CN201155448Y - Vail external hydraulic self-sealing plunger pump - Google Patents

Abstract

The utility model provides an external valve hydraulic self-sealing plunger oil pump, which mainly includes a swimming valve, a plunger, a pump cylinder and a fixed valve, the fixed valve is fixedly connected to the lower part of the pump cylinder, and the swimming valve is placed On the upper part of the plunger, and the fixed valve on the lower part of the pump barrel is connected to a fixed locking support plugged into a locking support seat, and the pump can be pulled out of the well through a pulling mechanism; a sub-cavity bridge joint is also provided and backwash valve to form two special channels for oil pumping and flushing, which makes the pump inspection and flushing operations more convenient and reduces the production cost. The pump has the characteristics of high pump efficiency, small pump diameter, small friction resistance, long life, convenient operation and no pollution.

Description

Vail external hydraulic self-sealing plunger pump

Technical field:

The utility model belongs to the lifting field of petroleum exploitation machinery, in particular to a plunger oil well pump of a pumping unit, which is a hydraulic plunger oil well pump with a small plunger diameter and self-sealing function.

Background technique:

At present, pumping oil with a rod plunger pump is one of the traditional lifting methods in the world petroleum industry, and it is also the dominant artificial lifting method so far. The first stage of rod pump pumping technology development is the bushing plunger pump, and the second stage is the whole barrel plunger pump, which is widely used at present. However, conventional plunger pumps have problems such as large friction, low efficiency, and complicated operations. When there are more oil and solid-containing particles, there is greater frictional resistance. As the gap becomes smaller and the polymer concentration becomes larger, the axial pressure becomes larger, generating lateral force, causing rods and tubes to bend, and shortening the effective stroke of the pump. , The pump efficiency is reduced, which eventually leads to bad effects such as partial friction and leakage of rods and tubes, and shortened pump inspection cycle. When troubleshooting, the rod string or the tubing string can only be pulled out by operation, which increases the cost of crude oil extraction.

On the other hand, in the plunger pump commonly used at present, the swimming valve (valve) is connected in the plunger through threads, and moves with the plunger in the pump barrel relative to the pump barrel, so the pump diameter is relatively large, which is not suitable for In the well conditions of small diameter and small displacement.

Utility model content:

The purpose of this utility model is to provide an external hydraulic self-sealing plunger oil well pump, which is suitable for small-diameter, small-displacement wells, and can solve the problem of conventional plunger pumps with large friction resistance, large theoretical displacement and low efficiency. , complex tasks, etc.

The utility model external hydraulic self-sealing plunger oil well pump mainly includes a swimming valve, a plunger, a pump barrel and a fixed valve, wherein: the fixed valve is fixedly connected to the lower part of the pump cylinder, and the swimming valve Placed on top of the outside of the plunger.

In the external hydraulic self-sealing plunger pump described above, the fixed valve at the bottom of the pump barrel is connected to a fixed locking support, and the fixed locking support is plugged into a locking support seat.

The upper end of the pump barrel is provided with a group of telescopic bosses, and the lower part of the plunger is provided with a groove for the telescopic bosses to extend into. The timely engagement of the two forms a lifting mechanism for pulling the pump out of the ground.

The above-mentioned valve external hydraulic self-sealing plunger oil pump, wherein an outer tube is coaxially sleeved on the floating valve, the plunger, the pump barrel, the fixed valve or the fixed locking support, and the locking support Outside the seat, and connect a sub-cavity bridging joint under the fixed valve or locking support seat, which is provided with an opening outside the outer tube and communicates with the fixed locking support, fixed valve, pump barrel, column The plug and the swimming valve form the oil suction channel.

The external hydraulic self-sealing plunger oil pump described above, wherein, a backwash valve is fixed inside the lower end of the outer pipe, the valve seat of the backwash valve is fixedly connected to the side wall of the outer pipe, and the bottom of the valve seat communicates with the through hole. The bottom of the outer tube and the top through hole of the valve seat communicate with the flushing cavity formed by the outer tube and the sub-cavity bridging joint and the cavity between the outer tube and the pump barrel to form a special channel for flushing.

