Salvage half-way well cementation drilling-free device

Abstract

The utility model discloses a salvage half-way well cementation drilling-free device which comprises a salvage cylinder, a shell and a lower connector, the shell and the lower connector are connected to the outer side of the salvage cylinder, a closing cavity is formed between the salvage cylinder and the shell, a closing sleeve fixed through a salvage pin is arranged in the closing cavity, and through circulating holes are formed in the shell, the closing sleeve and the salvage cylinder; the inner side of the lower connector is connected with a ball seat through a plug, and the plug and the insertion pipe are locked through a fixing shear pin and an elastic locking block. During operation, the opening pin and the closing pin are sheared off through grading hydraulic pressure, opening and closing of the circulating hole are achieved, after well cementation, the fishing barrel is lifted upwards to trigger elastic contraction of the locking block, the plug and the lower connector are unlocked, and the inner core assembly is lifted out. According to the device, a plug drilling link is omitted, the operation period is shortened, the shaft keeps full bore after fishing, core components are modularly designed to support repeated use, and the device is efficient, environmentally friendly and economical.

Description

Technical Field

[0001] This utility model belongs to the technical field of half-process cementing no-drilling device, specifically relating to a half-process cementing no-drilling device. Background Technology

[0002] With the increasing demand for coalbed methane resource development in my country, the semi-cemented cementing completion process has been widely used due to its adaptability, but significant defects have gradually been exposed in long-term practice. In the existing technology, after cementing is completed, the accessories inside the wellbore need to be removed by drilling plug operation. This process has the following problems: (1) The drilling plug efficiency is low, the construction cycle is prolonged, and it is easy to cause drill cuttings residue, casing damage and falling object risks, which seriously affect the subsequent running of the completion string and the efficiency of gas layer development; (2) Although traditional drill plug-free tools reduce the drilling plug step, their inner diameter is generally smaller than the inner diameter of the casing, forming a "neck-in effect", which restricts the passage of tools such as fracturing and logging in the later stage; (3) Most of the internal components retrieved cannot be reused due to structural damage, resulting in resource waste, which is contrary to the concept of cost reduction and efficiency improvement; (4) The lengthy drilling plug operation exacerbates the safety risks and environmental burden of the well site, which is not in line with the trend of green development.

[0003] Existing patents CN102071902A and CN111663908A disclose optimization of completion tools using soluble materials or recyclable structures, but limitations remain. Incomplete dissolution of soluble components leads to inconsistent inner diameters, or complex designs of retrieval components result in high repair costs. Therefore, there is an urgent need for a semi-cementing, drill-free process that can avoid drilling plug operations, ensure full wellbore duct penetration, and enable component recycling in the completion device. Utility Model Content

[0004] This utility model provides a device for retrieving half-stage cementing without drilling, in order to solve at least one of the above-mentioned technical problems.

[0005] The technical solution adopted by this utility model is as follows: a half-process cementing no-drilling device for retrieval, including a retrieval cylinder and an outer shell and a lower connector on the outside of the retrieval cylinder. A closing cavity is formed between the retrieval cylinder and the outer shell. A closing sleeve is provided in the closing cavity. The closing sleeve is fixed to the retrieval cylinder by a retrieval pin. A through circulation hole is formed on the outer shell, the closing sleeve and the retrieval cylinder. A ball seat is connected to the inner side of the lower connector through a plug. An insertion tube is connected to the plug. An opening plug seat covering the circulation hole is provided inside the retrieval cylinder. The opening plug seat is connected to the insertion tube by an opening pin.

[0006] Preferably, the side of the open plug seat away from the lower connector has a closed plug seat, which is connected to the retrieval cylinder by a closing pin.

[0007] Preferably, the inner diameter of the opening plug is smaller than the inner diameter of the closing plug.

[0008] Preferably, the plug and the insertion tube are connected by a fixing screw, the plug has a locking block, and the outer side of the insertion tube has a locking block groove that cooperates with the locking block.

[0009] Preferably, the plug is connected to the lower connector via the locking block, the locking block having an elastic protrusion that abuts against the outer side of the insertion tube.

[0010] Preferably, the opening pressure of the opening pin is less than the opening pressure of the fixing scissors.

[0011] Preferably, the outer shell is threadedly connected to the lower connector, and the retrieval cylinder is threadedly connected to the insertion tube.

[0012] Preferably, the ball seat has a sealing surface, forming a sealed cavity after the ball is placed on the seat.

