Bidirectional repeated anti-stuck unlocking anchor

Abstract

The application relates to a bidirectional repeated anti-stuck unlocking anchor, which comprises a first anchoring mechanism; the first anchoring mechanism comprises a butt joint, a reduced diameter sleeve, a split head, an upper cone, a central pipe, a first slip, a first slip seat, the upper cone is partially sleeved on the outer wall of an anchor body, the first slip seat is fixedly installed on the outer wall of the anchor body, the first slip is fixedly connected with the first slip seat and the upper cone respectively, one end of the split head is fixedly connected with the upper cone, the butt joint is sleeved on the outer wall of the anchor body, the reduced diameter sleeve is fixed on the outer wall of the anchor body, the split head and the upper cone are axially installed with a first spring in the space formed by the anchor body; a plurality of split parts are formed on one end of the split head in an axial direction, a pawl is formed on the outer wall of the split part, the pawl is located in the reduced diameter sleeve at an initial moment, a groove is arranged on the inner wall of the butt joint, the split part of the split head can be taken out of the reduced diameter sleeve, and the pawl is clamped into the groove; the anchor overcomes the problem of unidirectional slip anchoring of the existing anchor, and simultaneously has the function of forcibly recovering the slip.

Description

Technical Field

[0001] This invention belongs to the field of oilfield well workover operations, and particularly relates to a bidirectional repeatable anti-jamming and unlocking anchor. Background Technology

[0002] Currently, the casing repair processes used in well workover all have their own drawbacks. Casing repair is difficult, and issues such as stuck pipe and reshaping failure can occur, even causing damage to the casing. By developing mechanical and hydraulic variable-diameter ball bearing shapers, a wider reshaping range and higher reshaping efficiency can be achieved. The hydraulic casing ball bearing shaper is a further upgrade of the mechanical ball bearing shaper technology. The hydraulic variable-diameter ball bearing shaper converts liquid pressure into mechanical force, which acts on the variable-diameter ball bearing expander to radially expand and roll the deformed casing, rolling it back to a round shape and restoring it to a larger diameter. This does not sacrifice casing thickness; it simply expands and rounds the indented and bent casing. The hydraulic variable diameter ball bearing forming process tubing consists of a variable diameter ball bearing expansion head, a hydraulic booster, and an anchor. Hydraulic pressure is supplied from the ground to compress and expand the diameter of the deformed casing, automatically depressurize, and perform multiple forming operations. The anchor used in this process consists of multiple hydraulic anchors connected in series. After forming one section, the anchor needs to be unsealed before forming the next section. In this case, there is a risk of the hydraulic anchors getting stuck. Based on the above field requirements, it is necessary to study an anchor that has both bidirectional anchoring and forced slip recovery. Summary of the Invention

[0003] The technical problem solved by this invention is achieved through the following technical solution:

[0004] A bidirectional repeatable anti-jamming and unlocking anchor includes an anchor body, on which a first anchoring mechanism is installed;

[0005] The first anchoring mechanism includes a connector, a reducing sleeve, a split head, an upper cone, a central tube, a first slip, and a first slip seat. The upper cone is fitted onto the outer wall of the anchor body. The first slip seat is fixedly installed on the outer wall of the anchor body. The first slip is installed on the first slip seat, and its other end is fixedly connected to the upper cone. One end of the split head is fixedly connected to the upper cone. The connector is fitted onto the outer wall of the anchor body. The reducing sleeve is fixed onto the outer wall of the anchor body, and the reducing sleeve is located between the connector and the anchor body. A first spring is axially installed in the space formed by the split head, the upper cone, and the anchor body.

[0006] The splitting head forms several segments axially at one end, and claws are formed on the outer wall of the segments. The claws are initially located inside the reducing sleeve. The inner wall of the coupling head is provided with a groove. When the coupling head moves towards the upper cone, the coupling head pushes the splitting head to move and compresses the first spring, causing the first slip to anchor the sleeve. Finally, the segments of the splitting head disengage from the reducing sleeve, and the claws engage in the groove.

[0007] Furthermore, it also includes a second anchoring mechanism, which is installed on the downstream outer wall of the anchor body. The second anchoring mechanism anchors before the first anchoring mechanism, and the second anchoring mechanism can also automatically unseal after the first anchoring mechanism is unsealed.

