Mechanical drilling-free cementing device

Abstract

The utility model relates to the technical field of cementing devices, and discloses a mechanical drilling-free cementing device which comprises a shell used for bearing the whole body, a closing plug seat, a first pin, a second pin, a second pin, a third pin, a fourth pin, a fourth pin and a fifth pin, and the outer wall of the closing plug seat is connected into the shell in a sliding mode; the outer wall of the closing sliding sleeve is connected to the inner wall of the shell in a sliding mode, a locking block is fixedly connected to the interior of the closing sliding sleeve, a locking claw mandrel is connected to the inner wall of the closing sliding sleeve in a sliding mode, a second circulation channel is formed in one side of the closing sliding sleeve, and a first locking claw is fixedly connected to one side of the locking claw mandrel. According to the drilling-free cement injection device, the closing plug seat slides, the closing plug seat is stressed to abut against the side wall of the locking claw core shaft, the locking claw core shaft is stressed to drive the closing sliding sleeve to move, and the first circulation channel and the second circulation channel are aligned while moving, so that the drilling-free cement injection effect is achieved, and the problem that the working efficiency is reduced due to traditional cement injection is solved; and multi-scale use in reality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cementing devices, in particular to a mechanical drilling-free cementing device. Background Art

[0002] Mechanical, drill-free cementers play a key role in oil well cementing projects. They primarily consist of a main body, a plug system, and a shut-off mechanism. The main body is a high-strength alloy steel cylinder, resistant to the harsh downhole environment. The upper plug of the plug system separates the drilling fluid and cement slurry, while the lower plug pushes the cement slurry and triggers the shut-off mechanism. During operation, the lower plug descends, triggering the shut-off mechanism, while the upper plug squeezes the cement slurry for even distribution. This offers significant advantages, including improved efficiency, eliminating the need for drilling and removal after cementing, and shortening the operation cycle, making it particularly suitable for offshore production. It also improves cementing quality, precisely controls the cement slurry, and prevents backflow. It can adapt to a variety of working conditions, with designs tailored to suit specific conditions, making it widely applicable.

[0003] The traditional mechanical drill-free cementing device has a key structure. The main body structure is a cylindrical metal made of high-strength alloy steel. There are special channels and cavities inside to guide the fluid, and there are connection interfaces on the outside to ensure a tight connection with the casing to prevent leakage. The plug system contains an upper plug and a lower plug. The upper plug isolates the cement slurry from the drilling fluid, and the lower plug pushes the cement slurry and triggers the closing mechanism. The closing mechanism is the core, which consists of a lock, a valve, etc. When the lower plug is in place, the valve is activated through mechanical transmission to cut off the cement slurry channel to prevent backflow. The connecting parts include joints and interfaces, which must ensure a tight connection and good sealing with the surrounding equipment. For example, the threaded connection must meet high-pressure requirements and be equipped with seals.

[0004] However, compared with the drill-free cementing device, the traditional cementing method has many disadvantages. In terms of operational efficiency, the process is complex and time-consuming. After cementing, the internal device needs to be drilled out. In deep well operations, this process may take several days, while the drill-free cementing device can eliminate this step. In addition, the operation is easily interrupted due to factors such as drill bit damage during drilling, which increases the risk. The drill-free cementing device is simple to operate and has a low interruption risk. In terms of cementing quality, the traditional method has poor uniformity of cement slurry distribution and is prone to local unevenness, while the drill-free cementing device can accurately control the injection. The traditional method has a high risk of cement slurry backflow, which affects the quality of the cement ring. The drill-free cementing device has an automatic channel closing mechanism to avoid this. In terms of adaptability to working conditions, the traditional method has poor flexibility and is cumbersome to adjust to different working conditions. The drill-free cementing device can adapt to various environments by changing its own structure and component performance. Therefore, a mechanical drill-free cementing device is proposed to solve the above problems. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a mechanical drilling-free cementing device, which aims to improve the problem of excessive waste of working time in the traditional method of pouring cement in the prior art.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A mechanical drilling-free cementing device, comprising:

[0008] The housing is used to support the entire:

[0009] A closing plug seat, the outer wall of which is slidably connected to the interior of the housing, a first pin being provided inside the closing plug seat, and the closing plug seat being used to block the boost function;

[0010] A closing sleeve, wherein the outer wall of the closing sleeve is slidably connected to the inner wall of the housing, a locking block is fixedly connected to the interior of the closing sleeve, a locking claw core shaft is slidably connected to the inner wall of the closing sleeve, a second circulation channel is opened on one side of the closing sleeve, a first locking claw is fixedly connected to one side of the locking claw core shaft, a first circulation channel is opened on the outer wall of the first locking claw, and the closing sleeve is used to control the flow of cement;

[0011] A lower joint, the outer wall of which is fixedly connected to the inner wall of the shell, and the lower joint is used to connect to the well and transmit cement downward;

