In the middle and late stages of development of the Moxi Gas Field in central Sichuan,there is an urgent need for gas wells to restore and enhance production,and consequently an evaluation method for the effectiveness of gas production engineering measures is required.To solve this problem,an evaluation method for gas production engineering measures in the Moxi Gas Field was established,enabling comprehensive quantitative evaluation of the implementation effect of such measures.This method selects the increase in maximum wellhead deliverability,the proportion of cumulative incremental gas production,the proportion of cumulative incremental water production,and the effective period of the engineering measure before and after implementation as quantitative evaluation indices,and determines the weight of each index.The fuzzy analytic hierarchy process was used to integrate multiple categories of evaluation indices into a comprehensive evaluation index for gas production engineering measures.A higher value of the comprehensive index indicates a better implementation effect of the corresponding gas production technology.The proposed method was applied to 60 producing wells in the Moxi Gas Field,and practical evaluation of the effectiveness of gas production engineering measures was completed.The results show that the overall effect of gas production engineering measures is relatively good for wells in the central part of the Moxi Gas Field,whereas the effect is moderate for some wells on the eastern and western flanks.The overall effect is relatively poor in low-productivity wells but comparatively good in high-productivity wells.The growth ratio of maximum wellhead deliverability before and after implementation is positively correlated with the comprehensive engineering index I,and gas wells with an effective period longer than 50 d exhibit better engineering performance.This work provides important theoretical reference and practical guidance for improving the evaluation system of gas production engineering measures for gas wells and for supporting efficient development and sustainable stable production of gas fields.
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