Crude oil dissolved gas downhole collection device

Abstract

The invention provides a downhole collection device for crude oil dissolved gas, which includes two sets of collection devices for collecting dissolved gas above and below the pump respectively, and suitable collection devices are selected for different oil wells. The collection device on the pump uses a sealing rubber tube to close the oil casing annulus near the wellhead, and the gas enters the tubing through the one-way valve to collect; when the well is flushed, the high-pressure well flushing fluid makes the sealing rubber tube inward, so as to continue downward, pushing the sealing sleeve to close the unit The well flushing fluid cannot enter the oil pipe through the one-way valve to ensure the smooth progress of well flushing; when measuring the dynamic fluid level, pressurize the oil sleeve annulus on the upper part of the sealing rubber cylinder, and the floating valve moves down to open the inner hole of the sealing rubber cylinder , forming a sound wave propagation channel. The collection device for collecting dissolved gas under the pump uses the packer to close the oil jacket annulus under the pump, the gas enters the pump to collect, and the liquid enters the oil jacket annulus through the oil jacket communication valve above the packer to form a dynamic liquid surface. Both sets of collection devices do not affect the daily maintenance of oil wells such as well washing and liquid level measurement.

Description

technical field [0001] The invention relates to a technology for collecting dissolved gas in the production process of crude oil in oil fields, in particular to a downhole collecting device for crude oil dissolved gas. Background technique [0002] Crude oil contains a considerable amount of dissolved natural gas. During the extraction process, these dissolved gas will gradually volatilize in the form of gas to form free gas. Part of this free gas will be pumped out with the well fluid, and the rest will accumulate in the oil casing annulus. A large amount of dissolved gas stored in the casing will oppress the dynamic fluid level of the oil well and have a great impact on crude oil production. The traditional treatment method is to open the casing gate and discharge it into the atmosphere, which not only causes a waste of resources, but also causes serious pollution to the atmosphere. [0003] At present, there are many technologies for collecting crude oil dissolved gas, ...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a crude oil dissolved gas downhole collection device, which solves the problems that the current domestic dissolved gas collection device will reduce the pump efficiency, be easily damaged by human beings, affect the well cleaning operation and measure the dynamic liquid level, etc., without affecting the pumping Under the premise of oil well production and normal maintenance operations, the efficient and safe collection of dissolved gas is realized

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