Autonomously identifying a selective delamination switch

Abstract

The application discloses an autonomous identification and selection selective delaminating switch and belongs to the technical field of oil extraction. The autonomous identification and selection selective delaminating switch comprises a control box integrated by a high-precision sensor, a control circuit board, a battery box, a fuse and a fuse piston which is arranged in a clamping groove of a central pipe. The control box is used for realizing autonomous identification of high and low water content and high and low pressure layer sections and performing judgment. The autonomous identification and selection selective delaminating switch is free from a data collection process of a previous oil extraction well layer section, can automatically open a liquid inlet passage of a low pressure layer section and does not need a cable to be lowered into a well for control, so that operation cost is greatly saved.

Description

Technical Field

[0001] This utility model belongs to the field of oilfield production technology, and specifically relates to an autonomous identification selective stratification switch. Background Technology

[0002] Well plugging is a crucial method in oilfield development. During plugging, data from each well section is required. After data analysis, high-water-cut layers are selected for plugging. However, data collection from each well section is extremely tedious and difficult, requiring layer-by-layer pressure testing to collect data, resulting in high costs and long processing times. Furthermore, the collected data is affected by time constraints and the number of samples collected, leading to data instability and hindering efficient well plugging operations. Electrically controlled switches are also extremely expensive, difficult to install, require cables to be run down the well, and are frequently subject to failure due to the downhole environment, causing switches to malfunction or fail to turn on or off. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide an autonomously identifying selective layering switch, which greatly saves data acquisition costs and allows well sealing operations to be completed in one tubing run.

[0004] The technical solution adopted by the utility model is: an autonomous identification selective layer switch, the key technical points of which include an upper connector, an outer sleeve, a central tube, a high-precision sensor, a control circuit board, a battery box, a fuse, a fuse piston, a sealing inner sleeve, a working piston, a connecting sleeve, a lower outer sleeve, a balance piston, a shear pin, a retaining ring, and a lower connector. The high-precision sensor, control circuit board, battery box, fuse, and fuse piston are integrated in the control box and installed in the slot of the central tube; the outer sleeve is fitted outside the control box and threadedly connected to the upper connector; the working piston is located between the outer sleeve and the sealing inner sleeve; the balance piston is connected to the lower outer sleeve by a shear pin, and its lower part is provided with a retaining ring; the upper part of the lower outer sleeve is threadedly connected to the connecting sleeve, and the lower part of the lower outer sleeve is connected to the lower connector.

[0005] In the above scheme, the fusible piston is connected to the central tube, and the other end is connected to the fuse. After the fuse melts, the liquid in the central tube enters the sealing cavity through the fusible piston hole. After water enters the sealing cavity, the working piston moves downward and pushes the balance piston to shear the shear pin. The balance piston is balanced in pressure before release and is locked in the lower outer sleeve by a retaining ring after release to prevent rebound.

[0006] In the above scheme, the lower part of the working piston is machined with a strip-shaped liquid inlet hole. When the balance piston moves down, the liquid inlet hole corresponds to the liquid inlet hole of the lower outer sleeve, so as to realize liquid passage.

[0007] In the above scheme, after the balance piston moves down, the retaining ring is locked in the lower part of the lower outer sleeve to prevent rebound.

[0008] In the above scheme, the control circuit board is electrically connected to the high-precision sensor and receives the pressure signal from the high-precision sensor to determine the water-bearing properties of the formation and control the fuse to work.

[0009] The beneficial effects of this invention are as follows: This autonomous selective stratification switch includes a control box integrated with a high-precision sensor, control circuit board, battery box, fuse, and fuse piston, housed in a slot in the central tube. This control box enables autonomous identification and judgment of high and low water-cut and high and low-pressure strata. It eliminates the need for preliminary well strata data acquisition, automatically opens the fluid inlet channel for low-pressure strata, and eliminates the need for cable-guided well control, significantly reducing construction costs. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of an autonomous identification selective layer switch according to the present invention; The numbers in the diagram are explained as follows: 1-Upper connector, 2-Outer sleeve, 3-Center tube, 4-High-precision sensor, 5-Control circuit board, 6-Battery box, 7-Fuse, 8-Fuse piston, 9-Sealing inner sleeve, 10-Working piston, 11-Connecting sleeve, 12-Lower outer sleeve, 13-Balance piston, 14-Cut pin, 15-Snap ring, 16-Lower connector. Detailed Implementation

[0012] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the following description is provided in conjunction with the appendix. Figure 1 The present invention will be further described in detail below with reference to specific embodiments.

