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A Method for Evaluating Construction Effect of Measure Operation in Downhole Workover Operation
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An evaluation method and technology in operation, applied in wellbore/well components, earthwork drilling, instruments, etc., can solve the problems of poor efficiency, no unified measure downhole operation evaluation system, coexistence of multiple evaluation methods, etc.
Active Publication Date: 2021-09-14
SOUTHWEST PETROLEUM UNIV
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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
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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 conversion formula is:
[0062]
[0063] (3) By the two conversion formulas, the index data matrix Y is converted into a dec...
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Abstract
The invention discloses a method for evaluating construction effects of measure operations in downhole workover operations: (a) determining the evaluation index set U of measure operations; determining the evaluation set V of operation effects; determining the weight W of each evaluation index; giving 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 ); establish a fuzzy evaluation model; calculate the evaluation index value B and normalize it; obtain the comprehensive evaluation result according to the principle of maximum membership. The purpose of the present invention is to provide a method for evaluating the construction effect of measure operations in downhole workover operations, so as to solve the above-mentioned defects in the evaluation methods for measure downhole operations in the prior art, improve the quality of workover operations, and prolong the maintenance-free period of oil and water wells. In order to keep abreast of the effects of workover operations and their influencing factors in a timely manner, the purpose of improving the quality of workover operations is to avoid unnecessary overhaul and complex operations as much as possible.
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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