Environment-friendly operation reciprocating stroke switch control device and control method

Abstract

The present application relates to the technical fields of oil exploitation downhole tool, and provides a reciprocating stroke switch control device and control method for environmental protection operation, which comprises a cylinder, a sliding sleeve, a sealing ring, an oil-resistant rubber ring, a steel ball and a switch joint. The sliding sleeve is inserted into the cylinder, and the cylinder comprises a lower cylinder and an upper cylinder, and the inner wall of the upper cylinder is provided with a release annulus; the sliding sleeve is installed close to one side of the lower cylinder, and a strip hole is arranged on the sliding sleeve, the steel ball is installed in the strip hole, and the steel ball can move radially and axially; the oil-resistant rubber ring is installed on the inner wall of the lower cylinder and corresponds to the steel ball; and the switch joint is inserted into the sliding sleeve. The reciprocating stroke switch control device for environmental protection operation can improve the efficiency of oil extraction process operation and the reliability of safety and environmental protection.

Description

Technical Field

[0001] This invention relates to the field of downhole tools technology for oil extraction, and in particular to an environmentally friendly reciprocating limit switch control device and control method. Background Technology

[0002] In oil well operations, precise control of the connection and closure of the casing and oil well is required to meet the diverse needs of oil production processes for downhole fluid channels. Existing downhole tool control structures suffer from complex control processes and low reliability of state switching, making it difficult to efficiently and stably achieve functional transitions between different operational stages. This affects oil production efficiency and the reliability of operational safety and environmental protection. Therefore, there is an urgent need for a downhole tool control scheme with a reasonable structural design and precise state switching. Summary of the Invention

[0003] In view of this, the present invention aims to propose an environmentally friendly reciprocating limit switch control device and control method, which achieves stable switching between different operating states by precisely controlling the axial movement position of the switch coupling, meeting the downhole operation requirements such as oil casing connection and shutdown, and improving the efficiency and safety and environmental reliability of the oil production process.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] An environmentally friendly reciprocating limit switch control device includes a cylinder, a sliding sleeve, a sealing ring, an oil-resistant rubber ring, a steel ball, and a switch coupling. The sliding sleeve is inserted into the cylinder. The cylinder includes a lower cylinder and an upper cylinder. The inner wall of the upper cylinder is provided with a release annulus.

[0006] The sliding sleeve is installed near the lower cylinder. The sliding sleeve has a strip-shaped hole, and the steel ball is installed in the strip-shaped hole. The steel ball can move radially or axially.

[0007] The oil-resistant rubber ring is installed on the inner wall of the lower cylinder and its position corresponds to that of the steel ball;

[0008] The switch coupling is inserted into the sliding sleeve;

[0009] The steel ball and the release annulus form a linkage mechanism. When the switch coupling moves upward to the position of the release annulus, the steel ball partially embeds into the release annulus to restrict the movement of the sliding sleeve, and at the same time releases the limit on the switch coupling, realizing the connection between the oil sleeve and the sleeve.

[0010] When the switch coupling moves downward, the steel ball is squeezed back into the oil-resistant rubber ring, triggering the seal to close.

[0011] Furthermore, the sealing ring is installed on the sliding sleeve, and the sliding sleeve forms a sealing fit with the lower cylinder through the sealing ring; the lower cylinder and the upper cylinder are connected by threads.

[0012] Furthermore, the release annulus is located in the middle of the inner wall of the upper cylinder, and its depth allows the steel ball to be partially embedded.

[0013] Furthermore, oil pipes are connected to the lower part of the lower cylinder and the upper part of the upper cylinder, respectively.

[0014] Another objective of this invention is to propose an environmentally friendly reciprocating limit switch control method, wherein step S1 is initial sealing and closing: the switch coupling is located in the lower cylinder, and the sealing ring closes the oil jacket channel;

[0015] Step S2: The downward movement of the switch coupling passes through the steel ball: The downward movement of the switch coupling squeezes the steel ball, causing part of it to enter the oil-resistant rubber ring. After passing through, the steel ball returns to its original position.

