Electrically controlled delayed opening type tubing plug for pressure operation of oil and gas wells

Abstract

The utility model relates to an oil and gas well pressure operation electric control delay opening type oil pipe inner plug device, including cylinder, the inside of cylinder is equipped with transmission mechanism, piston and be used to set up drive mechanism of delay start, the piston with transmission mechanism fixed connection, the upper end of cylinder is used for with oil pipe connection, the upper part of cylinder is equipped with the long groove shape overflow passage of many circumferences even distribution, after delay program execution, drive mechanism output power drives transmission mechanism movement, transmission mechanism drives piston axial movement in the air cavity inside cylinder. Set up delay time in drive mechanism, realize the delay opening of flow passage through transmission mechanism drive piston, reach oil pipe column bottom and shaft lining delay intercommunication, realize the safety of operation.

Description

Technical Field

[0001] This utility model relates to the field of downhole operations in oil and gas engineering, and more specifically, to an electrically controlled delayed-opening tubing plugging device for pressurized oil and gas well operations. Background Technology

[0002] Live pressure operation in oil and gas wells refers to a downhole operation technique that involves running and pulling tubing while maintaining a certain pressure within the wellbore, without the need for well control or depressurization to zero. Using live pressure operation in oil and gas wells helps prevent damage to the pressure system of oil and gas-bearing formations, maintains the near-original state of the formation, and promotes long-term formation stability and sustainable, efficient development. During live pressure operation, sealing the bottom of the tubing string to ensure no pressure inside the string is crucial. Traditionally, this is achieved using tools such as ceramic fracturing discs and mechanical plugs.

[0003] These types of rupture discs or plugs are all made by lowering the tubing string with a plugging tool to a predetermined depth, filling the tubing string with clean water, and then applying a certain pump pressure at the wellhead. The hydraulic pressure in the tubing is transmitted to the rupture disc or plug. When the opening pressure of the rupture disc or plug's core shear pin is reached, the plugging tool is opened, achieving the purpose of connecting the bottom of the tubing string with the wellbore annulus.

[0004] The need to fill the tubing string with water to conduct fluid pressure is crucial for opening the plugging tool. However, at the moment of opening, all the fluid pressure is applied to the wellbore, effectively creating a hydraulic kill effect. This often results in the formation being "killed," leading to the well stopping production. Especially in the later stages of shale oil and gas field development, as formation pressure continues to decline, using water to pressurize and open the plugging tool in the tubing can cause many wells to be "killed," requiring gas lift equipment for gas-assisted fluid removal to restore normal production. This recovery process inevitably leads to wasted energy resources and increased development costs. Furthermore, the current method of opening the plugging tool by filling it with water requires the assistance of surface pump trucks and water tankers, increasing the complexity of the operation and dependence on surface equipment. This results in inconvenient operation, long construction periods, and high costs. Summary of the Invention

[0005] The technical problem this invention aims to solve is that, when conventional plugging devices are opened, the entire liquid column pressure is applied to the wellbore of the oil and gas well, causing the oil and gas formation to be "crushed" and production to stop.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is an electrically controlled delayed-opening tubing plugging device for live oil and gas well operations, including a cylinder. The cylinder is equipped with a transmission mechanism, a piston, and a drive mechanism for setting a delayed start. The piston is fixedly connected to the transmission mechanism. The upper end of the cylinder is used to connect to the tubing. The upper part of the cylinder is provided with multiple circumferentially distributed long groove-shaped flow channels. After the delay program is completed, the drive mechanism outputs power to drive the transmission mechanism to move. The transmission mechanism drives the piston to move axially within the air cavity inside the cylinder.

[0007] According to the above scheme, the drive mechanism includes a battery, a circuit board and a motor. The battery powers the circuit board and the motor. The circuit board is connected to the motor starting circuit. The circuit board is used to set a delayed start time. After the delay time is over, the motor starting circuit is automatically connected, and the motor drives the transmission mechanism to move.

[0008] According to the above scheme, the transmission mechanism is a gear and rack transmission mechanism. The motor output shaft is connected to a reducer. The reducer drives the gear to rotate, which is used to drive the rack to move. The rack drives the piston to move axially in the air cavity inside the cylinder.

[0009] According to the above scheme, a backup opening mechanism is also included. The backup opening mechanism includes a sealing ball seat connected to the top of the piston. A ball is dropped into the oil pipe. After the ball sits on the sealing ball seat on the top of the piston, water is injected into the oil pipe and hydraulic pressure is applied to force the piston to move downward.

