Unpowered casing gas recovery device

Abstract

An unpowered casing gas recovery device comprises a first cylinder barrel, a middle body and a second cylinder barrel which are connected. A piston rod is arranged in the first cylinder barrel, the middle body and the second cylinder barrel, and a first piston and a second piston are arranged at the two ends of the piston rod. An air inlet channel and an air outlet channel are formed in the middlebody, a first check valve used for controlling casing gas to enter a rod cavity of the first cylinder barrel is arranged in the air inlet channel, and a second check valve used for controlling the casing gas in the rod cavity of the first cylinder to be discharged is arranged in the air outlet channel. The middle body is provided with a balance air way provided with an air filter. A ball valve and a third check valve used for controlling crude oil in an oil well to flow into an oil conveying pipe network are connected between the ends, away from the middle body, of the first cylinder barrel and the second cylinder barrel in parallel. A valve rod of the ball valve is provided with a connecting rod with a gear. An inserting hole is formed in the position, corresponding to the ball valve, onthe middle body. The middle body is internally provided with a push rod in a penetrated mode, and a rack is arranged in the middle of the push rod in the length direction. The end, away from the valve rod, of the connecting rod is located in the middle body via the inserting hole, and the gear is arranged on the inner section of the inserting hole and meshes with the rack. According to the unpowered casing gas recovery device, the casing gas can be effectively recycled.

Description

technical field [0001] The invention relates to an unpowered sleeve gas recovery device. Background technique [0002] At present, when crude oil is exploited, the pumping unit communicates with the oil well through the oil extraction pipe and the casing that are connected inside and outside, and an annular space is formed between the oil suction pipe and the casing; during the crude oil extraction process, as the crude oil in the oil well output, part of the associated gas (commonly known as casing gas or wellhead natural gas) will be stored in the annular space, and the pressure of the casing gas will increase with the increase of crude oil production, which will lead to a decrease in crude oil production. The oil pump will appear "air lock" phenomenon, affecting the pump efficiency. [0003] Generally, in most domestic oil wells, the crude oil pressure in the oil extraction pipe is 0.3-0.8mpa, and the casing gas pressure in the annular space is 0.15-0.20mpa. [0004] On...

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Problems solved by technology

[0004] One of the methods to deal with casing gas is to "vent" at regular intervals. The direct discharge of casing gas will seriously pollute the atmospheric environment, and its pollution level is 21 times that of carbon dioxide pollution. The health of surrounding residents

[0005] Casing gas contains a large amount of hydrogen sulfide, if the hydrogen sulfide concentration is greater than 600mg / m in the process of gas use 3 When it is used, it will endanger human life. For workers on duty in the field at night, using casing gas for heating will bury safety hazards if they are not careful.

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