Double-cylinder safety lifting system

Abstract

The utility model discloses a double-cylinder safety lifting system which comprises two lifting oil cylinders, a pipeline fixing mechanism and a mechanical forced synchronization mechanism, the two ends of the mechanical forced synchronization mechanism are fixedly connected with the output ends of the two lifting oil cylinders respectively, and the pipeline fixing mechanism is fixedly connected with the mechanical forced synchronization mechanism. An oil return backpressure remote control valve is arranged on a hydraulic oil way of the lifting oil cylinder and used for regulating and controlling the pressure in the lifting oil cylinder, so that the lifting oil cylinder moves stably. According to the utility model, the first adjustable overflow valve and the second adjustable overflow valve are used for adjusting the oil return back pressure of the remote control overflow valve of the rod cavity of the oil cylinder and the oil return back pressure of the remote control overflow valve of the rodless cavity of the oil cylinder, so that the oil return back pressure meets the pressure required when the oil cylinder bears an upward jacking force, and the lifting oil cylinder is always in a stable state to the greatest extent.

Description

Technical Field

[0001] This application relates to a dual-cylinder safety lifting system, belonging to the field of oil and gas well pressurized operation devices. Background Technology

[0002] Oil and gas well pressurized operations equipment is a device used to perform downhole operations under pressure in oil and gas wells. Because oil and gas well operations, especially pressurized operations, are often accompanied by high-pressure toxic, flammable and explosive gases, the requirements for equipment safety and operational safety are particularly high.

[0003] In recent years, how to avoid safety accidents such as pipe flying and pipe falling during operation of live-line working equipment due to sudden situations has become a key research focus for equipment manufacturers. The lifting system of live-line working equipment is the core component of oil and gas well live-line working equipment. The reliability of the lifting system during lifting and pressing is a prerequisite for ensuring operational safety. The presence of high-pressure gas in the well will exert an upward force on the tubing. When the upward force is greater than the weight of the tubing, the tubing will move upward, resulting in pipe flying (this state is called the pipe-light state). The presence of high-pressure gas in the well will exert an upward force on the tubing. When the upward force is less than the weight of the tubing, the tubing will move downward, resulting in pipe falling (this state is called the pipe-heavy state). When there is a leak in the external oil circuit of the lifting cylinder (pipe burst, system depressurization, etc.), safety problems such as cylinder stall may occur, posing a threat to the safe operation of the equipment.

[0004] Therefore, a safe and reliable dual-cylinder safety lifting system needs to be designed. Utility Model Content

[0005] According to one aspect of this application, a dual-cylinder safety lifting system is provided, which maximizes the stability of the lifting cylinder and avoids lifting instability and platform shaking caused by pressure differences and fluctuations during operation.

[0006] A dual-cylinder safety lifting system includes two lifting cylinders, a pipeline fixing mechanism, and a mechanical forced synchronization mechanism. The two ends of the mechanical forced synchronization mechanism are respectively fixedly connected to the output ends of the two lifting cylinders. The pipeline fixing mechanism is fixedly connected to the mechanical forced synchronization mechanism. The system is characterized in that a return oil back pressure remote control valve is provided on the hydraulic oil circuit of the lifting cylinder to regulate the pressure inside the lifting cylinder, so that the lifting cylinder moves stably.

[0007] Optionally, the return oil back pressure remote control valve includes a remote control relief valve and a check valve, wherein the remote control relief valve and the check valve are connected in parallel in the hydraulic oil circuit.

[0008] Optionally, the lifting cylinder is characterized in that both the rod chamber and the rodless chamber of the hydraulic circuit are equipped with a return oil back pressure remote control valve.

[0009] Optionally, the lifting system further includes a first adjustable relief valve, a second adjustable relief valve, and a hydraulic control mechanism. The hydraulic control mechanism includes a hydraulic source and a reversing mechanism, with the output end of the hydraulic source connected to the input end of the reversing mechanism.

[0010] The remote-controlled relief valves of the rod chambers of the two lifting cylinders are connected through a first oil circuit. A first adjustable relief valve is provided on the first oil circuit. The first adjustable relief valve is used to adjust the return oil back pressure of the remote-controlled relief valve of the rod chamber of the cylinder. The rod chambers of the two lifting cylinders and the hydraulic control mechanism form a first hydraulic circuit through the remote-controlled relief valve and the first adjustable relief valve.

[0011] The rodless chamber remote control relief valves of the two lifting cylinders are connected through a second oil circuit. A second adjustable relief valve is provided on the second oil circuit. The second adjustable relief valve is used to adjust the return oil back pressure of the rodless chamber remote control relief valve. The rodless chambers of the two lifting cylinders and the hydraulic control mechanism form a second hydraulic circuit through the remote control relief valve and the second adjustable relief valve.

