A kind of heavy oil reservoir with edge and bottom water 2 Well Selection Method for Throughput

A technology for edge and bottom water reservoirs and well selection, applied in data processing applications, instruments, calculations, etc., can solve problems such as large influence of human factors, too many influencing factors, and increased complexity of well selection

CN106920173BActive Publication Date: 2020-06-12CHINA UNIV OF PETROLEUM (BEIJING)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-06-12

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Abstract

The invention provides a well section method for multi-turn CO2 huff and puff of a viscous oil edge and bottom water reservoir. The well selection method includes the following steps: using a hull and puff oil gain amount as an evaluation index, determining a geological factor, a fluidity factor and a development factor of an oil well; imparting weight to each factor, and correcting the weight of each factor by conducting numerical value dedoublement; using a single-factor sequencing method to acquire a single-sequence matrix; on the basis of respective corrected weight of each factor and the single-sequence matrix, acquiring an overall sequence, obtaining the evidence for well selection. According to the invention, the method herein can overcome man-made interference brought by incomprehensive on-site material and uncertainty of the result from the well selection caused by difficulty of representing continuation-type variant factors, has actual significance for well selection for multi-turn CO2 huff and puff of a viscous oil edge and bottom water reservoir, and is efficient, reasonable and scientific.
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Description

technical field

[0001] The invention relates to a well selection method, in particular to a multi-round CO 2 The well selection method of huff and puff belongs to the technical field of petroleum exploitation. Background technique

[0002] In the development process of heavy oil reservoirs with edge and bottom water, the water cut rises rapidly due to the high oil-water mobility ratio, and the degree of crude oil recovery is low. Production practice proves that CO 2 Huff and puff has good functions of water control, viscosity reduction and production increase. Affected by comprehensive factors such as geology, fluids, and development, CO 2 The throughput decision requires a scientific and effective well selection method.

[0003] Conventional well selection methods mainly adopt hierarchical analysis or weight analysis, and these methods have certain application limitations. On the one hand, relying on subjective experience to establish a judgment matrix is ​​greatly aff...

Examples

Embodiment 1

[0126] This embodiment provides a heavy oil side bottom water reservoir with multiple rounds of CO 2 Throughput well selection methods, such as figure 1 As shown, the method includes:

[0127] Step S11, taking throughput oil increase as evaluation index, screening 2 Geological, fluid and development factors of throughput effect;

[0128] Step S12, assigning weights to each factor, and correcting the weights of each factor through numerical splitting;

[0129] Step S13, using the factor single ranking method provided to calculate the single ranking matrix;

[0130] In step S14, the total ranking is calculated according to the weight of each factor and the single ranking matrix, and the basis for well selection is obtained.

[0131] This embodiment provides a well selection calculation method. This method first implements the weight correction for incomplete data through the numerical split method; secondly, with the help of reservoir numerical simulation technology, realiz...