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Method for describing the heterogeneity of carbon dioxide drive reservoir layer

A technology of reservoir heterogeneity and carbon dioxide, applied in the theoretical research of reservoir numerical simulation, technology application and oil and gas field development to improve oil recovery, can solve the problems of lack of targeted description and accelerate gas propulsion speed, eliminating the effect of reducing the gas propulsion speed

Active Publication Date: 2018-04-06
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

At present, domestic and foreign researchers lack targeted descriptions for the analysis, comparison and optimization of gas drive propulsion speed

Method used

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  • Method for describing the heterogeneity of carbon dioxide drive reservoir layer
  • Method for describing the heterogeneity of carbon dioxide drive reservoir layer
  • Method for describing the heterogeneity of carbon dioxide drive reservoir layer

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Embodiment Construction

[0021] In order to make the above-mentioned features and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below, and are described in detail in conjunction with the accompanying drawings.

[0022] Such as figure 1 as shown, figure 1 It is a flow chart of the construction method describing carbon dioxide flooding reservoir heterogeneity of the present invention.

[0023] In step 101, the interval distribution characteristic probability analysis is performed on the single well logging interpretation results of the target layer in a certain research area, and the permeability gradient of the block is calculated.

[0024] In step 102, use the conceptual model to analyze the influence factors of the permeability difference of the reservoir on the gas breakthrough time and recovery degree, and establish the correlation between the vertical permeability difference and the gas breakthrough time and recovery degree. ...

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Abstract

The present invention provides a method for describing the heterogeneity of a carbon dioxide drive reservoir layer. The method comprises: Step 1, calculating the permeability difference of blocks, anddetermining a reasonable permeability differential limit according to the permeability difference of study areas; Step 2, processing a permeability interpretation result in a certain study area and calculating the permeability difference of a grid model; Step 3, using a numerical simulation means to study the influence of different methods on the carbon dioxide drive gas breakthrough time; Step 4, analyzing the influence of physical and chemical properties of crude oil in the carbon dioxide drive on the ratio of gas to oil; Step 5, using the numerical simulation means to analyze the flow difference of different permeability value models; and Step 6, using the ratio of gas to oil in the actual model to fit, compare and correct the average permeability value. By virtue of the construction method provided by the present invention, according to the parameters that can be provided in the numerical simulation, a method for discretizing the permeability curve is established, and a numericalsimulation basis is provided for the improvement of the numerical simulation accuracy of the carbon dioxide drive and the quantitative characterization of the displacement mechanism thereof.

Description

technical field [0001] The invention relates to the field of reservoir numerical simulation theory research, technical application and oil and gas field development to enhance oil recovery, in particular to a construction method for describing the heterogeneity of carbon dioxide flooding reservoirs. Background technique [0002] With the deepening of Sinopec's green environmental protection concept, carbon dioxide flooding technology represents the frontier direction of tertiary oil recovery. The market demand is large and the economic benefits are significant. It can not only improve oil recovery but also reduce carbon dioxide emissions. Low-permeability reservoirs have difficulty in water injection development, poor water flooding effect and low recovery factor. The ultra-low permeability reservoirs of less than 5 mD in Shengli Oilfield cannot be developed by water flooding, and carbon dioxide flooding has great advantages. The advantages of carbon dioxide flooding are th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06Q50/02E21B43/16
CPCE21B43/16G06Q50/02G06F30/20Y02A10/40
Inventor 王杰戴涛于金彪谭保国赵莹莹史华宋勇宋桂茹张波汪勇陈燕虎易红霞苏海波
Owner CHINA PETROLEUM & CHEM CORP
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