Jet pump-double-screw pump same-well injection-production composite lifting system and method

Abstract

The invention relates to a jet pump-double-screw pump same-well injection-production composite lifting system and method. The jet pump-double-screw pump same-well injection-production composite lifting system comprises a production system, an underground oil-water separation system and an injection system, wherein an upper connector of the production system is connected with an outlet of an upperscrew pump, and the upper screw pump is connected with a swirler overflow pipe through an upper coupler; an annular space between an oil pipe and a sleeve is separated into a liquid storage cavity through an upper packer and a lower packer; a liquid inlet hole formed in the oil pipe communicates with the liquid storage cavity; a guide blade arranged in the liquid storage cavity is fixed to the oilpipe; one end of a wedge-shaped guide hole in the oil pipe communicates with an inlet of a swirler, and the other end of the wedge-shaped guide hole in the oil pipe is communicated with the liquid storage cavity; the hydrocyclone is arranged in the oil pipe corresponding to the liquid storage cavity, and a swirler underflow pipe is connected with an inlet of a lower screw pump through a lower coupler; and the injection system comprises the lower screw pump, a jet pump and a bridge packer. According to the system and the method, composite lifting is achieved under the condition that a ground power device does not need to be additionally arranged, and the oilfield development cost is greatly reduced.

Description

Technical field: [0001] The invention relates to the technical field of oil field downhole equipment, in particular to a jet pump-twin-screw pump injection-production composite lifting system and method for the same well. Background technique: [0002] At present, my country's main oilfields have entered into a period of high water-cut production. Due to the continuous increase of water cut, the lifting cost is too high, the recovery rate is reduced, and the oil well production is close to or even reaches the economic production limit. When the water content of the production well exceeds 98%, it does not have economic extraction value. [0003] Unexploited horizontal wells have become an important resource that can be developed. With the improvement of horizontal well drilling technology and the sharp drop in drilling costs, horizontal well production technology has been increasingly adopted by miners. Small-displacement deep well oil production is a significant advantage...

AI Technical Summary

Problems solved by technology

However, the inclination angle of the oil well pump (greater than 45°) cannot be too large, and the problem of eccentric wear of the rod and pipe cannot be solved. Conventional pumps will have the opening and closing lag of the valve ball, resulting in a decrease in pump efficiency

At the same time, if power equipment such as screw pumps is added to deep well oil production, it is necessary to add necessary power supply devices on the ground, which increases the complexity of ground devices.

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