[0010] The electrically controlled delayed-opening tubing plugging device for live oil and gas well operations according to this utility model has the following beneficial effects: Before the tubing string with the electrically controlled internal plugging device is lowered into the well for construction operations, the opening time is preset on the ground, which is the timed delay required for opening. After the electrically controlled internal plugging device is lowered into the well to the designated depth, the wellhead oil and gas production equipment is reinstalled. When the preset opening time is reached, i.e., the timed delay required for opening, the electrically controlled internal plugging device automatically opens the flow channel, achieving the effect of connecting the bottom of the tubing string with the wellbore annulus. This allows for the safe lowering of the tubing string into the well under pressure in high-pressure oil and gas wells, and enables timed sealing and opening of the tubing for flow.

[0011] This invention automatically opens the tubing flow channel based on a preset delay time on the ground, achieving communication between the bottom of the tubing string and the wellbore annulus. This avoids the problem of traditional plugging tools requiring the tubing to be filled with water to "crush" the oil and gas formation, causing the well to stop flowing and stop production, and also avoids the need to use gas lift resources to resume production of the oil and gas well.

[0012] Because there is high-pressure oil, gas and water medium in the annulus between the well casing and the tubing, when the electrically controlled internal blocking device is automatically opened, the tubing is completely empty and the pressure is close to zero, while there is high pressure outside the well casing and tubing. Therefore, under the action of the high pressure difference between the inside and outside of the tubing, the high-pressure oil, gas and water medium will rush into the tubing, achieving the effect of stimulating and inducing flow in the tubing, which is more conducive to the continuous and stable production of the flowing well.

[0013] This invention automatically opens the tubing flow channel based on a preset delay time on the ground, achieving communication between the bottom of the tubing string and the wellbore annulus. It eliminates the need for surface-mounted pump trucks and water tankers, completely avoiding dependence on surface equipment. The downhole timed automatic opening is simple to operate and more adaptable. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of the oil pipe plugging device of this utility model; Figure 2 yes Figure 1 A schematic diagram of the external outline; Figure 3 yes Figure 1 A schematic diagram of a half-section structure; Figure 4 yes Figure 1 Internal structure diagram; In the diagram: 1-Cylinder, 2-Piston, 3-Transmission mechanism, 4-Guide head, 5-Reducer, 6-Motor, 7-Battery pack, 8-Circuit board, 9-Flow channel, 10-Air cavity. Detailed Implementation

[0015] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0016] This utility model relates to an electrically controlled delayed-opening tubing plugging device for live oil and gas well operations. Based on production requirements, it can electrically and timedly control the connection between the tubing and the annulus, thereby achieving sealing and opening of the flow passage within the tubing.

[0017] The oil pipe plugging device consists of three parts: a drive mechanism, a transmission mechanism, and a housing. It enables the oil pipe plugging device to open at regular intervals, thereby achieving the purpose of interconnection between the oil and the casing.

[0018] like Figure 1As shown, the drive mechanism includes a battery pack 7, a circuit board 8, a motor 6, and a reducer 5. The battery pack 7 and the circuit board 8 are connected end-to-end to form a closed loop, providing power to the electronically controlled blocking device. The circuit board 8 is connected to the motor 6 and controls its operation. The motor 6 is connected to the reducer 5 via its output shaft to slow down the rotation speed.

[0019] like Figure 2 As shown, the outer casing includes a guide head 4, a cylinder 1, and a piston 2. Multiple circumferentially distributed elongated groove-shaped flow channels 9 are machined on the cylinder 1 to facilitate communication between the oil pipe and the annulus. The total flow area of ​​the flow channels 9 is much larger than the flow area of ​​the oil pipe, thus avoiding throttling losses in the oil pipe.

[0020] like Figure 3 As shown, piston 2 is placed inside cylinder 1, and one end of cylinder 1 is threadedly connected to guide head 4, forming a compressible air cavity 10 inside the electrical control blocking device. The air in air cavity 10 can be compressed, and when the transmission mechanism moves down into air cavity 10, it will not cause pressure buildup. Guide head 4 has a taper to guide the device smoothly into the well shaft and avoid jamming during the descent.

[0021] like Figure 4 As shown, the transmission mechanism converts the rotary motion of the reducer into downward linear motion. The transmission mechanism can be a rack and pinion drive. Piston 2 is fixedly connected to the transmission mechanism, which drives piston 2 downward. The drive mechanism, transmission mechanism, and piston 2 are all installed inside the air cavity.

