulic interfaces, forms a differential hydraulic cylinder structure between each layer of anchor claws. This allows each layer of anchor claws to be simultaneously extended and anchored to the inner wall of the wellbore, or simultaneously retracted. In other words, the extension and retraction of the anchor claws, and the transition between the "anchoring" and "unanchoring" states, utilizes hydraulic oil input through the first and second hydraulic interfaces 3 as the medium. This hydraulic oil is completely isolated from the abrasive slurry (cutting fluid) transported by the rotary conveyor shaft 1, avoiding the risk of anchor claw jamming caused by solid particles. Simultaneously, in the anchored state, the rotary conveyor shaft 1 can rotate freely, solving the problem that existing slips and hydraulic anchors cannot rotate their central shaft in the anchored state. This anchoring device also has the following advantages:

[0049] (1) The rotary conveyor shaft 1 is a stepped shaft structure, and a bearing is provided at the step of the stepped shaft. Therefore, the rotary conveyor shaft 1 can rotate the anchor 2 to reduce friction.

[0050] (2) For anchoring requirements of wellbore with different inner diameters, it is only necessary to replace the anchor claws of different lengths to achieve quick results, and the structure has high versatility;

[0051] (3) The anchoring force can be flexibly adjusted by the pressure of the hydraulic oil;

[0052] (4) Differential hydraulic cylinders are formed between the anchor claws of each layer, which can basically ensure the synchronicity of the extension of the anchor claws of each layer.

[0053] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate the direction or positional relationship, are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0054] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A hydraulic downhole anchoring device for use with an abrasive jet wellbore cutting system, comprising: The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. 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The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a cutting system of an abrasive jet wellbore. The application relates to a hydraulic anchoring device for a A dustproof ring is arranged between the rotating conveying shaft and the anchor.

7. The hydraulic anchor assembly for abrasive jet wellbore cutting systems of any of claims 1-3, wherein, The anchor claw is provided with an anti-channeling structure for anchoring on the end of the inner wall of the wellbore.

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