Full-bore multistage well cementation fracturing intelligent sliding sleeve

Abstract

The invention belongs to the technical field of oilfield development, and particularly relates to a full-bore multistage well cementation fracturing intelligent sliding sleeve which comprises an upper pile casing, a sliding sleeve assembly, a main machine base and a lower connector. A liquid outlet is formed in the upper pile casing, the sliding sleeve assembly is arranged in the upper pile casing and connected with the upper pile casing, and the sliding sleeve assembly is used for opening or blocking the liquid outlet; the main machine base is arranged at one end of the upper protective cylinder and connected with the upper protective cylinder, and a control assembly and a reversing valve assembly are arranged on the main machine base. The lower connector is arranged at one end of the main machine base and connected with the main machine base. According to the full-bore multi-stage well cementation fracturing intelligent sliding sleeve, high-pressure fracturing fluid enters the sliding sleeve assembly through the reversing valve assembly, the main machine base and a backflow hole channel of the upper protective cylinder, so that a necking ring in the sliding sleeve assembly is necked down, a setting device in the sliding sleeve assembly accurately sets a fracturing layer, the fracturing layer is accurately controlled, sliding sleeve misoperation is reduced, and the fracturing efficiency is improved. And the fracturing operation is accurate and high in efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of oil field development, and in particular relates to a full-diameter multi-stage cementing and fracturing intelligent sliding sleeve. Background Art

[0002] In the field of oil and gas resource exploration and development, with the continuous growth of global energy demand and the increasing depletion of traditional oil and gas resources, the development of unconventional oil and gas fields (such as shale gas, tight oil, etc.) has become the focus of industry attention. However, such oil and gas fields are usually stored in low-permeability and ultra-low-permeability reservoirs, which are difficult to exploit and require advanced fracturing technology to improve recovery.

[0003] Traditional fracturing technology, such as the bridge plug plus sliding sleeve method, has many limitations in the multi-stage fracturing process. First, the use of multiple bridge plugs and sliding sleeves not only increases the complexity of the operation, but also significantly increases the cost. Secondly, each stage of the fracturing operation requires independent perforation, plugging, and unplugging processes. These operations are not only time-consuming, but also prone to errors, reducing the overall operation efficiency. In addition, the traditional sliding sleeve design often limits the diameter of the wellbore, which brings inconvenience to subsequent production and maintenance work.

[0004] Based on the above problems, the present invention proposes a full-diameter multi-stage cementing and fracturing intelligent sliding sleeve. Summary of the invention

[0005] The purpose of the present invention is to provide a full-diameter multi-stage cementing fracturing intelligent sliding sleeve. In order to achieve the above purpose, the technical solution adopted by the present invention is: A full-diameter multi-stage cementing and fracturing intelligent sliding sleeve, comprising: The upper casing is provided with a liquid outlet. A sliding sleeve assembly is arranged in the upper casing and connected to the upper casing, and the sliding sleeve assembly is used to open or block the liquid outlet; A main engine seat is arranged at one end of the upper casing and connected to the upper casing, and a control component and a reversing valve component are arranged on the main engine seat; The lower connector is arranged at one end of the main frame and connected to the main frame.

[0006] Further, the sliding sleeve assembly comprises: The first sliding sleeve is sleeved with the inner hole of the upper casing and connected with the upper casing through a copper pin; A second sliding sleeve, sleeved inside the first sliding sleeve; A sliding sleeve seat, arranged at the bottom of the first sliding sleeve and connected to the first sliding sleeve; The first sliding sleeve, the second sliding sleeve and the sliding sleeve seat together form a gap cavity; The shrinking neck ring is arranged in the sliding sleeve seat, and the shrinking neck ring is matched with the second sliding sleeve.

[0007] Furthermore, the sleeve assembly also includes a sealer, which is used to fit and seal with the necking ring after necking.

[0008] Furthermore, the edge of the lower port of the second sliding sleeve expands outward, and the bottom diameter of the expanded shape is larger than the top diameter.

[0009] Furthermore, the top edge of the necking ring is configured as an inclined surface, and the top edge of the necking ring is matched with the lower port of the second sliding sleeve; and the necking ring is provided with an opening.

[0010] Furthermore, the control component includes: A main control board is arranged on the main engine base; The pressure sensor is arranged on the main frame and connected to the main control board; The motor control board is arranged on the main engine base and connected with the main control board; The battery assembly is arranged on the main base and is connected with the main control board, the pressure sensor and the motor control board.

[0011] Furthermore, the reversing valve assembly comprises: The motor is connected to the motor control board; A transmission shaft connected to the motor through a coupling; A valve stem connected to the transmission shaft; The valve core is adapted to the valve stem; Furthermore, a valve outer tube is arranged outside the valve core, a connecting tube is arranged outside the transmission shaft, one end of the valve outer tube is connected to the connecting tube, a thrust bearing is arranged inside the connecting tube, and the thrust bearing is located at both ends of the transmission shaft shoulder; a motor seat is arranged on one end of the connecting tube, and the motor is arranged on the motor seat through the motor tube; Furthermore, the valve core is connected to a liquid inlet.