[0013] Due to the adoption of the above technical solution, the beneficial effects achieved by this utility model are as follows:

[0014] 1. This utility model features a through-hole circulation hole on the outer shell, closing sleeve, and retrieval tube. In the initial state, the circulation hole is covered by the opening plug, blocking the passage between the inside and outside of the casing. After ball setting, fluid is injected into the sealing cavity, and the pressure is transmitted to the top of the opening plug through the insertion tube. When the pressure reaches the shear strength of the opening pin, the opening pin breaks, and the opening plug loses its fixed constraint with the insertion tube. Under hydraulic drive, the opening plug moves downward along the inner wall of the insertion tube, completely exposing the circulation hole, thereby forming a passage connecting the inside and outside of the casing, achieving drill-free plug cementing.

[0015] 2. This utility model utilizes the engagement of a retaining spring on the closing sleeve with a retaining spring groove on the outer shell. When the closing pin is sheared, the closing plug is hydraulically pushed, causing the closing sleeve to move downwards a certain distance. The circulation hole of the closing sleeve moves downwards with it, axially offset from the circulation holes of the outer shell and the retrieval cylinder, so the three are no longer at the same horizontal position. After the retaining spring on the closing sleeve is embedded in the retaining groove on the outer shell, it fixes the closing sleeve in the offset position, preventing it from rebounding due to pressure fluctuations or vibrations, ensuring permanent blocking effect, completely blocking cement slurry backflow, and completing the cementing operation.

[0016] 3. This utility model uses the locking block on the plug to cooperate with the locking groove of the lower connector. After cementing is completed and the circulation hole is closed, the fishing tool is lowered into the fishing tube and fixed to the fishing tube. When the lifting force reaches the shearing pressure of the fixed shear pin, the shear pin is triggered to break. The insertion tube begins to move upward relative to the plug, causing the locking block to retract and disengage from the locking groove and slide into the locking block groove of the insertion tube. This achieves the disengagement of the plug from the lower connector and the connection of the plug to the insertion tube at the same time. Finally, the fishing tube, insertion tube, ball seat and other core components can be lifted out as a whole, avoiding the problem of diameter reduction caused by residual parts in the well barrel.

[0017] 4. This utility model adopts the pressure of opening the pin < closing the pin < fishing pin < fixing the shear pin, with a pressure gradient difference ≥ 5MPa, to ensure that the circulation hole is opened first, then closed, the closing sleeve is disengaged from the fishing tube, and finally the insertion tube and plug are separated, ensuring that the cementing stage and the fishing stage can be completed smoothly. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 A cross-sectional view of the half-drilling cementing device provided in this embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the first state during the construction of the half-course cementing no-drilling device provided in this embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the second state during the construction of the half-course cementing no-drilling device provided in this embodiment of the utility model;

[0022] Figure 4 A schematic diagram of the third state during the construction of the half-course cementing no-drilling device provided in this embodiment of the utility model;

[0023] Figure 5 A schematic diagram of the fourth state during the construction of the half-course cementing no-drilling device provided in this embodiment of the utility model;

[0024] Figure 6 A schematic diagram of the engagement between the retaining ring and the retaining ring groove during the construction of the half-course cementing no-drilling device provided in this embodiment of the utility model;

[0025] Figure 7 A schematic diagram of the locking block in the half-course cementing no-drill device provided in this embodiment of the utility model;

[0026] Figure 8 This is a cross-sectional schematic diagram showing the cooperation between the locking block, lower connector, plug, and insertion pipe in the half-drilling cementing device provided in this embodiment of the utility model.

[0027] Figure label:

[0028] 1. Salvage tube;

[0029] 2. Outer shell; 201. Snap ring groove;

[0030] 3. Lower connector; 301. Locking groove;

[0031] 4. Closing sleeve; 401. Retrieval pin; 402. Snap ring;

[0032] 5. Close the cavity;

[0033] 6. Plug; 601. Locking block; 602. Fixing screw; 603. Protrusion;

[0034] 7. Insertion tube; 701. Locking block groove;

[0035] 8. Ball seat; 801. Sealing surface;

[0036] 9. Pitching;

[0037] 10. Sealed cavity;

[0038] 11. Open the stopper; 1101. Open the pin;

[0039] 12. Close the plug seat; 1201. Close the pin; 1202. Close the plug; 1203. Close the cavity;

[0040] 14. Improve weaknesses;

[0041] 15. Circulation hole; 1501 First circulation hole; 1502 Second circulation hole; 1503 Third circulation hole. Detailed Implementation