[0016] Step S3 Pre-open state: The switch coupling moves upward, causing the steel ball to detach from the oil-resistant rubber ring and enter the inner cavity of the upper cylinder;

[0017] Step S4 Oil-jacket connection status: The switch coupling continues to move upward to the release annulus position, the steel ball is embedded in the release annulus to lock the sliding sleeve, and the oil-jacket channel is opened;

[0018] Step S5 Pre-closed state: The switch coupling descends to contact the steel ball, pushing the sliding sleeve and sealing ring down, and re-closing the oil sleeve channel.

[0019] Furthermore, in step S4, after the switch coupling passes through the release annulus, the steel ball falls back to the working position by gravity.

[0020] Furthermore, in the oil-casing connection state of step S4, a positive circulation well washing operation can be performed.

[0021] Furthermore, the switch coupling is driven by the sucker rod, triggering the connection of the oil jacket after 20 meters of upward movement and triggering the closure of the oil jacket after 20 meters of downward movement.

[0022] Compared with existing technologies, the environmentally friendly reciprocating limit switch control method proposed in this invention has the following advantages:

[0023] The environmentally friendly reciprocating limit switch control device and method described in this invention achieves stable switching between different operating states by precisely controlling the axial movement position of the switch coupling, meeting the needs of downhole operations such as oil casing connection and closure, and improving the efficiency and safety and environmental reliability of oil production operations. Simultaneously, the control logic and state switching timing of the switch coupling can be flexibly adjusted according to different oil production process requirements, adapting to various downhole operation scenarios. Especially during downhole operations, channel control enables environmentally friendly cleaning of tubing and pipes. Attached Figure Description

[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0025] Figure 1 This is an overall schematic diagram of the environmental protection operation reciprocating limit switch control device according to an embodiment of the present invention;

[0026] Figure 2 This is the sealed and closed state before the reciprocating limit switch control device for environmental protection operations described in this embodiment of the invention is lowered into the well;

[0027] Figure 3 This is the state of the reciprocating limit switch control device for environmental protection operations described in this embodiment of the invention before the switch coupling moves downward past the steel ball;

[0028] Figure 4 This is the pre-open state of the switch coupling of the reciprocating limit switch control device for environmental protection operations described in this embodiment of the invention.

[0029] Figure 5 The switch coupling of the reciprocating limit switch control device for environmental protection operations described in this embodiment of the invention is in the upward opening state of the oil sleeve connection.

[0030] Figure 6 This is the downward pre-closed state of the switch coupling of the environmental protection operation reciprocating limit switch control device described in this embodiment of the invention;

[0031] Explanation of reference numerals in the attached figures: Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0033] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "back," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] This embodiment relates to an environmentally friendly reciprocating limit switch control device, which can improve the efficiency and safety and environmental reliability of oil extraction operations.

[0036] Based on the above design concept, an exemplary structure of the environmental protection operation reciprocating limit switch control device in this embodiment is as follows: Figure 1-6 As shown, it mainly includes a cylinder, a sliding sleeve 2, a sealing ring 3, an oil-resistant rubber ring 4, a steel ball 5, and a switch coupling 8. The sliding sleeve 2 is inserted into the cylinder. The cylinder includes a lower cylinder 1 and an upper cylinder 6. The inner wall of the upper cylinder 6 is provided with a release annular cavity 7. The sliding sleeve 2 is installed near the lower cylinder 1. The sliding sleeve 2 is provided with a strip-shaped hole. The steel ball 5 is installed in the strip-shaped hole. The steel ball 5 can move radially or axially. The oil-resistant rubber ring 4 is installed on the inner wall of the lower cylinder 1 and its position corresponds to that of the steel ball 5. The switch coupling 8 is inserted into the sliding sleeve 2. The steel ball 5 and the release annular cavity 7 form a linkage mechanism. When the switch coupling 8 moves upward to the position of the release annular cavity 7, the steel ball 5 is partially embedded in the release annular cavity 7 to restrict the movement of the sliding sleeve 2, and at the same time, the limit on the switch coupling 8 is released, realizing the connection between the oil sleeve and the sliding sleeve. When the switch coupling 8 moves downward, the steel ball 5 is squeezed back into the oil-resistant rubber ring 4, triggering the sealing closure.

