Oil pump with improved structure

Abstract

The utility model discloses an oil pump with an improved structure, which comprises an oil pump, an outer main body oil pipe is arranged on the outer side of the oil pump, a bottom filter screen is arranged at the bottom of the oil pump, the oil pump comprises an oil pump main body and a connecting pipe, a liquid suction column is arranged in the connecting pipe, one end of the liquid suction column is fixedly communicated with a water inlet guide valve, and a water inlet of the water inlet guide valve is communicated with a throat pipe. According to the oil pump with the improved structure, the spray pipe, the throat pipe, the suction chamber and the mixing chamber are arranged in the oil pump main body and the water inlet pipe joint, moving parts are not needed, and a shaft seal is not needed, so that the oil pump is convenient to repair and maintain, and the operation cost is reduced; the jet pump is large in suction displacement, the original dynamic balance is not damaged in the suction process, the later discharge production capacity is not affected, the suction capacity and the ground injection pressure have a direct relation, circulating cleaning and production discharge production can be achieved in the horizontal section, the problems of sand and pulverized coal clogging in the horizontal section can be well solved, and the coal bed gas production capacity is improved.

Description

Technical Field

[0001] The utility model relates to the field of oil pumps, in particular to an oil pump with an improved structure. Background Art

[0002] With the widespread exploitation of clean energy coalbed methane (CBM), pulverized coal (PF) has become increasingly prominent in the middle and late stages of horizontal CBM well production. Existing production and drainage equipment is unable to address the problems of excessive PF and severe blockage in CBM wells, leading to gas flow decline, lowered fluid levels, insufficient formation fluid supply, and severe sand expulsion. Jet pumps offer negative pressure extraction, which, to some extent, compensates for the shallow water level. They also offer strong fluid permeability and maintain the original dynamic balance. Their operating principle is that high-pressure liquid injected from the surface through a nozzle creates a "negative pressure" zone at the front of the wellbore, which draws fluid. Once the fluid enters the mixing zone in the wellbore, it is lifted to the surface. However, existing technology cannot prevent problems such as PF blockage, pump sticking, short pump inspection cycles, and gas flow decline in CBM wells. Utility Model Content

[0003] The purpose of the utility model is to provide an oil pump with an improved structure to solve the problems of coalbed methane well coal powder clogging, pump sticking, short pump inspection cycle, gas volume attenuation and the like proposed in the above background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an oil pump with an improved structure, comprising an oil pump, an outer main body oil pipe is provided on the outside of the oil pump, a bottom filter is provided at the bottom of the oil pump, the oil pump comprises an oil pump body and a connecting pipe, a liquid suction column is provided inside the connecting pipe, one end of the liquid suction column is fixedly connected to a water inlet guide valve, the water inlet of the water inlet guide valve is connected to a throat pipe, one end of the throat pipe is connected to a nozzle, the nozzle extends into the oil pump body, one end of the oil pump body is connected to a diverter valve, the water inlet of the diverter valve is connected to a water inlet pipe joint, the outer side of one end of the connecting pipe is connected to the outer main body oil pipe, the other end of the connecting pipe is connected to the bottom filter, and a one-way valve lower component connected to the liquid suction column is installed on the inner side of the connection between the connecting pipe and the bottom filter.

[0005] Preferably, the oil pump is located inside the outer main body oil pipe, and an oil return cavity is provided between the oil pump and the inner wall of the outer main body oil pipe.

[0006] Preferably, a sealing ring is provided at the connection between the liquid-absorbing column and the connecting pipe.

[0007] Preferably, the one-way valve lower assembly includes a one-way valve plate, a valve body and a valve column. The valve body is installed on the connecting pipe, the one-way valve plate is installed at one end of the valve body, and the one-way valve plate is arranged corresponding to the liquid suction column. The valve column is installed at the other end of the valve body, and one end of the valve column passes through the valve body and is connected to the one-way valve plate.

[0008] Preferably, the water outlet of the water inlet guide valve is provided with a one-way valve spring pressure plate, one end of the one-way valve spring pressure plate is provided with a one-way valve spring, one end of the one-way valve spring is connected to a one-way valve ball, and the one-way valve ball is arranged corresponding to the liquid suction column.

[0009] Preferably, a filter is provided between the diverter valve and the water inlet pipe joint.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] The inside of the oil pump body and the inside of the water inlet pipe joint are equipped with nozzles and throats. Different from traditional pumps and existing traditional jet pumps, they are equipped with suction chambers and mixing chambers for diffusion, no moving parts, and no shaft seals. Therefore, they are more convenient in terms of repair and maintenance, which reduces the operating cost. The construction is simple and there is no need to test high pressure. The pump can smoothly pass through the inflection point and enter the horizontal section where it is blocked for circulation cleaning or direct production and drainage. It has a good carrying effect on coal powder and tiny particles, is not afraid of pump jamming, does not suffer from partial wear, has a long pump inspection cycle, is simple to maintain, and has good stability, which greatly improves the pump inspection and well repair cycle and production efficiency.

