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An integrated method for CO2 flooding produced gas separation and reinjection

A technology for producing gas and C2-C5, which is applied in chemical instruments and methods, production fluids, earth-moving drilling, etc., can solve the problems that separation and recovery of produced gas cannot be integrated operation, high energy consumption, and high equipment cost. Achieve the effect of fewer steps, improved oil recovery, and simple process

Active Publication Date: 2018-03-16
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of high equipment cost, high energy consumption, and inability to integrate operation of produced gas separation and recovery in the above-mentioned prior art, and to provide a CO 2 Integrated method of produced gas separation and reinjection

Method used

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  • An integrated method for CO2 flooding produced gas separation and reinjection
  • An integrated method for CO2 flooding produced gas separation and reinjection
  • An integrated method for CO2 flooding produced gas separation and reinjection

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Embodiment 1

[0030] a CO 2 The integrated method of flooding production gas separation and reinjection, the specific steps are as follows:

[0031] (1) Produced gas pretreatment, separation of water vapor and C 6 The above heavy hydrocarbon components

[0032] Produced in Well 1 containing CH 4 , N 2 、C 2 -C 5 and C 6 The output gas of the above alkanes is the processing object, which is sequentially transported to the compressor 2 for pressurization through the gas transmission pipeline, the pressurized gas is cooled by the cooler 3, and the cooled fluid enters the gas-liquid separator 4, and in the separator 4 Separation of water vapor and C in the mixture 6 Above heavy hydrocarbons, water vapor and C 6 The above heavy hydrocarbons are discharged through the liquefied material outlet 5 at the bottom of the separator 4;

[0033] (2) Preparation of hydrate flooding agent

[0034] The mixed gas separated in the step (1) is discharged from the top of the separator 4 and passed into...

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Abstract

The invention relates to a CO2 flooding output gas separation and reinjection integrated method and belongs to the technical field of oilfield CO2 flooding oil recovery improving. The method comprises the steps of (1) pretreatment of output gas and separation of steam from more-than- C6 heavy hydrocarbon components; (2) preparation of hydrate oil displacement agents; (3) reinjection of hydrates into reservoir. According to the method, the production of the hydrates through the reaction of CO2 and C2-C5 through a hydrate method, the reaction condition is mild, the generated hydrate size can be re-injected into the reservoir directly, CO2 foam flooding and surface active agent flooding functions are provided, and the oil recovery rate can be improved; the hydrate generation accelerant added into the water solution is a surface active agent and has a high foaming capacity, CO2 and C2-C5 gas can act with the water solution to generate foam, and accordingly, functions of mobility control and oil washing are provided; meanwhile, CO2 flooding displacement crude oil mixed-phase pressure can be reduced by C2-C5, and accordingly, the CO2 flooding recovery rate is improved.

Description

technical field [0001] The present invention relates to a CO 2 The integrated method of flooding production gas separation and reinjection belongs to the oilfield CO 2 Flooding enhanced oil recovery technical field. Background technique [0002] CO 2 Flooding has become the enhanced oil recovery method with the largest oil production in tertiary oil recovery. Daqing, Zhongyuan, Shengli and other oilfields have successively carried out research and application of this technology. In the process of injecting carbon dioxide to achieve oil displacement, although part of the CO 2 It can be stored in the reservoir, but when the injected gas volume reaches a certain level, the CO in the produced gas 2 content will gradually increase. At present, there are two main methods for the treatment of produced gas: the first one is the removal of CO in the produced gas 2 When the concentration is high, the produced gas is directly pressurized and reinjected into the formation; the sec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16C09K8/594
CPCC09K8/594E21B43/16
Inventor 李遵照吴信荣吴莎李晓东赵斌杨昌华万龙陈灿高海涛
Owner CHINA PETROLEUM & CHEM CORP
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