The external hydraulic self-sealing plunger oil well pump described above, wherein, the pump barrel is provided with a sealing section, and the sealing section is provided with a sealing section casing capable of transmitting pressure, and an elastic telescopic sleeve is installed inside the casing, and inside the elastic telescopic casing Multiple wear-resistant sealing rings are stacked.

Adopting the above design, the utility model oil well pump puts the valve (valve) outside, which effectively reduces the pump diameter, making this new pump more suitable for tiny wells with borehole sizes ranging from Φ34.9mm to Φ50.8mm Well conditions with a small diameter and a production rate of 0.5m ³ /d to 1m ³ /d. The pump barrel of the pump and the fixed valve at the lower part of the pump barrel are plugged into the locking support seat through the fixed locking support, and through the reciprocating movement of the plunger in the pump barrel (the plunger can also be fixed as needed to make the pump barrel reciprocate) ) to realize the change of pump volume, so as to carry out suction and discharge. The sealing section of the pump cylinder, which is composed of three layers of casing, elastic sleeve and sealing ring, utilizes its hydraulic self-sealing function to ensure that the pump has no leakage in the upstroke and no friction in the downstroke. The engagement between the groove provided on the pump plunger and the telescopic boss provided on the pump barrel can pull the oil well pump out of the ground conveniently and reliably for pump inspection. There is a sub-cavity bridging joint at the bottom of the oil well pump, so that the pump forms two special channels for oil pumping and flushing. This design makes the flushing operation clean and thorough, effectively prolonging the failure period of the oil well pump and reducing the cost of oil production.

Description of drawings:

Fig. 1 is the structural diagram of the external hydraulic self-sealing plunger pump of the utility model;

Fig. 2 is a partially enlarged view of the pump barrel of the sealing section in Fig. 1;

Fig. 3 is a working schematic diagram of the utility model Ver's external hydraulic self-sealing plunger oil well pump;

In the figure: 1. Sucker rod, 2. Swimming valve (valve), 34. Plunger groove, 3. Plunger, 4. Pump barrel sealing section, 41. Sealing section shell, 42. Elastic telescopic sleeve , 43. Sealing ring, 44. Retractable boss, 5. Pump barrel, 6. Fixed valve (valve), 7. Fixed locking support, 8. Locking support seat, 9. Cavity bridge joint, 91 .Horizontal hole, 92. Vertical hole, 10. Backwash valve, 11. Outer pipe, 12. Casing.

Detailed ways:

As shown in Fig. 1, similar to the existing oil well pump, the external hydraulic self-sealing plunger oil well pump of the utility model is equipped with a sucker rod 1, a floating valve 2 and a pump cylinder 5 from top to bottom. The plunger 3; is different from the existing oil well pump:

The upper part of the pump barrel 5 is provided with a sealing section 4, and the lower part is fixedly connected with a fixed valve 6 and a fixed locking support 7. 6 interlinked channels;

The lower end of the locking support seat 8 is fixedly connected with a sub-cavity bridging joint 9, the sub-cavity bridging joint 9 has a horizontal hole 91 and a vertical hole 92 communicating with each other, and the vertical hole 92 communicates with the passage in the middle of the fixed locking support 7;

Set an outer pipe 11 as a flushing pipe or an oil pipe, the outer pipe 11 is sleeved outside the above-mentioned components, and is connected with one side end of the sub-chamber bridging joint 9, the side wall of the outer pipe 11 is connected with the sub-chamber A through hole is provided at the relative position of the horizontal hole 91 of the bridge joint 9; a gap is left between the outer pipe 11 and other parts sleeved therein to form a flushing channel; The valve seat 13 of the valve 10 is fixedly connected to the side wall of the outer tube 11, the bottom through hole of the valve seat 13 communicates with the bottom of the outer tube 11, and the top through hole of the valve seat 13 communicates with the flushing chamber formed by the outer tube 11 and the sub-chamber bridging joint 9 .

