Upper layer low pressure and negative pressure separate mining device

Abstract

The invention discloses an upper layer low pressure and negative pressure separate mining device. The upper layer low pressure and negative pressure separate mining device comprises a main body, a pipework, a spraying nozzle, a pressing cap, a ball valve and a valve seat; a first eccentric through hole and a second eccentric through hole which are formed in the top face of the main body communicate with a central through hole formed in the bottom face of the main body; the valve seat and the ball valve are plugged at the end of the top end of the first eccentric through hole and the communicating position of the first eccentric through hole and the central through hole, and a communicating hole between the first eccentric through hole and the second eccentric through hole is located above the ball valve; the pipework is mounted in the second eccentric through hole in a plugging mode, and a central hole channel of the pipework communicates with the second eccentric through hole; the inner diameter of the bottom end of the pipework is increased and provided with the spraying nozzle, so that the central hole channel of the pipework communicates with the central hole channel of the spraying nozzle; the pressing cap is arranged below a flow hole formed in the inner wall of the main body, and the central axis of a third eccentric through hole formed in the center of the pressing cap overlaps with that of the second eccentric through hole, so that the spraying nozzle is located on the inner side of the top end of the third eccentric through hole; and the upper layer low pressure and negative pressure separate mining device solves the problem that the differential pressure between layers results in backward flowing from a high pressure layer to a lower pressure layer in the multi-layer mining process, and the joint mining of multiple layers is achieved.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to an upper-layer low-pressure negative pressure separate production device. Background technique [0002] With the passage of oilfield development time, most of the oil wells have entered the stage of high recovery, and the difficulty of improving the recovery rate is increasing year by year, and the difficulty of measures is increasing. During the oilfield development process in recent years, single-layer production or multi-layer combined production is the main method. After multi-layer commingled production, the production of some oil wells did not increase as expected, and there were even extreme cases of negative production growth. Usually, the interlayer pressure difference between the original mining layer and the newly opened layer is as high as 5MPa, and the interlayer contradiction is very prominent, resulting in the phenomenon of backflow from the high pre...

AI Technical Summary

Problems solved by technology

However, there is a problem that the structure is complex, the negative pressure generated is small, and the size of the fluid channel in the low-pressure area is small, so that it can adapt to the small pressure difference between layers (mostly within 1MPa). Layers cause plugging, the scope of application is limited, it cannot meet the existing needs, and it has not been widely used in oilfields

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