[0037] The sealing ring 3 is installed on the sliding sleeve 2, and the sliding sleeve 2 forms a sealing fit with the lower cylinder 1 through the sealing ring 3; the lower cylinder 1 and the upper cylinder 6 are connected by threads.

[0038] The release annulus 7 is located in the middle of the inner wall of the upper cylinder 6, and its depth allows the steel ball 5 to be partially embedded.

[0039] The lower part of the lower cylinder 1 and the upper part of the upper cylinder 6 are respectively connected to oil pipes.

[0040] The control method for reciprocating limit switches in environmental protection operations is as follows:

[0041] like Figure 2 As shown, in step S1, the initial seal is closed: the switch coupling 8 is located inside the lower cylinder 1, and the sealing ring 3 closes the oil jacket channel;

[0042] like Figure 3 As shown, in step S2, the switch coupling 8 moves downwards and passes through the steel ball 5: the downward movement of the switch coupling 8 squeezes the steel ball 5 so that part of it enters the oil-resistant rubber ring 4, and after passing through, the steel ball 5 returns to its original position.

[0043] like Figure 4 As shown, in step S3, the pre-open state is as follows: the switch coupling 8 moves upward, causing the steel ball 5 to disengage from the oil-resistant rubber ring 4 and enter the inner cavity of the upper cylinder 6.

[0044] like Figure 5 As shown, in step S4, the oil sleeve is connected: the switch coupling 8 continues to move upward to the position of the release annulus 7, the steel ball 5 is embedded in the release annulus 7 to lock the sliding sleeve 2, and the oil sleeve channel is opened;

[0045] like Figure 6 As shown, in step S5, the pre-closed state is as follows: the switch coupling 8 moves downward to contact the steel ball 5, pushing the sliding sleeve 2 and the sealing ring 3 downward, thus re-closing the oil sleeve channel.

[0046] In step S4, after the switch coupling 8 passes through the release annulus 7, the steel ball 5 falls back to the working position by gravity.

[0047] In step S4, with the oil casing connected, a positive circulation well washing operation can be performed.

[0048] The switch coupling 8 is driven by the sucker rod. It triggers the connection of the oil jacket when it moves up 20 meters and triggers the closure of the oil jacket when it moves down 20 meters.

[0049] When using the environmental protection operation reciprocating limit switch control device described in this embodiment, firstly, assemble the device:

[0050] According to the design requirements, the sealing ring 3 and steel ball 5 are installed in the sliding sleeve in sequence, the oil-resistant rubber ring 4 is installed in the corresponding position in the upper cylinder 1, the sliding sleeve assembly is installed in the lower cylinder 1, and the upper cylinder 6 is connected. Before going down into the well, the overall sealing pressure test is carried out and the test is qualified. Finally, the switch coupling 8 is assembled on the ground to ensure that all components are installed in place, the movement clearance is reasonable, and the axial movement is smooth.

[0051] Then, the device was lowered into the well:

[0052] 1. After assembly, the device is installed about 19 meters above the deep well pump, between the second and third tubing, and the sealing effect is verified after oil is run.

[0053] 2. The switch coupling is lowered into the well along with the sucker rod at a position 5-10 meters above the piston.

[0054] Then, open the operation:

[0055] When the upper sucker rod reaches 20 meters, perform a positive circulation well flush to clean the tubing and sucker rod downhole.

[0056] Final shutdown operation:

[0057] Once the sucker rod is lowered 20 meters or the well is in normal operating condition, the downhole equipment can be sealed.

[0058] In actual downhole operations, the triggering timing and control parameters for state switching can be adjusted according to the specific reservoir geological conditions and oil production process. For example, when operating in high-pressure reservoirs, the pre-tightening force of the sealing components can be appropriately increased, and the pressure and tension of the switch coupling 8 can be optimized to ensure reliable operation of the device.

[0059] The environmentally friendly reciprocating limit switch control device using the above implementation scheme achieves precise state switching. Through the axial movement of the switch coupling 8, in conjunction with the structure of each component, it achieves precise and orderly switching between multiple states, such as sealing and closing, and oil jacket connection, meeting the stringent requirements of complex downhole operations for channel control.

