CN206668524U - Hydraulic piston pump - Google Patents

Abstract

The utility model relates to a hydraulic piston pump, which relies on a ground pump to provide power fluid and realizes automatic direction change underground. Including baffle plate, guide hole, annular flow channel, communication hole, valve seat, piston upper chamber, piston middle chamber, piston lower chamber, valve stem, valve stem centralizing device, sealing ring, support sleeve, fixed valve, suction valve, Exhaust valve. The position and principle of the reversing valve of the hydraulic piston pump are different from those of the traditional hydraulic piston pump, and the reversing valve is located at the upper end of the pump. The cross-sectional size of the valve stem is different at different positions, and the direction of the force on the valve stem is different to drive the valve stem to move up and down. The movement of the valve stem drives the change of the position of the reversing valve, thereby realizing automatic reversing. The piston upper chamber and the middle chamber are variable pressure chambers, and there is no sudden change in pressure change, which makes the device commutation stable and reliable in operation. The closed power fluid system reduces power fluid treatment and maintenance costs, reduces fluid erosion and wear, and has a long working life. It is an ideal equipment for deep and ultra-deep wells.

Description

hydraulic piston pump

technical field

The utility model relates to a hydraulic piston pump for oil well exploitation, and belongs to the technical field of petroleum rodless oil extraction.

Background technique

The hydraulic piston pump is an important branch of the rodless pump and an important means of mechanical oil recovery. Facts have shown that hydraulic piston pumps are irreplaceable in some occasions. As the depth of the reservoir increases, the temperature at the bottom of the well increases, the pressure at the bottom of the well increases, the water cut increases, and the viscosity increases. The problem that conventional oil production equipment cannot adapt to this has become increasingly prominent. Due to its high efficiency (0.57-0.68), hydraulic piston pumps can operate efficiently in deep and ultra-deep wells, inclined wells, high-viscosity oil, and high-wax wells, and have always occupied an important position in existing oil production equipment.

Several rodless hydraulic oil well pump patents have been applied for in recent years, but all have their own deficiencies. Application No. 200710099747.7, the structure of the rodless hydraulic oil well pump is too complex, with too many accessories, high failure rate and insufficient overall reliability. Application number 201210534633.1, although the reversing valve of the hydraulic piston pump is feasible in principle, but because the structure of the reversing device is also very complicated, there are a lot of sealing rings, the requirements for processing, manufacturing and assembly are very high, and it has been popularized and applied on a large scale Still difficult.

Contents of the invention

The utility model provides an underground automatic reversing hydraulic piston pump. The pump has three independent pressure changing chambers, can realize stable automatic reversing, and has high reliability.

The utility model provides a closed power fluid system, water and crude oil can be used as the power fluid, which reduces the cost of power fluid treatment and maintenance, reduces the wear of the hydraulic motor part, and prolongs the service life.

The technical scheme of the utility model is: a hydraulic piston pump, characterized in that: the reversing valve end cover is on the upper end of the reversing valve body, the reversing valve body and the valve seat are matched and connected to form a dynamic seal, the reversing valve valve There is a sealing ring and a first communication hole on the body, the first communication hole communicates with the first flow channel, an annular flow channel is formed between the reversing valve body and the valve seat, the support sleeve is under the valve seat, and the support sleeve has a second communication channel. hole, the second communication hole communicates with the second flow channel, the lower end of the support sleeve is the support sleeve, the communication hole on the support sleeve forms the fourth flow channel with the pump body, the baffle plate is fixedly connected with the valve stem, and the pump has three variable pressure chambers chamber, and the upper piston is variable in diameter. When the valve stem moves to the end of the stroke, the baffle plate and the reversing valve end cover drive the reversing valve body to move up and down to realize automatic reversing. The up and down movement causes the cavity and pressure of the piston lower chamber to change, and the fixed valve, the suction valve, and the exhaust valve alternately close and open to suck and discharge the production liquid from the piston lower chamber.

The hydraulic piston pump has three pressure-changing chambers, the upper chamber of the piston, the middle chamber of the piston, and the lower chamber of the piston. The power fluid can only enter the upper chamber of the piston and the middle chamber of the piston, and the lower chamber of the piston is an independent lifting chamber for liquid production. .

In the hydraulic piston pump, the upper piston chamber and the piston middle chamber are separated by the upper piston, and the upper piston moves up and down along with the valve stem.