[0012] The present invention adopts the above technical solution, which has the following advantages: The invention discloses a full-bore multi-stage cementing fracturing intelligent sliding sleeve. High-pressure fracturing fluid enters the sliding sleeve assembly through the reversing valve assembly, the main engine seat and the backflow hole channel of the upper casing, so that the necking ring in the sliding sleeve assembly shrinks, and the sealing device in the sliding sleeve assembly accurately seals the fracturing layer, so as to achieve accurate control of the fracturing layer, reduce erroneous operation of the sliding sleeve, and ensure accurate and efficient fracturing operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of a full-diameter multi-stage cementing and fracturing intelligent sliding sleeve of the present invention; Figure 2 It is a structural schematic diagram of the reversing valve assembly of the present invention; Figure 3 It is a schematic diagram of the control component structure of the present invention; Figure 4 It is a schematic diagram of the necking ring structure of the present invention.

[0014] The accompanying drawings are marked as follows: 1-upper casing, 2-sleeve assembly, 201-first sleeve, 202-second sleeve, 203-sleeve seat, 204-neck ring, 205-copper pin, 206-gap cavity, 3-main engine seat, 4-control assembly, 401-main control board, 402-pressure sensor, 403-motor control board, 404-battery assembly, 5-reversing valve assembly, 501-motor, 502-drive shaft, 503-valve stem, 504-valve outer tube, 505-connecting pipe, 506-thrust bearing, 507-coupling, 508-motor tube, 509-valve core, 5010-motor seat, 6-lower joint, 7-sealing device, 8-liquid inlet channel, 9-liquid outlet. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0016] In the field of oil and gas resource exploration and development, unconventional oil and gas fields are usually stored in low-permeability and ultra-low-permeability reservoirs. Traditional one-time fracturing technology can no longer meet the needs of efficient exploitation. The present invention proposes a full-diameter multi-stage cementing fracturing intelligent sliding sleeve, which is applied to multi-layer wells. Figure 1-4 As shown, it includes a ground controller, an upper casing 1, a sleeve assembly 2, a main engine base 3 and a lower joint 6; a plurality of liquid outlets 9 are arranged on the upper casing 1, the sleeve assembly 2 is arranged in the upper casing 1 and connected to the upper casing 1, and the sleeve assembly 2 is used to open or block the plurality of liquid outlets 9; the main engine base 3 is arranged at one end of the upper casing 1 and connected to the upper casing 1, and a control assembly 4 and a reversing valve assembly 5 are arranged on the main engine base 3; the lower joint 6 is arranged at one end of the main engine base and connected to the main engine base 3.

[0017] In this embodiment, when fracturing operations are required, the sliding sleeve assembly of the required layer in the well is accurately controlled according to the instructions of the ground controller, and the layer is accurately opened by the ground fracturing vehicle to achieve the purpose of formation fracturing.

[0018] In one embodiment, the sleeve assembly 2 includes a first sleeve 201, a second sleeve 202, a sleeve seat 203, and a neck ring 204; the first sleeve 201 is sleeved with the inner hole of the upper casing 1, and is connected to the upper casing 1 through a copper pin 205; the second sleeve 202 is sleeved in the first sleeve 201; the sleeve seat 203 is arranged at the bottom of the first sleeve 201, and is connected to the first sleeve 201; the first sleeve 201, the second sleeve and the sleeve seat 203 jointly form a gap cavity 206; the neck ring 204 is arranged in the sleeve seat 203, and the neck ring 204 is adapted to the second sleeve 202.

[0019] In this embodiment, in the initial state, the sleeve assembly blocks the liquid outlet on the upper casing, and the high-pressure fracturing fluid enters the gap cavity between the second sleeve and the sleeve seat through the channel, generating a pressure difference to move the second sleeve toward the sleeve seat end, squeezing the necking ring to a necked state.

[0020] In one embodiment, the sleeve assembly 2 further includes a sealer 7, and the sealer 7 is used to fit and seal with the necking ring 204 after necking.

[0021] As a preferred embodiment, the sealing device 7 can use soluble balls. The use of soluble balls has the following advantages: first, the soluble balls can temporarily seal the necking ring; second, the soluble balls are easy to operate during the ball-casting process, with low cost, no need for recovery, and can dissolve by themselves, eliminating the need for traditional sealing and drilling operations, reducing operation time and risks; third, the use of soluble balls can reduce risks, that is, reduce the risk of drill jams, and other materials need to be drilled out in the end; fourth, the use of soluble balls is environmentally friendly and will not pollute the environment.

