Fracturing wellhead device suitable for volume fracturing

Abstract

The fracturing wellhead device suitable for volume fracturing comprises a main pipeline, branch pipelines are fixedly connected to the two sides of the main pipeline, the main pipeline communicates with the branch pipelines, a main valve is arranged at one end of the main pipeline, the other end of the main pipeline is connected with a mounting base in an assembled mode, and branch valves are evenly distributed at the two ends of each branch pipeline; and filtering cavities are formed in the inner sides of the branch pipelines. The fracturing wellhead device suitable for volume fracturing solves the problems that an existing fracturing wellhead device is inconvenient to install, a filter screen is not installed, a single injection port is arranged, and the pressure of a high-pressure manifold is high during large-displacement injection.

Description

Technical Field

[0001] The invention relates to the technical field of oil production equipment, and in particular to a fracturing wellhead device suitable for volume fracturing. Background Art

[0002] In the field of petroleum, fracturing is a method of using hydraulic force to form cracks in oil and gas layers, also known as hydraulic fracturing. Fracturing refers to a method of using hydraulic force to form cracks in oil and gas layers during oil or gas production, also known as hydraulic fracturing; the main pipeline and flange of the existing fracturing device are usually assembled and connected with multiple bolts. Since the assembly holes of the main pipeline and the flange need to correspond one by one during assembly, there are many inconveniences in actual installation, and two people are often required to cooperate in installation; therefore, it is necessary to improve the existing technology.

[0003] The existing fracturing wellhead devices have the following main shortcomings: (1) The main pipeline and the mounting seat are usually assembled and connected with multiple bolts. Since the main pipeline and the mounting holes of the mounting seat need to correspond one by one during assembly, there are many inconveniences during actual installation. It often requires two people to work together for installation, which is inefficient and wastes financial and material resources. (2) There is no filter installed at the injection port, and larger solid particles can easily enter the well, resulting in large injection friction, high construction pressure, and increased safety hazards of overpressure at the wellhead. (3) When a single injection port is used for large-volume injection, the pressure of the high-pressure manifold is high, which poses a safety hazard. Summary of the invention

[0004] The purpose of the present invention is to provide a fracturing wellhead device suitable for volume fracturing, which solves the problems of inconvenient installation of the existing fracturing wellhead device, no filter screen installed and high pressure of the high-pressure manifold when a single injection port is injected in a large displacement.

[0005] The technical solution adopted by the present invention is: a fracturing wellhead device suitable for volume fracturing, including a main pipeline, branch pipelines are fixedly connected on both sides of the main pipeline, the main pipeline and the branch pipeline are interconnected, a main valve is arranged on one end of the main pipeline, the other end of the main pipeline is assembled and connected to a mounting seat, branch valves are arranged at both ends of the branch pipeline, and a filter chamber is arranged on the inner side of the branch pipeline.

[0006] The present invention is also characterized in that:

[0007] The mounting seat and the main pipe are both provided with a plurality of mutually matching assembly holes, in which assembly bolts are installed, a through groove matching the main pipe is provided at the center of the mounting seat, a positioning seat is fixedly connected to the connecting end of the mounting seat, the positioning seat is in a circular ring shape, and a non-through annular groove is arranged on the end surface of the main pipe, and the groove matches the positioning seat;

[0008] A plurality of clamping structures are arranged on the periphery of the positioning seat, and the clamping structures include positioning pins. The positioning pins are connected to the positioning seat by clamping springs. The positioning pins are provided with inclined surfaces for easy installation. A plurality of non-through matching holes are arranged inside the grooves, and the matching holes are installed in coordination with the positioning pins.

[0009] A filter screen is movably installed in the filter cavity.

[0010] Guide rods are installed on both sides of the filter chamber, and both sides of the filter screen extend to the inner side of the filter chamber and are slidably installed with the guide rods. A driving motor is fixed to the upper end of the branch pipe, and a transmission rod is eccentrically installed on the executive wheel of the driving motor. The end of the transmission rod away from the driving motor is rotatably connected to a telescopic rod, which extends into the filter chamber and is connected to one end of the filter screen.