In the hydraulic piston pump, the upper piston is variable in diameter, the valve stem at the upper end has a smaller diameter, and the valve stem at the lower end has a larger diameter. When the piston downstrokes, the power fluid enters the upper piston cavity and the piston middle cavity at the same time. The area of the upper end surface of the valve is larger than that of the lower end surface, the valve stem is subjected to a downward force, and the valve stem moves downward.

In the hydraulic piston pump, the valve stem is equipped with a valve stem centralizing device to prevent the position of the valve stem from shifting and moving, and the valve stem centralizing device is provided with a sealing ring 1 to prevent power fluid from entering the lower chamber of the piston.

In the hydraulic piston pump, the baffle is fixed on the valve stem, and the baffle will push the valve body of the reversing valve to move upward during the upstroke of the pump.

The hydraulic piston pump has a fixed valve directly above the suction valve and has a compact structure.

The utility model belongs to the rodless oil production equipment, which solves the eccentric wear problem in the rod oil production equipment, avoids production accidents such as sucker rod breakage, and adopts a new reversing device, so that there is no sudden change in the pressure change of the variable pressure chamber, and the reversing There is no sudden change in speed, the overall structure is simple and reliable, and the closed power fluid system is adopted, which reduces the cost of power fluid treatment and maintenance, reduces the wear and tear of the hydraulic motor, and prolongs the service life.

Description of drawings

Fig. 1 is a structural cross-sectional view of the hydraulic piston pump of the present utility model during the upstroke.

Fig. 2 is a structural cross-sectional view of the hydraulic piston pump of the present invention during its downstroke.

Fig. 3 is a cross-sectional view of the structure of the reversing valve body during the upstroke of the hydraulic piston pump of the present invention.

detailed description

The technical scheme of the utility model is described in detail below in conjunction with the accompanying drawings: first look at Fig. 1, the reversing valve end cover 1 is on the upper end of the reversing valve valve body 15, and the reversing valve valve body 15 is connected with the valve seat 5 to form a dynamic Sealing, there is a sealing ring 24 and the first communication hole 4 on the reversing valve body 15, the first communication hole 4 communicates with the first flow channel 6, and an annular flow channel 3 is formed between the reversing valve valve body 15 and the valve seat 5, Below the valve seat 5 is a support sleeve 26, the second communication hole 16 is arranged on the support sleeve 26, the second communication hole 16 is communicated with the second flow channel 14, the support sleeve 26 lower end is a support sleeve 25, and the communication hole and the second communication hole are arranged on the support sleeve 25. The pump body forms a fourth flow channel 18, and the baffle plate 7 is fixedly connected with the valve stem 13. The pump has three pressure-transforming chambers, the piston upper chamber 8, the piston middle chamber 10, and the piston lower chamber 12. The valve stem 13 is equipped with a valve The rod centralizing device 11 prevents the position of the valve rod 13 from shifting.

As shown in Figure 3 and Figure 1, the upper conical surface of the reversing valve body 15 forms a seal with the valve seat 5 during the upstroke, and at this time, the high-pressure power fluid enters the reversing valve body 15 through the diversion hole 2 The annular space, then enters the fourth flow channel 18 through the communication hole of the support sleeve 25, and finally reaches the piston cavity 10. Under the action of the power fluid, the valve stem 13 moves upward, and the piston lower chamber 12 forms a negative pressure. At this time, the fixed valve 20 and the suction valve 21 are opened, the discharge valve 22 is closed, and the production fluid enters the piston lower chamber 12 . The valve rod 13 continues to move upwards, and the dead power fluid in the piston upper chamber 8 passes through the first flow channel 6, passes through the first communication hole 4 of the valve seat 5, passes through the communication hole of the support sleeve 26, and is discharged through the second flow channel 14. When the valve stem 13 moves upward, the baffle plate 7 moves upward along with the valve stem, and then the baffle plate 7 touches the lower end of the reversing valve body 15, and pushes the reversing valve body 15 to move upward, when the reversing valve body 15 When the upper end and the valve seat 5 are just separated from the seal, the high-pressure power fluid enters the annular flow channel 3, enters the first flow channel 6 through the first communication hole 4, and finally enters the piston upper chamber 8. At this time, the valve stem 13 is subjected to a downward force , the upward speed of the valve stem 13 slows down until the upper end of the reversing valve body 15 and the valve seat 5 are completely separated from the seal. Upper limit position, now the valve rod 13 speed slows down to zero.