By adopting the above design, the utility model places the fixed valve (valve) 6 outside the reciprocating plunger 3 and the pump cylinder 5, which can effectively reduce the pump diameter.

In the optimization scheme of the utility model, in order to achieve the hydraulic self-sealing function of the oil well pump, the sealing section 4 of the pump cylinder 5 adopts an optimized design, as shown in Figure 2, the sealing section 4 is provided with a sealing section shell 41 that can transmit pressure, There is an elastic telescopic sleeve 42 inside, and several wear-resistant sealing rings 43 are stacked inside the elastic telescopic sleeve. Due to the pressure difference between the inside and outside of the sealing section 4, when the pump is on the upstroke, the sealing section 4 and the plunger 3 form a Closely fit to achieve zero leakage; there is a gap with the plunger 3 during the downstroke, and there is no friction. The sealing section 4 can also refer to the design described in another utility model patent 200520112641.2.

In another optimization scheme of the present utility model, in order to pull the oil well pump out of the ground for maintenance, as shown in Figure 1, a group of retractable bosses 44 are provided on the sealing section 4 of the pump barrel, and a set of retractable bosses 44 is provided on the lower part of the plunger 3. The groove 34 that the telescopic boss 44 extends into, when the sucker rod 1 pulls the plunger 3 upward, the groove 34 moves to the position of the telescopic boss 44 so that the telescopic boss 44 is inserted into the groove 34, so that The plunger 3 is connected to the pump barrel 5, and at this time, the sucker rod 1 is pulled up again, so that the fixed locking support 7 fixedly connected with the pump barrel 5 is disengaged from the locking support seat 8, so that the top of the oil well pump The part pulls out of the ground.

In yet another optimized solution of the utility model, an oil pumping channel and a cleaning channel are separately provided. Referring to Fig. 3, a casing 12 is axially sleeved outside the outer pipe (ie flushing pipe/oil pipe) 11, leaving a gap between the casing 12 and the outer pipe 11 to form a well flushing channel. The horizontal hole 91 and the vertical hole 92 of the sub-cavity crossing bridge joint 9 are connected upwards to the channel of the fixed locking support 7, the fixed valve 6, the pump barrel 5, the plunger 3, and the floating valve 2 to form an oil suction channel. and the cavity between the cavity of the outer tube 11, the cavity between the outer tube 11 and the internal installation parts (such as the pump cylinder 5) of the well flushing channel, the backwash valve 10, and the sub-cavity bridging joint 9 are communicated to form Flush the channel. When pumping oil, the backwash valve 10 is closed, and the liquid is lifted to the ground through the oil pumping channel; when the well is flushed, the high-pressure liquid is injected downhole through the well flushing channel and enters the bottom cavity of the outer pipe 11, and the flushing valve 10 is pushed back into the flushing channel , wash the sunk in the oil well pump, and finally return to the ground through the outer pipe 11 to complete the washing operation.

The above multiple optimized designs can be used in combination or used alone. Therefore, the oil well pump of the present utility model can be implemented in various changes, which are not listed here.

By adopting the above design, the utility model achieves the following beneficial effects:

The valve external hydraulic self-sealing plunger oil pump adopts the above scheme, and for the first time, the fixed valve (valve) is placed outside the reciprocating plunger and pump barrel, which can effectively reduce the pump diameter and make the pumping pump of the utility model The oil pump is more suitable for well conditions with a micro-diameter wellbore size between Φ34.9mm and Φ50.8mm, and a production rate of 0.5m ³ /d to 1m ³ /d and small displacement. The new type of pump diameter that has been realized so far is the smallest pump diameter at home and abroad, and this technology has reached the leading level at home and abroad.

