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A co 2 Purification and liquefaction process of flooding production gas re-injection

A gas production and process technology, applied in wellbore/well components, production fluids, earth-moving drilling, etc., can solve the problems of high operating energy consumption and high initial investment, and achieve the effect of recycling and saving energy

Inactive Publication Date: 2021-01-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0008] In order to overcome the existing oilfield CO 2 Flooding production and gas separation methods have defects such as high initial investment and high energy consumption in operation. The present invention aims at CO 2 In the case of flooding liquid injection, combined with the produced gas separation and liquefaction reinjection process, a produced gas separation and reinjection method is designed. This method can not only meet the requirements of gas separation and purification, but also achieve the purpose of energy efficient utilization

Method used

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  • A co <sub>2</sub> Purification and liquefaction process of flooding production gas re-injection

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] (1) Oilfield CO 2 The gas produced by flooding undergoes pretreatment modules such as solid removal, oil removal, and dehydration to deeply remove tiny solid particles and water therein, and is detected by a water dew point detector (12) to meet the requirements of subsequent processing.

[0038] (2) Pressurize the pretreated output gas with a compressor (13), and use an air cooler (14) and a gas-liquid separator (15) to cool and dehydrate the output gas.

[0039] (3) The treated high-pressure gas passes through the heat exchanger (7) and the liquid CO injected into the oil field 2 Fully heat exchange, so that the CO in the output gas 2 liquefaction. At the same time, the liquid is separated by the gas-liquid separator (6), and the gas is transported outside through the pipeline, because the CH in the gas 4 The content is relatively high, and the combustion ...

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Abstract

The invention relates to the field of exploration and development of petroleum and gas, and provides a technique for purifying, liquefying and re-injecting oilfield CO2 flooding produced gas. According to the technical point, a method of supercharging by a multi-stage compressor and cooling by five-stage heat exchange is adopted, and the purpose of separating and liquefying the produced gas is achieved. The technique comprises the following process steps: supercharging the pretreated oilfield CO2 flooding produced gas by using a multi-stage compressor unit so as to reduce liquefying temperature of gas; and liquefying CO2 in a five-stage heat exchange cooling mode while the produced gas is separated. The technique has the advantages that for the high-CO2-content produced gas, the liquefying temperature of the gas can be reduced gradually along with rising of pressure in a certain range; and under the same pressure, the liquefying temperature of CO2 is higher than that of CH4 and N2. By the technique, while the produced gas is separated, purified and liquefied, injected liquid CO2 can be heated, energy is saved, and engineering cost is reduced.

Description

[0001] Technical field [0002] The invention relates to the field of oil and gas exploration and development, in particular to an oil field CO 2 A technological method for purifying and liquefying produced gas from flooding for re-injection. Background technique [0003] With CO 2 Continuous development of capture technology and CO 2 The superiority of flooding in the development of medium and low permeability reservoirs, CO 2 -EOR production is increasing year by year, and has gradually become an important way to improve oil and gas field recovery. According to incomplete statistics, the CO currently being implemented around the world 2 There are more than 120 oil flooding projects, and the United States, Canada and other countries have carried out a lot of research on CO injection 2 Research work on enhanced oil recovery, relatively well-known CCS and CO 2 -EOR projects include Canada's Weyburn Oilfield, North Sea Sleipner Project, Algeria's In Salah Project, etc., wh...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/40E21B43/16
CPCE21B43/164E21B43/168E21B43/40
Inventor 张亮马鹏飞李德祥韩波黄峰李欣任韶然
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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