[0042] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0043] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0044] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] like Figure 1 As shown, a retrieval-type drill-free cementing completion device mainly includes a retrieval cylinder 1, an outer shell 2, a lower connector 3, a closing sleeve 4, a plug 6, a insertion tube 7, an opening plug seat 11, and a ball seat 8. The retrieval cylinder 1 is a hollow cylindrical structure, connected to a lifting section 14 on its outer side, and has a first circulation hole 1501 on its inner side. The outer shell 2 is fitted onto the outer side of the retrieval cylinder 1, forming a closing cavity 5 between them. The outer shell 2 also has a third circulation hole 1503. The lower connector 3 is threaded to the lower end of the outer shell 2, and has a locking groove 301 on its inner side that connects to a locking block 601. The closing sleeve 4 is located inside the closing cavity 5 and is fixed to the retrieval cylinder 1 by a retrieval pin 401. The outer side of the closing sleeve 4 has a retaining spring 402, and the inner side of the outer shell 2 has a retaining spring groove 201 that mates with the retaining spring 402. The closing sleeve 4 also has a second circulation hole 1503. The plug 6 is installed inside the lower connector 3 and is fixed to the lower connector 3 by a locking block 601. The front end of the plug 6 is connected to the ball seat 8. The insertion tube 7 is connected to the plug 6 and fixed by a fixing pin. The insertion tube 7 is provided with a locking block groove 701 that cooperates with the locking block 601. The locking block 601 has an elastic protrusion 603, which can abut against the outside of the insertion tube 7 in the initial stage. The opening plug seat 11 is sleeved inside the retrieval tube 1, covering the first circulation hole 1501, and is connected to the insertion tube 7 by an opening pin 1101. The ball seat 8 is located at the front end of the plug 6 and has a sealing surface 801 for receiving the thrown ball 9 to form a sealed cavity 10.

[0048] The above embodiments further include:

[0049] The outer side of the closing sleeve 4 and the inner side of the outer shell 2, and the inner side of the closing sleeve 4 and the outer side of the retrieval tube 1 can be provided with a groove-shaped mating structure to restrict the rotational freedom of the closing sleeve 4, allowing only axial movement of the closing sleeve 4 and preventing misalignment of the retaining spring; the plug 6 and the lower connector 3 can also be provided with a groove-shaped mating structure to restrict the relative rotational freedom of the plug 6 and the lower connector 3 and prevent misalignment of the locking block 601 and the locking groove 701.

[0050] The outer casing 2, the closing sleeve, and the retrieval cylinder 1 all have circulation holes 15, which are directly opposite each other; the diameter of the ball 9 is slightly larger than the inner diameter of the sealing surface 801 of the ball seat 8 to ensure that a seal is formed when the ball 9 sets; the outer diameter of the closing plug 1202 is slightly smaller than the inner diameter of the closing plug seat 12 to avoid jamming when hydraulically pushed; the pressure of opening pin 1101 is less than the pressure of closing pin 1202, less than the pressure of retrieval pin 401, less than the pressure of fixing shear pin 602, and the pressure gradient difference is ≥5MPa, to ensure that the circulation hole 15 is opened first, then closed, the closing sleeve 4 is disengaged from the retrieval cylinder 1, and finally the insertion tube 7 is triggered to separate from the plug 6.

[0051] Its working principle is:

[0052] like Figure 1 As shown, the first step involves connecting the half-section cementing no-drilling device to the casing string via the lifting sub 14 and lowering it into the target well section. A ball dropper 9 is then dropped from the wellhead, falling onto the sealing surface 801 of the ball seat 8, sealing the upper space of the casing and forming a sealing cavity 10.

[0053] like Figure 2 As shown, in the second step, pressure is applied to the sealing cavity 10, and the plug seat 11 is a hydraulic opening structure. After pressure is applied, the pressure on the upper side of the plug seat 11 is higher than that on the lower side, the opening pin 1101 is sheared off, the plug seat 11 moves downward, exposing the circulation hole 15. At this time, the inside and outside of the casing are connected, and the cementing cement begins to circulate.

[0054] like Figure 3 As shown, in the third step, the closing plug 1202 is inserted. The closing plug 1202 is located on the closing plug seat 12, and a closed cavity 1203 is formed above the closing plug. The closed cavity 1203 is pressed further, thereby pushing the closing plug and causing the closing plug seat 12 to cut off the closing pin 1201 and continue to move downward until it reaches the opening plug seat 11.