[0013] This embodiment employs an autonomous identification selective layered switch, comprising an upper connector 1, an outer sleeve 2, a central tube 3, a high-precision sensor 4, a control circuit board 5, a battery box 6, a fuse 7, a fuse piston 8, a sealing inner sleeve 9, a working piston 10, a connecting sleeve 11, a lower outer sleeve 12, a balance piston 13, a shear pin 14, a retaining ring 15, and a lower connector 16. Its structure is as follows: The lower part of the upper connector 1 is threadedly connected to the central tube 3, and the lower part of the central tube 3 is connected to the sealing inner sleeve 9. The high-precision sensor 4, control circuit board 5, battery box 6, fuse 7, and fuse piston 8 are integrated within the control box and installed in the slot of the central tube 3. The battery box 5 is connected to the high-precision sensor 4, fuse 7, and control circuit board 5 respectively, providing power to all three. The high-precision sensor directly and accurately senses the formation pressure and is connected to the signal terminal of the control circuit board 5 to transmit the collected signal to the control circuit board 5. The fuse 7 is connected to the control output terminal of the control circuit board 5 via a wire. After receiving the trigger signal from the control circuit board 5, it will generate thermal or mechanical impact. In this embodiment, when the fuse 7 is triggered, the energy it generates will immediately melt or shatter the fuse piston 8, thereby compromising its sealing performance. After the high-precision sensor 4 collects the pressure signal, it transmits the signal to the control circuit board 5. The control circuit board 5 analyzes the data and makes a judgment. If it is judged to be a low water content layer, it sends a command to the fuse 7 to control the fuse 7 to act and break the seal of the fuse piston 8. The liquid in the central tube 3 enters the sealed cavity through the broken fuse piston 8, pushes the subsequent piston to move, and opens the liquid inlet channel.

[0014] In this embodiment, a sampling time is set within the control circuit board 5. After the control circuit board 5 receives pressure data from the high-precision sensor 4, it compares the data from the first sample taken at the set time with the data from the last sample taken before the sampling time is reached. If the latter data shows a multiple difference compared to the former data, it compares the data with a set threshold to determine whether the tool is in a low-water-content layer or a high-water-content layer. This embodiment does not protect the control process and is only used to explain the working process of the controller.

[0015] In this embodiment, the outer sleeve 2 is fitted over the control box 6 and threadedly connected to the upper connector 1. The balance piston 13 is connected to the lower outer sleeve 12 via a shear pin 14, and a retaining ring 15 is provided at its lower part. The upper part of the lower outer sleeve 12 is threadedly connected to the connecting sleeve 11, and the lower part of the lower outer sleeve 12 is connected to the lower connector 16. The working piston 10 is installed between the outer sleeve 2 and the sealing inner sleeve 9, and the lower part of the outer sleeve 2 is threadedly connected to the connecting sleeve 11.

[0016] The working principle of the layered switch used in this embodiment is as follows: During operation, the tool is lowered into the middle of a certain layer within the casing, and a packer is used to seal it from the top and bottom. Data acquisition is awaited. After 30 minutes, the control circuit board 5 analyzes the pressure value to determine if this layer is a low-pressure layer. If it is a high-pressure layer, the tool does not operate; if it is a low-pressure layer, the fuse 7 inside the tool automatically activates and fuses the piston 8. The central tube 3 is pressurized to 12 MPa, and liquid enters the sealed cavity through the fuse piston hole, pushing the working piston 10 downwards. This causes the balance piston 13 to shear the shear pin 14 downwards, at which point the liquid inlet of the lower outer sleeve 12 opens, allowing liquid to enter. The retaining ring 15 at the bottom of the balance piston is engaged with the lower part of the lower outer sleeve 12. Liquid enters the central tube 3 through the liquid inlet of the lower outer sleeve 12, corresponding to the liquid inlet of the working piston 10, thus completing oil extraction.

[0017] In this embodiment, a pressure curve is plotted based on the pressure collected by the high-precision sensor 4. According to the pressure curve detected in this sealing section, it can be seen that since the pressure recovery rate and pressure magnitude of each formation are different, the pressure recovery of the high aquifer is fast and the pressure change curve is relatively vertical, while the pressure recovery of the low aquifer is slow and the curve is relatively smooth. This can intuitively verify the effectiveness of the method of this utility model.

[0018] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An autonomously identifying selectively delaminating switch, characterized by: It includes an upper connector, outer sleeve, central tube, high-precision sensor, control circuit board, battery box, fuse, fuse piston, sealing inner sleeve, working piston, connecting sleeve, lower outer sleeve, balance piston, shear pin, retaining ring, and lower connector; The high-precision sensor, control circuit board, battery box, fuse, and fuse piston are integrated in the control box and installed in the slot of the central tube; the outer sleeve is fitted outside the control box and threadedly connected to the upper connector; the working piston is located between the outer sleeve and the sealing inner sleeve; the balance piston is connected to the lower outer sleeve by a shear pin, and its lower part is provided with a retaining ring; the upper part of the lower outer sleeve is threadedly connected to the connecting sleeve, and the lower part of the lower outer sleeve is connected to the lower connector.

2. The autonomously identifying, selectively delaminating switch of claim 1, wherein: The fusible piston is connected to the central tube, and the other end is connected to the fuse. After the fuse melts, the liquid in the central tube enters the sealing cavity through the fusible piston hole. After water enters the sealing cavity, the working piston moves downward and pushes the balance piston to shear the shear pin. The balance piston is balanced in pressure before release and is locked in the lower outer sleeve by a retaining ring after release to prevent rebound.

3. The autonomous identification selective layering switch as described in claim 1, characterized in that: The lower part of the working piston is machined with a strip-shaped liquid inlet hole. When the balance piston moves down, the liquid inlet hole corresponds to the liquid inlet hole of the lower outer sleeve, so as to realize liquid passage.

4. The autonomous identification selective layering switch as described in claim 1, characterized in that: After the balance piston moves downward, the retaining ring locks into the lower part of the outer sleeve to prevent the balance piston from springing back upward after moving downward.

5. The autonomous identification selective layering switch as described in claim 1, characterized in that: The control circuit board is electrically connected to the high-precision sensor and receives pressure signals from the high-precision sensor to determine the water content of the formation and control the fuse to operate.

Images