CN207093351U - A kind of spherical valve seat mechanical closed-open type oil well pump - Google Patents

Abstract

The utility model relates to a spherical valve seat mechanical opening and closing type oil well pump, which comprises a pump barrel, a bush arranged inside the pump barrel, a fixed valve arranged at the bottom of the bush, and a piston arranged inside the bush. There is a through hole for oil supply in the middle, a sucker rod passes through the through hole, and the end of the sucker rod below the piston is provided with a spherical valve seat for closing the through hole; the sucker rod The part above the piston is provided with a firmware for pushing the piston. The piston through hole of the utility model is forcibly opened or closed along with the up and down movement of the sucker rod, and will not be affected by the viscosity of gas or liquid. During the downstroke, the spherical valve seat is forcibly opened, and the upward force received by the piston will not be transmitted to the sucker rod, and will not cause the sucker rod to bend and deform under pressure. On the other hand, the spherical valve seat and the piston of the utility model are sealed by a spherical surface, the sealing strength is high, and the leakage of the pump is reduced.

Description

A kind of spherical valve seat mechanical opening and closing type oil well pump

technical field

The utility model relates to the technical field of petroleum pipeline equipment, in particular to a spherical valve seat mechanically open-close oil well pump.

Background technique

The oil pump is a common downhole device driven by the pumping unit to pump the crude oil in the well to the surface. Ordinary oil well pumps mainly use the pressure in the pump cavity during the up and down strokes to make the valve open or close. Ordinary oil well pumps are prone to air lock for oil wells with high gas content. During the upstroke, due to the expansion of the gas, the pressure in the pump chamber is not easy to drop, which makes the fixed valve open lag and the loading becomes slower; during the downstroke, the gas is Compression, the pressure in the pump chamber cannot be rapidly increased, and the opening of the floating valve lags behind. In severe cases, only the gas is continuously expanding and compressing during the up and down strokes, and the floating valve and the fixed valve are always closed, forming an air lock. For ordinary oil well pumps, the sucker rod will be subjected to the upward force transmitted by the plunger during the downstroke, causing the sucker rod to bend under pressure and eccentrically wear with the wellbore, reducing the working life of the sucker rod.

Contents of the invention

In order to solve the above problems, the utility model provides a spherical valve seat mechanical open-close type oil well pump which can avoid the phenomenon of bending and eccentric wear of the sucker rod.

The utility model adopts following scheme to realize:

A spherical valve seat mechanical open-close type oil well pump, comprising a pump barrel, a bush arranged inside the pump barrel, a fixed valve arranged at the bottom of the bush, and a piston arranged inside the bush. A through hole through which oil passes, a sucker rod passes through the through hole, and the end of the sucker rod located below the piston is provided with a spherical valve seat for closing the through hole; the sucker rod is located above the piston A part is provided with a firmware for pushing the piston, and when the spherical valve seat is in contact with the lower surface of the piston, there is a gap between the fastener and the upper surface of the piston.

Further, the firmware is a cross joint.

Further, the length dimension of the cross joint is larger than the diameter of the through hole.

Further, a spherical inner recess corresponding to the shape of the spherical valve seat is provided at a position corresponding to the lower end surface of the piston and the spherical valve seat.

Further, the fixed valve is provided with an oil port for oil circulation.

Compared with the prior art, the utility model has the following beneficial effects:

The piston through hole of the utility model is forcibly opened or closed along with the up and down movement of the sucker rod, and will not be affected by the viscosity of gas or liquid. During the downstroke, the spherical valve seat is forcibly opened, and the upward force received by the piston will not be transmitted to the sucker rod, and will not cause the sucker rod to bend and deform under pressure. On the other hand, the spherical valve seat and the piston of the utility model are sealed by a spherical surface, the sealing strength is high, and the leakage of the pump is reduced.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of an embodiment of a spherical valve seat mechanically on-off oil well pump provided by the present invention.

FIG. 2 is a schematic structural diagram of the firmware part of this embodiment.

Detailed ways

In order to facilitate those skilled in the art to understand the utility model, the utility model will be further described in detail below in conjunction with specific embodiments and accompanying drawings.

