Drilling-free grading hoop

Abstract

The utility model relates to a well cementation downhole tool, and discloses a drilling-free grading hoop which comprises a grading hoop body, an opening plug seat and a second control shear pin, a lifting short section is arranged on the left side of the top of the grading hoop body, an overshot is arranged on the outer side of the grading hoop body, an upper connector is arranged on the right side of the lifting short section, and a second control shear pin is arranged on the upper connector. A first control shear pin is arranged on the middle side of the interior of the fishing barrel, a closing and blocking seat is arranged on the outer side of the grading hoop body, a locking block is arranged on the right side of the interior of the fishing barrel, a closing sleeve is arranged on the right side of the exterior of the fishing barrel, and a clamping spring is arranged in the closing sleeve. According to the utility model, the closing sleeve, the locking block, the opening plug seat, the control shear pin II, the body shell, the closing pin, the grading hoop main body and other structures are matched with one another, so that the operation steps are reduced, the cost is reduced, the well cementation quality is ensured, the operation safety is enhanced, and the grading hoop is suitable for drilling engineering under complex geological conditions; and the overall benefit and reliability of drilling operation are obviously improved.

Description

Technical Field

[0001] The utility model relates to downhole cementing tools, in particular to a non-drilling stage collar. Background Art

[0002] The non-drilling stage collar is an innovative downhole tool designed specifically for stage operations without the need for drilling. By directly connecting to the existing well pipe or casing, and utilizing its unique structure and sealing technology, it can achieve precise stage operations without damaging the existing wellbore. This tool is usually made of high-strength materials and has good compressive and corrosion-resistant properties to ensure stable operation under various complex geological conditions. The use of the non-drilling stage collar significantly reduces the drilling cost and time, and reduces the impact on the environment, especially suitable for maintaining existing oil and gas wells, and operations under geological conditions where drilling is difficult.

[0003] In the prior art, although the non-drilling stage collar performs well in optimizing the drilling operation process, improving efficiency, reducing costs, ensuring cementing quality, enhancing operation safety, and adapting to complex geological conditions, there are still some limitations and challenges. Limited by specific geological characteristics, for some extreme geological conditions, its application effect is not ideal.

[0004] In view of the above problems, a non-drilling stage collar is proposed to solve the above problems. Content of the Utility Model

[0005] In order to make up for the above deficiencies, the utility model provides a non-drilling stage collar, aiming to improve the problems in the prior art that although the non-drilling stage collar performs well in optimizing the drilling operation process, improving efficiency, reducing costs, ensuring cementing quality, enhancing operation safety, and adapting to complex geological conditions, there are still some limitations and challenges. Limited by specific geological characteristics, for some extreme geological conditions, its application effect is not ideal.

[0006] To achieve the above object, the utility model adopts the following technical scheme: A non-drilling stage collar, comprising a stage collar main body, an opening plug seat, and a control shear pin II. A lifting nipple is arranged on the left side of the top of the stage collar main body. A fishing barrel is arranged outside the stage collar main body. An upper sub is arranged on the right side of the lifting nipple. A control shear pin I is arranged in the middle of the fishing barrel. A shut-off seat is arranged outside the stage collar main body. A locking block is arranged on the right side inside the fishing barrel. A closing sleeve is arranged on the right side outside the fishing barrel. A circlip is arranged inside the closing sleeve. A body housing is arranged on the right part outside the stage collar main body. A closing pin is arranged inside the stage collar main body.

[0007] As a further description of the above technical scheme:

[0008] The right end of the lifting sub is arranged on the left side of the closing sleeve.

[0009] As a further description of the above technical solution:

[0010] The right side of the upper sub is arranged at the left end of the body housing.

[0011] As a further description of the above technical solution:

[0012] The closing plug seat is of a conical columnar structure, and a rubber ring is fixedly installed at its thick end.

[0013] As a further description of the above technical solution:

[0014] The main body of the stage collar is of a tubular structure and is provided with circulation holes.

[0015] As a further description of the above technical solution:

[0016] The closing sleeve and the circlip are connected by a card slot.

[0017] As a further description of the above technical solution:

[0018] The opening plug seat is of a conical columnar structure, and a rubber ring is fixedly installed at its thick end.

[0019] As a further description of the above technical solution:

[0020] The closing sleeve and the circlip are matched in size.

