Infinite intelligent regulation and control fracturing sliding sleeve

Abstract

The invention relates to an infinite intelligent regulation and control fracturing sliding sleeve which is particularly suitable for development of unconventional oil and gas resources such as shale gas and tight oil. The concrete structure of the infinite intelligent regulation and control fracturing sliding sleeve dart part comprises an outer shell, a lower baffle disc, an upper baffle disc, a bolt, a spring, a clamping ring, a blocking ball, a thrust block, a thrust bearing, a flow dividing block, a motor, a flow divider, a capacitive sensor, a silicon rubber sealing piece, a control module and a flow divider end cover. When the infinite intelligent control fracturing sliding sleeve dart part passes through a designated position, the infinite intelligent control fracturing sliding sleeve dart part judges and counts each part needing to be fractured through the three capacitive sensors, when a preset value is reached, the tool is switched to an activated state, the blocking ball is impacted under the pressure of drilling fluid, and the part needing to be fractured is fractured. The thrust block is pushed, the thrust block opens the piston on the casing pipe under the pressure building effect, and fracturing operation is achieved. And the limitation of the size of a steel ball in the traditional ball throwing type sliding sleeve technology is avoided, the operation complexity is reduced, the construction efficiency is improved, and a new technical means is provided for efficient development of unconventional oil gas.

Description

Technical Field

[0001] The invention relates to a tool for exploiting resources such as petroleum and natural gas, and in particular to a full-bore fracturing sleeve, belonging to the technical field of oil and gas field fracturing. Background Art

[0002] As global energy demand continues to grow, the oil and gas industry faces increasingly complex mining challenges, especially the rapid increase in the demand for the development of unconventional oil and gas resources. The reservoir characteristics of unconventional oil and gas resources (such as shale gas and tight oil) are completely different from those of conventional oil and gas reservoirs. They usually have low permeability and low porosity, which makes the oil and gas mobility extremely poor and cannot be efficiently developed through traditional completion and production technologies. Therefore, how to effectively improve the recovery rate of unconventional oil and gas reservoirs has become a key issue that the global oil and gas industry needs to solve. Against this background, staged fracturing technology has rapidly emerged and become an important means of developing unconventional oil and gas reservoirs. Staged fracturing technology uses fracturing fluid to break the rocks in the formation and form a complex fracture network, thereby providing more channels for oil and gas flow. This technology can greatly improve the recovery rate of the reservoir, allowing unconventional oil and gas resources that are difficult to exploit to be commercially developed. Among all staged fracturing technologies, the ball-dropping sliding sleeve technology is particularly common, and is widely used in horizontal wells and multi-stage fracturing wells due to its advantages of simple operation and high operating efficiency. However, one of the core challenges of the ball-throwing sleeve technology is the limitation of its steel ball size. In this technology, the sleeve of each well section relies on the steel ball entering the ball seat to trigger the opening of the sleeve. The size of the sleeve ball seat of different well sections needs to be increased in sequence to ensure that the steel balls can be inserted into their respective ball seats in sequence and complete the opening of the sleeve. Therefore, the steel balls are thrown in from small to large, and each sleeve corresponds to a steel ball of a specific size. Although this design achieves controllable multi-stage fracturing in operation, it also brings obvious limitations. As the number of fracturing stages increases, the difference in steel ball size gradually decreases, and the precision requirements for operation are getting higher and higher. A slight deviation may cause the sleeve to fail to open normally or the steel ball to fail to fully embed into the ball seat. Faced with these challenges, the oil and gas industry is in urgent need of an innovative fracturing tool that can break through the limitations of traditional ball-throwing sleeve technology. The ideal fracturing technology should have the following characteristics: first, it can achieve precise positioning during the fracturing process to ensure that the position of each sleeve in the well can be accurately controlled and identified; second, the technology should have the advantage of unlimited number of fracturing stages, solving the operational complexity and risks brought about by the gradual reduction in steel ball size differences in traditional sleeve technology; in addition, the new fracturing tool should have the characteristics of low cost, easy operation, strong adaptability, etc., and be able to cope with the increasingly complex needs of unconventional oil and gas extraction. Summary of the invention

[0003] In view of the above technical defects, the present invention provides an infinite intelligent control fracturing sleeve, which can not only achieve infinite levels, but also accurately locate the place where fracturing is required through its own detection system to achieve precise fracturing.

[0004] The technical solution of the present invention is: an infinite intelligent control fracturing sleeve dart part, including an outer shell, a lower baffle, an upper baffle, bolts, springs, a retaining ring, a blocking ball, a thrust block, a thrust bearing, a diverter block, a motor, a diverter, a capacitive sensor, a silicone rubber seal, a control module, and a diverter end cover.

