CN200943572Y - Base-weighted oil well pump - Google Patents

Abstract

A defueling pump with increased weight of the bottom comprises an upper pump barrel, an upper plunger, an oil outlet valve set, an oil inlet valve (4), a lower pump barrel, a lower plunger, a release joint, a connecting-tripping device and a weight rod. The upper plunger is arranged in the upper pump barrel, the lower part of the upper plunger is connected with the oil outlet valve set, the lower part of the oil outlet valve set is connected with the lower plunger, the lower part of the lower plunger is connected with the connecting-tripping device, the lower part of the connecting-tripping device is connected with the weight rod, the lower part of the upper pump barrel is connected with the upper part of the oil inlet valve, the lower part of the oil inlet valve is connected with the upper part of the lower pump barrel, the lower part of the lower pump barrel is connected with the release joint, the thread shaft line connected between the upper part of the valve body in the oil inlet valve as well as the thread shaft line connected with the lower pump barrel in the lower part is not overlaid with the shaft line of the cylinder on the outer surface of the valve body. When the oil pushing rod travels downwards, a feedback force downwards is created, the feedback force and the weigh rod overcomes the resistance of the oil pushing rod downwards to prevent the eccentrical wear when the oil pushing rod travels downwards. The valve body has a eccentrical structure, which increase the diameter of the valve ball and make the valve ball more flexibly operating in ropy oil and closed down timely so as to improve the reliability of the ropy oil pump.

Description

Oil well pump is increased the weight of in the bottom

One, technical field

The utility model is the Special subsurface pump that the oil-field thick-oil pumping well is used, and oil well pump is increased the weight of in particularly a kind of bottom.

Two, background technique

The 89201356.7 hydraulic pressure feedback thick oil pump of prior art, the long polished rod of smooth solid cylinder is equipped with in the lower end, and its lower end is the guiding awl, under the guiding awl other parts is not installed, only overcome the descending resistance of sucker rod when descending, can not eliminate the buckling problem of sucker rod when descending fully by feedback force.The oiling valve of this pump adopts loop configuration, is distributed on the valve body by a plurality of valve balls, valve seat, and is malfunctioning if any a valve ball, valve seat, hydraulic pressure feedback thick oil pump just can not be pumped, and the oiling valve of this structure, the valve ball diameter is little, it is ineffective to be easy to work in viscous crude, causes that oil well is not fuel-displaced.

Three, summary of the invention

The objective of the invention is to design a kind of bottom and increase the weight of oil well pump, make under its pump and can be with weighted lever, increase descending power, prevent line bend eccentric wear under the sucker rod.Valve body is an eccentric structure, has increased the valve ball diameter, and it is worked in thick oil well flexibly, closes immediately, improves the reliability of thick oil pump.

The purpose of this utility model is achieved in that by last pump barrel, upper plug, the outlet valve group, oiling valve, following pump barrel, lower plunger is formed, upper plug is in the pump barrel, the upper plug bottom connects the outlet valve group, outlet valve group bottom connects lower plunger, the lower plunger bottom connects connecting-and-unconnecting device, the connecting-and-unconnecting device bottom connects weighted lever, last pump barrel bottom connects oiling valve top, the oiling valve bottom connects pump barrel top down, following pump barrel bottom connects releasing-joint, and the axis of thread that screw thread that valve body top connects with last pump barrel in the oiling valve and bottom connect with following pump barrel does not overlap with the valve outer surface cylinder axis.

The beneficial effects of the utility model are: when sucker rod is descending, the pump pressure outside is low, the area that high pressure is born in the upper plug upper-end surface bears the area of high pressure greater than the lower end surface, under area difference and pressure difference effect, produce a downward feedback force, this feedback force helps sucker rod descending, thereby overcomes the descending resistance of sucker rod, because the lower plunger bottom has connected the weighted lever of constant weight, increase descending power, prevented line bend eccentric wear under the sucker rod.Valve body is an eccentric structure, has increased the valve ball diameter, and it is worked in thick oil well flexibly, closes immediately, has improved the reliability of thick oil pump.

Four, description of drawings

Attached is the utility model embodiment's erection drawing.

Five, embodiment

Below in conjunction with accompanying drawing the utility model embodiment is described.

Embodiment of the present utility model is by last pump barrel 1, upper plug 2, outlet valve group 3, oiling valve 4, following pump barrel 5, lower plunger 6, releasing-joint 7, connecting-and-unconnecting device 8, weighted lever 9 is formed, upper plug 2 is in the pump barrel 1, upper plug 2 bottoms connect outlet valve group 3, outlet valve group 3 bottoms connect lower plunger 6, lower plunger 6 bottoms connect connecting-and-unconnecting device 8, connecting-and-unconnecting device 8 bottoms connect weighted lever 9, last pump barrel 1 bottom connects oiling valve 4 tops, oiling valve 4 bottoms connect pump barrel 5 tops down, following pump barrel 5 bottoms connect releasing-joint 7, and the axis of thread that screw thread that valve body top connects with last pump barrel 1 in the oiling valve 5 and bottom connect with following pump barrel 6 does not overlap with the valve outer surface cylinder axis.

Upper plug 2 tops connect sucker rod, and when the pumping unit upstroke of ground, it is up that pumping unit drives sucker rod, upper plug 2, outlet valve group 3, lower plunger 6, connecting-and-unconnecting device 8, weighted lever 9, outlet valve group 3 is closed, the oil suction chamber volume increases, and pressure descends, and oiling valve 4 is opened.When the pumping unit down stroke of ground, sucker rod, upper plug 2, outlet valve group 3, lower plunger 6, connecting-and-unconnecting device 8, weighted lever 9 are descending, and the oil suction chamber volume reduces, and pressure rises, and oiling valve 4 cuts out, and outlet valve group 3 is opened.At this moment the pump pressure outside is low, the area that high pressure is born in upper plug 2 upper-end surfaces bears the area of high pressure greater than the lower end surface, therefore, under area difference and pressure difference effect, produce a downward power, be called feedback force, the gravity of feedback force and weighted lever helps sucker rod descending, thereby overcome the descending resistance of sucker rod, eliminate line bend under the sucker rod, avoid the wilfully mill between sucker rod and the oil pipe, make the oil well ordinary production, increase the manufacture cycle.Because the weighted lever diameter is greater than the diameter of following pump barrel 5, weighted lever is lowered to earlier with pump, by connecting-and-unconnecting device lower plunger 6 and weighted lever 9 is connected into one.Releasing-joint is that weighted lever and lower plunger 6 are thrown off, and is convenient to propose the sucker rod operation.

Claims (1)

1, oil well pump is increased the weight of in a kind of bottom, by last pump barrel (1), upper plug (2), outlet valve group (3), oiling valve (4), following pump barrel (5), lower plunger (6) is formed, it is characterized in that: upper plug (2) is in the pump barrel (1), upper plug (2) bottom connects outlet valve group (3), outlet valve group (3) bottom connects lower plunger (6), lower plunger (6) bottom connects connecting-and-unconnecting device (8), connecting-and-unconnecting device (8) bottom connects weighted lever (9), last pump barrel (1) bottom connects oiling valve (4) top, oiling valve (4) bottom connects pump barrel (5) top down, following pump barrel (5) bottom connects releasing-joint (7), and the axis of thread that screw thread that valve body top connects with last pump barrel (1) in the oiling valve (5) and bottom connect with following pump barrel (6) does not overlap with the valve outer surface cylinder axis.

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