There is a sealing section on the pump barrel, and the high pressure outside the pump barrel cavity on the upstroke causes elastic deformation of the elastic telescopic sleeve of the sealing section to form a good seal, and the leakage tends to zero. The resistance tends to zero, and the friction on the upstroke is the effective friction of the load, which reduces the wear on the pump barrel, and the special wear-resistant sealing ring improves the service life of the pump. Under the same conditions, the effective stroke is increased, the downstroke has no friction resistance, the bending of the sucker rod is reduced, the effective stroke is increased, and the pump efficiency is significantly improved.

When inspecting the pump, the oil well pump can be pulled out of the ground smoothly through the plunger, the groove provided on the pump barrel, and the lifting mechanism of the boss. Oil production costs.

When flushing the well, inject high-pressure liquid into the casing. The high-pressure liquid passes through the bottom of the well, opens the backwash valve, enters the outer pipe, and returns to the ground through the outer pipe to complete the flushing operation. This special-channel well washing technology is clean and thorough, which can reduce the number of operations.

Claims (8)

1. A valve external hydraulic self-sealing plunger oil well pump, mainly including a floating valve, a plunger, a pump barrel and a fixed valve, characterized in that: the fixed valve is fixedly connected to the lower part of the pump cylinder, and the floating valve The moving valve is placed on the outer upper part of the plunger. 2. The valve external hydraulic self-sealing plunger oil well pump according to claim 1, characterized in that: the fixed valve at the lower part of the pump cylinder is connected to a fixed locking support, and the fixed locking support is plugged into a Lock in the support seat. 3. The external hydraulic self-sealing plunger oil well pump according to claim 2, characterized in that: the upper end of the pump cylinder is provided with a set of retractable bosses, and the lower part of the plunger is provided with a retractable boss for extension. The timely engagement of the two forms a lifting mechanism that pulls the pump out of the ground. 4. The valve external hydraulic self-sealing plunger oil well pump according to claim 1, characterized in that: an outer tube is coaxially sleeved outside the floating valve, the plunger, the pump barrel and the fixed valve, The fixed valve is connected with a sub-chamber bridging joint, which is provided with an opening outside the outer tube and communicates with the external fixed valve, pump barrel, plunger, and floating valve to form an oil suction channel. 5. The valve external hydraulic self-sealing plunger oil well pump according to claim 3, characterized in that an outer tube is coaxially sleeved on the floating valve, plunger, pump barrel, fixed valve, fixed lock In addition to the tight support and the locking support seat, and a sub-cavity bridge joint is connected under the locking support seat, which is provided with a hole outside the outer tube and communicates with the fixed locking support, fixed valve, and pump barrel , plunger, and swimming valves form an oil suction channel. 6. The external hydraulic self-sealing plunger oil well pump according to claim 4 or 5, characterized in that: a backwash valve is fixed inside the lower end of the outer pipe, and the valve seat of the backwash valve is fixedly connected to the side of the outer pipe The through hole at the bottom of the valve seat communicates with the bottom of the outer tube, and the through hole at the top of the valve seat communicates with the flushing cavity formed by the outer tube and the sub-chamber bridging joint and the cavity between the outer tube and the pump barrel to form a special channel for flushing. 7. The external hydraulic self-sealing plunger oil well pump according to any one of claims 1 to 5, characterized in that: the pump barrel is provided with a sealing section, and the sealing section is provided with a sealing section casing capable of transmitting pressure, and the casing is equipped with There is an elastic telescopic sleeve, and a plurality of wear-resistant sealing rings are stacked in the elastic telescopic sleeve. 8. The external hydraulic self-sealing plunger oil well pump according to claim 6, characterized in that: the pump cylinder is provided with a sealing section, and the sealing section is provided with a sealing section casing capable of transmitting pressure, and an elastic telescopic casing is installed inside the casing. The sleeve is stacked with a plurality of wear-resistant sealing rings in the elastic telescopic sleeve.

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