[0021] The utility model has the following beneficial effects:

[0022] 1. In the utility model, after the primary cementing is completed, the opening plug seat is opened by applying pressure to the wellhead. Through the action of pressure difference, the opening shear pin is cut off, and the opening plug seat moves downward, exposing the circulation holes for the secondary cementing operation. After the cementing is completed, a closing rubber plug is inserted, and the closing rubber plug moves downward and seats on the closing plug seat. Pressure is applied to the wellhead, the shear pin of the closing plug seat is cut off, and the closing plug seat moves downward while driving the closing sleeve downward to close the circulation holes. A special fishing spear is lowered to fish out the fishing barrel and the closing plug seat from the wellhead. This reduces the operation steps, lowers the cost, ensures the cementing quality, enhances the operation safety, is especially suitable for drilling projects under complex geological conditions, and significantly improves the overall efficiency and reliability of the drilling operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a perspective view of a drill-free stage collar proposed by the utility model;

[0024] Figure 2 is Figure 1 the enlarged view of part A in

[0025] Figure 3For Figure 1 An enlarged view of part B in

[0026] Legend description:

[0027] 1. Lifting nipple; 2. Fishing barrel; 3. Upper sub; 4. Control shear pin I; 5. Closing seat; 6. Circlip; 7. Closing sleeve; 8. Lock block; 9. Opening seat; 10. Control shear pin II; 11. Body shell; 12. Closing pin; 13. Casing collar body. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Referring to Figure 1 - Figure 3 , an embodiment provided by the present invention: a non-drilling casing collar, including a casing collar body 13, an opening seat 9 and a control shear pin II 10. A lifting nipple 1 is provided on the left side of the top of the casing collar body 13. A fishing barrel 2 is provided on the outside of the casing collar body 13. An upper sub 3 is provided on the right side of the lifting nipple 1. A control shear pin I 4 is provided in the middle of the inside of the fishing barrel 2. A closing seat 5 is provided on the outside of the casing collar body 13. A lock block 8 is provided on the right side of the inside of the fishing barrel 2. A closing sleeve 7 is provided on the right side of the outside of the fishing barrel 2. A circlip 6 is provided inside the closing sleeve 7. A body shell 11 is provided on the right part of the outside of the casing collar body 13. A closing pin 12 is provided inside the casing collar body 13.

[0030] Specifically, the grading collar body 13 is the core part of the system, responsible for carrying and transporting substances such as drilling fluid and cement slurry. At the same time, it ensures the liquid circulation through the internal circulation holes, guaranteeing the continuity of the cementing operation. The lifting sub 1 is located at the top left of the grading collar body 13 and is mainly used to connect the drill string. It lifts the grading collar body 13 and the cementing materials inside it to the wellhead or a predetermined position through the lifting force. When it is necessary to carry out the next cementing level, the opening plug seat 9 is acted upon by an external pressure, causing the control shear pins such as the control shear pin two 10 to break. The opening plug seat 9 moves downward, exposing the circulation holes and allowing the injection of the next-level cementing materials. The fishing barrel 2 surrounds the outside of the grading collar body 13, used to collect and process the residues inside the grading collar body 13, and at the same time provides a stable structure for subsequent operations. The upper joint 3 is located on the right side of the lifting sub 1 and is used to connect the drill pipe or other drill string components to form a complete drilling system. The control shear pin one 4 is located in the middle on the inside of the fishing barrel 2. As part of the control of the cementing operation, its integrity directly affects the flow control of the cementing materials. The closing plug seat 5 is used to close the circulation holes after the cementing operation is completed, preventing the continuous inflow of the cementing materials and ensuring the integrity of the cementing operation. The locking block 8 is located on the right side inside the fishing barrel 2 and is used to lock the closing plug seat 5 or other key components to ensure their stability and reliability during the cementing operation. The closing sleeve 7 is used in cooperation with the circlip 6 to form a closed system. When pressure is applied, the closing sleeve 7 and the closing plug seat 5 work together to close the circulation holes, completing the final step of the cementing operation. The body housing 11 wraps around the outside of the grading collar body 13, providing physical protection and enhancing the durability and sealing performance of the system. The closing pin 12 is located inside the grading collar body 13 and serves as a safety control point during the cementing operation to ensure that the circulation holes can be quickly closed under specific conditions to prevent accidents.

[0031] Refer to Figure 1 - Figure 3 , the right end of the lifting sub 1 is arranged on the left side of the closing sleeve 7, the right side of the upper joint 3 is arranged on the left end of the body housing 11. The closing plug seat 5 is a conical columnar structure, and a rubber ring is fixedly installed at its thick end. The grading collar body 13 is a tubular structure and is provided with circulation holes. The closing sleeve 7 and the circlip 6 are connected by a card slot. The opening plug seat 9 is a conical columnar structure, and a rubber ring is fixedly installed at its thick end. The closing sleeve 7 and the circlip 6 are of matching sizes.