[0022] In one embodiment, the edge of the lower port of the second sliding sleeve 202 expands outward, and the bottom diameter of the expanded shape is larger than the top diameter.

[0023] As a preferred embodiment, the lower port of the second sliding sleeve 202 can be configured to be in a bell-mouth shape.

[0024] As a preferred embodiment, the lower port of the second sliding sleeve 202 may also be configured to be in a frustum shape with an upper top surface and a lower bottom surface connected therewith.

[0025] In one embodiment, the top edge of the neck ring 204 is configured as an inclined surface, and the top edge of the neck ring 204 is matched with the lower end of the second sliding sleeve 202; the neck ring 204 is provided with an opening.

[0026] Furthermore, the edges of the top edge of the necking ring 204 may be chamfered so that the lower end of the second sliding sleeve 202 fits with the chamfered upper end of the necking ring.

[0027] In this embodiment, the high-pressure fracturing fluid enters the valve core hole, and enters the gap cavity formed by the first sleeve, the second sleeve and the sleeve seat through the channel, generating a pressure difference to move the second sleeve toward the sleeve seat end, and the second sleeve moves downward to squeeze the compression collar. Under the squeezing of the second sleeve, the necking collar shrinks and becomes smaller, and the opening of the necking collar closes, achieving the purpose of necking. Then the ball is thrown to make the soluble ball and the necking collar fit and seal. At this time, the wellhead fracturing vehicle is pressurized, and pressure is formed inside the entire intelligent sleeve, so that the soluble ball pushes the necking collar to move downward continuously, causing the entire sleeve assembly to move downward continuously, forcing the copper pin to break and separate from the sleeve assembly, and the sleeve assembly moves downward as a whole to open the liquid outlet, completing the purpose of opening the sleeve assembly, and the fracturing fluid will enter the formation through the opened liquid outlet to achieve the purpose of fracturing.

[0028] In one embodiment, the control component 4 includes a main control board 401, a pressure sensor 402, a motor control board 403 and a battery assembly 404; the main control board 401 is arranged on the main base 3; the pressure sensor 402 is arranged on the main base 3 and connected to the main control board 401; the motor control board 403 is arranged on the main base 3 and connected to the main control board 401; the battery assembly 404 is arranged on the main base 3 and connected to the main control board 401, the pressure sensor 402 and the motor control board 403.

[0029] In this embodiment, after the pressure sensor receives the wave code communication command sent by the ground controller, it transmits the sensed pressure change to the main control board, and the main control board parses the command to control the reversing valve assembly to perform the action.

[0030] In one embodiment, the reversing valve assembly 5 includes a motor 501, a transmission shaft 502, a valve stem 503 and a valve core 509; the motor 501 is connected to the motor control board 403, and the motor is used to provide power for the opening and closing of the reversing valve assembly. The transmission shaft 502 is connected to the motor 501 through a coupling 507; the coupling is used to transmit the motor power to the transmission shaft. The valve stem 503 is threadedly connected to the transmission shaft 502, and the transmission shaft is used for the transmission displacement of the valve stem to provide motor power to the valve switch; the valve core 509 is adapted to the valve stem 503, and the valve core and the valve stem are combined into a switch valve for performing the opening and closing functions of the valve. The valve core 509 is connected to the liquid inlet channel 8.

[0031] Furthermore, a valve outer tube 504 is arranged outside the valve core 509, and the valve core 509 is fixedly connected to the valve outer tube 504 by being embedded; the valve outer tube 504 plays a role in fixing and protecting the valve core 509. A connecting tube 505 is arranged outside the transmission shaft 502, and the connecting tube 505 plays a role in fixing and protecting the transmission shaft 502, and one end of the valve outer tube 504 is threadedly connected to the connecting tube 505. A thrust bearing 506 is arranged inside the connecting tube 505, and the thrust bearing 506 is located at both ends of the shaft shoulder of the transmission shaft 502; the thrust bearing is used to bear the pressure of the valve stem after the reversing valve assembly is opened, eliminate friction and facilitate the output of the motor torque; a motor seat 5010 is arranged at one end of the connecting tube 505, and the motor seat 5010 is threadedly connected to the connecting tube 505, and the motor 501 is connected to the motor seat 5010 through the motor tube 508, and the motor tube 508 is threadedly connected to the motor seat 5010, and the motor tube is used for connecting and fixing the motor.

[0032] Furthermore, the present invention also applies radio frequency identification (RFID) technology to realize intelligent control of the sleeve assembly, which can realize fracturing construction of any level. Through RFID technology, the ground controller can monitor the status and position of the sleeve assembly in real time to ensure the smooth progress of the entire construction process.

