Horizontal well profile control effect evaluation method based on fuzzy comprehensive evaluation and analytic hierarchy process

Abstract

The invention discloses a horizontal well profile control effect evaluation method based on fuzzy comprehensive evaluation and analytic hierarchy process, and belongs to the field of horizontal well water shutoff and profile control. Injection pressure, a water absorption index, a Hall curve slope, a water well profile control variable coefficient and a water absorption profile homogeneity coefficient are selected as a factor set of horizontal well water shutoff and profile control effect evaluation indexes, and the evaluation results are divided into four grades of good effectiveness, relatively good effectiveness, general effectiveness and no effectiveness to form a comment set. The method also includes calculating the membership degree of each factor in the factor set to the evaluation result according to the membership function, and constructing an evaluation matrix; analyzing the weight occupied by each factor in the judgment result by using an analytic hierarchy process to obtain a weight set; and based on a weighted average model, obtaining a membership degree of the evaluation result to the evaluation grade, and determining a final comprehensive evaluation grade according to a maximum membership degree principle. The invention solves the problems that an existing horizontal well water shutoff and profile control evaluation method is diversified in result and poor in comprehensiveness.

Description

technical field [0001] The invention belongs to the field of water plugging and profile control of horizontal wells, and relates to a method for evaluating the effect of profile control of horizontal wells based on fuzzy comprehensive evaluation and hierarchical analysis. Background technique [0002] The chemical water plugging and profile control technology is an important means to improve the heterogeneity of the reservoir, improve the sweep efficiency of injected water, thereby enhancing the water injection development effect of the oilfield and improving the oil recovery rate of the oilfield. However, at present, the effectiveness of chemical water plugging and profile control in horizontal wells is generally judged based on experience, or only rely on a certain index such as injected water distribution ratio or water absorption index for analysis and evaluation. The comparative changes before and after chemical water plugging and profile control in Hira wells are relat...

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Problems solved by technology

However, the evaluation of the effect of water plugging and profile control of horizontal wells in current oilfields rarely combines fuzzy comprehensive evaluation and analytic hierarchy process, and no corresponding evaluation process and evaluation standards have been formed.

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