[0022] The method of using the electrically controlled delayed-opening tubing plugging device for live oil and gas well operations is as follows: S1. Before construction, set the internal blockage device of the electrical control to the closed state of the overflow channel 9, and pre-set the time required to lower all the oil pipes and the additional safety time.

[0023] S2. Connect the electronically controlled internal plugging device to the bottom of the tubing string via threads, and lower the electronically controlled internal plugging device into the wellbore to the specified depth.

[0024] S3. When the electronically controlled internal plugging device is lowered to the designated depth and the wellhead oil and gas production device is reinstalled, the electronically controlled internal plugging device will automatically open the flow channel after the preset opening time is reached, i.e. the timed delay required for opening, so as to achieve the purpose of connecting the bottom of the tubing string with the wellbore annulus.

[0025] S4. Opening process of the internal blockage device in electronic control: Motor 6 drives reducer 5 to rotate, and reducer 5 drives the transmission mechanism to move downward, thereby realizing the downward movement of piston 2.

[0026] S5. After piston 2 moves down, the flow passage 9 gradually opens, and the high-pressure oil, gas and water medium in the wellbore enters the tubing through the flow passage 9, realizing the interconnection between the tubing and the casing.

[0027] S6. When the overflow channel 9 reaches the fully open state, the motor 6 stops moving, and the internal blocking device of the electronic control changes from the sealed blocking state to the fully open state, and the work ends.

[0028] S7. Ball-launching and pressurization backup opening process of the electronically controlled internal blockage device: The core function of this electronically controlled internal blockage device is to open the flow channel with an electronic delay timer, but it is also designed with a ball-launching and pressurization backup opening function. That is, the piston top is equipped with an integrated sealing ball seat structure. In extreme cases, a ball can be launched through the oil pipe. After the ball lands on the sealing ball seat on the piston top, water is injected through the oil pipe and hydraulic pressure is applied to force the piston to move downward, thereby forcibly opening the flow channel on the cylinder and realizing the complete opening of the electronically controlled internal blockage device.

[0029] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A electrically controlled, time-delayed, in-tubing plugging device for pressurized oil and gas well operations, characterized in that, The device includes a cylinder, inside which is provided a transmission mechanism, a piston, and a drive mechanism for setting a delay start. The piston is fixedly connected to the transmission mechanism. The upper end of the cylinder is used to connect to an oil pipe. The upper part of the cylinder is provided with multiple circumferentially distributed long groove-shaped flow channels. After the delay program is completed, the drive mechanism outputs power to drive the transmission mechanism to move. The transmission mechanism drives the piston to move axially within the air cavity inside the cylinder.

2. The electrically controlled delayed-opening tubing plugging device for pressurized oil and gas well operations according to claim 1, characterized in that, The drive mechanism includes a battery, a circuit board, and a motor. The battery powers the circuit board and the motor. The circuit board is connected to the motor starting circuit. The circuit board is used to set a delayed start time. After the delay time ends, the motor starting circuit is automatically connected, and the motor drives the transmission mechanism to move.

3. The electrically controlled delayed-opening tubing plugging device for live oil and gas well operations according to claim 1, characterized in that, The transmission mechanism is a gear and rack transmission mechanism. The motor output shaft is connected to a reducer. The reducer drives the gear to rotate, which drives the rack to move. The rack drives the piston to move axially in the air cavity inside the cylinder.

4. The electrically controlled delayed-opening tubing plugging device for pressurized oil and gas well operations according to claim 1 or 3, characterized in that, The transmission mechanism converts the rotational motion of the motor into the linear motion of the piston.

5. The electrically controlled delayed-opening tubing plugging device for live oil and gas well operations according to claim 1, characterized in that, It also includes a backup opening mechanism, which includes a sealing ball seat connected to the top of the piston. A ball is dropped into the oil pipe, and after the ball sits on the sealing ball seat on the top of the piston, water is injected into the oil pipe and hydraulic pressure is applied to force the piston to move downward.

6. The electrically controlled delayed-opening tubing plugging device for live oil and gas well operations according to claim 1, characterized in that, The upper end of the cylinder is provided with a sealing thread for connection with the oil pipe.

7. The electrically controlled delayed-opening tubing plugging device for live oil and gas well operations according to claim 1, characterized in that, The lower end of the cylinder is provided with a tapered guide head.

8. The electrically controlled delayed-opening tubing plugging device for live oil and gas well operations according to claim 7, characterized in that, The cylinder and the guide head are connected by threads.

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