[0012] Optionally, the forced synchronization mechanism includes a lifting plate, and one end of each of the two lifting cylinders is fixedly connected to both ends of the lifting plate.

[0013] Optionally, the pipe fixing mechanism includes load-bearing slips and anti-top slips;

[0014] The load-bearing clamps and the anti-top clamps are respectively fixedly installed on the upper and lower sides of the lifting plate.

[0015] The beneficial effects that this application can produce include:

[0016] 1) The dual-cylinder safety lifting system provided in this application has a first adjustable relief valve and a second adjustable relief valve to adjust the back pressure of the return oil of the rod-side remote-controlled relief valve and the rodless-side remote-controlled relief valve of the cylinder, so that the back pressure of the return oil meets the pressure required for the cylinder to withstand the upward force, and this value can be changed in real time as the number of lifting or lowering columns varies; thus maximizing the stability of the lifting cylinder.

[0017] 2) The dual-cylinder safety lifting system provided in this application has a remote-controlled relief valve instead of a balance valve, and is supplemented by a parallel adjustable relief valve, which can realize remote back pressure synchronous adjustment of the dual cylinders, ensuring that the working back pressure of the dual cylinders is always consistent, and avoiding lifting instability and platform shaking caused by pressure differences and fluctuations during operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a dual-cylinder safety lifting system according to one embodiment of this application;

[0019] List of components and attached drawings: 1-Lifting cylinder; 2-Mechanical forced synchronization mechanism; 3-Hydraulic source and reversing mechanism; 4-First adjustable relief valve; 5-Second adjustable relief valve; 6-Remote control relief valve; 7-Check valve; 8-Load-bearing slip; 9-Anti-top slip. Detailed Implementation

[0020] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0021] See Figure 1 A dual-cylinder safety lifting system includes two lifting cylinders 1, a pipeline fixing mechanism, and a mechanical forced synchronization mechanism 2. The two ends of the mechanical forced synchronization mechanism 2 are respectively fixedly connected to the output ends of the two lifting cylinders 1. The pipeline fixing mechanism is fixedly connected to the mechanical forced synchronization mechanism 2. The system is characterized in that a return oil back pressure remote control valve is provided on the hydraulic oil circuit of the lifting cylinder 1 to regulate the pressure inside the lifting cylinder 1, so that the lifting cylinder 1 moves stably.

[0022] Specifically, the lifting cylinder 1 drives the mechanical forced synchronization mechanism 2 to move up and down, which in turn drives the hydraulic tubing to move up and down; at the same time, the mechanical forced synchronization mechanism 2 is connected to the cylinder rod of the lifting cylinder 1, so that the two lifting cylinders move up and down synchronously.

[0023] The remote control valve for return oil back pressure includes a remote control relief valve 6 and a check valve 7, which are connected in parallel in the hydraulic oil circuit.

[0024] Specifically, when oil enters the lifting cylinder 1 chamber, the one-way valve 7 opens, and the remote control relief valve 6 is in a short-circuit state and does not work; when oil returns to the chamber, the one-way valve 7 closes. When the return oil back pressure exceeds the set pressure of the remote control relief valve 6, the circuit is connected, and the system returns oil through the remote control relief valve 6, so that the cylinder can move up and down.

[0025] The lifting cylinder 1 is equipped with a return oil back pressure remote control valve on both the rod chamber and the rodless chamber of the hydraulic oil circuit.

[0026] The lifting system also includes a first adjustable relief valve 4, a second adjustable relief valve 5, and a hydraulic control mechanism 3. The hydraulic control mechanism 3 includes a hydraulic source and a reversing mechanism, and the output end of the hydraulic source is connected to the input end of the reversing mechanism.

[0027] Specifically, the reversing mechanism is an electro-hydraulic reversing valve. The electro-hydraulic reversing valve achieves reversing by having the valve core move axially within the valve body, thereby connecting or disconnecting the corresponding oil circuit.

[0028] The remote-controlled relief valves 6 of the rod chambers of the two lifting cylinders 1 are connected through a first oil circuit. A first adjustable relief valve 4 is provided on the first oil circuit. The first adjustable relief valve 4 is used to adjust the return oil back pressure of the remote-controlled relief valve of the rod chamber of the cylinder. The rod chambers of the two lifting cylinders 1 and the hydraulic control mechanism form a first hydraulic circuit through the remote-controlled relief valve 6 and the first adjustable relief valve 4.