[0011] A shock absorbing spring is arranged on the periphery of the guide rod, the shock absorbing spring is connected with the filter screen, and the shock absorbing spring is located at a side of the filter screen away from the telescopic rod.

[0012] The driving motor is a servo motor.

[0013] The main valve and sub-valve are wrapped with a protective layer of sponge material.

[0014] The beneficial effects of the present invention are:

[0015] The fracturing wellhead device suitable for volume fracturing provided by the present invention is provided with a positioning seat and a groove that cooperate with each other between the mounting seat and the main pipeline, and a positioning pin and a matching hole are provided between the groove and the positioning seat, so that the auxiliary main pipeline and the assembly holes of the mounting seat correspond one to one, which is convenient for subsequent installation; by arranging branch pipelines on both sides of the main pipeline, it is convenient to use two pressure pumps to simultaneously inject fracturing fluid into the well, thereby achieving high-pressure and high-flow injection, thereby improving the hydraulic efficiency of the fracturing wellhead device; in addition, by movably installing a filter screen in the branch pipeline, it is convenient to drive the filter screen to move back and forth, avoid impurities from gathering at the filter screen, and ensure the working effect of the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of a fracturing wellhead device applicable to volume fracturing of the present invention;

[0017] Figure 2 It is a schematic diagram of the connection structure between the mounting seat and the main pipeline in the fracturing wellhead device suitable for volume fracturing of the present invention;

[0018] Figure 3 It is a schematic diagram of the arrangement of positioning pins on a mounting seat in a fracturing wellhead device suitable for volume fracturing of the present invention;

[0019] Figure 4 for Figure 1 Enlarged view of point A in the middle;

[0020] Figure 5 for Figure 3 Enlarged view of point B in the middle.

[0021] In the figure: 1. main pipeline, 2. branch pipeline, 3. main valve, 4. branch valve, 5. mounting seat, 6. assembly bolts, 7. filter chamber, 8. filter screen, 9. guide rod, 10. shock-absorbing spring, 11. assembly hole, 12. through groove, 13. groove, 14. positioning seat, 15. positioning pin, 16. clamping spring, 17. drive motor, 18. transmission rod, 19. telescopic rod. DETAILED DESCRIPTION

[0022] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] The present invention is applicable to a fracturing wellhead device suitable for volume fracturing, such as Figure 1 As shown, it includes a main pipeline 1, branch pipelines 2 are fixedly connected to both sides of the main pipeline 1, the main pipeline 1 and the branch pipeline 2 are connected to each other, a main valve 3 is arranged on the main pipeline 1, the main pipeline 1 is assembled and connected with a mounting seat 5, a branch valve 4 is arranged on the branch pipeline 2, and a filter chamber 7 is arranged inside the branch pipeline 2;

[0024] like Figure 2 As shown, a plurality of mutually matching assembly holes 11 are provided on the mounting seat 5 and the main pipe 1, and assembly bolts 6 are installed in the assembly holes 11. A through groove 12 matching the main pipe 1 is provided at the center of the mounting seat 5; a positioning seat 14 is fixedly connected to the connecting end of the mounting seat 5, and the positioning seat 14 is in a circular ring shape. A non-through groove 13 is arranged on the main pipe 1, and the groove 13 matches the positioning seat 14;

[0025] like Figure 3 As shown, the periphery of the positioning seat 14 is provided with a plurality of clamping structures, the clamping structures include a positioning pin 15, the positioning pin 15 is connected to the positioning seat 14 by a clamping spring 16, the positioning pin 15 is provided with an inclined surface for easy installation, and the interior of the groove 13 is provided with a plurality of non-through matching holes, which are installed in cooperation with the positioning pin 15; Figure 5 As shown, the positioning seat 14 is embedded in the groove 13, and the mounting seat 5 is rotated so that the positioning pin 15 enters the matching hole under the action of the clamping spring 16. At this time, the assembly holes 11 between the mounting seat 5 and the main pipeline 1 correspond one to one, which is convenient for fixing with assembly bolts 6. A filter screen 8 is movably installed in the filter chamber 7 to filter out impurities in the fracturing fluid of the branch pipeline 2.

