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Drainage gas production effect fuzzy comprehensive evaluation method based on entropy evaluation method

A fuzzy comprehensive evaluation, drainage and gas recovery technology, applied in special data processing applications, complex mathematical operations, design optimization/simulation, etc., can solve the problems of no evaluation system, no comparison and evaluation of foam drainage effects, etc., and achieve accurate and objective evaluation Information, avoiding the interference of human subjective factors, and the effect of simplifying complex problems

Pending Publication Date: 2020-11-10
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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Problems solved by technology

[0003] However, there are many factors that affect the effect of foam drainage gas recovery technology, which leads to the lack of a complete and generally industry-recognized evaluation system in the field of foam drainage gas recovery, and it is impossible to compare and evaluate the foam drainage effects of water-producing gas wells in different gas fields. , so based on the needs of production technology management in the field of gas production in gas wells, this paper proposes a comprehensive evaluation method for drainage and gas production based on entropy method and fuzzy comprehensive evaluation

Method used

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  • Drainage gas production effect fuzzy comprehensive evaluation method based on entropy evaluation method
  • Drainage gas production effect fuzzy comprehensive evaluation method based on entropy evaluation method
  • Drainage gas production effect fuzzy comprehensive evaluation method based on entropy evaluation method

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Comparison scheme
Effect test

Embodiment 1

[0041] as attached figure 1 As shown, a fuzzy comprehensive evaluation method for drainage and gas recovery effect based on entropy value method includes the following steps:

[0042] Step 1, according to the characteristics of the foam drainage gas recovery well, select the evaluation index for evaluating the foam drainage gas recovery effect;

[0043] Step 2, follow the principle of combining qualitative and quantitative, construct the evaluation index system of foam drainage and gas recovery effect:

[0044] Corresponding to the relationship between the comprehensive evaluation index and the evaluation level, set m value intervals v j , j=1, 2,..., m; thus determine the evaluation set V={v 1 ,v 2 ,v 3 ,...v m};

[0045] Step 3: Considering the relationship between the evaluation indicators of gas well drainage and gas recovery effect, the linear analysis method is used to establish the membership degree matrix, and the fuzzy relationship matrix R is obtained:

[0046...

Embodiment 2

[0053] refer to figure 1 As shown in the flow chart of the method, the process of the fuzzy comprehensive evaluation method for drainage and gas recovery effect based on the entropy method is as follows:

[0054] Step 1. Determine the evaluation index of drainage and gas recovery. Through the analysis of various factors affecting the effect and benefit of foam drainage and gas recovery, select four important indicators that affect the effect of drainage and gas recovery: daily gas production change rate (Δq g ), daily water production change rate (Δq w ), the rate of change of pressure difference between casing and casing (ΔP), and the cost of daily foam drainage and gas production (ΔC) are used as evaluation indicators. These four evaluation indicators are composed of fuzzy set U, and this fuzzy set is used as the evaluation target of drainage and gas recovery effect. The expression of U is as follows:

[0055] U={u 1 ,u 2 ,u 3 ,u 4}={Δq g ,Δq w ,ΔP,ΔC}.

[0056] ...

Embodiment 3

[0112] Utilize the method for embodiment 2 to carry out the foam drainage effect evaluation to the gas well of a certain area of ​​China Southwest oil and gas field, this well begins to carry out foam drainage gas recovery technology from April 18, 2012, and until August 22, 2012, the number of days of implementing the technology is 126 days, so the nearly equal number of unsoaked row days yesterday was selected for comparison, and the time was from December 1, 2011 to April 17, 2012. During the process of on-site process implementation, the dosage and period of the foaming agent are constantly adjusted according to the on-site data.

[0113] Process the data before and after the foam drainage and gas recovery operation through Python, realize data visualization with the matplotlib tool library, and make an attached figure 2 Comparison chart of gas production before and after foam drainage gas recovery operation, attached image 3 Comparison chart of water production before ...

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Abstract

The invention discloses a drainage gas recovery effect fuzzy comprehensive evaluation method based on an entropy evaluation method, aiming at the characteristics of a foam drainage gas recovery well,indexes for evaluating the foam drainage gas recovery effect are selected, and a foam drainage gas recovery effect evaluation index system is constructed by following the principle of combining qualitative analysis and quantitative analysis. The mutual relationship between the evaluation indexes of the gas well drainage gas recovery effect is considered, a membership matrix is created by adoptinga linear analysis method, the index weight is confirmed by adopting an entropy evaluation method, and the comprehensive evaluation index of the gas well foam drainage gas recovery effect is calculatedby combining a fuzzy comprehensive evaluation method. by using the method provided by the invention, more scientific, accurate and objective evaluation information can be obtained.

Description

technical field [0001] The invention relates to the technical field of drainage gas recovery effect evaluation, in particular to a fuzzy comprehensive evaluation method for drainage gas recovery effect based on an entropy value method. Background technique [0002] Drainage gas recovery is an important measure to improve production efficiency in the production process of gas wells, which solves excessive liquid accumulation or water production in the wellbore and near the bottom of the gas well, and restores the normal production of the gas well. Because of the advantages of simple equipment, easy construction, quick effect, low cost, and no impact on gas well production, foam drainage gas recovery has been widely used in global drainage gas recovery operations. Therefore, it is important to systematically evaluate the foam drainage gas recovery effect. Particularly important. [0003] However, there are many factors that affect the effect of foam drainage gas recovery tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/16G06F30/20
CPCG06F17/16G06F30/20
Inventor 杜敬国李泽坤李嘉林
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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