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Method for evaluating construction effect of remedial operation in underground workover operation

An evaluation method and technology in operation, which is applied in the direction of wellbore/well components, earthwork drilling and production, complex mathematical operations, etc., can solve problems such as increased difficulty of operation measures, coexistence of multiple evaluation methods, and poor efficiency, so as to avoid Effects of overhaul and complex operations, improvement of measure operation quality, and improvement of workover operation quality

Active Publication Date: 2018-12-25
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is that the difficulty of operation measures increases, the increase in oil production decreases, and the benefits become worse
Generally speaking, there are mainly the following three problems: 1. The coexistence of multiple evaluation methods
2. Various evaluation methods are often only carried out for a single technical operation, and a unified evaluation system suitable for downhole operations has not yet been formed
3. The selection and processing methods of the evaluation index items of each evaluation method still need to be improved

Method used

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  • Method for evaluating construction effect of remedial operation in underground workover operation
  • Method for evaluating construction effect of remedial operation in underground workover operation
  • Method for evaluating construction effect of remedial operation in underground workover operation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A method for evaluating the construction effect of measure operations in downhole workover operations, comprising the following steps:

[0049] (a) Determine the evaluation index set U of the measure operation, U={oil increment u 1 , validity period u 2 , effective u 3 , construction period u 4 , Injection amount u 5 , water injection pressure u 6};

[0050] (b) Determine the evaluation set V of the job effect, V={good v 1 , better v 2 , generally v 3 , poorer v 4 , difference v 5};

[0051] (c) Determine the weight W of each evaluation index;

[0052] (d) Given the evaluation matrix R=(R 1 , R 2 , R 3 , R 4 , R 5 , R 6 ) T , R i =(r i1 ,r i2 ,r i3 ,r i4 ,r i5 ), where the element R i =U i ×W i , i=1,2,…,6, where U i For each evaluation index in the index set U, W i is the weight corresponding to the evaluation index, element r ij is the possibility degree of the j-th evaluation of the i-th evaluation index;

[0053] (e) Establish a fuzzy ...

Embodiment 2

[0056] A method for evaluating the construction effect of measure operations in downhole workover operations, characterized in that it comprises the following steps:

[0057] (a) Determine the evaluation index set U of the measure operation, U={oil increment u 1 , validity period u 2 , effective u 3 , construction period u 4 , Injection amount u 5 , water injection pressure u 6}; Standardize the data of each index in the index set U by the range normalization method:

[0058] (1) There are s evaluation blocks, based on 6 evaluation indicators, an index data matrix Y=(y ij ) s×6 ;

[0059] (2) When the jth index is a very large index, that is, the index value y ij When the bigger the better, the conversion formula is:

[0060]

[0061] When the jth index is a very small index, that is, the index value y ij When the smaller the better, the transformation formula is:

[0062]

[0063] (3) by the two conversion formulas, the index data matrix Y is converted into a...

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Abstract

The invention discloses a method for evaluating the construction effect of remedial operation in underground workover operation. The method comprises the steps that (a) an evaluating index set U of the remedial operation is determined; an evaluating set V of the operation effect is determined; the weight W of each evaluating index is determined; evaluation matrixes R and Ri are given, wherein R= (R1, R2, R3, R4, R5, R6T), and Ri= (ri1, ri2, ri3, ri4, ri5); a fuzzy evaluation model is established; an evaluating index value B is calculated and normalized; and according to a maximum subordinationprinciple, a comprehensive evaluation result is obtained. The purpose of the invention is to provide a method for evaluating the construction effect of the remedial operation in the underground workover operation to overcome the above defects of an evaluation method of the remedial underground operation in the prior art, improve the workover operation quality, prolong the maintenance-free periodof an oil-water well, timely know and grasp the workover operation effect and influencing factors, improve the quality of the remedial operation, thereby achieving the purpose of trying to avoid unnecessary overhaul and complex operation.

Description

technical field [0001] The invention relates to the field of well workover, in particular to a method for evaluating construction effects of measure operations in downhole workover operations. Background technique [0002] Downhole operation is a general term for all kinds of construction procedures such as the commissioning of oil and water wells, production maintenance, troubleshooting in wells, increasing and stabilizing production, etc. It is an important guarantee for the long-term and efficient operation of oil, gas and water wells. After years of exploitation and development, the oil production of most oilfields is currently showing a downward trend. The problems faced by various oil production plants are high water content in liquid production, complex well conditions of oil and water wells, difficult construction of some oil wells, and long time for oil well operations , resulting in an increase in lost time, which greatly affects the crude oil production process in...

Claims

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Application Information

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IPC IPC(8): E21B49/00G06F17/50G06F17/10G06Q10/06
CPCE21B49/00G06F17/10G06Q10/06393G06F30/20
Inventor 胡义升秦松海刘志斌闵超董晓旭陈琳马南南
Owner SOUTHWEST PETROLEUM UNIV
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