A fuzzy method to quantitatively evaluate the effect of foam deliquification in gas wells

doi:10.3969/j.issn.1672-7703.2017.05.014

Abstract

Abstract: Deliquification is the primary technique for stabilizing gas production and improving gas recovery in the gas field with water produced, and foam deliquification is the key subject of research for purpose of enhancing natural gas production and reducing cost. However, there is no systematic method to evaluate and compare the effects of foam deliquification in gas wells with different working conditions. This paper introduces a fuzzy quantitative evaluation method which provides evaluation results based on four indicators (i.e. daily gas production, daily water production, tubing-casing pressure difference, and daily cost of foam injection) and using the linear analysis method, the analytic hierarchy process and a fuzzy synthetic operator. Applied to a total of 30 gas wells producing by foam deliquificaton in Sulige Gas Field and Chongqing Division of PetroChina Southwest Oil and Gas Field Company, the method delivered comprehensive evaluation indicators for measuring the effect of foam deliquification in gas wells. Since this method incorporates all technical and economic factors that influence the results and benefits of foam deliquification, and considers the membership relation between evaluation indicators and the weight coefficient of every indicator, it can be used to comprehensively and quantitatively evaluate the effect of foam deliquificaton in gas wells with different conditions, and it is helpful to the selection of target wells and the best foam agent before deliquificaton.

Key words: fuzzy quantitative evaluation, foam deliquification, effect evaluation method, comprehensive evaluation indicators, quantitative comparison

CLC Number:

TE375

Jia Min, Zhang Jianjun, Li Jun, Cao Guangqiang, Wu Junwen, Li Nan, Deng Chuangguo, Ren Yuefei, Zhang Jian. A fuzzy method to quantitatively evaluate the effect of foam deliquification in gas wells[J]. China Petroleum Exploration, 2017, 22(5): 119-124.

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