Falling half-stroke well cementation drilling-free device

Abstract

The utility model relates to the technical field of drilling-free devices, and discloses a falling half-stroke well cementation drilling-free device which comprises an upper connector, a lower connector is fixedly connected to one side of the upper connector, a closing sliding sleeve is slidably connected to the inner wall of the lower connector, a center pipe is slidably connected to the inner wall of the closing sliding sleeve, and a lower connecting sleeve is slidably connected to the inner wall of the center pipe. The outer wall of the lower connecting sleeve is slidably connected with a lower sliding sleeve, the outer wall of the lower sliding sleeve is attached to the inner wall of the lower connector, the inner wall of the lower connecting sleeve is slidably connected with an opening plug seat, and one side of the lower sliding sleeve is fixedly connected with a ball seat face. According to the drilling-free device, equipment is sealed through the sealing ball, the opening plug seat, the lower connecting sleeve and the center pipe are pushed by air pressure to respectively cut off the opening pin, the drilling-free pin and the shearing pin, so that the center pipe, the lower connecting sleeve and the lower sliding sleeve fall to the well bottom under the influence of gravity, and the drilling-free plug effect is achieved; and compared with traditional equipment, the efficiency and the safety of well cementation operation are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of drilling-free equipment technology, and in particular to a drilling-free cementing equipment that allows for partial drop cementing. Background Technology

[0002] The drop-in cementing tool is an advanced device for cementing operations in oil and gas drilling, designed to improve the efficiency and safety of cementing operations. In traditional cementing operations, temporary plugging devices in the well are typically removed after cementing by drilling or removing the material. This process is not only time-consuming but also damages the wellbore structure, increasing operational risks. To address this problem, the drop-in cementing tool was developed.

[0003] In existing technologies, cementing operations typically use drillable bridge plugs or drillable packers as temporary sealing devices. These devices are mainly made of composite materials or aluminum alloys and contain multiple shear pins and sealing elements. After cementing is completed, the bridge plug or packer needs to be drilled out using drilling tools to restore wellbore patency. The mechanical structure of existing technologies typically includes components such as an upper connecting sleeve, a central tube, sealing elements, and shear pins. Their working principle involves external pressure or mechanical force driving the shear pins to break, causing some components of the device to fall or separate, thereby achieving the sealing function.

[0004] Although existing technologies have played an important role in cementing operations, certain problems still exist. After cementing is completed, temporary plugging devices need to be removed through drilling operations. This process is not only time-consuming, but also damages the wellbore structure and increases operational risks. To address these issues, a drop-half cementing no-drill device is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a half-drill cementing tool that improves the problem that after cementing, it is necessary to remove the temporary sealing device through drilling operations. This process is not only time-consuming, but also damages the wellbore structure and increases the risk of operation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A half-drilling cementing tool includes an upper connector, a lower connector fixedly connected to one side of the upper connector, a closing sleeve slidably connected to the inner wall of the lower connector, a central tube slidably connected to the inner wall of the closing sleeve, a lower connecting sleeve slidably connected to the inner wall of the central tube, a lower sliding sleeve slidably connected to the outer wall of the lower connecting sleeve, the outer wall of the lower sliding sleeve fitting against the inner wall of the lower connector, an opening plug seat slidably connected to the inner wall of the lower connecting sleeve, and a ball seat surface fixedly connected to one side of the lower sliding sleeve.

[0008] As a further description of the above technical solution:

[0009] The central tube has multiple circulation channels inside, which extend through the closed sliding sleeve to the inside of the main body shell. The circulation channels are used to provide circulation for cementing operations.

[0010] As a further description of the above technical solution:

[0011] The inner wall of the closing sleeve is fixedly connected with a plurality of shear pins, which are arranged in a ring array inside the closing sleeve.

[0012] As a further description of the above technical solution:

[0013] The shear pin engages with the interior of the central tube, and the shear pin is used to limit the position of the central tube.

[0014] As a further description of the above technical solution:

[0015] Multiple locking blocks are fixedly connected inside the lower sliding sleeve, and the locking blocks are arranged in a ring array inside the lower sliding sleeve.

[0016] As a further description of the above technical solution:

[0017] The locking block engages with the interior of the lower connector, and the locking block is used to connect and fix the lower sleeve and the lower connector.

[0018] As a further description of the above technical solution:

[0019] The lower sleeve is internally fixedly connected with multiple drill-free pins, which engage with the interior of the lower connecting sleeve.

[0020] As a further description of the above technical solution:

[0021] Multiple opening pins are fixedly connected inside one side of the lower connecting sleeve, and the opening pins are engaged with the inside of the opening plug seat.