[0005] The Infinitus intelligent control fracturing sleeve dart part detects the casing piston position of the downhole sleeve through a capacitive sensor, and when the specified fracturing position is reached, the control module drives the motor to convert the flow channel, and the fracturing operation is realized by the pressure holding of the plugging ball and the thrust block. The main features of the Infinitus intelligent control fracturing sleeve When it is not activated, the drilling fluid flows out from the middle, the thrust block is retracted inward under the action of the spring, and the dart part can pass through any casing; when activated, the drilling fluid flows through the plugging ball flow channel and generates pressure holding, which pushes the plugging ball and the thrust block, so that the sleeve piston on the outer sleeve shears off the pin, and then opens the oil inlet hole on the outer sleeve, thereby realizing downhole fracturing. In addition, after the fracturing is completed, the control module drives the motor to return to the inactivated state, and the Infinitus intelligent control fracturing sleeve dart part can continue to pass through the downhole sleeve position without affecting the subsequent fracturing operation.

[0006] The beneficial effects of the present invention are as follows: (1) It can well solve the maximum number of fracturing stages that can be supported by traditional sleeve technology and realize stepless fracturing. (2) After fracturing, it can be restored to an inactive state, and the Infinitus intelligently controlled fracturing sleeve dart part can continue to pass through any sleeve position underground, ensuring the borehole flow performance, reducing the resistance of underground operations, and not affecting subsequent fracturing operations. (3) The Infinitus intelligently controlled fracturing sleeve ensures that it reaches the pre-fracturing position through the simultaneous triggering of three capacitive sensors to achieve precise fracturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Attached Figure 1 It is a structural diagram of the dart part of the Infinitus intelligent control fracturing sliding sleeve of the present invention; Attached Figure 2 It is a cross-sectional view of the dart part CC of the Infinitus intelligent control fracturing sliding sleeve of the present invention; Attached Figure 3 It is a schematic diagram of the structure of the Infinitus intelligent control fracturing sleeve diverter of the present invention; Attached Figure 4 It is a structural schematic diagram for supplementing the outer sleeve sliding sleeve; Attached Figure 5 It is a flow chart of the working principle of the Infinitus intelligent control fracturing sleeve of the present invention.

[0008] The names of the parts corresponding to the marked levels in the accompanying drawings are: 1-outer shell, 2-lower baffle, 3-upper baffle, 4-bolt, 5-spring, 6-clamp ring, 7-blocking ball, 8-thrust block, 9-thrust bearing, 10-diverter block, 11-motor, 12-diverter, 13-capacitive sensor, 14-silicon rubber seal, 15-control module, 16-diverter end cover, 17-sleeve upper joint, 18-sleeve pin, 19-sleeve piston, 20 sleeve lower joint. DETAILED DESCRIPTION

[0009] In order to better describe the relative position relationship of each component in the present invention, reference is made to the attached Figure 1 All the above and below position relationships mentioned are based on the attached Figure 1 The directions shown are determined and described to ensure the accuracy of the locations of the components and the consistency of the description.

[0010] The present invention is further described below in conjunction with the accompanying drawings: See attached Figure 1 An Infinitus intelligent control fracturing sleeve dart part includes an outer shell 1, a lower baffle 2, an upper baffle 3, a bolt 4, a spring 5, a retaining ring 6, a blocking ball 7, a thrust block 8, a thrust bearing 9, a diverter block 10, a motor 11, a diverter 12, a capacitive sensor 13, a silicone rubber seal 14, a control module 15, and a diverter end cover 16.

[0011] See attached Figure 4 , supplementary explanation is required for the outer casing sliding sleeve at the fracturing location, and the outer casing sliding sleeve includes a sliding sleeve upper joint 17, a sliding sleeve pin 18, a sliding sleeve piston 19, and a sliding sleeve lower joint 20.

[0012] The outer casing sliding sleeve is lowered into the well along with the casing. There is an outer casing sliding sleeve at intervals in the casing downhole. The downhole position is calculated by detecting the number of outer casing sliding sleeve pistons that pass through, thereby achieving precise positioning of stepless fracturing.

