Single-screw pump low-pressure natural gas or coal-bed gas pressurizing system and method

Abstract

The invention discloses a single-screw pump low-pressure natural gas or coal-bed gas pressurizing system and method, and relates to the technical field of oil and natural gas. The single-screw pump low-pressure natural gas or coal-bed gas pressurizing system and method do not need to conduct early-stage separation treatment on natural gas or coal-bed gas containing water and condensate oil. According to the adopted technical scheme, the low-pressure natural gas or coal-bed gas containing the water and the condensate oil is mixed with combined transportation lubrication pressurizing fluid in aspraying and absorbing mode, then pressurization is conducted through a single-screw pump till the pressure reaches at least 3 MPa, the single-screw pump changes the direction to enter a separation storage tank to conduct cyclone separation, gas obtained through separation is input into a gas network, and mixed fluid which is obtained through separation and contains the combined transportation lubrication pressurizing fluid or newly supplemented combined transportation lubrication pressurizing fluid is mixed with the low-pressure natural gas or coal-bed gas containing the water and the condensate oil in a spraying and absorbing mode through a lubrication pump. According to the single-screw pump low-pressure natural gas or coal-bed gas pressurizing system, the structure is compact, operation is reliable, the service life is long, and the operation cost is low; and the method does not need to conduct early-stage separation treatment on the natural gas or coal-bed gas containing the waterand the condensate oil, and hybrid pressurization is achieved.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas, in particular to a single-screw pump low-pressure natural gas or coal bed gas pressurization system and method. Background technique [0002] Natural gas or coalbed methane is extracted from the ground, and as it is continuously extracted, the pressure of the natural gas or coalbed methane will decrease. When the pressure is lower than 0.3MPa, it is necessary to pressurize the natural gas or coalbed methane at the wellhead so that the produced natural gas or coalbed methane has enough power to be transported to the gathering station. At present, natural gas compressor units are usually used to pressurize natural gas. However, since the produced natural gas contains water and condensate oil, a device for separating and treating water and condensate oil needs to be matched with the natural gas compressor. Natural gas booster equipment is bulky, and the cost of booster operation i...

AI Technical Summary

Problems solved by technology

At present, natural gas compressor units are usually used to pressurize natural gas. However, since the produced natural gas contains water and condensate oil, a device for separating and treating water and condensate oil needs to be matched with the natural gas compressor. Natural gas booster equipment is bulky, and the cost of booster operation is high

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