A fracturing temporary plugging agent delivery device and working method thereof

Abstract

The present invention discloses a fracturing temporary plugging agent delivery device and a working method thereof, the device comprises a delivery device body, a storage bin is provided above the delivery device body, a narrow neck is formed at the bottom of the storage bin, a counter located inside the storage bin is installed in the narrow neck, a manipulator is provided in the delivery device body, the manipulator is located below the narrow neck, and a check valve is provided at one end of the manipulator. The fracturing temporary plugging agent delivery device of the present invention is used to deliver the temporary plugging ball from the low-pressure channel to the high-pressure channel during the delivery process, and during the whole process, two sets of sealing mechanisms are switched in the order of successive substitution, so as to ensure that the high-pressure liquid does not overflow and leak, thereby ensuring the safety of the equipment and operation.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field development, in particular to a fracturing temporary plugging agent delivery device. Background Art

[0002] Fracturing is a commonly used production-increasing measure in the development of oil and gas fields. In particular, fracturing transformation is necessary for the development of low-permeability oil and gas reservoirs to achieve better results.

[0003] During the construction process, on the basis of crack opening, it is necessary to put temporary plugging agents to produce filter cake bridges at the cracks or high permeability layers, so that subsequent working fluid cannot enter, and promote the re-pressing of new cracks, the opening of new longitudinal layers, and the redirection of plane cracks. Since a high-strength filter cake layer needs to be produced, the strength of the granular temporary plugging agent is required to be high. If it is added from the sand mixing equipment, the granular temporary plugging agent will damage the pump head of the pumping equipment during the pumping process; and the high-pressure dosing device directly added to the high-pressure manifold is large and bulky, and the dosage is still limited, and a large amount of granular temporary plugging agent remains during the addition process. Therefore, the commonly used method at the operation site is to release the pressure of the high-pressure manifold, push the granular temporary plugging agent to the high-pressure manifold, and then use the pumping equipment to pump the liquid to push the granular temporary plugging agent into the wellbore, so that the granular temporary plugging agent no longer passes through the pumping equipment, avoiding damage to the pump head of the pumping equipment.

[0004] Moreover, the commonly used temporary plugging agents are in the form of solid balls or fiber knots, which cannot pass through the high-pressure pump head and need to be delivered from the high-pressure pipeline at the rear end. When delivering the temporary plugging agent, it is necessary to avoid accumulation or entanglement in the pipeline and to have technical intervals during delivery.

[0005] Therefore, it is of great significance to design a new type of fracturing temporary plugging agent delivery device to solve the problem of safe delivery of temporary plugging agents in fracturing operations. Summary of the invention

[0006] The purpose of the present invention is to provide a fracturing temporary plugging agent delivery device and a working method thereof.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0008] A fracturing temporary plugging agent delivery device comprises a delivery device body, a storage bin is provided above the delivery device body, a narrow neck is formed at the bottom of the storage bin, a counter located inside the storage bin is installed in the narrow neck, a manipulator is provided in the delivery device body, the manipulator is located below the narrow neck, and a check valve is provided at one end of the manipulator.

[0009] Wherein, a ball passing channel parallel to the axial direction of the thin neck is opened on the inner wall surface of the thin neck, and the cross section of the ball passing channel is approximately semicircular.

[0010] The counter is cylindrical, and the outer wall surface where the counter matches the narrow neck is provided with a spiral groove extending spirally from top to bottom around the wall surface, the number of turns of the spiral groove around the wall surface is at least 1, and the cross-section of the spiral groove is approximately semicircular, and a temporary blocking ball is stored in the cavity formed by each circle of the spiral groove and the ball passing channel; the cavity formed by the spiral groove and the ball passing channel at the bottom is connected to the delivery channel in the delivery device body.

[0011] Among them, one end of the manipulator is connected to a screw rod, and the screw rod is driven to rotate by a motor, thereby driving the manipulator to reciprocate.

[0012] Among them, the one-way valve is equipped with a sealing ring and a valve plate, the valve body of the one-way valve is a T-shaped three-way structure, one end of the one-way valve is connected to the main channel, and the two ends of the main channel are union threads connected to the fracturing pipeline of the pump truck.

[0013] The upper part of the storage bin is a cylindrical barrel, and the lower part is funnel-shaped; a loading port is provided at the top of the storage bin.

