Combined-type oil well casing gas recovery device

Abstract

The invention discloses a combined-type oil well casing gas recovery device. The ground part is a combined-type tee assembly, one end of a tee is connected with an oil pipe gate at the front end of a small cross, another end of the tee is connected with a casing gate at the front end of a large cross, and the third end of the tee is provided with a liquid discharge check valve and a stop valve. The underground part comprises an oil-gas mixing pump assembly, the upper end of an outer working barrel is connected with an oil pipe hanger in the large cross of a wellhead, the lower end of the outer working barrel is connected with an oil well production tubular column, and a piston with the upper end being connected with a polish rod and the lower end being connected with a sucker rod is arranged in an inner working barrel. An oil storage chamber is arranged between the outer working barrel of a mixing pump and the inner working barrel of the mixing pump. A strip-shaped liquid inlet is formed in the lateral wall of the inner working barrel. The liquid discharge check valve is opened during upstroke to discharge liquid and closed automatically during down-stroke. A gas exhaust check valve is opened to exhaust gas during down-stroke and closed automatically during upstroke. The combined-type oil well casing gas recovery device can solve the phenomena of descending of the working fluid level of an oil well, productivity reduction and gas locking caused due to the fact that oil well casing gas builds the pressure for a long time.

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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