Referring to Fig. 1 and Fig. 2, a spherical valve seat mechanical open-close type oil well pump provided by the utility model includes a pump barrel 1, a bush 2 arranged inside the pump barrel 1, a fixed valve 3 arranged at the bottom of the bush and a set Piston 4 in bushing. A through hole 41 is arranged in the middle of the piston, and the through hole can be used for oil circulation. Simultaneously, a sucker rod 5 passes through the through hole 41 and the lower end of the sucker rod stretches out to the below of the piston, and the bottom end of the sucker rod 5 is provided with a spherical valve seat 51 for closing the through hole 41 of the piston 4 . The part of the sucker rod 5 above the piston 4 is also provided with a firmware 52 for pushing the piston. The fastener 52 is a cross joint, and the length of the cross joint is greater than the diameter of the through hole 41 . The lower end surface of the piston 4 and the spherical valve seat 51 are provided with a spherical inner recess 42 corresponding to the shape of the spherical valve seat. When the spherical valve seat contacts the piston, the outer surface of the spherical valve seat is close to the spherical inner recess. , the through hole is closed, and there is a space between the firmware and the upper end surface of the piston at this time. An oil port for oil flow is provided at the fixed valve at the bottom of the bushing.

In order to enable those skilled in the art to understand the utility model more clearly, the specific working process of the utility model is described below. During the upstroke, the sucker rod 5 moves upwards, and the spherical valve seat 51 contacts the spherical concave portion 42 of the piston 4 to close the through hole, and at the same time pushes the piston 4 to move upwards. At this time, the volume of the cavity in the bushing 2 becomes larger. Larger, the gas density decreases, the pressure decreases, the fixed valve 3 is opened, and the oil enters the cavity in the bushing 2. During the downstroke, the sucker rod 5 moves downward, the spherical valve seat 51 separates from the spherical concave portion 42 of the piston 4, the firmware 52 contacts the piston, pushes the piston 4 to move downward, and the fixed valve 3 closes. The oil can flow out from the through hole of the piston.

The piston through hole of the utility model is forcibly opened or closed along with the up and down movement of the sucker rod, and will not be affected by the viscosity of gas or liquid. During the downstroke, the spherical valve seat is forcibly opened, and the upward force received by the piston will not be transmitted to the sucker rod, and will not cause the sucker rod to bend and deform under pressure. On the other hand, the spherical valve seat and the piston of the utility model are sealed by a spherical surface, the sealing strength is high, and the leakage of the pump is reduced.

Although the description of the utility model is made in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above contents. Accordingly, all such alternatives, improvements and changes are intended to be included within the scope of the appended claims.

Claims (5)

1. a kind of spherical valve seat mechanical closed-open type oil well pump, it is characterised in that including pump barrel（1）, the lining that is arranged inside pump barrel Set（2）, be arranged on the standing valve of sleeve（3）, and the piston located at bush inside（4）, the piston（4）Centre is set There is the through hole that a fuel feeding passes through（41）, a sucker rod（5）Through the through hole, and sucker rod is located at piston（4）The end of lower section One is provided with to be used to close the through hole（41）Spherical valve seat（51）；The sucker rod（5）Positioned at piston（4）The part of top It is provided with a firmware for being used to promote piston（52）, when the spherical valve seat（51）With piston（4）Lower surface contact when, it is described Firmware（52）There is interval between the upper surface of piston.

2. spherical valve seat mechanical closed-open type oil well pump according to claim 1, it is characterised in that the firmware（52）For ten Word joint.

3. spherical valve seat mechanical closed-open type oil well pump according to claim 2, it is characterised in that the length of the cruciform joint Degree size is more than the through hole（41）Diameter.

4. spherical valve seat mechanical closed-open type oil well pump according to claim 3, it is characterised in that the piston（4）Under End face at spherical valve seat opposite position with being provided with sphere inner fovea part corresponding with spherical seat shape（42）.

5. spherical valve seat mechanical closed-open type oil well pump according to claim 1, it is characterised in that the standing valve（3）Place Hydraulic fluid port provided with fuel feeding circulation（31）.