[0008] Furthermore, the second anchoring mechanism includes a second slip, a second slip seat, a base, and a housing. The second slip seat is sealed on the outer wall of the anchor body. The base is fixed to the outer wall of the anchor body by a pin. Both ends of the housing are fixedly connected to the second slip seat and the base, respectively. The second slip is installed on the second slip seat, and its other end is fixedly connected to the outer wall of the anchor body. An intermediate clamp is also fixedly installed on the outer wall of the anchor body. The intermediate clamp, the second slip seat, the outer wall of the anchor body, and the housing form a sealed space. A water eye is provided on the anchor body corresponding to the sealed space. A second spring is installed between the intermediate clamp and the base.

[0009] Furthermore, the anchor body includes an upper central tube, a central tube, a lower cone, and a lower central tube that are fixedly connected from top to bottom.

[0010] Furthermore, it also includes an upper connector and a connecting sleeve. The two ends of the connecting sleeve are fixedly connected to the upper connector and the butt connector, respectively. The connecting sleeve is movably connected to the upper central tube, and the two can move axially relative to each other.

[0011] Furthermore, one end of the central tube is fixedly connected to the outer wall of the upper central tube, one end of the upper cone is sleeved on the central tube, and the first spring is located in the space formed by the central tube, the upper central tube, the upper cone, and the split head.

[0012] Furthermore, the upper cone can move axially relative to the central tube, and when the upper cone moves, it can push the first slip and anchor the sleeve to complete the setting seal.

[0013] Furthermore, the lower connector is fixedly connected to the end of the lower central tube;

[0014] Furthermore, the claws that engage with the split head within the groove on the inner wall of the connector can retract radially under the constraint of the reducing sleeve.

[0015] The advantages and positive effects of this invention are:

[0016] The bidirectional repeatable anti-jamming and unlocking anchor of the present invention can largely overcome the problem of unidirectional jamming of existing anchors, and at the same time has the function of forced recovery of jamming slips, solving the problem of anchors jamming pipe columns, and achieving the purpose of hydraulic variable diameter ball bearings for multiple reshaping. Attached Figure Description

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless specifically indicated, these drawings are intended only to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the structure of a bidirectional repeatable anti-jamming unlocking anchor provided in an embodiment of the present invention;

[0019] Figure 2 This is a front view of the split head of a bidirectional repeatable anti-jamming unlocking anchor provided in an embodiment of the present invention;

[0020] Figure 3 yes Figure 2 The left view;

[0021] Figure 4 This is a critical state at which a bidirectional repeating anti-jamming unlocking anchor begins to compress, as provided in an embodiment of the present invention.

[0022] Figure 5 This is a critical state at which a bidirectional repeating anti-jamming unlocking anchor begins to unseal and release, as provided in an embodiment of the present invention. Detailed Implementation

[0023] First, it should be noted that the specific structure, features, and advantages of the present invention will be described in detail below by way of examples. However, all descriptions are for illustrative purposes only and should not be construed as limiting the present invention in any way. Furthermore, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the accompanying drawings, can still be arbitrarily combined or deleted among these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned herein. Additionally, for the sake of simplifying the drawings, the same or similar technical features may be indicated only in one place in the same drawing.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0026] like Figure 1 , Figure 2 , Figure 3 As shown, this embodiment provides a bidirectional repeatable anti-jamming unlocking anchor, which includes an anchor body. The anchor body includes an upper central tube 3, a central tube 9, a lower cone 12, and a lower central tube 16 that are fixedly connected from top to bottom. The lower central tube 16 is fixedly connected to a lower connector 22 at its end.

[0027] A first anchoring mechanism is installed on the outer wall of the anchor body. Specifically, the first anchoring mechanism includes a connector 4, a reducing sleeve 5, a split head 6, an upper cone 7, a central tube 9, a first slip 10, and a first slip seat 11. The upper cone 7 is partially fitted onto the outer wall of the anchor body. The first slip seat 11 is fixedly installed on the lower cone 12. The first slip 10 is installed on the first slip seat 11, and its other end is fixedly connected to the upper cone 7. One end of the split head 6 is fixedly connected to the upper cone 7. The connector is fitted onto the outer wall of the anchor body, and the reducing sleeve 5 is fixed to the outer wall of the anchor body. The reduced-diameter sleeve 5 is located between the connector and the anchor body. A first spring 8 is axially installed in the space formed by the split head 6, the upper cone 7, and the anchor body. Specifically, one end of the central tube 9 is fixedly connected to the outer wall of the upper central tube 3, one end of the upper cone 7 is sleeved on the central tube 9, and a gap is formed between the other end of the upper cone 7 and the upper central tube. The first spring 8 is located in the space formed by the central tube 9, the upper central tube 3, the upper cone 7, and the split head 6. The upper cone 7 can move axially relative to the central tube 9, and when the upper cone 7 moves, it can push the first slip 10 to anchor the sleeve and complete the setting seal.

