Pressure opening and fixing valve ball device

Abstract

The utility model provides a pressure opening fixed valve ball device, which belongs to a device in an oil and gas exploitation process and is characterized in that a fishing head is mounted at the upper part of a fixed valve body, a valve seat is arranged at the lower part of the fishing head, a conical head at the upper part of a valve core is positioned on the inner side below the valve seat, and the lower part of the valve core is positioned in a guide seat in the fixed valve body; a spring is arranged outside the valve core and is positioned in an inner cavity on the fixed valve body above the guide seat; and a sealing ring is arranged between the valve seat and the fixed valve body. The device is simple in structure, convenient and fast to operate, applicable to most well conditions, free of salvage and workover operation, capable of continuing production after dredging is completed, easy to implement, free of salvage operation and workover operation of a standing valve, capable of improving the discharging and mining time rate of a lifting tool and capable of reducing production cost.

Description

Technical Field

[0001] The utility model relates to a device in the process of oil and gas exploitation, in particular to a fixed valve ball device on a hydraulic jet pump, a hydraulic piston pump or an oil pump. Background Art

[0002] At present, in the process of oil and gas production in oil fields, fixed valves are installed at the bottom of common lifting tools such as hydraulic jet pumps, hydraulic piston pumps, and oil pumps. During the lifting process, the fixed valve is in the open state, and in the non-lifting state, the fixed valve is in the closed state. In the well conditions where the formation produces sand or coal powder, it is easy to cause the formation fluid to enter the lifting tool channel unsmoothly or blocked, causing the lifting tool to fail to work normally. There are three common solutions in this case: First, salvage the fixed valve, flush the formation fluid into the lifting tool channel, complete the dredging, and resume production. Second, the liquid enters from the tubing and casing annulus, and flushes the formation fluid into the lifting tool channel from the outside to the inside of the lifting tool to complete the dredging. This method is suitable for well conditions with sufficient formation energy, but not for well conditions with insufficient formation energy and horizontal well conditions. Third, in the well repair operation, the downhole tool is pulled out to flush sand, salvage sand, and salvage coal powder, and the lifting tool and pipe string are re-entered after completion. The above three methods all have limitations and can only be applied to some well conditions. The third method takes a long time to implement and is expensive. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a pressure-opened fixed valve ball device, which can clear the channel of the formation fluid into the lifting tool without salvaging the fixed valve or pipe column operation, so as to reduce the production cost.

[0004] The utility model is implemented as follows: a pressure-opened fixed valve ball device comprises a fishing head, which is mounted on the upper part of a fixed valve body, the lower part of the fishing head is a valve seat, the conical head on the upper part of the valve core is located on the inner side below the valve seat, the lower part of the valve core is located in a guide seat in the fixed valve body, a spring is arranged outside the valve core in an inner cavity on the fixed valve body above the guide seat, a first transverse channel on the upper part of the fixed valve body communicates with a second longitudinal channel on the valve seat, a fourth longitudinal channel on the lower part of the fixed valve body communicates with a third longitudinal channel on the guide seat, the third channel communicates with the inner cavity on the fixed valve body, and a sealing ring is arranged between the valve seat and the fixed valve body.

[0005] The device of the utility model has a simple structure and is easy to operate. It can be applied to most well conditions without salvaging and well repairing operations. It can complete the flushing and dredging of the formation fluid into the lifting tool channel. After the dredging is completed, production can be continued. It is easy to implement, avoids fixed valve salvaging operations and well repairing operations, improves the lifting tool drainage time rate, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of an existing fixed valve ball after being installed with a downhole pipe string and equipment.

[0007] Figure 2 It is a schematic diagram of the pressure-opened fixed valve ball structure of the utility model.

[0008] Figure 3 It is a schematic diagram of the production state of the pressure-opened fixed valve ball of the utility model.

[0009] Figure 4 It is a schematic diagram of the state of the pressure-opened fixed valve ball flushing the formation fluid into the lifting tool channel of the utility model.

[0010] In the figure: casing 1, large oil pipe 2, small oil pipe 3, production pump core 4, working cylinder 5, nozzle 6, throat 7, existing fixed valve ball 8, fixed valve ball seat 9, formation fluid inlet pump channel 10, plug 11, first mixed liquid channel 12, power fluid channel 13, second mixed liquid channel 14, relatively low pressure area 15, formation fluid channel 16, formation fluid inlet pump channel 17, pressure-opened fixed valve ball device 18, first channel 18.1, second channel 18.2, third channel 18.3, fourth channel 18.4, valve seat 18.5, sealing ring 18.6, valve core 18.7, spring 18.8, guide seat 18.9, fixed valve body 18.10, fishing head 18.11. DETAILED DESCRIPTION

[0011] The preferred embodiment of the present invention is described below by taking a hydraulic jet pump lifting tool as an example and in conjunction with the accompanying drawings. It should be understood that the preferred embodiment described herein is only used to illustrate and understand the present invention, and is not used to limit the present invention.