[0029] The two rodless chamber remote control relief valves 6 of the two lifting cylinders 1 are connected through a second oil circuit. A second adjustable relief valve 5 is provided on the second oil circuit. The second adjustable relief valve 5 is used to adjust the return oil back pressure of the rodless chamber remote control relief valve of the cylinder. The rodless chamber of the two lifting cylinders 1 and the hydraulic control mechanism form a second hydraulic circuit through the remote control relief valve 6 and the second adjustable relief valve 5.

[0030] Specifically, under heavy pipe conditions, the return oil back pressure of the rodless chamber can be adjusted to a level higher than the cylinder's bearing pressure via the second adjustable relief valve 5; under light pipe conditions, the return oil back pressure of the rod chamber can be adjusted to a level higher than the pressure required for the cylinder to withstand the upward force via the first adjustable relief valve 4; and this value can be changed in real time depending on the number of pipes lifted or lowered; since the remote relief valves 6 of the upper and lower chambers of the lifting cylinder are both installed inside the lifting cylinder 1, this can ensure that the cylinder is always in a stable state, hovering at a certain position or moving at a constant speed, thus structurally avoiding instability or stalling of the cylinder due to pipe rupture, valve leakage, etc.

[0031] The forced synchronization mechanism 2 includes a lifting plate, and one end of each of the two lifting cylinders 1 is fixedly connected to both ends of the lifting plate.

[0032] The pipe fixing mechanism includes a load-bearing slip 8 and an anti-top slip 9;

[0033] The load-bearing slip 8 and the anti-top slip 9 are respectively fixedly installed on the upper and lower sides of the lifting plate.

[0034] The above description is merely a few embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A double-cylinder safety lifting system, comprising two lifting oil cylinders (1), a pipeline fixing mechanism and a mechanical forced synchronization mechanism (2), two ends of the mechanical forced synchronization mechanism (2) are fixedly connected with output ends of the two lifting oil cylinders (1) respectively, and the pipeline fixing mechanism is fixedly connected with the mechanical forced synchronization mechanism (2), characterized in that, The hydraulic oil circuit of the lifting cylinder (1) is provided with a back pressure remote control valve for regulating the pressure in the lifting cylinder (1) to make the lifting cylinder (1) move stably.

2. A dual cylinder safety lifting system according to claim 1, wherein, The back pressure remote control valve comprises a remote overflow valve (6) and a check valve (7), and the remote overflow valve (6) and the check valve (7) are connected in parallel on the hydraulic oil circuit.

3. A dual cylinder safety lifting system as claimed in claim 1 or 2, wherein, The lifting cylinder (1) is provided with a back pressure remote control valve on the hydraulic oil circuit of the rod cavity and the rodless cavity.

4. A dual cylinder safety lifting system as claimed in claim 3, wherein, The lifting system further comprises a first adjustable overflow valve (4), a second adjustable overflow valve (5) and a hydraulic control mechanism (3), the hydraulic control mechanism (3) comprises a hydraulic source and a reversing mechanism, and the output end of the hydraulic source is connected with the input end of the reversing mechanism. The remote overflow valves (6) of the rod cavities of the two lifting cylinders (1) are connected through a first oil circuit, the first oil circuit is provided with the first adjustable overflow valve (4), the first adjustable overflow valve (4) is used for adjusting the back pressure of the remote overflow valve of the rod cavity of the cylinder, and the rod cavities of the two lifting cylinders (1) and the hydraulic source form a first hydraulic circuit through the remote overflow valves (6) and the first adjustable overflow valve (4). The remote overflow valves (6) of the rodless cavities of the two lifting cylinders (1) are connected through a second oil circuit, the second oil circuit is provided with the second adjustable overflow valve (5), the second adjustable overflow valve (5) is used for adjusting the back pressure of the remote overflow valve of the rodless cavity of the cylinder, and the rodless cavities of the two lifting cylinders (1) and the hydraulic source form a second hydraulic circuit through the remote overflow valves (6) and the second adjustable overflow valve (5).

5. A dual cylinder safety lifting system as claimed in claim 1, wherein, The mechanical forced synchronization mechanism (2) comprises a lifting plate, and one end of each of the two lifting cylinders (1) is fixedly connected with the two ends of the lifting plate.

6. A dual cylinder safety lifting system as claimed in claim 5, wherein, The pipeline fixing mechanism comprises a bearing slip (8) and a top-preventing slip (9). The bearing slip (8) and the top-preventing slip (9) are fixedly installed on the upper and lower sides of the lifting plate respectively.

Images