[0028] One end of the splitting head 6 forms several segments 601 axially, and claws 602 are formed on the outer wall of the segments. It should be noted that the segments 601 have a certain elasticity in the radial direction and can contract radially. The other end of the splitting head 6 is fixedly connected to one end of the upper cone 7 by threads. The claws of the splitting head 6 are initially located inside the reducing sleeve 5. The inner wall of the connecting head 4 is provided with a groove 401. When the connecting head 4 moves towards the upper cone 7, the connecting head 4 pushes the splitting head 6 to move and compresses the first spring, causing the first slip 10 to anchor the sleeve. Finally, the segments of the splitting head 6 disengage from the reducing sleeve 5, and the claws are engaged in the groove. It should be noted that the claws of the splitting head 6 engaged in the groove on the inner wall of the connecting head 4 can contract radially under the constraint of the reducing sleeve 5.

[0029] It also includes a second anchoring mechanism, which is installed on the downstream outer wall of the anchor body. The second anchoring mechanism anchors before the first anchoring mechanism. After the first anchoring mechanism is unsealed, the second anchoring mechanism can also be automatically unsealed.

[0030] Specifically, the second anchoring mechanism includes a second slip 13, a second slip seat 14, a base 19, and a housing 20. The second slip seat 14 is sealed on the outer wall of the anchor body. The base 19 is fixed on the outer wall of the anchor body by a pin 21. The housing 20 is a sleeve-shaped structure, with its two ends fixedly connected to the second slip seat 14 and the base 19, respectively. The second slip 13 is fixedly installed on the second slip seat 14, and its other end is fixedly connected to the lower cone 12. An intermediate clamp 17 is also fixedly installed on the outer wall of the anchor body. The intermediate clamp 17, the second slip seat 14, the outer wall of the anchor body, and the housing 20 form a sealed space. A water eye 15 is provided on the anchor body corresponding to the sealed space. A second spring 18 is installed between the intermediate clamp 17 and the base 19.

[0031] In addition, in order to facilitate the anchoring and setting of the first slip 10 and the sleeve by pressing down the butt joint 4, it is possible to include an upper joint 1 and a connecting sleeve 2. The two ends of the connecting sleeve 2 are fixedly connected to the upper joint 1 and the butt joint 4 respectively. The connecting sleeve 2 is movably connected to the upper central tube 3, and the two can move axially relative to each other.

[0032] In practical use, such as Figure 4 , Figure 5As shown, liquid pressure is applied to the inside of the anchor. High-pressure liquid enters the sealed space formed by the intermediate clamp 17, the second slip seat 14, the outer wall of the anchor body, and the shell 20 through the water hole 15. The high-pressure liquid pushes the second slip seat 14 and the shell 20 to move, thereby shearing the pin 21 and setting the second slip 13. The second slip 13 is anchored to the inner wall of the casing. Using the second slip 13 as a fulcrum, the upper connector 1, the connecting sleeve 2, and the mating connector 4 move downward together to push the first slip 10 to anchor to the casing and complete the setting. At this time, the split head 6 disengages from the reducing sleeve 5 and enters the groove of the mating connector 4. When it is necessary to unseal the anchor, the tubing is lifted, and the groove of the mating connector 4 pulls the split head 6. The split head 6 further forcibly pulls the upper cone 7, the first slip 10 is retracted, and the second slip 13 is retracted under the action of the second spring 18, completing the unsealing. At this time, the split head 6 can be radially contracted under the constraint of the reducing sleeve 5 and leaves the groove of the mating connector 4.

[0033] The specific steps for using the bidirectional repeatable anti-jamming unlocking anchor of the present invention are as follows:

[0034] 1. After the bidirectional repeatable anti-sticking unlocking anchor is lowered to the predetermined position along with the tubing string, it is raised about 1 meter away from the distance between the tubing hanger and the wellhead. The ground pipeline is connected to the pump truck and pressure is started. Under the action of internal liquid pressure, the bidirectional repeatable anti-sticking unlocking anchor pushes the second slip seat 14 to move along with the housing 20, thereby shearing the pin 21 to set the second slip 13. The second slip 13 is anchored to the inner wall of the casing.