[0033] In the present invention, in the initial state, the sleeve assembly blocks the liquid outlet of the upper casing, the ground controller transmits the wave code communication instruction to the pressure sensor, the pressure sensor transmits the sensed pressure change to the main control board, the main control board analyzes the instruction, controls the motor to rotate, the motor drives the valve stem to move, the valve core channel in the reversing valve assembly is opened, and the high-pressure fracturing liquid enters the reversing valve assembly through the liquid inlet, and then enters the gap cavity formed by the first sleeve, the second sleeve and the sleeve seat along the channel of the reversing valve assembly, thereby generating a pressure difference to move the second sleeve toward the sleeve seat end and squeeze the neck ring to a necked state; then a soluble ball is put in; the soluble ball and the neck ring are sealed together, at this time the wellhead fracturing vehicle is pressurized, the copper pin is sheared off by hydraulic pressure, the sleeve assembly moves downward as a whole to open the liquid outlet, and the purpose of opening the sleeve assembly is completed, and then the fracturing fluid will enter the formation through the opened liquid outlet to start fracturing operation, thereby achieving the purpose of fracturing.

Claims

1. A full-bore multi-stage cementing and fracturing intelligent sliding sleeve, characterized in that: include: An upper casing (1), wherein the upper casing (1) is provided with a liquid outlet (9), A sliding sleeve assembly (2) is arranged in the upper casing (1) and connected to the upper casing (1), and the sliding sleeve assembly (2) is used to open or block the liquid outlet (9); A main engine base (3) is arranged at one end of the upper casing (1) and is connected to the upper casing (1); a control component (4) and a reversing valve component (5) are arranged on the main engine base (3); A lower joint (6) is arranged at one end of the main engine base (3) and is connected to the main engine base (3).

2. The full-bore multi-stage cementing fracturing intelligent sliding sleeve according to claim 1, characterized in that: The sliding sleeve assembly (2) comprises: A first sliding sleeve (201) is sleeved with the inner hole of the upper casing (1) and connected to the upper casing (1) via a copper pin (205); A second sliding sleeve (202) is sleeved inside the first sliding sleeve (201); A sliding sleeve seat (203), arranged at the bottom of the first sliding sleeve (201) and connected to the first sliding sleeve (201); The first sliding sleeve (201), the second sliding sleeve (202) and the sliding sleeve seat (203) together form a gap cavity (206); The shrinking collar (204) is arranged in the sliding sleeve seat (203), and the shrinking collar (204) is adapted to the second sliding sleeve (202).

3. The full-bore multi-stage cementing fracturing intelligent sliding sleeve according to claim 2, characterized in that: The sleeve assembly (2) further comprises a setting device (7), wherein the setting device (7) is used to fit and seal with the necking ring (204) after necking.

4. The full-bore multi-stage cementing fracturing intelligent sliding sleeve according to claim 3, characterized in that: The edge of the lower port of the second sliding sleeve (202) expands outwards, and the bottom diameter of the expanded shape is larger than the top diameter.

5. A full-bore multi-stage cementing fracturing intelligent sliding sleeve according to claim 2 or 4, characterized in that: The top edge of the necking ring (204) is arranged as an inclined surface, and the top edge of the necking ring (204) is adapted to the lower end port of the second sliding sleeve (202); the necking ring (204) is provided with an opening.

6. The full-bore multi-stage cementing fracturing intelligent sliding sleeve according to claim 5, characterized in that: The control component (4) comprises: A main control board (401), arranged on the main base (3); A pressure sensor (402) is arranged on the main base (3) and connected to the main control board (401); A motor control board (403) is arranged on the main base (3) and connected to the main control board (401); A battery assembly (404) is arranged on the main base (3) and is connected to the main control board (401), the pressure sensor (402) and the motor control board (403).

7. The full-bore multi-stage cementing fracturing intelligent sliding sleeve according to claim 6, characterized in that: The reversing valve assembly (5) comprises: A motor (501) connected to the motor control board (403); A transmission shaft (502) connected to the motor (501) via a coupling (507); A valve stem (503) connected to the transmission shaft (502); The valve core (509) is adapted to the valve stem (503).

8. The full-bore multi-stage cementing fracturing intelligent sliding sleeve according to claim 7, characterized in that: An outer valve tube (504) is arranged outside the valve core (509), and a connecting tube (505) is arranged outside the transmission shaft (502); one end of the outer valve tube (504) is connected to the connecting tube (505), and a thrust bearing (506) is arranged inside the connecting tube (505), and the thrust bearing (506) is located at both ends of the shaft shoulder of the transmission shaft (502); a motor seat (5010) is arranged on one end of the connecting tube (505), and the motor (501) is arranged on the motor seat (5010) through a motor tube (508).

9. The full-bore multi-stage cementing fracturing intelligent sliding sleeve according to claim 8, characterized in that: The valve core (509) is connected to a liquid inlet (8).

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