Anti-gas assisted pumping heavy oil pump

Abstract

An anti-gas assisted pumping heavy oil pump comprises an upper pump barrel, an upper plunger, a discharge valve, a communication joint, a suction valve, a lower plunger, a lower pump barrel, a connecting pipe, a gas-liquid diversion joint, a centrifugal separation device, an outer barrel, a base and a screw rod; the screw rod reciprocates up and down during oil pumping, and the centrifugal separation device is rotated under the thread effect; the gas density is different from liquid density; when gas-liquid mixtures are rotated, liquid is located at an outer layer, and gas is located at an inner layer; the gas enters a wellbore through an exhaust groove from a gas channel, and the liquid enters a pump cavity through a liquid channel, and is pumped out; the gas-liquid mixtures are rotated due to external forces, so that the separation effect is good; a feedback oil pump is composed of the upper pump barrel, the upper plunger, the discharge valve, the communication joint, the suction valve, the lower plunger and the lower pump barrel, and downward feedback force can be generated; the friction force with heavy oil during descending of a sucker rod can be overcome, and thus the heavy oil pump can work in a heavy oil well properly; since the heavy oil is stirred when passing through the centrifugal separation device, the fluidity of the heavy oil can be improved, thereby benefitingpumping of the heavy oil.

Description

technical field [0001] The present invention is equipment for oil production and workover, a device for pumping wells, and a heavy oil pump that prevents gas and assists in pumping. Background technique [0002] In the existing oil pumping wells with high oil-gas ratio, the gas enters the oil well pump, which reduces the fullness of the oil well pump and reduces the pump efficiency of the oil well. The valve cannot be opened, and the oil well pump cannot pump out oil. In order to solve the influence of gas on the oil well pump, an air anchor is generally used to separate the gas from the casing and reduce the gas entering the oil well pump. The existing simple gas The anchor only separates the gas and liquid by changing the flow direction under the action of the gas-liquid density difference. When this kind of gas anchor is used, the gas is easily entrained by the oil and it is difficult to separate, and the gas-liquid sharing effect is very poor. The existing gas anchor al...

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Problems solved by technology

[0002] In the existing oil pumping wells with high oil-gas ratio, the gas enters the oil well pump, which reduces the fullness of the oil well pump and reduces the pump efficiency of the oil well. The valve cannot be opened, and the oil well pump cannot pump out oil. In order to solve the influence of gas on the oil well pump, an air anchor is generally used to separate the gas from the casing and reduce the gas entering the oil well pump. The existing simple gas The anchor just changes the flow direction and separates the gas and liquid under the action of the gas-liquid density difference. When this kind of gas anchor is used, the gas is easily entrained by the oil and it is difficult to separate, and the gas-liquid sharing effect is very poor.

The existing gas anchor also installs threaded ribs in the annular channel that turns to flow, so that it forms a spiral channel, and the liquid-gas mixture flows in the spiral channel, resulting in centrifugal separation, but because there is no external force to rotate the gas-liquid mixture, it depends on the flow rate. The size of the rotation produces a certain rotation speed, which is difficult to separate the gas from the liquid flow well, so its use effect is still not good

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