[0026] like Figure 4As shown, guide rods 9 are installed on both sides of the inside of the filter chamber 7, and both sides of the filter screen 8 extend to the inner side of the filter chamber 7 and are slidably installed with the guide rods 9. A drive motor 17 is fixed to the upper end of the branch pipe 2, and a transmission rod 18 is eccentrically installed on the execution wheel of the drive motor 17. The end of the transmission rod 18 away from the drive motor 17 is rotatably connected to a telescopic rod 19, and the telescopic rod 19 extends into the filter chamber 7 and is connected to one end of the filter screen 8.

[0027] A shock absorbing spring 10 is mounted on the periphery of the guide rod 9 . The shock absorbing spring 10 is connected to the filter screen 8 . The shock absorbing spring 10 is located on a side of the filter screen 8 away from the telescopic rod 19 .

[0028] The specific type of the driving motor 17 is not limited. Preferably, the driving motor 17 is a servo motor.

[0029] The periphery of the main valve 3 and the sub-valve 4 is wrapped with a protective layer of sponge material.

[0030] Example 1

[0031] The present invention is suitable for a fracturing wellhead device for volume fracturing, comprising a main pipeline 1, with branch pipelines 2 fixedly connected to both sides of the main pipeline 1, the main pipeline 1 and the branch pipelines 2 are communicated with each other, a main valve 3 is arranged on one end of the main pipeline 1, the other end of the main pipeline 1 is assembled and connected with a mounting seat 5, and branch valves 4 are arranged on both ends of the branch pipelines 2.

[0032] The mounting seat 5 and the main pipe 1 are both provided with a plurality of mutually matching assembly holes 11, in which assembly bolts 6 are installed, a through groove 12 matching with the main pipe 1 is provided at the center of the mounting seat 5, a positioning seat 14 is fixedly connected to the connecting end of the mounting seat 5, and the positioning seat 14 is in a circular ring shape, and a non-through annular groove 13 is arranged on the end surface of the main pipe 1, and the groove 13 matches with the positioning seat 14;

[0033] A plurality of snap-fit ​​structures are arranged on the periphery of the positioning seat 14, and the snap-fit ​​structures include a positioning pin 15. The positioning pin 15 is connected to the positioning seat 14 via a snap-fit ​​spring 16. The positioning pin 15 is provided with an inclined surface for easy installation. A plurality of non-through matching holes are arranged inside the groove 13, and the matching holes are installed in cooperation with the positioning pin 15.

[0034] Example 2

[0035] The present invention is applicable to a fracturing wellhead device for volume fracturing, comprising a main pipeline 1, with branch pipelines 2 fixedly connected on both sides of the main pipeline 1, the main pipeline 1 and the branch pipelines 2 are communicated with each other, a main valve 3 is arranged on the main pipeline 1, the main pipeline 1 is assembled and connected with a mounting seat 5, and a branch valve 4 is arranged on the branch pipeline 2; a plurality of mutually matching assembly holes 11 are opened on the mounting seat 5 and the main pipeline 1, assembly bolts 6 are installed in the assembly holes 11, and a through groove 12 matching with the main pipeline 1 is opened at the center of the mounting seat 5; a positioning seat 14 is fixedly connected to the connecting end of the mounting seat 5, and the positioning seat 14 is in a circular ring shape, a non-through groove 13 is arranged on the main pipeline 1, and the groove 13 matches with the positioning seat 14; the outer periphery of the positioning seat 14 A plurality of clamping structures are arranged, and the clamping structures include a locating pin 15. The locating pin 15 is connected to the locating seat 14 by a clamping spring 16. The locating pin 15 is provided with an inclined surface for easy installation. The interior of the groove 13 is provided with a plurality of non-through matching holes, and the matching holes are installed in cooperation with the locating pin 15. The locating seat 14 is embedded in the groove 13, and the mounting seat 5 is rotated so that the locating pin 15 enters the matching hole under the action of the clamping spring 16. At this time, the assembly holes 11 between the mounting seat 5 and the main pipeline 1 correspond one by one, so that it is convenient to fix them with the assembly bolts 6. A filter chamber 7 is arranged on the inner side of the branch pipeline 2, and a filter screen 8 is movably installed in the filter chamber 7 to filter out impurities in the fracturing fluid of the branch pipeline 2.

