CN2233472Y - Underground oil-pumping air pump for oil pumping well - Google Patents

Abstract

The utility model relates to an oil and air pumping pump under the well of an oil pumping well, comprising an upper joint, a pump barrel, a plunger assembly, a fixing valve assembly, and a lower joint. A middle cavity chamber is arranged on the middle part of the pump barrel. The utility model has the advantages that an air compressure phenomenon in the process of oil pumping is overcome, the efficiency of the oil and air pumping pump under the well of an oil pumping well is enhanced, output is increased, and the oil and air pumping pump under the well of an oil pumping well has simple structure and convenient use.

Description

Pumping well down-hole oil pumping extraction pump

The utility model belongs to a kind of oil field oil rig, the oil pumping extraction pump that use particularly a kind of pumping well down-hole.

The oil field can not blowing production because oil bearing bed pressure descends, and present most oil wells adopt oil well pumps to make oil well continue produce oil.Pumping well is reduced to saturation pressure owing under the formation pressure, and therefore existing a large amount of natural-gas exist in oil reservoir, and oil well is in the production crude oil while also a large amount of rock gases of association.Common oil well pump is when plunger is up, the pump barrel standing valve is opened, air-flow enters pump barrel, when plunger is descending, the following valve ball that moves about of plunger still is positioned on the valve ball seat, it bears two pressure in upper and lower, the pressure on valve ball top is that the pressure of gas-liquid in the whole oil pipe adds wellhead back pressure, the pressure of bottom is that reservoir flowing pressure deducts the gas-liquid column pressure of pump intake to oil reservoir, the deep-well bottom pressure is more little more for oil reservoir under the oil well pump, valve ball up and down to bear pressure difference just big more, so when plunger is descending, two-part pressure difference about valve ball must at first overcome, at ball bottom pressure during greater than the ball upper pressure, gas-liquid just can enter plunger and be sucked out well head in the pump barrel, but because the oil reservoir gas-liquid enters pump barrel simultaneously, and the compressibility of gas is very big, so when valve ball is descending when overcoming pressure difference, gas at first is compressed in the pump barrel, the oil well pump gas that Here it is often the says phenomenon that contracts, and its result makes plunger stroke loss, the efficient of pump descends significantly.

The purpose of this utility model provides a kind of improved pumping well down-hole oil pumping extraction pump, overcomes the gas phenomenon that contracts, and improves the efficient of pump, increases output.

The purpose of this utility model is achieved in that it comprises upper connection, pump barrel, plunger piston assembly, standing valve assembly and lower contact, is characterized in that: at the pump barrel middle part intermediate cavity is set.

Its working principle is: up when plunger, the valve ball of standing valve is opened, and the oil reservoir gas-liquid enters pump barrel, the travelling valve ball is closed, and the oil well oil extraction is when the plunger lower end is left working barrel and entered intermediate cavity, the gas that enters pump barrel enters intermediate cavity, and plunger to upstroke finishes; When plunger was descending, the valve ball of standing valve was closed, and travelling valve is opened, liquid enters plunger, when the upper end of plunger enters intermediate cavity, is present on the gas in the intermediate cavity and escapes, intermediate cavity is full of by fluid simultaneously, to the down stroke end, has finished an oil pumping cycle like this.

The utility model has the advantages that: overcome the gas phenomenon that contracts, improved the efficient of pump, increased output, simple in structure, easy to use, be applicable to the oil well that gas liquid ratio is big.

Below in conjunction with accompanying drawing embodiment of the present utility model is described:

Fig. 1 is a structural representation of the present utility model.

Fig. 2, Fig. 3 are respectively the schematic cross-sectional view of two kinds of shape intermediate cavity.

See Fig. 1, concrete structure is as follows: the upper end scyewed joint upper connection 8 of pump barrel 6, the lower end screw thread of pump barrel 6 valve assembly 2 that is connected and fixed, pump barrel 6 middle parts are symmetrical arranged two intermediate cavity 5, plunger piston assembly 7 is housed in the pump barrel 6, travelling valve ball 4 is housed on the valve opening of plunger piston assembly 7, standing valve ball 3 is housed on the valve opening of standing valve assembly 2, the 2 lower end scyewed joint lower contacts 1 of standing valve assembly.See Fig. 2, intermediate cavity 5 is two symmetrical chamber, and intermediate cavity 5 directly connects with pump barrel 6 inner chambers.See Fig. 3, intermediate cavity 5 is an annular cavity, and 3 through holes 9 are arranged on the pump barrel barrel, links up intermediate cavity 5 and pump barrel inner chamber.

Claims (3)

1, a kind of pumping well down-hole oil pumping extraction pump comprises upper connection, pump barrel, plunger piston assembly, and standing valve assembly and lower contact is characterized in that: at the pump barrel middle part intermediate cavity is set.

2, pumping well down-hole oil pumping extraction pump according to claim 1, it is characterized in that: intermediate cavity is two symmetrical chamber.

3, pumping well down-hole oil pumping extraction pump according to claim 1, it is characterized in that: intermediate cavity is an annular cavity.

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