[0055] like Figure 4 , Figure 6As shown, in the fourth step, pressure continues. Under the action of the locking block 601, the plug 6 remains relatively stationary with respect to the lower connector 3. At this time, the fixing pin 602 between the plug 6 and the insertion tube 7 is cut off, and the retrieval pin 401 between the closing sleeve 4 and the retrieval tube 1 is cut off. The closing plug seat 12 drives the opening plug seat 11, insertion tube 7, retrieval tube 1, and closing sleeve 4 to move downward together. When the closing sleeve 4 moves to the retaining spring groove 201 of the outer shell 2, the retaining spring 402 is embedded into the retaining spring groove 201 through elastic deformation, forming a circumferential constraint to prevent the closing sleeve 4 from moving axially, thus fixing the closing sleeve 4 and the outer shell 2 together. In addition, it also changes the relative position of the closing sleeve 4 and the outer shell 2, so that the second circulation hole 1502 on the closing sleeve 4 and the third circulation hole 1503 on the outer shell 2 are no longer directly opposite each other, thereby closing the circulation hole 15.

[0056] like Figure 8 As shown, during the above operation, the locking block 601 always passes through the plug 6 and connects with the locking groove 301 of the lower connector 3. Since the insertion tube 7 is located inside the plug 6 and its outer side abuts against the locking block 601, radial support can be provided to the locking block 601, allowing the locking block 601 to be stably connected to the locking groove 301. Figure 5 , Figure 7 As shown, when a special retrieval tool is inserted into the retrieval tube 1 and connected to it, it is lifted upwards. At this time, the retrieval tube 1 moves upwards, and the fixing pin 602 connecting the insertion tube 7 and the plug 6 is cut off. The insertion tube 7 begins to move upwards relative to the plug 6. As the insertion tube 7 moves upwards, the locking block groove 701 on its outer side gradually aligns with the locking block 601. Due to the disappearance of the radial support on the outer wall of the insertion tube 7, the locking block 601 retracts inwards under its own elasticity, disengaging from the locking groove 301 of the lower connector 3, thus completing the unlocking. After the locking block 601 retracts, its inner elastic protrusion 603 will partially embed into the locking block groove 701 of the insertion tube 7, so that the insertion tube 7 is connected to the plug 6. Finally, during the upward movement, the retrieval tube 1, along with the insertion tube 7, the plug 6, and the ball seat 8, are retrieved together.

[0057] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0058] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0059] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A half-journey cementing no-drilling device, comprising a retrieval cylinder and an outer shell and a lower connector connected to the outside of the retrieval cylinder, characterized in that, A closing cavity is formed between the retrieval tube and the outer shell. A closing sleeve is provided inside the closing cavity. The closing sleeve is fixed to the retrieval tube by a retrieval pin. A through circulation hole is formed on the outer shell, the closing sleeve, and the retrieval tube. A ball seat is connected to the inner side of the lower connector through a plug. An insertion tube is connected to the plug. An opening plug seat covering the circulation hole is provided inside the retrieval tube. The opening plug seat is connected to the insertion tube by an opening pin.

2. The half-line cementing no-drilling device for retrieval according to claim 1, characterized in that, The side of the open plug away from the lower connector has a closed plug, which is connected to the retrieval cylinder by a closing pin.

3. The half-line cementing no-drilling device for retrieval according to claim 2, characterized in that, The inner diameter of the open stopper is smaller than the inner diameter of the closed stopper.

4. The half-process cementing no-drilling device according to claim 1, characterized in that, The plug and the insertion tube are connected by a fixing screw. The plug has a locking block, and the outer side of the insertion tube has a locking block groove that cooperates with the locking block.

5. The half-process cementing no-drilling device for retrieval according to claim 4, characterized in that, The plug is connected to the lower connector via the locking block, which has an elastic protrusion that abuts against the outside of the insertion tube.

6. The half-process cementing no-drilling device for retrieval according to claim 4, characterized in that, The opening pressure of the opening pin is less than the opening pressure of the fixing pin.

7. The half-line cementing no-drilling device for retrieval according to claim 1, characterized in that, The closing sleeve is equipped with a retaining spring, and the outer casing is provided with a retaining spring groove that mates with the retaining spring.

8. The half-line cementing no-drilling device for retrieval according to claim 1, characterized in that, The outer casing includes a lifting section, which is threadedly connected to the retrieval cylinder, which is threadedly connected to the insertion tube, and the lower connector is threadedly connected to the outer casing.

9. The half-line cementing no-drilling device for retrieval according to claim 1, characterized in that, The ball seat has a sealing surface, which forms a sealed cavity after the ball is placed on the seat.

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