Method for describing the heterogeneity of carbon dioxide drive reservoir layer

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...

Examples

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. ...

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...

Examples

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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