As shown in Figure 2, when the bottom is formed, the high-pressure power fluid enters the annular flow channel 3, enters the first flow channel 6 through the first communication hole 4, and finally enters the piston upper chamber 8. At this time, the piston upper chamber 8 and the piston middle chamber 10 are both There is high-pressure power fluid, because the downward action area of the piston upper chamber 8 high-pressure power fluid is larger than the upward action area of the piston middle chamber 10 high-pressure power fluid, the valve stem 13 is subjected to a downward force, and the valve stem 13 begins to descend. The dead power fluid in the piston cavity 10 passes through the fourth channel 18 and is discharged through the annular space of the reversing valve body 15 . When the valve stem 13 goes down, under the action of pressure, the fixed valve 20 and the suction valve 21 are closed, the discharge valve 22 is opened, and the production fluid is discharged through the third channel 17 . Until the reversing valve end cap 1 acts on the upper end of the reversing valve body 15 to make the reversing valve body 15 move downward to the lower limit position, the hydraulic piston pump's downstroke ends.

The utility model realizes oil production through reasonable hydraulic transmission, solves problems such as sucker rod breakage and eccentric wear in rod oil production equipment, reduces the occurrence of production accidents, and has the advantages of simple structure, large bottom depth, strong reliability, Long life and other advantages.

The above only refers to the embodiment of the utility model, and some improvements made by those of ordinary skill in the technical field without departing from the principle of the utility model should also belong to the protection scope of the utility model.

Claims (7)

1. A hydraulic piston pump, characterized in that: the reversing valve end cover (1) is on the upper end of the reversing valve body (15), and the reversing valve body (15) is connected with the valve seat (5) to form a dynamic Sealing, the reversing valve body (15) has a sealing ring 2 (24) and the first communication hole (4), the first communication hole (4) communicates with the first flow channel (6), the reversing valve body (15 ) and the valve seat (5) form an annular flow channel (3), under the valve seat (5) is the support sleeve 2 (26), and the support sleeve 2 (26) has a second communication hole (16), the second communication The hole (16) communicates with the second flow channel (14), the lower end of the support sleeve 2 (26) is the support sleeve 1 (25), and the communication hole on the support sleeve 1 (25) forms the fourth flow channel (18) with the pump body , the baffle (7) is fixedly connected with the valve stem (13), the pump has three variable pressure chambers, and the upper piston (9) is variable diameter, when the valve stem (13) moves to the stroke end, the baffle (7) And the reversing valve end cover (1) drives the reversing valve body (15) to move up and down to realize automatic reversing. The valve stem (13) is equipped with a valve stem centering device (11), and the up and down movement of the valve stem (13) causes the piston The cavity and pressure of the lower chamber (12) change, the fixed valve (20), the suction valve (21) and the exhaust valve (22) are closed and opened alternately to suck and discharge the production liquid from the piston lower chamber (12). 2. The hydraulic piston pump according to claim 1, characterized in that: the pump has three variable pressure chambers, the piston upper chamber (8), the piston middle chamber (10), the piston lower chamber (12), and the power fluid only It can enter the piston upper chamber (8) and the piston middle chamber (10), and the piston lower chamber (12) is an independent chamber for lifting the production liquid. 3. The hydraulic piston pump according to claim 1, characterized in that: the piston upper chamber (8) and the piston middle chamber (10) are separated by the upper piston (9), and the upper piston (9) follows the valve stem (13 ) up and down. 4. The hydraulic piston pump according to claim 1, characterized in that: the upper piston (9) is variable in diameter, the valve stem (13) at the upper end has a smaller diameter, and the valve stem (13) at the lower end has a larger diameter. When the piston strokes down, the power fluid enters the piston upper chamber (8) and the piston middle chamber (10) at the same time. Since the upper end surface area of the upper piston (9) is larger than the lower end surface area, the valve stem (13) receives a downward force, Valve stem (13) descends. 5. The hydraulic piston pump according to claim 1, characterized in that: the valve stem (13) is equipped with a valve stem centralizing device (11) to prevent the position of the valve stem (13) from shifting and moving, and the valve stem centralizing device (11) There is a sealing ring 1 (23) to prevent power fluid from entering the piston lower cavity (12). 6. The hydraulic piston pump according to claim 1, characterized in that: the baffle (7) is fixed on the valve stem (13), and the baffle (7) will push the reversing valve body (15) when the pump is upstroke ) upward movement. 7. The hydraulic piston pump according to claim 1, characterized in that: the fixed valve (20) is directly above the suction valve (21), and has a compact structure.