Oilfield associated gas comprehensive utilization method

A technology for oilfield associated gas and condensate oil, which is applied in the petroleum industry, gas fuel, liquid hydrocarbon mixture recovery, etc. It can solve the problems of difficult transportation, low concentration, and inability to use Claus process sulfur treatment, etc., to achieve diversification , to achieve the effect of comprehensive utilization of resources
CN111004657AActive Publication Date: 2020-04-14CHINA TIANCHEN ENG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA TIANCHEN ENG
Publication Date
2020-04-14

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Abstract

The invention provides an oilfield associated gas comprehensive utilization method, which comprises three sections of condensate oil preparation, hydrocarbon separation and product extraction, and adopts a step-by-step pressurizing liquefaction product separation and step-by-step drying dehydration method for oilfield associated gas. According to step-by-step pressurizing liquefaction, componentsabove C2 can be separated by first -stage pressurization, CO2 and methane are separated through two-stage pressurization, and liquefied methane gas is subjected to three-stage pressurization to produce an LNG product. And step-by-step drying dehydration is conducted, after most C5 and components above C5 are separated from the associated gas coming from an inlet gathering and transportation pipeline through pressurization dehydration, the associated gas is subjected to first-stage dehydration drying to the dew point of -100 DEG C, the C2, components above C2 and CO2 are separated out, and finally natural gas liquefaction is conducted after the associated gas is subjected to third-stage dehydration drying to the dew point of -180 DEG C. The process energy consumption is reduced to the maximum extent, product diversification can be achieved, product transportation is not limited by surrounding conditions of an oil field, high environmental protection benefits and economic benefits are achieved, and comprehensive and efficient utilization of the oil field associated gas is achieved.
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Description

technical field

[0001] The invention belongs to the technical field of oilfield gas recovery and separation, and in particular relates to a comprehensive utilization method of oilfield associated gas. Background technique

[0002] Oilfield associated gas, also known as oilfield gas, is a gas that escapes from oil wells. Its main components are low molecular alkanes such as methane (C1) and ethane (C2), and a certain amount of propane (C3), butane alkanes (C4) and pentanes (C5) and above heavy components (C5+), and acid gases such as H 2 S and CO 2 , the acid gas concentration varies in different oilfields.

[0003] Such as figure 1 As shown, the typical route of the existing oilfield associated gas recovery technology can be summarized as follows: the wellhead associated gas enters the pressurization unit after pretreatment to remove sand and water; the condensate produced during the pressurization process enters the heavy hydrocarbon stabilization unit, and the produced ...

Claims

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