[0035] 2. Using the second slip 13 as a fulcrum, lower the tubing hanger about 1 meter away from the wellhead to set the tubing hanger. The upper connector 1, connecting sleeve 2, and butt connector 4 move downward together to push the first slip 10 to anchor the casing and complete the setting. At this time, the split head 6 and the reducing sleeve 5 disengage and enter the groove of the butt connector 4.

[0036] 3. When it is necessary to unseal the anchor, lift the tubing, and pull the split head 6 out of the groove of the connector 4. The split head 6 is further forcibly pulled up the upper cone 7. The first slip 10 is retracted, and the second slip 13 is retracted under the action of the second spring 18, thus completing the unsealing. At this time, the split head 6 can be radially retracted under the constraint of the reducing sleeve 5 and leave the groove of the connector 4.

[0037] The above embodiments have provided a detailed description of the present invention, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A bidirectional repeatable anti-jamming unlocking anchor, characterized in that: Includes an anchor body, on which a first anchoring mechanism is installed; The first anchoring mechanism includes a connector, a reducing sleeve, a split head, an upper cone, a central tube, a first slip, and a first slip seat. The upper cone is fitted onto the outer wall of the anchor body. The first slip seat is fixedly installed on the outer wall of the anchor body. The first slip is installed on the first slip seat, and its other end is fixedly connected to the upper cone. One end of the split head is fixedly connected to the upper cone. The connector is fitted onto the outer wall of the anchor body. The reducing sleeve is fixed onto the outer wall of the anchor body, and the reducing sleeve is located between the connector and the anchor body. A first spring is axially installed in the space formed by the split head, the upper cone, and the anchor body. The splitting head forms several segments axially at one end, and claws are formed on the outer wall of the segments. The claws are initially located inside the reducing sleeve. The inner wall of the coupling head is provided with a groove. When the coupling head moves towards the upper cone, the coupling head pushes the splitting head to move and compresses the first spring, causing the first slip to anchor the sleeve. Finally, the segments of the splitting head disengage from the reducing sleeve, and the claws are engaged in the groove. It also includes a second anchoring mechanism, which is installed on the downstream outer wall of the anchor body. The second anchoring mechanism anchors before the first anchoring mechanism. After the first anchoring mechanism is unsealed, the second anchoring mechanism can also be automatically unsealed. The second anchoring mechanism includes a second slip, a second slip seat, a base, and a housing. The second slip seat is sealed on the outer wall of the anchor body. The base is fixed to the outer wall of the anchor body by a pin. Both ends of the housing are fixedly connected to the second slip seat and the base, respectively. The second slip is installed on the second slip seat, and its other end is fixedly connected to the outer wall of the anchor body. An intermediate clamp is also fixedly installed on the outer wall of the anchor body. The intermediate clamp, the second slip seat, the outer wall of the anchor body, and the housing form a sealed space. A water eye is provided on the anchor body corresponding to the sealed space. A second spring is installed between the intermediate clamp and the base. The claws that engage with the split head within the groove on the inner wall of the connector can retract radially under the constraint of the reducing sleeve.

2. The bidirectional repeatable anti-jamming unlocking anchor according to claim 1, characterized in that: The anchor body includes an upper central tube, a central tube, a lower cone, and a lower central tube, which are fixedly connected from top to bottom.

3. The bidirectional repeatable anti-jamming unlocking anchor according to claim 2, characterized in that: It also includes an upper connector and a connecting sleeve. The two ends of the connecting sleeve are fixedly connected to the upper connector and the butt connector, respectively. The connecting sleeve is movably connected to the upper central tube, and the two can move axially relative to each other.

4. The bidirectional repeatable anti-jamming unlocking anchor according to claim 2, characterized in that: One end of the central tube is fixedly connected to the outer wall of the upper central tube, and one end of the upper cone is sleeved on the central tube. The first spring is located in the space formed by the central tube, the upper central tube, the upper cone, and the split head.

5. The bidirectional repeatable anti-jamming unlocking anchor according to claim 2, characterized in that: The upper cone can move axially relative to the central tube, and when the upper cone moves, it can push the first slip and anchor the sleeve to complete the setting seal.

6. The bidirectional repeatable anti-jamming unlocking anchor according to claim 2, characterized in that: The lower connector is fixedly connected to the end of the lower central tube.

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