[0012] The jet pump has a large suction and displacement capacity, and does not destroy the original dynamic balance during the suction process. The later drainage production capacity is not affected. The suction capacity is directly related to the ground injection pressure. It can be used for cyclic cleaning and production drainage in the horizontal section, which can effectively solve the problem of sand and coal powder blockage in the horizontal section and increase coalbed methane production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 This is a cross-sectional structural diagram of the utility model;

[0015] Figure 3 This is a cross-sectional structural diagram of the oil pump body of the utility model;

[0016] Figure 4 This is a top view of the water inlet pipe joint of the utility model;

[0017] Figure 5 This is a structural diagram of the one-way valve assembly of the utility model.

[0018] In the figure: 1. Oil pump; 2. Outer main body oil pipe; 3. Bottom filter; 4. Oil pump body; 5. Water inlet pipe joint; 6. Connecting pipe; 7. Suction column; 8. One-way valve lower assembly; 9. Water inlet guide valve; 10. Throat pipe; 11. Nozzle; 12. Diverter valve; 13. Filter; 14. Oil return chamber; 15. One-way valve spring; 16. One-way valve ball; 17. One-way valve spring pressure plate; 18. Sealing ring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-5 The utility model provides an oil pump with an improved structure, including an oil pump 1, an outer main body oil pipe 2 is provided on the outside of the oil pump 1, a bottom filter 3 is provided at the bottom of the oil pump 1, the oil pump 1 includes an oil pump body 4 and a connecting pipe 6, a liquid suction column 7 is provided inside the connecting pipe 6, one end of the liquid suction column 7 is fixedly connected to a water inlet guide valve 9, the water inlet of the water inlet guide valve 9 is connected to a throat pipe 10, one end of the throat pipe 10 is connected to a nozzle 11, the nozzle 11 extends into the oil pump body 4, one end of the oil pump body 4 is connected to a diverter valve 12, the water inlet of the diverter valve 12 is connected to a water inlet pipe joint 5, the outer side of one end of the connecting pipe 6 is connected to the outer main body oil pipe 2, the other end of the connecting pipe 6 is connected to the bottom filter 3, and the connecting pipe 6 is connected to the bottom filter 3 A one-way valve lower assembly 8 connected to the liquid suction column 7 is installed on the inner side of the connection. The water inlet pipe joint 5 is connected to the water inlet pipe, and the water flow is diverted to the water inlet through the diverter valve 12 to reduce water pressure loss. There are 4 water channels in the oil pump body 4, 2 water inlets and 2 water outlets. The water enters the nozzle 11 through the oil pump body 4, and the water entering through the nozzle 11 and the liquid sucked from the water outlet are discharged from here to the oil return chamber 14, and then enter the throat pipe 10. A negative pressure is formed between the nozzle 11 and the throat pipe 10, and the water is discharged after passing through the water inlet guide valve 9 and the one-way valve. The water inlet guide valve 9 diverts the water coming in from the two water channels to 180° through a U-shaped shape, while minimizing pressure loss, thereby playing the role of high-pressure water throttling injection.

[0021] The oil pump 1 is located inside the outer main body oil pipe 2, and an oil return chamber 14 is provided between the oil pump 1 and the inner wall of the outer main body oil pipe 2. The liquid entering through the nozzle 11 and sucked from the water outlet is discharged into the oil return chamber 14.

[0022] A sealing ring 18 is provided at the connection between the liquid-absorbing column 7 and the connecting pipe 6 to play a sealing role.

[0023] The one-way valve lower component 8 includes a one-way valve plate, a valve body and a valve column. The valve body is installed on the connecting pipe 6. The one-way valve plate is installed at one end of the valve body, and the one-way valve plate is corresponding to the liquid suction column 7. The valve column is installed at the other end of the valve body, and one end of the valve column passes through the valve body and is connected to the one-way valve plate. The water outlet of the water inlet guide valve 9 is provided with a one-way valve spring pressure plate 17, and one end of the one-way valve spring pressure plate 17 is provided with a one-way valve spring 15. One end of the one-way valve spring 15 is connected to a one-way valve ball 16, and the one-way valve ball 16 is corresponding to the liquid suction column 7. The liquid suction column 7 and the one-way valve spring pressure plate 17, the one-way valve spring 15, the one-way valve ball 16, the one-way valve plate, the valve body and the valve column constitute a one-way valve unit.

[0024] A filter screen 13 is provided between the diverter valve 12 and the water inlet pipe joint 5 to filter impurities in the water.

