Oil gas well gas injection oil extraction gas production technological process

A process method and technology for oil and gas wells, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of unavailable and mature gas injection technology, and achieve convenient and flexible equipment, enhanced recovery, and operation The effect of low cost

Inactive Publication Date: 2008-09-17
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

For deep oil and gas reservoirs above 5000m that are difficult to exploit, gas injection EOR technology needs to inject high-pressure gas downhole, the pressure must reach 50-100MPa, and it is difficult for a single gas compressor to meet the requirements. Mature Technology of Gas Injection in Oil and Gas Fields

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  • Oil gas well gas injection oil extraction gas production technological process

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Embodiment Construction

[0011] The implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0012] As shown in the accompanying drawings, the process method of gas injection oil recovery and gas recovery of the present invention is: after the injection gas is filled with the cylinder 3 through the intake valve 6, water is pressed into the cylinder 3 by the high-pressure water pump 2 (at this time, the valves 10, 11, 14, 17 open, valves 12, 15, and 16 are closed), along with the high-pressure water continuously compressing the gas in the cylinder 3, when the gas pressure is higher than the intake pressure, the one-way valve 6 is closed, and the high-pressure air opens the one-way outlet valve 7 through the valve 14 , The wellhead device 5 enters the oil and gas well. After all the gas in the cylinder 3 is pressed into the oil and gas well, the valves 13, 12, 16, and 15 are opened, and the high-pressure water in the cylinder 3 is pressed i...

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Abstract

The invention relates to an oil-gas well injection, oil extraction and gas production technological method used for improving oil-gas recovery rate in an oil-gas field, which uses a centrifugal hydraulic gas compressibility technology and high pressure gas is injected into different oil-gas resources to improve the oil-gas production. The technological method has a technical proposal that the injected gas is injected into the cylinder by a gas inlet valve; when opening a high pressure water pump, the water in the water tank is pressed into the cylinder, and with the decrease of the gas space in the cylinder the gas pressure increases; when the gas pressure in the cylinder is higher than the injection pressure, the gas inlet valve closes; when the gas pressure in the cylinder is higher than the gas pressure in the oil-gas well, the gas outlet valve opens and the injected gas is injected into the well by a wellhead device; when the water outlet valve at the bottom of the cylinder is opened, water is pressed into another cylinder; the gas inlet valve of the front cylinder automatically opens for inspiration; the gas in the back cylinder is compressed; and the pressure is thus increased; when the pressure is higher than the pressure in the well, the gas is pressed into the oil-gas well, and consequently the injection is realized by repeating the process. The technological method has the advantages of simple technological process and low operation cost, which can be used for oil and gas production in oil-gas wells and can increase the recovery rate of oil-gas fields.

Description

technical field [0001] The invention relates to a process method for gas injection and recovery of oil and gas wells used in oil and gas fields to increase the recovery rate of oil and gas. Background technique [0002] Gas injection enhanced oil recovery technology, due to its low cost and wide range of gas sources, has become the focus and hotspot of enhanced oil and gas recovery research, and has been widely used in oil and gas fields. At present, the gas injected to enhance the recovery of oil and gas fields includes natural gas, N 2 , flue gas and air. [0003] At present, for shallow oil and gas reservoirs below 5000m, the injection gas pressure is low, and the gas injection production technology is relatively easy to apply. Gas compressors are widely used as the main equipment of the gas injection process, and the technology is relatively mature. However, there are problems such as unstable gas compressor, easy damage, high operation and maintenance costs. At prese...

Claims

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Application Information

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IPC IPC(8): E21B43/18
Inventor 唐晓东孟科全崔盈贤王治红卿大咏陈广明
Owner SOUTHWEST PETROLEUM UNIV
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