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

[0013] A first-level cementing channel is provided on the inner wall of the locking claw core shaft, and the other end of the first-level cementing channel is provided on the side wall of the lower joint;

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

[0015] The side wall of the first locking claw is arranged on the inner wall of the housing;

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

[0017] The outer wall of the closing plug seat is slidably connected to the inner wall of the locking claw core shaft, and one side of the closing plug seat is arranged on the side wall of the locking claw core shaft;

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

[0019] A shear pin is slidably connected to the interior of the closing sleeve, and the other side of the shear pin is arranged inside the locking pawl core shaft;

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

[0021] The bottom of the first circulation channel is arranged on the outer wall of the closing sleeve, and the bottom of the second circulation channel is arranged on the outer wall of the locking pawl core shaft;

[0022] As a further description of the above technical solution:

[0023] The shear pin side wall is arranged on the lower joint side wall, and the outer wall of the locking claw core shaft is slidably connected to the inner wall of the closing sleeve;

[0024] As a further description of the above technical solution:

[0025] The side wall of the locking pawl core shaft is arranged on the side wall of the locking block.

[0026] The utility model has the following beneficial effects:

[0027] In the utility model, the closing plug seat slides, and the force applied to the closing plug seat causes it to rest against the side wall of the locking claw core shaft. The locking claw core shaft is forced to drive the closing sleeve to move, and the first circulation channel and the second circulation channel are aligned while moving, thereby achieving the effect of drilling-free cementing, solving the problem that traditional cementing will reduce work efficiency, and improving the multi-scale use of mechanical drilling-free cementing devices in reality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a plan view of the shell of a mechanical drilling-free cementing device proposed in the utility model;

[0029] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0030] Figure 3 This is a schematic diagram of the side wall structure of a primary cementing channel of a mechanical drilling-free cementing device proposed in the utility model.

[0031] Legend:

[0032] 1. First locking claw; 2. Housing; 3. Closing plug seat; 4. Locking block; 5. Locking claw core shaft; 6. Closing sleeve; 7. First circulation channel; 8. Shear pin; 9. Second circulation channel; 10. Primary cementing channel; 11. Lower joint; 12. First pin. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Reference Figure 1 - Figure 3 The present invention provides an embodiment of a mechanical drilling-free cementing device, comprising:

[0035] Shell 2, shell 2 is used to support the whole:

[0036] A closing plug seat 3, the outer wall of which is slidably connected to the inside of the housing 2, and a first pin 12 is provided inside the closing plug seat 3, and the closing plug seat is used to block the boost function;

[0037] A closing sleeve 6 is provided, wherein the outer wall of the closing sleeve 6 is slidably connected to the inner wall of the housing 2, a locking block 4 is fixedly connected to the interior of the closing sleeve 6, a locking claw core shaft 5 is slidably connected to the inner wall of the closing sleeve 6, a second circulation channel 9 is provided on one side of the closing sleeve 6, a first locking claw 1 is fixedly connected to one side of the locking claw core shaft 5, and a first circulation channel 7 is provided on the outer wall of the first locking claw 1. The closing sleeve is used to control the flow of cement;

[0038] The lower joint 11, the outer wall of the lower joint 11 is fixedly connected to the inner wall of the shell 2, and the lower joint 11 is used to connect to the well and transmit cement downward.

[0039] A first-level cementing channel 10 is opened on the inner wall of the locking claw core shaft 5, and the other end of the first-level cementing channel 10 is arranged on the side wall of the lower joint 11. The side wall of the first locking claw 1 is arranged on the inner wall of the shell 2, and the outer wall of the closing plug seat 3 is slidably connected to the inner wall of the locking claw core shaft 5. One side of the closing plug seat 3 is arranged on the side wall of the locking claw core shaft 5. A shear pin 8 is slidably connected to the inside of the closing sleeve 6, and the other side of the shear pin 8 is arranged inside the locking claw core shaft 5. The bottom of the first circulation channel 7 is arranged on the outer wall of the closing sleeve 6, and the bottom of the second circulation channel 9 is arranged on the outer wall of the locking claw core shaft 5. The side wall of the shear pin 8 is arranged on the side wall of the lower joint 11. The outer wall of the locking claw core shaft 5 is slidably connected to the inner wall of the closing sleeve 6, and the side wall of the locking claw core shaft 5 is arranged on the side wall of the locking block 4;

