Method for improving CO2 preservation quantity and crude oil recovery yield

A recovery factor and storage capacity technology, applied in the field of environmental science and technology, petroleum and natural gas science, can solve problems such as thin throats, few pores, and poor connectivity between throats and pores

Active Publication Date: 2018-06-08
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, tight reservoirs have the basic characteristics of few pores, thin throats, and poor connectivity between throats and pores. The development methods and results are mainly affected by the throat radius and the connectivity between throats and pores.

Method used

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  • Method for improving CO2 preservation quantity and crude oil recovery yield
  • Method for improving CO2 preservation quantity and crude oil recovery yield
  • Method for improving CO2 preservation quantity and crude oil recovery yield

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Embodiment Construction

[0049] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0050] Such as figure 1 as shown, figure 1 For improving CO of the present invention 2 Flowchart of the storage and oil recovery method.

[0051] Indoor experiments and field practice show that CO 2 Subsurface storage is mainly achieved by dissolving in formation fluids and occupying pore spaces. CO 2 In the process of oil flooding and storage, the higher the pressure, the higher the CO 2 The more uniform the horizontal and vertical advancement, the more underground crude oil is produced, and the larger the pore space is, the CO 2 The larger the storage capacity. Based on the above knowledge, using the combination of reservoir numerical simulation and indoor physical simulation, the safe and efficient storage can be realized through the op...

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Abstract

The invention provides a method for improving CO2 preservation quantity and crude oil recovery yield. The method comprises the following steps of obtaining relationship curve of pressure level and oildisplacement efficiency according a long slender pipe oil displacement experiment; determining the target region pressure safe limit by using a CO2 oil displacement and target region cover layer andfracture layer preservation stability evaluation method; preferably selecting the reasonable pressure maintaining level by using an oil reservoir value simulation method; realizing the CO2 longitudinal direction balanced displacement according to reservoir parameters, production parameters and process methods; realizing the CO2 plane balanced displacement by using variable-well-pattern well spacing and different reservoir transformation according to the anisotropy and remaining reserve abundance distribution condition of the target region reservoir; regulating the injection mining flow line through the mode optimization of the injection mode, the injection speed, injection mining regulation and control and foam blockage regulation. The invention provides a feasible method for improving theCO2 preservation quantity and the crude oil recovery yield; great application prospects are achieved in aspects of energy saving, emission reduction, CO2 resource utilization and crude oil recovery yield improvement.

Description

technical field [0001] The present invention relates to the fields of environmental science and technology, oil and natural gas science and technology, in particular to a method for improving CO 2 Storage volumes and methods for oil recovery. Background technique [0002] The poor physical properties of tight reservoirs are mainly affected by the microscopic pore structure. The development effect and development methods are greatly affected by the microscopic pore structure. How to characterize the microscopic pore structure characteristics of tight reservoirs is the focus of tight reservoir description. Medium-high permeability reservoirs have thick throats, large and numerous pores, and a high degree of connectivity between throats and pores. The characterization of the microscopic pore structure mainly focuses on the size of the throats. However, tight reservoirs have the basic characteristics of few pores, thin throats, and poor connectivity between throats and pores. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16
CPCE21B43/164Y02P90/70
Inventor 吕广忠杨勇刘显太张东郭迎春曹小朋李志鹏李绍杰刘晓艳李景梅陈辉
Owner CHINA PETROLEUM & CHEM CORP
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