[0022] This utility model has the following beneficial effects:

[0023] In this invention, the equipment is sealed by a sealing ball, and air pressure is used to push the opening plug seat, lower connecting sleeve and central tube to cut the opening pin, drill-free pin and shear pin respectively. The central tube, lower connecting sleeve and sliding sleeve fall to the bottom of the well under the influence of gravity, achieving the effect of drill-free plug. Compared with traditional equipment, the efficiency and safety of cementing operations are greatly improved. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of a half-stroke cementing drillless device proposed in this utility model;

[0025] Figure 2 This is a schematic diagram of the cross-sectional structure of the outer shell of a half-stroke cementing drillless device proposed in this utility model;

[0026] Figure 3 This is a schematic diagram of the lower connector structure of a half-stroke cementing drillless device proposed in this utility model.

[0027] Legend:

[0028] 1. Upper connector; 2. Shear pin; 3. Body housing; 4. Closing slide sleeve; 5. Circulation channel; 6. Central tube; 7. Opening plug seat; 8. Opening pin; 9. Lower connecting sleeve; 10. Drill-free pin; 11. Locking block; 12. Lower sliding sleeve; 13. Lower connector; 14. Ball seat surface. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Reference Figures 1-3This utility model provides an embodiment of a half-stroke cementing no-drilling device, comprising an upper connector 1, a lower connector 13 fixedly connected to one side of the upper connector 1, a closing sleeve 4 slidably connected to the inner wall of the lower connector 13, the closing sleeve 4 controlling the opening and closing of the circulation channel 5 to achieve effective fluid circulation during cementing operations, a central tube 6 slidably connected to the inner wall of the closing sleeve 4, the central tube 6 enabling it to withstand high pressure and provide sufficient strength during operation, a lower connecting sleeve 9 slidably connected to the inner wall of the central tube 6, a lower sliding sleeve 12 slidably connected to the outer wall of the lower connecting sleeve 9, the outer wall of the lower sliding sleeve 12 fitting against the inner wall of the lower connector 13 to ensure the stability and sealing of the component during operation, an opening plug seat 7 slidably connected to the inner wall of the lower connecting sleeve 9, the opening plug seat 7 being used to open the circulation channel 5 for operation when needed, a ball seat surface 14 fixedly connected to one side of the lower sliding sleeve 12, the ball seat surface 14 receiving the sealing ball, thereby forming a good sealing effect in the early stage of operation, multiple circulation channels 5 are opened inside the central tube 6, extending through the closing sleeve 4 to the outside of the main body. Inside the shell 3, the circulation channel 5 provides a channel for cementing operations, ensuring that the working fluid can circulate effectively and remove impurities from the well. Multiple shear pins 2 are fixedly connected to the inner wall of the closing sleeve 4. These shear pins 2 are arranged in a ring array inside the closing sleeve 4, and their main function is to limit the position of the central tube 6, ensuring that it will not move unexpectedly during pressurization. The shear pins 2 engage with the interior of the central tube 6, enhancing the stability of the structure. Multiple locking blocks 11 are fixedly connected inside the lower sleeve 12. These locking blocks 11 are arranged in a ring array inside the lower sleeve 12, and engage with the interior of the lower connector 13, used to connect and fix the lower sleeve 12 and the lower connector 13, ensuring the reliability of the entire structure during operation. Multiple drill-free pins 10 are fixedly connected inside the lower sleeve 12, and these drill-free pins 10 engage with the interior of the lower connecting sleeve 9. Multiple opening pins 8 are fixedly connected to one side of the lower connecting sleeve 9, and these opening pins 8 engage with the interior of the opening plug seat 7, used to quickly unlock the opening plug seat 7 during operation.

[0031] Specifically, during the operation of the drop-type drill-free grading collar, the upper connector 1 and lower connector 13 of the tool are tightly connected through the casing to ensure that the tool can be smoothly lowered to the designed position. At the start of the operation, the sealing ball must first be inserted to ensure the sealing of subsequent operations. Then, the pumping system is started to send the sealing ball to the ball seat surface 14 of the tool's lower sleeve 12 and form a complete seal. In this state, the lower sleeve 12 is firmly fixed to the lower connector 13 by the locking block 11 to ensure that there will be no loosening or displacement during the subsequent pressure increase. As the pressure continues to rise, the opening plug 7 inside the tool begins to move under the action of hydraulic pressure, shearing the opening pin 8, thereby smoothly opening the circulation channel 5 to meet the requirements of cementing operations. The cycle requires that after the cycle operation is completed, the closing rubber plug is put in again to ensure that the rubber plug is accurately located inside the upper end of the opening plug seat 7 to achieve an effective sealing effect. Then, through the pressurization operation, the drill-free pin 10 is successfully sheared, causing the central tube 6 and the lower connecting sleeve 9 to descend together and releasing the locking block 11. At this time, the central tube 6, through the action of the shearing pin 2, further pushes the closing sliding sleeve 4 downward, quickly closing the circulation channel 5, thereby stopping the cycle operation. Then, pressurization is applied again to cause the central tube 6 to shear the shearing pin 2, so that the central tube 6, the lower connecting sleeve 9, and the sliding sleeve 12 immediately enter a free state. Finally, under the action of gravity, they fall to the bottom of the well, successfully achieving the purpose of the drill-free plug and ensuring the efficiency and safety of the operation.