[0040] Specifically, when using mechanical drill-free cementing devices in oil extraction and other related engineering operations, there is a rigorous and ingenious operating process. First, after the first-level cementing is successfully completed, a gravity plug is dropped into a specific position at the wellhead. This gravity plug will accurately reach the designated position during the falling process, thereby opening the plug to block the first-level cementing channel 10. At this time, the wellhead is pressurized. Under the action of pressure, the closing sleeve 6 begins to move. The strong pressure forces it to overcome the resistance of the shear pin 8 and move downward along a specific path. In this process, the closing sleeve 6 is tightly combined with the step of the locking claw core shaft 5 under the action of the locking block 4, achieving precise positioning. At the same time, the first circulation channel 7 and the second circulation channel 9 are cleverly designed to connect the inside and outside of the sleeve, creating good conditions for subsequent secondary cementing. Afterwards, the secondary cementing operation can be carried out. During the secondary cementing process, construction personnel need to accurately control various cementing parameters based on relevant standards and experience to ensure that the cementing quality meets the expected requirements. After the secondary cementing is completed, a closing plug is inserted into the device. This closing plug will perfectly combine with the inner hole of the closing plug seat 3 during the falling process. Then, by applying pressure to the system, when the pressure reaches a certain level, the first pin 12 will be sheared off. Driven by this action, the closing plug seat 3 begins to descend, and the originally locked locking claw is released and moves downward synchronously. During the downward movement of the locking claw, the closing sleeve 6 will continue to move downward along the designed path, thereby closing the circulation channel smoothly. Afterwards, the pressurization operation is continued, so that the locking claw core shaft 5 continues to move downward to the bottom of the well under the push of pressure. Through such a series of complex and orderly operations, the effect of drilling-free plug is finally achieved, which greatly improves the efficiency of cementing operations and reduces the complexity and cost of subsequent operations.

[0041] Working principle: When using a mechanical drill-free cementing device, first, after the first-level cementing is completed, gravity is applied at the wellhead position, and the plug is opened to seal the first-level cementing channel 10 to hold the pressure, and then the sleeve 6 is closed to shear the shear pin 8 downward under the action of pressure. At this time, the closing sleeve 6 is limited by the step of the locking claw core shaft 5 under the action of the locking block 4. At the same time, the first circulation channel 7 and the second circulation channel 9 connect the inside and outside of the sleeve, and then the secondary cementing is carried out. At the same time, after the cementing is completed, a closing plug is introduced into the inside, and the inner hole of the closing plug seat 3 is combined, and the first pin 12 is sheared off under pressure, and the closing plug seat 3 moves downward. The locking claw is released to move downward, and at the same time, the closing sleeve 6 is driven to continue to move downward, so that the circulation channel is closed, and the locking claw core shaft 5 is continued to be pressurized to move downward to the bottom of the well, achieving the effect of drilling-free plugging.

[0042] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mechanical drilling-free cementing device, characterized in that: include: A housing (2), wherein the housing (2) is used to support the entire structure: A closing plug seat (3), the outer wall of which is slidably connected to the interior of the housing (2), a first pin (12) being provided inside the closing plug seat (3), and the closing plug seat being used to block the boost function; A closing sleeve (6), wherein the outer wall of the closing sleeve (6) is slidably connected to the inner wall of the housing (2), a locking block (4) is fixedly connected inside the closing sleeve (6), a locking claw core shaft (5) is slidably connected to the inner wall of the closing sleeve (6), a second circulation channel (9) is opened on one side of the closing sleeve (6), a first locking claw (1) is fixedly connected to one side of the locking claw core shaft (5), a first circulation channel (7) is opened on the outer wall of the first locking claw (1), and the closing sleeve is used to control the flow of cement; A lower joint (11), the outer wall of the lower joint (11) is fixedly connected to the inner wall of the outer shell (2), and the lower joint (11) is used to connect to the well and transmit cement downward.

2. The mechanical drilling-free cementing device according to claim 1, characterized in that: A first-level cementing channel (10) is provided on the inner wall of the locking claw core shaft (5), and the other end of the first-level cementing channel (10) is arranged on the side wall of the lower joint (11).

3. The mechanical drilling-free cementing device according to claim 1, characterized in that: The side wall of the first locking claw (1) is arranged on the inner wall of the housing (2).

4. The mechanical drilling-free cementing device according to claim 1, characterized in that: The outer wall of the closing plug seat (3) is slidably connected to the inner wall of the locking claw core shaft (5), and one side of the closing plug seat (3) is arranged on the side wall of the locking claw core shaft (5).

5. The mechanical drilling-free cementing device according to claim 1, characterized in that: A shear pin (8) is slidably connected inside the closing sleeve (6), and the other side of the shear pin (8) is arranged inside the locking pawl core shaft (5).

6. The mechanical drilling-free cementing device according to claim 1, characterized in that: The bottom of the first circulation channel (7) is arranged on the outer wall of the closing sleeve (6), and the bottom of the second circulation channel (9) is arranged on the outer wall of the locking pawl core shaft (5).

7. The mechanical drilling-free cementing device according to claim 5, characterized in that: The side wall of the shear pin (8) is arranged on the side wall of the lower joint (11), and the outer wall of the locking claw core shaft (5) is slidably connected to the inner wall of the closing sleeve (6).

8. The mechanical drilling-free cementing device according to claim 5, characterized in that: The side wall of the locking claw core shaft (5) is arranged on the side wall of the locking block (4).

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