[0036] Example 3

[0037] The present invention is applicable to a fracturing wellhead device for volume fracturing, comprising a main pipeline 1, branch pipelines 2 are fixedly connected to both sides of the main pipeline 1, the main pipeline 1 and the branch pipelines 2 are communicated with each other, a main valve 3 is arranged on the main pipeline 1, the main pipeline 1 is assembled and connected with a mounting seat 5, and a branch valve 4 is arranged on the branch pipeline 2; a plurality of mutually matching assembly holes 11 are opened on the mounting seat 5 and the main pipeline 1, assembly bolts 6 are installed in the assembly holes 11, and a through groove 12 matching the main pipeline 1 is opened at the center of the mounting seat 5; a positioning seat 14 is fixedly connected to the connecting end of the mounting seat 5, and the positioning seat 14 is in a circular ring shape, and a non-through groove 1 is arranged on the main pipeline 1 3. The groove 13 cooperates with the positioning seat 14; a plurality of snap-fit ​​structures are arranged on the periphery of the positioning seat 14, and the snap-fit ​​structures include a positioning pin 15. The positioning pin 15 is connected to the positioning seat 14 by a snap-fit ​​spring 16. The positioning pin 15 is provided with an inclined surface for easy installation. The interior of the groove 13 is provided with a plurality of non-through matching holes, and the matching holes are installed in cooperation with the positioning pin 15; the positioning seat 14 is embedded in the groove 13, and the mounting seat 5 is rotated so that the positioning pin 15 enters the matching hole under the action of the snap-fit ​​spring 16. At this time, the assembly holes 11 between the mounting seat 5 and the main pipeline 1 correspond one by one, which is convenient for fixing with the assembly bolts 6.

[0038] A filter chamber 7 is provided inside the branch pipe 2 , and a filter screen 8 is movably installed in the filter chamber 7 to filter out impurities in the fracturing fluid of the branch pipe 2 .

[0039] Guide rods 9 are installed on both sides of the filter chamber 7, and both sides of the filter screen 8 extend to the inner side of the filter chamber 7 and are slidably installed with the guide rods 9. A drive motor 17 is fixed to the upper end of the branch pipe 2, and a transmission rod 18 is eccentrically installed on the execution wheel of the drive motor 17. The end of the transmission rod 18 away from the drive motor 17 is rotatably connected to a telescopic rod 19, and the telescopic rod 19 extends into the filter chamber 7 and is connected to one end of the filter screen 8.

[0040] Example 4

[0041] In order to make the reciprocating movement of the filter screen 8 in the filter chamber 7 smoother, this embodiment is improved on the basis of embodiment 1, and the improvement is as follows: a shock-absorbing spring 10 is installed on the periphery of the guide rod 9, and the shock-absorbing spring 10 is connected to the filter screen 8, and the shock-absorbing spring 10 is located on the side of the filter screen 8 away from the telescopic rod 19.