[0032] Working Principle: During the operation of the drop-type drill-free grading clamp, the upper connector 1 and lower connector 13 of the tool are tightly connected by a sleeve to ensure that the tool can be smoothly lowered to the designed position. At the start of the operation, the sealing ball is first inserted, and then the pumping system is started to send the sealing ball to the ball seat surface 14 of the lower sleeve 12 of the tool, forming a sealed state. At this time, the lower sleeve 12 is firmly fixed to the lower connector 13 by the locking block 11 to ensure that it will not loosen during the subsequent pressure increase. As the pressure continues to rise, the opening plug seat 7 in the tool begins to move under the action of hydraulic pressure, shearing the opening pin 8, thereby opening the circulation channel 5, realizing... The circulation required for cementing operations is completed. After the circulation is finished, the closing rubber plug is put in to ensure that it is located inside the upper end of the opening plug seat 7, thereby forming an effective seal. Next, by pressurizing, the no-drill pin 10 is sheared, causing the central tube 6 and the lower connecting sleeve 9 to descend together, releasing the locking block 11. At this time, the central tube 6, through the action of the shearing pin 2, further pushes the closing sliding sleeve 4 downward, closing the circulation channel 5, thereby stopping the circulation operation. Then, pressurizing is applied again to shear the shearing pin 2, so that the central tube 6, the lower connecting sleeve 9, and the sliding sleeve 12 are in a free state and fall to the bottom of the well, achieving the purpose of no-drill plug.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A falling half cementing drill-free device, comprising an upper joint (1), characterized in that: The upper joint (1) is fixedly connected with a lower joint (13) on one side, the lower joint (13) is slidably connected with a closing sliding sleeve (4) on the inner wall, the closing sliding sleeve (4) is slidably connected with a central pipe (6) on the inner wall, the central pipe (6) is slidably connected with a lower connecting sleeve (9) on the inner wall, the lower connecting sleeve (9) is slidably connected with a lower sliding sleeve (12) on the outer wall, the lower sliding sleeve (12) is in contact with the inner wall of the lower joint (13), and the lower connecting sleeve (9) is slidably connected with an opening plug seat (7) on the inner wall.

2. The falling half-set well cementing drill-free device according to claim 1, characterized in that: The central pipe (6) is provided with a plurality of circulating channels (5) inside, and extends to the inside of the body shell (3) through the closing sliding sleeve (4), and the circulating channels (5) are used for providing circulating channels for well cementing operation.

3. The semi-completion well cementing drill-free device according to claim 1, characterized in that: The closing sliding sleeve (4) is fixedly connected with a plurality of shear pins (2) on the inner wall, and the shear pins (2) are arranged in an annular array inside the closing sliding sleeve (4).

4. The falling half-set well cementing drill-free device according to claim 3, characterized in that: The shear pins (2) are clamped between the central pipe (6) and the inside, and the shear pins (2) are used for limiting the position of the central pipe (6).

5. The drop-in semi-borehole cementing drill-free device of claim 1, wherein: The lower sliding sleeve (12) is fixedly connected with a plurality of lock blocks (11) inside, and the lock blocks (11) are arranged in an annular array inside the lower sliding sleeve (12).

6. The drop-in semi-borehole cementing drill-free device of claim 5, wherein: The lock blocks (11) are clamped between the lower sliding sleeve (12) and the inside of the lower joint (13), and the lock blocks (11) are used for connecting and fixing the lower sliding sleeve (12) and the lower joint (13).

7. The drop-in semi-borehole cementing drill-free device of claim 1, wherein: The lower sliding sleeve (12) is fixedly connected with a plurality of drill-free pins (10) inside, and the drill-free pins (10) are clamped between the lower connecting sleeve (9) and the inside.

8. The drop-in semi-borehole cementing drill-free device of claim 1, wherein: The lower connecting sleeve (9) is fixedly connected with a plurality of opening pins (8) on one side inside, and the opening pins (8) are clamped between the opening plug seat (7) and the inside.

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