[0014] The manipulator and the main channel are in the same plane, the axial direction of the manipulator is perpendicular to the axial direction of the main channel, the manipulator is connected to the delivery device body through a flange, and is driven by a servo motor.

[0015] Wherein, the storage bin is arranged vertically and fixed on the delivery device body through a flange connection; the upper end of the counter is connected and fixed to the cover plate on the top of the storage bin by a bearing box, and the counter is driven by a stepper motor.

[0016] The device also includes a controller, which is connected to all motors through cables and controls the operation of the motors.

[0017] The working method of the temporary fracturing plugging agent delivery device of the present invention is characterized by comprising the following steps:

[0018] (1) The motor drives the screw to drive the manipulator to make linear reciprocating motion, pushing the temporary blocking ball sent into the delivery channel forward. The manipulator first contacts the sealing ring to isolate the delivery channel from the storage bin;

[0019] (2) The manipulator continues to move forward, pushes open the valve plate of the check valve, and sends the temporary blocking ball into the main channel;

[0020] (3) After reaching the top, the manipulator begins to retract, and the valve plate rebounds and closes first, ensuring that the high-pressure liquid in the delivery channel and the main channel remain isolated. Then the manipulator continues to retreat, disengaging the sealing ring and returning to its original position;

[0021] (4) The counter is controlled by a stepper motor, and steps (1) to (3) are repeated according to the time period required by the construction to perform the ball delivery action.

[0022] Compared with the prior art, the outstanding effects of the present invention are:

[0023] (1) The temporary plugging agent delivery device of the present invention solves the problem of safe delivery of temporary plugging agents during fracturing operations. It can deliver temporary plugging agents automatically without stopping the pump during high-pressure operations. The entire device improves operation safety through remote control and automatic control.

[0024] (2) The fracturing temporary plugging agent delivery device of the present invention realizes both automatic counting and the purpose of intermittent delivery of temporary plugging balls. During the delivery process, the temporary plugging balls are sent from the low-pressure channel to the high-pressure channel. During the whole process, two sets of sealing mechanisms are switched in the order of replacement, ensuring that the high-pressure liquid does not overflow and leak, thereby ensuring the safety of equipment and operations.

[0025] The fracturing temporary plugging agent delivery device and the working method thereof according to the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional view of a fracturing temporary plugging agent delivery device;

[0027] Figure 2 It is a three-dimensional half-section schematic diagram of a storage bin;

[0028] Figure 3 It is a partial cross-sectional view of a fracturing temporary plugging agent delivery device;

[0029] Figure 4 For along Figure 3 Top view in the “AA” direction;

[0030] Figure 5 A three-dimensional half-section schematic diagram of the coordination relationship between the storage bin and the counter;

[0031] Figure 6 It is a three-dimensional schematic diagram of the lower part of the counter.

[0032] Among them, 1-storage bin; 2-loading port; 3-counter; 4-delivery device body; 5-screw; 6-manipulator; 7-sealing body; 8-sealing ring; 9-valve plate; 10-valve body; 11-check valve; 12-neck;

[0033] 101 - ball passage; 102 - main passage; 103 - spiral groove. DETAILED DESCRIPTION

[0034] like Figure 1-6As shown, a fracturing temporary plugging agent delivery device includes a delivery device body 4, a storage bin 1 is provided above the delivery device body 4, a narrow neck 12 is formed at the bottom of the storage bin 1, a counter 3 located inside the storage bin 1 is installed in the narrow neck 12, a manipulator 6 is provided in the delivery device body 4, the manipulator 6 is located below the narrow neck 12, and a check valve 11 is provided at one end of the manipulator 6.

[0035] The inner wall surface of the thin neck 12 is provided with a ball passage 101 parallel to the axial direction of the thin neck 12, and the cross section of the ball passage 101 is approximately semicircular. The counter 3 is cylindrical, wherein the outer wall surface of the counter 3 and the thin neck 12 is provided with a spiral groove 103 extending from top to bottom around the wall surface in a spiral shape, and the number of turns of the spiral groove 103 around the wall surface is at least 1 circle, and the cross section of the spiral groove 103 is approximately semicircular, and a temporary blocking ball is stored in the cavity formed by each circle of the spiral groove 103 and the ball passage 101; the cavity formed by the spiral groove 103 and the ball passage 101 at the bottom is located directly above the delivery channel in the delivery device body 4, and is connected to each other.