[0042] The working principle of the fracturing wellhead device applicable to volume fracturing of the present invention is:

[0043] When the above-mentioned fracturing wellhead device is actually operated, the branch pipes 2 on both sides can be connected to the pressure pump, so that the two pressure pumps can simultaneously inject fracturing fluid into the well, achieving high-pressure and high-flow injection, thereby improving the hydraulic efficiency of the fracturing wellhead device; when assembling the mounting seat 5 and the main pipeline 1, the positioning seat 14 is embedded in the groove 13, and the mounting seat 5 is rotated so that the positioning pin 15 enters the matching hole under the action of the clamping spring 16. At this time, the assembly holes 11 between the mounting seat 5 and the main pipeline 1 correspond one to one, which is convenient for fixing with the assembly bolts 6. The filter screen 8 can filter the fracturing fluid in the branch pipe 2, and the drive motor 17 is started to operate. The drive motor 17 drives the telescopic rod 19 to move back and forth through the transmission rod 18, so that the filter screen 8 slides back and forth in the filter chamber 7 to avoid impurities from accumulating at the filter screen 8 and ensure the filtering effect of the filter screen 8.

Claims

1. A fracturing wellhead device suitable for volume fracturing, characterized in that: The invention comprises a main pipeline (1), branch pipelines (2) are fixedly connected to both sides of the main pipeline (1), the main pipeline (1) and the branch pipeline (2) are communicated with each other, a main valve (3) is arranged on one end of the main pipeline (1), the other end of the main pipeline (1) is assembled and connected to a mounting seat (5), branch valves (4) are arranged on both ends of the branch pipeline (2), and a filter chamber (7) is arranged on the inner side of the branch pipeline (2).

2. The fracturing wellhead device suitable for volume fracturing according to claim 1, characterized in that: The mounting seat (5) and the main pipe (1) are both provided with a plurality of mutually matching assembly holes (11), the assembly holes (11) are provided with assembly bolts (6), the center of the mounting seat (5) is provided with a through groove (12) matching with the main pipe (1), the connection end of the mounting seat (5) is fixedly connected with a positioning seat (14), the positioning seat (14) is in a circular ring shape, and a non-through annular groove (13) is arranged on the end surface of the main pipe (1), the groove (13) matches with the positioning seat (14); The outer periphery of the positioning seat (14) is provided with a plurality of clamping structures, the clamping structures comprising a positioning pin (15), the positioning pin (15) and the positioning seat (14) are connected via a clamping spring (16), the positioning pin (15) is provided with an inclined surface for easy installation, and the interior of the groove (13) is provided with a plurality of non-through matching holes, which are matched with the positioning pin (15) for installation.

3. The fracturing wellhead device suitable for volume fracturing according to claim 1, characterized in that: A filter screen (8) is movably installed in the filter cavity (7).

4. The fracturing wellhead device suitable for volume fracturing according to claim 3, characterized in that: Guide rods (9) are mounted on both sides of the filter chamber (7); both sides of the filter screen (8) extend to the inside of the filter chamber (7) and are slidably mounted on the guide rods (9); a drive motor (17) is fixed to the upper end of the branch pipe (2); a transmission rod (18) is eccentrically mounted on the execution wheel of the drive motor (17); one end of the transmission rod (18) facing away from the drive motor (17) is rotatably connected to a telescopic rod (19); the telescopic rod (19) extends into the filter chamber (7) and is connected to one end of the filter screen (8).

5. The fracturing wellhead device suitable for volume fracturing according to claim 4, characterized in that: A shock absorbing spring (10) is mounted on the periphery of the guide rod (9), the shock absorbing spring (10) is connected to the filter screen (8), and the shock absorbing spring (10) is located on the side of the filter screen (8) away from the telescopic rod (19).

6. The fracturing wellhead device suitable for volume fracturing according to claim 4, characterized in that: The driving motor (17) is a servo motor.

7. The fracturing wellhead device suitable for volume fracturing according to claim 1, characterized in that: The main valve (3) and the sub-valve (4) are wrapped around a protective layer made of sponge material.

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