[0013] The working principle of the Infinitus intelligent control fracturing sleeve is as follows: when the dart part of the Infinitus intelligent control fracturing sleeve passes through the outer sleeve piston 19, the three capacitive sensors 13 on the dart part of the Infinitus intelligent control fracturing sleeve will detect the outer sleeve piston 19, and the three capacitive sensors 13 will be triggered at the same time. The control module 15 calculates the fracturing position at the next moment in the well. If the specified position is reached, the control module 15 controls the motor 11 to rotate, and the motor 11 drives the shunt block 10 to convert the flow channel. When it is not activated, the shunt block 10 opens the attached Figure 1The left flow channel shown in the figure has three flow channel through holes on the diverter block 10, corresponding to the three flow channels on the outer shell 1 flowing to the middle. The drilling fluid flows out from the middle and will not produce a pressure holding effect. The dart part of the Infinitus intelligent fracturing sleeve can pass through any outer sleeve; when activated, the diverter block 10 opens the attached Figure 1 The right flow channel shown in the figure is the activated state. The drilling fluid will not flow out from the middle flow channel. The drilling fluid flows to the right flow channel, impacting the plugging ball 7 to form a pressure, and the plugging ball 7 pushes the thrust block 8 to move outward. At the same time, because the drilling fluid cannot flow out normally, the pressure generated will generate a huge downward force to make the entire Infinitus intelligent control fracturing sleeve dart part move downward. Under the action of the drilling fluid, the extended part of the thrust block 8 will drive the sleeve piston 19 of the outer sleeve sleeve to cut the sleeve pin 18, thereby opening the oil inlet hole of the outer sleeve sleeve and realizing the fracturing effect. After the fracturing is completed, that is, after the Infinitus intelligent control fracturing sleeve dart part opens the oil inlet hole on the outer sleeve sleeve, the control module 15 drives the motor to convert the flow channel back to the unactivated state. Under the action of the spring 5, the thrust block 8 is retracted inward, and the Infinitus intelligent control fracturing sleeve dart part can continue to pass through the downhole casing and the outer sleeve sleeve, and will not hinder the subsequent fracturing operation.

[0014] The above contents are only examples and descriptions of the structure of the present invention. Those skilled in the art may make various modifications, supplements, or replace the specific embodiments in a similar manner. As long as they do not deviate from the core structure of the present invention or exceed the scope defined by the patent claim, all these modifications and alternatives shall be included in the protection scope of the present invention.

Claims

1. Infinitus intelligent control fracturing sleeve, characterized by: The Infinitus intelligent control fracturing sleeve dart part is composed of an outer shell (1), a lower baffle (2), an upper baffle (3), bolts (4), a spring (5), a retaining ring (6), a plugging ball (7), a thrust block (8), a thrust bearing (9), a diverter block (10), a motor (11), a diverter (12), a capacitive sensor (13), a silicone rubber seal (14), a control module (15), and a diverter end cover (16); wherein the key to realizing the Infinitus intelligent control fracturing sleeve technology lies in the pressure holding part, which is mainly composed of a lower baffle (2), an upper baffle (3), bolts (4), a spring (5), a retaining ring (6), a plugging ball (7), and a thrust block (8); the Infinitus intelligent control fracturing sleeve pressure holding part is composed of a retaining ring (6), a lower baffle (2), an upper baffle (3), bolts (4), a spring (5), a retaining ring (6), a plugging ball (7), and a thrust block (8); The baffle plate (2) and the thrust block (8) cooperate with each other and are fixed to the upper baffle plate (3) by bolts (4), wherein a spring (5) is placed between the upper baffle plate (3) and the lower baffle plate (2); the Infinitus intelligent control fracturing sleeve mode conversion part mainly consists of a motor (11), a diverter (12), a capacitive sensor (13), and a control module (15), wherein the control module includes some control components such as a control motor power supply and a control board; the motor (11), the capacitive sensor (13), and the control module (15) are installed in the diverter (12) and sealed and fixed by a diverter end cover (16); finally, the Infinitus intelligent control fracturing sleeve mode conversion part is installed in a groove corresponding to the outer shell (1) to limit the circumferential rotation and axial positioning of the mode conversion part.

2. The Infinitus intelligent control fracturing sleeve according to claim 1 is characterized in that: The pressure-holding part has six blocking balls (7), six retaining rings (6), three on the upper and three on the lower, distributed at 120° in the circumferential direction, and six through holes are opened on the corresponding lower baffle plate (2), six springs (5), six upper baffle plates (3), six bolts (5), and three thrust blocks (3).

3. The Infinitus intelligent control fracturing sleeve according to claim 1 is characterized in that: The outer shell (1) corresponding to the Infinitus intelligent control fracturing sleeve mode conversion part is provided with three grooves evenly spaced in the circumferential direction, the grooves extending from the top of the outer shell (1) to the first step of the inner hole of the outer shell (1); the outer shell (1) is also provided with three through holes located at corresponding capacitive sensors (13) for placing silicone rubber seals (14).

4. The Infinitus intelligent control fracturing sleeve according to claim 1 is characterized in that: The diverter block (10) is provided with three evenly distributed flow channel through holes, and the corresponding outer shell (1) is provided with six flow channel holes.

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