[0036] The ball passing channel 101 on the narrow neck 12 and the spiral groove 103 on the counter 3 are combined together to form a complete ball delivery channel.

[0037] One end of the manipulator 6 is connected to the screw 5, and the screw 5 is driven by a motor to rotate, thereby driving the manipulator 6 to reciprocate along the delivery channel in the delivery device body 4. The manipulator 6 and the main channel 102 are in the same plane, and the axial direction of the manipulator 6 is perpendicular to the axial direction of the main channel 102. The manipulator 6 is connected to the delivery device body 4 through a flange and driven by a servo motor. The manipulator 6 can be in the form of a screw.

[0038] A one-way valve 11 is installed on the delivery channel in the delivery device body 4, and a sealing ring 8 and a valve plate 9 are installed in the one-way valve 11. The valve body 10 of the one-way valve 11 is a T-shaped three-way structure. One end of the one-way valve 11 is connected to the main channel 102. Both ends of the main channel 102 are union threads and are connected to the fracturing pipeline of the pump truck.

[0039] The upper part of the storage bin 1 is a cylindrical barrel, and the lower part is funnel-shaped; a loading port 2 is provided at the top of the storage bin 1. The storage bin 1 is arranged vertically and is fixed to the delivery device body 4 by a flange connection; the upper end of the counter 3 is connected and fixed to the cover plate at the top of the storage bin 1 by a bearing box, and the counter 3 is driven by a stepper motor.

[0040] The utility model also comprises a controller, which is connected with all the motors through cables and controls the operation of the motors.

[0041] The fracturing temporary plugging agent delivery device has a ball passage 101 arranged in the axial direction on the narrow neck 12 at the lower end of the storage bin. By using the gravity of the spherical material, the temporary plugging ball can automatically slide down along the funnel-shaped slope at the lower part of the storage bin 1 and enter the top of the ball passage 101 of the narrow neck 12. The counter 3 rotates to roll the temporary plugging ball that falls into the top of the ball passage 101 into the spiral groove 103, and then the temporary plugging ball can only be arranged vertically in the ball passage 101. Each circle of the spiral groove 103 on the counter 3 separates the vertically arranged temporary plugging balls. After the counter 3 rotates one circle, a temporary plugging ball falls from the end of the spiral groove and enters the delivery channel in the delivery device body 4, and at the same time, another temporary plugging ball enters from the top of the ball passage 101. This action is repeated, which not only realizes automatic counting, but also achieves the purpose of intermittent delivery of temporary plugging balls.

[0042] In this process, half of each temporary blocking ball is in the ball passage and will not rotate with the counter, and the other half is in the spiral groove of the counter. Therefore, when the counter rotates, the spiral groove rotates and drives the temporary blocking ball to move downward along the ball passage. Because each circle of spiral grooves distributed on the outer wall of the counter has an overlap point with the ball passage, a complete cavity will be formed at this overlap point to accommodate the temporary blocking ball, so that the temporary blocking ball will be separated by the spiral groove on the counter in the ball passage.

[0043] The fracturing temporary plugging agent delivery device also has a safe and reliable compensating sealing device. The manipulator pushes the temporary plugging ball entering the delivery channel forward, first entering the sealing ring, so that the delivery channel moves forward to the front end of the sealing ring and is isolated from the storage bin, ensuring that the liquid does not overflow to the rear end of the sealing ring, ensuring the safety of the low-pressure end. Then, the manipulator continues to move forward to push open the valve plate of the check valve, connect with the high-pressure channel, and the temporary plugging ball enters the high-pressure channel. After reaching the top, the manipulator retracts and retreats, the valve plate of the check valve is closed by the spring force, and the thrust of the high-pressure liquid pre-tightens and seals the valve plate, the delivery channel is disconnected from the high-pressure channel, and the low pressure is restored. The manipulator continues to retract and disengages from the sealing ring and returns to its original position. During the delivery process, the temporary plugging ball is sent from the low-pressure channel to the high-pressure channel. During the whole process, two sets of sealing mechanisms are switched in the order of replacement, ensuring that the high-pressure liquid does not overflow and leak, ensuring the safety of equipment and operations.