[0012] As shown in the accompanying drawings, a pressure-opened fixed valve ball device of the utility model has a fishing head 18.11, which is installed on the upper part of the fixed valve body 18.10, and the lower part of the fishing head is a valve seat 18.5. The conical head of the upper part of the valve core 18.7 is located on the inner side below the valve seat, and the lower part of the valve core is located in the guide seat 18.9 in the fixed valve body. A spring 18.8 is arranged outside the valve core and is located in the inner cavity of the fixed valve body above the guide seat. The first transverse channel 18.1 on the upper part of the fixed valve body communicates with the second longitudinal channel 18.2 on the valve seat, and the fourth longitudinal channel 18.4 on the lower part of the fixed valve body communicates with the third longitudinal channel 18.3 on the guide seat. The third channel communicates with the inner cavity on the fixed valve body, and a sealing ring 18.6 is arranged between the valve seat 18.5 and the fixed valve body.

[0013] When in use, the device of the utility model is installed at the installation position of the existing fixed valve ball 8, and other structures are not changed. When the lifting tool is in normal production, the pressure opens the fixed valve ball device 18 to leave the fixed valve ball seat 9, opens the channel, and the formation fluid enters the lifting tool and is lifted to the ground. When the passage of formation fluid into the lifting tool is blocked or clogged, the control valves on the outlets of the annular passages of the large oil pipe 2 and the small oil pipe 3 are closed on the ground, and the pressure accumulates in the lifting tool and the pipe string. After the power fluid enters from the small oil pipe 3, it is ejected through the nozzle 6 through the formation fluid passage 16 and enters the upper part of the pressure-opened fixed valve ball device 18. The pressure-opened fixed valve ball device 18 falls back onto the fixed valve ball seat 9. As the pressure in the pump barrel of the hydraulic jet pump increases, the power fluid acts on the valve core 18.7 through the first channel 18.1 and the second channel 18.2 on the pressure-opened fixed valve ball. As the pressure acting on the valve core 18.7 increases, the elastic force of the spring 18.8 is overcome and the valve core 18.7 is pushed open. The liquid in the pump barrel of the hydraulic jet pump is discharged through the third channel 18.3 on the guide seat 18.9 and the fourth channel 18.4 on the fixed valve body 18.10, and the passage of formation fluid into the lifting tool is unblocked. After the dredging is completed, the control valves on the annular channels of the large oil pipe 2 and the small oil pipe 3 are opened, and the pressure in the pump barrel is quickly released from the mixed liquid channel, the pressure near the pressure-opening fixed valve ball device 18 is reduced, and the valve core 18.7 moves upward and closes under the action of the spring 18.8; the power fluid forms a relatively low-pressure area at the nozzle 6 and the throat 7, and the pressure-opening fixed valve ball device 18 leaves the fixed valve ball seat 9 and moves upward under the action of the pressure difference, the formation fluid enters the lifting tool channel, and the lifting tool resumes normal production.

[0014] The device can adjust the preload of the spring 18.8 according to the lifting tool and the pumping depth, and further adjust the opening pressure of the valve ball device fixing the utility model to meet the requirements of different lifting tools and well conditions.

[0015] The upper part of the valve core 18.7 is provided with a sealing surface which cooperates with the valve seat 18.5.

[0016] The arrows in the figure indicate the direction of liquid flow.

[0017] During manufacturing, the lower part of the fishing head 18.11 is provided with a connecting thread, the top of the fixed valve body is provided with an internal thread, and the fishing head and the fixed valve body are connected by threads. The center of the guide seat 18.9 is provided with a concave platform to facilitate the positioning of the spring, and the center of the guide seat is provided with a hole that slides with the lower part of the valve core to straighten and guide the valve core.

[0018] The same as the existing downhole tubing and equipment: the outside of the large oil pipe 2 is the casing 1; the working pump core 4 is installed on the top of the pressure-opened fixed valve ball device 18; the working cylinder 5 is located at the lower end of the large oil pipe; the formation fluid pump inlet channel 10 is located at the lower part of the working cylinder; the wire plug 11 is located at the lower part of the formation fluid pump inlet channel; the first mixed liquid channel 12 is between the small oil pipe and the large oil pipe; the inner cavity of the small oil pipe is the power liquid channel 13; there is a second mixed liquid channel 14 on the working cylinder 5; there is a relatively low-pressure area 15 near the nozzle and throat; there is a formation fluid channel 16 on the inside of the working cylinder; and there is a formation fluid pump inlet channel 17 in the middle of the fixed valve ball seat.

[0019] The above-mentioned embodiments are only preferred specific implementations of the present invention applied to a hydraulic jet pump, a lifting tool. Similarly, the present invention can also be used for lifting tools such as hydraulic piston pumps and oil pumps to achieve the function of flushing and unblocking the blocked passages of the formation fluid entering the lifting tool such as hydraulic piston pumps and oil pumps. The usual changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure-opened fixed valve ball device, characterized in that: The utility model comprises a fishing head (18.11) which is mounted on the upper part of a fixed valve body (18.10). The lower part of the fishing head is a valve seat (18.5). The conical head of the upper part of the valve core (18.7) is located on the inner side below the valve seat. The lower part of the valve core is located in a guide seat (18.9) in the fixed valve body. A spring (18.8) is arranged outside the valve core and is located in an inner cavity on the fixed valve body above the guide seat. A first transverse channel (18.1) on the upper part of the fixed valve body communicates with a second longitudinal channel (18.2) on the valve seat. A fourth longitudinal channel (18.4) on the lower part of the fixed valve body communicates with a third longitudinal channel (18.3) on the guide seat. The third channel communicates with the inner cavity on the fixed valve body. A sealing ring (18.6) is arranged between the valve seat (18.5) and the fixed valve body.

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