A Quantitative Division Method of Carbon Dioxide Flooding Gas Injection Stages

A carbon dioxide, stage technology, applied in earthwork drilling, wellbore/well components, production fluid, etc., can solve the hysteresis of gas injection stage division, affect the gas drive rate, and the pertinence and timeliness of gas channeling prevention and control measures Insufficiency and other problems, to improve the development effect, improve the utilization rate, and achieve the effect of differentiated management

Active Publication Date: 2022-04-26
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

At present, the division of gas injection stages is usually statistically obtained in the late stage of gas injection according to the relationship between the production performance of oil wells in the reservoir and the gas production volume. As a result, the division of gas injection stages has a certain hysteresis, and the advance planning of gas injection stages cannot be realized, resulting in gas channeling. The pertinence and timeliness of prevention and control measures are insufficient, which affects key indicators such as gas exchange rate related to gas flooding enhanced recovery

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  • A Quantitative Division Method of Carbon Dioxide Flooding Gas Injection Stages
  • A Quantitative Division Method of Carbon Dioxide Flooding Gas Injection Stages
  • A Quantitative Division Method of Carbon Dioxide Flooding Gas Injection Stages

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] refer to figure 1 , the method for quantitatively dividing the carbon dioxide flooding and gas injection stages of the present invention is a method for quantitatively dividing the carbon dioxide flooding and gas injection stages that comprehensively considers the dual indicators of technology and economy, and includes the following steps:

[0040] Step 1: Determine the gas-oil ratio corresponding to the boundary line of the dissolved gas front according to the maximum gas-oil ratio of the oil well before carbon dioxide flooding;

[0041] Step 2. Considering the technical dimension, on the basis of obtaining formation crude oil components and basic physical properties, use high-pressure fluid phase state simulation method to calculate the dissolved gas-oil ratio of carbon dioxide in formation crude oil at different reservoir temperatures and pressures. Determ...

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Abstract

The invention discloses a method for quantitatively dividing gas injection stages of carbon dioxide flooding. The gas-oil ratio corresponding to the edge; calculate the economic limit gas-oil ratio according to the oil production of a single well in the block, oil price and carbon dioxide price, and use the economic limit gas-oil ratio to determine the gas-oil ratio corresponding to the marginal front; the gas-oil ratio corresponding to the actual oil well production The gas-oil ratio corresponding to the boundary line of the dissolved gas front, the gas-oil ratio corresponding to the free gas front, and the gas-oil ratio corresponding to the marginal front were used to divide the carbon dioxide flooding and gas injection stages. The invention can obtain the division of gas injection stages for carbon dioxide flooding in the oil reservoir before gas injection, realizes the division of gas injection stages, and improves the pertinence and timeliness of gas channeling prevention and control measures.

Description

technical field [0001] The invention relates to the technical field of gas drive enhanced oil recovery in oil and gas field development, in particular to a quantitative division method of carbon dioxide drive and gas injection stages. Background technique [0002] As an effective method for the resource utilization of greenhouse gases, carbon dioxide flooding enhanced oil recovery technology has received increasing attention. This technology has a good application prospect in the development of low permeability and ultra-low permeability reservoirs. The division of gas injection stages is one of the key bases for gas-driven state adjustment. At present, the division of gas injection stages is usually statistically obtained in the late stage of gas injection according to the relationship between the production performance of oil wells in the reservoir and the gas production volume. As a result, the division of gas injection stages has a certain lag, and it is impossible to re...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16E21B49/00
CPCE21B43/164E21B49/00
Inventor 湛杰马先林杨昌华李蒙蒙牛智浩苏泽中林加恩
Owner XI'AN PETROLEUM UNIVERSITY
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