Method for evaluating reproduction potential of tight gas reservoir watered gas well

Abstract

The invention belongs to the gas field exploitation research field, and especially relates to a method for evaluating reproduction potential of a tight gas reservoir watered gas well. The method includes the following steps: determining a reproduction goal of a tight gas reservoir watered gas well on the basis of the geological and exploitation features of the gas well; utilizing a hierarchy analysis method to establish a hierarchical structure model for different reproduction potential evaluations of the watered gas well; through the hierarchical structure model, constructing a judging matrix and determining weights of all evaluation factors; and utilizing a fuzzy mathematics comprehensive evaluation method to make remark and grading standards for all indexes, and establishing a target gas well comprehensive evaluation transformation matrix. A fuzzy mathematics comprehensive evaluation calculating model for a target gas well is determined on the basis of the weights of the indexes and the target gas well comprehensive evaluation transformation matrix, so that reproduction potential comprehensive evaluation values of the watered gas well are obtained and an optimal reproduction sequence of the gas well is determined. The method of the invention enables degrees of the advantages and disadvantages of the evaluation factors and comprehensive evaluation of reproduction potential of the watered gas well to be obtained, and is a scientific and effective method for reproduction of the tight gas reservoir watered gas well.

Description

technical field [0001] The invention relates to the field of gas field development and research, in particular to an evaluation method for the recovery potential of water-flooded gas wells in tight gas reservoirs. Background technique [0002] With the depletion of conventional oil and gas resources, the development of unconventional oil and gas represented by tight gas has gradually become the key direction of oil and gas industry development. Different from conventional gas reservoirs, tight gas reservoirs have poor physical properties and extremely low permeability, so the gas production of single wells is generally low, and often require fracturing and other means to achieve profitable development. At the same time, tight gas reservoirs have small pore throats and high tortuosity, poor hydrocarbon generation capacity, low displacement pressure, original formation water cannot be effectively removed during the accumulation stage, gas-water coexistence is common, and gas w...

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Problems solved by technology

[0005] The present invention provides an evaluation method for the reproduction potential of water-flooded gas wells in tight gas reservoirs, objectively provides a method for selecting water-flooded gas wells for reproduction, and solves the problem of low success rate of reproduction due to the lack of objective basis and only empirical judgment. technical issues

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