Combined Oil Well Casing Gas Recovery Device

Abstract

The invention discloses a combined oil well casing gas recovery device. The ground part is a combined three-way assembly, one end of the three-way is connected with the oil pipe gate at the front end of the small four-way, and the other end of the three-way is connected with the front end of the large four-way. The casing gate is connected, and the third end of the tee is provided with a liquid discharge check valve and a shut-off valve; the underground part is an oil-gas mixing pump assembly, and the upper end of the outer working cylinder is connected with the tubing hanger in the large cross at the wellhead Connection, the lower end is connected with the oil well production string, and the inner working barrel is provided with a piston whose upper end is connected with the polished rod and the lower end is connected with the sucker rod; between the outer working barrel and the inner working barrel of the mixing pump is an oil storage chamber. A strip-shaped liquid inlet hole is opened on the side wall of the inner working cylinder. The liquid discharge check valve is opened on the up stroke to discharge liquid, and automatically closed on the down stroke; the exhaust check valve is opened on the down stroke to exhaust, and automatically closed on the up stroke. The invention can solve the phenomenon that oil well casing gas is suppressed for a long time, which leads to the decrease of oil well fluid level, lower production capacity and gas lock.

Description

technical field [0001] The invention relates to the field of oil recovery technology, in particular to a casing gas recovery device. Background technique [0002] In the middle and late stage of oilfield production and development, many oil production blocks have a certain amount of geological blocks with low permeability oil storage structure. Geological blocks with low-permeability oil storage structures are mainly characterized by low production and low pressure of oil well casing gas, and it is difficult to utilize and recover casing gas during production. Part of the natural gas accumulates in the annular space of the oil casing, resulting in a decrease in the pressure holding capacity of the oil well. In severe cases, it will cause a "gas lock" phenomenon, and the discharge will cause pollution to the atmosphere, and at the same time waste precious and non-renewable clean resources. a vicious circle. At present, most of the mature and applied products are constant pr...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a combined oil well casing gas recovery device in view of the current product status and technical defects in this technical field, so as to solve the problem of oil well casing gas holding pressure for a long time, resulting in lower production capacity and gas lock caused by oil well dynamic liquid level drop Phenomenon

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