Well head accompanying gas on site recovery purification method

Abstract

The invention relates to a field recovery and purification method for associated gas at a well head, which is used for the field purification and recovery of the associated gas at the well head. The invention solves the problem of difficult recovery of the associated gas at well heads of remote and dispersed oil field, makes full use of energy and reduces environmental pollution. The technical proposal comprises the following steps: inputting the associated gas into a separator to remove tiny solid particles and heavy hydrocarbon emulsion in the associated gas and reclaim condensed oil; then inputting the gas into a gas preheater for heating and reaching the required purification temperature, inputting the gas into a compressor for reaching certain pressure, and inputting the gas into a devulcanizer for removing hydrogen sulfide gas; inputting the devulcanized associated gas into a decarburization tank for removing carbon dioxide; sending the gas into a purification assembly and a deep drain sump for carrying out deep dehydration and carbon dioxide removal through a molecular film; and finally sending the gas into a cold box for decompression and cooling, and preparing the associated gas into liquefied gas which is inputted into a storage tank. The method applicable to oil fields can realize the aims of energy conservation and emission reduction; the method facilitates the skid migration with simple structure and convenient use; and the recovery operation is free of field limitations.

Description

technical field [0001] The invention relates to an on-site recovery and purification method for associated gas at the well head of an oil field, which is used for on-site purification of associated gas at the well head of an oil field to make it reach civil standards and then be recovered. Background technique [0002] my country is rich in associated gas resources of oil wells. According to incomplete statistics, my country is only partly limited by regions, and the associated gas discharged or burned by scattered small oil fields is as high as 1 billion cubic meters per year, which is equivalent to the output of one million tons of oil. With the further development of inland oilfields, a large amount of unrecoverable associated gas resources are wasted. [0003] The usual associated gas recovery method is to transport the associated gas to a special treatment plant through pipelines, after the harmful components in the associated gas are treated, and then further work such...

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Problems solved by technology

[0004] The purpose of the present invention is: in order to solve the problem of difficult recovery of associated gas at the wellhead of remote and scattered oil fields, make full use of non-renewable energy sources, reduce the pollution of the environment caused by the discharge of associated gas or incomplete combustion, and purify the associated gas. Prepare liquefied gas that is easy to transport, and propose a method for on-site recovery and purification of associated gas at the wellhead

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