[0044] The working method of the fracturing temporary plugging agent delivery device comprises the following steps:

[0045] (1) The motor drives the screw to drive the manipulator to make linear reciprocating motion, pushing the temporary blocking ball sent into the delivery channel forward. The manipulator first contacts the sealing ring to isolate the delivery channel from the storage bin;

[0046] (2) The manipulator continues to move forward, pushes open the valve plate of the check valve, and sends the temporary blocking ball into the main channel;

[0047] (3) After reaching the top, the manipulator begins to retract, and the valve plate rebounds and closes first, ensuring that the high-pressure liquid in the delivery channel and the main channel remain isolated. Then the manipulator continues to retreat, disengaging the sealing ring and returning to its original position;

[0048] (4) The counter is controlled by a stepper motor, and steps (1) to (3) are repeated according to the time period required by the construction to perform the ball delivery action.

[0049] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A working method of a fracturing temporary plugging agent delivery device, characterized in that: The fracturing temporary plugging agent delivery device comprises a delivery device body (4), a storage bin (1) is provided above the delivery device body (4), a narrow neck (12) is formed at the bottom of the storage bin (1), a counter (3) located inside the storage bin (1) is installed in the narrow neck (12), a manipulator (6) is provided in the delivery device body (4), the manipulator (6) is located below the narrow neck (12), and a check valve (11) is provided at one end of the manipulator (6); a sealing ring (8) and a valve plate (9) are installed in the check valve (11), a valve body (10) of the check valve (11) is a T-shaped three-way structure, one end of the check valve (11) is connected to a main channel (102), both ends of the main channel (102) are union threads, and are connected to the fracturing pipeline of the pump truck. The storage bin (1) is connected to the main channel (102); the upper part of the storage bin (1) is a cylindrical barrel, and the lower part is funnel-shaped; a loading port (2) is provided at the top of the storage bin (1); the storage bin (1) is arranged vertically and is fixed to the delivery device body (4) by a flange connection; the upper end of the counter (3) is connected and fixed to the cover plate at the top of the storage bin (1) by a bearing box, and the counter (3) is driven by a stepping motor; the manipulator (6) and the main channel (102) are in the same plane, the axial direction of the manipulator (6) is perpendicular to the axial direction of the main channel (102), the manipulator (6) is connected to the delivery device body (4) by a flange, and is driven by a servo motor; one end of the manipulator (6) is connected to the screw (5); a delivery channel is provided in the delivery device body (4); Its working method includes the following steps: (1) The servo motor drives the screw to drive the manipulator to make linear reciprocating motion, pushing the temporary blocking ball sent into the delivery channel forward. The manipulator first contacts the sealing ring to isolate the delivery channel from the storage bin; (2) The manipulator continues to move forward, pushes open the valve plate of the check valve, and sends the temporary blocking ball into the main channel; (3) After reaching the top, the manipulator begins to retract, and the valve plate rebounds and closes first, ensuring that the high-pressure liquid in the delivery channel and the main channel are isolated. Then the manipulator continues to retreat, disengaging the sealing ring and returning to its original position; (4) The counter is controlled by a stepper motor, and steps (1) to (3) are repeated according to the time period required by the construction to perform the ball sending action.

2. The working method of the fracturing temporary plugging agent delivery device according to claim 1, characterized in that: A ball-passing channel (101) parallel to the axial direction of the thin neck (12) is provided on the inner wall surface of the thin neck (12), and the cross section of the ball-passing channel (101) is approximately semicircular.

3. The working method of the temporary fracturing plugging agent delivery device according to claim 2, characterized in that: The counter (3) is cylindrical, wherein the outer wall surface of the counter (3) matching the narrow neck (12) is provided with a spiral groove (103) extending from top to bottom around the wall surface in a spiral shape, the number of turns of the spiral groove (103) around the wall surface is at least one, the cross section of the spiral groove (103) is approximately semicircular, and a temporary blocking ball is stored in a cavity formed by each circle of the spiral groove (103) and the ball passage channel (101); the cavity formed by the lowest circle of the spiral groove (103) and the ball passage channel (101) is connected to the delivery channel in the delivery device body (4).

4. The working method of the fracturing temporary plugging agent delivery device according to claim 1, characterized in that: The fracturing temporary plugging agent delivery device also includes a controller, which is connected to all motors through cables and controls the operation of the motors.

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