[0060] Improved operational reliability: Sealing components and structural design effectively prevent fluid leakage and ensure a stable downhole working environment; multi-state transition process avoids tool damage or operational failure caused by sudden state changes, thus improving overall operational reliability.

[0061] High adaptability: The switch coupling control logic and state switching timing can be flexibly adjusted according to different oil production process requirements, adapting to various downhole operation scenarios. In particular, during downhole operations, the channel control enables downhole pipe cleaning, achieving environmentally friendly operations.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An environmentally friendly reciprocating limit switch control device, comprising a cylinder, a sliding sleeve (2), a sealing ring (3), an oil-resistant rubber ring (4), a steel ball (5), and a switch coupling (8), characterized in that: The sliding sleeve (2) is inserted into the cylinder body, the cylinder body includes a lower cylinder body (1) and an upper cylinder body (6), and the inner wall of the upper cylinder body (6) is provided with a release annulus (7). The sliding sleeve (2) is installed close to the lower cylinder (1) side. The sliding sleeve (2) is provided with a strip hole. The steel ball (5) is installed in the strip hole. The steel ball (5) can move both radially and axially. The oil-resistant rubber ring (4) is installed on the inner wall of the lower cylinder (1) and its position corresponds to that of the steel ball (5); The switch coupling (8) is inserted into the sliding sleeve (2); The steel ball (5) and the release annulus (7) form a linkage mechanism. When the switch coupling (8) moves up to the position of the release annulus (7), the steel ball (5) is partially embedded in the release annulus (7) to restrict the movement of the sliding sleeve (2), and at the same time releases the limit on the switch coupling (8) to realize the connection between the oil sleeve and the sleeve. When the switch coupling (8) moves downward, the steel ball (5) is squeezed back into the oil-resistant rubber ring (4), triggering the seal to close; The release annulus (7) is located in the middle of the inner wall of the upper cylinder (6), and its depth allows the steel ball (5) to be partially embedded.

2. The reciprocating limit switch control device for environmental protection operations according to claim 1, characterized in that: The sealing ring (3) is installed on the sliding sleeve (2), and the sliding sleeve (2) forms a sealing fit with the lower cylinder (1) through the sealing ring (3); The lower cylinder (1) and the upper cylinder (6) are connected by threads.

3. The reciprocating limit switch control device for environmental protection operations according to claim 1, characterized in that: The lower part of the lower cylinder (1) and the upper part of the upper cylinder (6) are respectively connected to oil pipes.

4. A control method for an environmental protection operation reciprocating limit switch control device according to any one of claims 1-3, characterized in that, Includes the following steps: Step S1 Initial sealing closure: The switch coupling (8) is located inside the lower cylinder (1), and the sealing ring (3) closes the oil jacket channel; Step S2: The switch coupling (8) moves downward and passes through the steel ball (5): The switch coupling (8) moves downward and squeezes the steel ball (5) so that part of it enters the oil-resistant rubber ring (4). After passing through, the steel ball (5) returns to its original position. Step S3 Pre-open state: The switch coupling (8) moves upward, causing the steel ball (5) to disengage from the oil-resistant rubber ring (4) and enter the inner cavity of the upper cylinder (6); Step S4 Oil-jacket connection state: The switch coupling (8) continues to move upward to the position of the release annulus (7), the steel ball (5) is embedded in the release annulus (7) to lock the sliding sleeve (2), and the oil-jacket channel is opened; Step S5 Pre-closed state: The switch coupling (8) moves down to contact the steel ball (5), pushing the sliding sleeve (2) and sealing ring (3) down to re-close the oil sleeve channel.

5. The control method of the reciprocating limit switch control device for environmental protection operations according to claim 4, characterized in that: In step S4, after the switch coupling (8) passes through the release annulus (7), the steel ball (5) falls back to the working position by gravity.

6. The control method of the reciprocating limit switch control device for environmental protection operations according to claim 4, characterized in that: In step S4, with the oil casing connected, a positive circulation well washing operation is performed.

7. The control method of the reciprocating limit switch control device for environmental protection operations according to claim 4, characterized in that: The switch coupling (8) is driven by the sucker rod. It triggers the connection of the oil jacket when it moves up 20 meters and triggers the closure of the oil jacket when it moves down 20 meters.

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