[0025] In this embodiment, the upper end of the oil pump body 4 is connected to the water inlet pipe joint 5, and the outer main body oil pipe 2 is installed. The high-pressure power fluid forms a negative pressure area through the nozzle 11. The power fluid in the negative pressure area is mixed with the downhole liquid and then enters the main throat pipe 10. The end face of the oil pump body 4 is provided with four flow channels, which are divided into two groups in opposite directions, one group is the power fluid flow channel, and the other group is the well fluid suction flow channel. When the high-pressure power liquid injected from the ground passes through the central oil pumping pipe to the nozzle 11 and the power fluid water inlet flow channel, a high-speed low-pressure fluid jet is formed at the nozzle 11, and a negative pressure is formed between the nozzle 11 and the throat pipe 10. The downhole liquid is sucked into the negative pressure area through another group of flow channels and enters the throat pipe 10 for mixing and diffusion, and then enters the annulus through the water outlet and is lifted to the ground.

[0026] When in use, the utility model is an oil pump with an improved structure, which is provided with an oil pump body 4. During use, a ground injection pressure pump is used to inject high-pressure liquid into the interior of the oil pump 1, specifically, the high-pressure liquid is transmitted to the water inlet pipe joint 5 of the oil pump 1 through a hollow oil pumping pipe, and a high-speed low-pressure liquid jet is generated under the throttling action of the nozzle 11, and a low-pressure negative pressure area is generated between the nozzle 11 and the throat pipe 10, which sucks the liquid in the well into the pump, and after mixing at the throat pipe 10, it enters the interior of the outer main body oil pipe 2 through the water outlet flow channel provided on the outer main body oil pipe 2 and the oil pump body 4, and is lifted to the ground after passing through the annular space of the return oil chamber 14 between the oil pump body 4 and the outer main body oil pipe 2, and enters the ground sedimentation water tank, and the coal powder is settled at the bottom of the water tank through the sedimentation tank, and is regularly discharged into the sewage pool, and the sedimentation filtered water A part of it is injected into the well through the injection pump to provide power fluid, and the excess water is discharged into the water reservoir to complete the entire oil pumping work. The entire jet pump adopts a multi-layer setting. The inside of the oil pump body 4 and the inside of the water inlet pipe joint 5 are provided with a nozzle 11 and a throat 10. It is different from traditional pumps and existing traditional jet pumps. It has multi-stage jet injection to form multi-stage nozzles, suction chambers, and mixing chamber diffusion. It has no moving parts and does not require shaft seals. Therefore, it is more convenient in repair and maintenance, reduces operating costs, is simple to construct, does not require high pressure testing, can smoothly pass through the turning point, enter the horizontal section where it is blocked for circulation cleaning or direct production and drainage, has a good carrying effect on coal powder and tiny particles, is not afraid of pump jamming, does not wear eccentrically, has a long pump inspection cycle, is simple to maintain, and has good stability, which greatly improves the pump inspection and well repair cycle and production efficiency.

[0027] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An oil pump with an improved structure, comprising an oil pump (1), characterized in that: An outer main body oil pipe (2) is provided on the outside of the oil pump (1), a bottom filter (3) is provided on the bottom of the oil pump (1), the oil pump (1) comprises an oil pump body (4) and a connecting pipe (6), a liquid suction column (7) is provided inside the connecting pipe (6), one end of the liquid suction column (7) is fixedly connected to a water inlet guide valve (9), the water inlet of the water inlet guide valve (9) is connected to a throat pipe (10), one end of the throat pipe (10) is connected to a nozzle (11), the nozzle The pipe (11) extends into the oil pump body (4), one end of the oil pump body (4) is connected to a diverter valve (12), the water inlet of the diverter valve (12) is connected to a water inlet pipe joint (5), the outer side of one end of the connecting pipe (6) is connected to the outer body oil pipe (2), the other end of the connecting pipe (6) is connected to the bottom filter (3), and the inner side of the connection between the connecting pipe (6) and the bottom filter (3) is installed with a one-way valve lower component (8) connected to the liquid suction column (7).

2. An oil pump with an improved structure according to claim 1, characterized in that: The oil pump (1) is located inside the outer main body oil pipe (2), and an oil return cavity (14) is provided between the oil pump (1) and the inner wall of the outer main body oil pipe (2).

3. The oil pump with an improved structure according to claim 1, characterized in that: A sealing ring (18) is provided at the connection between the liquid-absorbing column (7) and the connecting pipe (6).

4. The oil pump with an improved structure according to claim 1, characterized in that: The one-way valve lower assembly (8) includes a one-way valve plate, a valve body and a valve column. The valve body is mounted on the connecting pipe (6). The one-way valve plate is mounted on one end of the valve body, and the one-way valve plate and the liquid suction column (7) are correspondingly arranged. The valve column is mounted on the other end of the valve body, and one end of the valve column passes through the valve body and is connected to the one-way valve plate.

5. The oil pump with an improved structure according to claim 1, characterized in that: A one-way valve spring pressure plate (17) is provided at the water outlet of the water inlet guide valve (9), one end of the one-way valve spring pressure plate (17) is provided with a one-way valve spring (15), one end of the one-way valve spring (15) is connected to a one-way valve ball (16), and the one-way valve ball (16) is provided corresponding to the liquid suction column (7).

6. The oil pump with an improved structure according to claim 1, characterized in that: A filter screen (13) is provided between the diverter valve (12) and the water inlet pipe joint (5).

Images