[0032] Specifically, the lifting nipple 1 is located at the top left of the stage collar body 13, and its right end is set on the left side of the closing sleeve 7. This component is mainly responsible for connecting the drill string system and lifting the stage collar body 13 and the cementing material inside it to the wellhead or a predetermined position through the lifting force of the rig. It plays a crucial lifting role in the drilling operation. The upper sub 3 is located on the right side of the lifting nipple 1, and its purpose is to connect with the upper part of the drill string to form an integral chain for the drilling operation. It ensures the connection stability and reliability from the surface to the downhole and is an important connecting part in the drilling operation. The closing plug seat 5 is a conical columnar structure, and a rubber ring is fixedly installed at its thick end, which helps to closely contact the wellbore wall when the closing plug seat 5 drops, forming a good sealing effect and preventing the leakage of the cementing material. The function of the closing plug seat 5 is to close the circulation hole after the cementing operation is completed, preventing the continuous inflow of the cementing material and ensuring the integrity of the cementing operation. The stage collar body 13, as the main body of the entire system, is a tubular structure and is provided with circulation holes, which play a crucial role in liquid circulation during the cementing operation, ensuring the smooth injection and discharge of the cementing material. In addition, the design of the circulation holes also facilitates the detection of the cementing quality, ensuring the efficiency and accuracy of the cementing operation. The closing sleeve 7 and the circlip 6 are connected by a card slot, indicating that the closing sleeve 7 can be held in the closed position or the open position by the elastic force of the circlip 6, and can be closed or opened by adjusting the pressure. The function of the closing sleeve 7 is to cooperate with the closing plug seat 5 to form a closed system and close the circulation hole after the cementing operation is completed. The opening plug seat 9 is also a conical columnar structure, and a rubber ring is fixedly installed at its thick end. The opening plug seat 9 plays a crucial role in the conversion stage of the cementing operation. Through the action of external pressure, its shear pins break, and the opening plug seat 9 moves downward, exposing the circulation hole, thus allowing the injection of the next-stage cementing material. The design of the opening plug seat 9 enables the flexible conversion of the cementing operation to adapt to different geological conditions and cementing requirements.

[0033] Working principle: After the first-stage cementing is completed, pressure is applied at the wellhead to open the opening plug seat 9. Through the action of pressure difference, the opening shear pins are cut off, and the opening plug seat 9 moves downward, exposing the circulation hole for the second-stage cementing operation. After the cementing is completed, a closing rubber plug is inserted, and the closing rubber plug moves downward and seats on the closing plug seat 5. Pressure is applied at the wellhead, the shear pins of the closing plug seat 5 are cut off, and the closing plug seat 5 moves downward while driving the closing sleeve 7 downward to close the circulation hole. A special fishing spear is lowered to fish out the fishing barrel 2 and the closing plug seat 5 from the wellhead, and the operation is completed.

[0034] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A non-drilling stage collar, comprising a stage collar body (13), an opening plug seat (9) and a control shear pin II (10), characterized in that: A lifting nipple (1) is provided on the left side of the top of the grading collar body (13). A fishing barrel (2) is provided on the outside of the grading collar body (13). An upper sub (3) is provided on the right side of the lifting nipple (1). A control shear pin I (4) is provided in the middle of the inside of the fishing barrel (2). A closing plug seat (5) is provided on the outside of the grading collar body (13). A locking block (8) is provided on the right side of the inside of the fishing barrel (2). A closing sleeve (7) is provided on the right side of the outside of the fishing barrel (2). A snap ring (6) is provided inside the closing sleeve (7). A body housing (11) is provided on the right part of the outside of the grading collar body (13). A closing pin (12) is provided inside the grading collar body (13).

2. The one - piece drill - free stage collar according to claim 1, wherein: The right end of the lifting nipple (1) is arranged on the left side of the closing sleeve (7).

3. The one-step drill-free grading collar according to claim 1, characterized in that: The right side of the upper sub (3) is arranged on the left end of the body housing (11).

4. A non-drilling stage collar according to claim 1, characterized in that: The closing plug seat (5) is of a conical columnar structure, and a rubber ring is fixedly installed at its thick end.

5. The one - step drill - free grading collar according to claim 1, characterized in that: The grading collar body (13) is of a tubular structure and is provided with circulation holes.

6. The one-step drill-free grading collar according to claim 1, wherein: The closing sleeve (7) and the snap ring (6) are connected by a card slot.

7. The one-step drill-free stage collar according to claim 1, wherein: The opening plug seat (9) is of a conical columnar structure, and a rubber ring is fixedly installed at its thick end.

8. The one-step drill-free stage collar according to claim 1, wherein: The closing sleeve (7) and the snap ring (6) are matched in size.

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