钻井液与完井液2017，Vol.34Issue(4)：69-74,6.DOI:10.3969/j.issn.1001-5620.2017.04.013
基于模糊数学的防气窜能力评价新方法及应用
A New Fuzzy Mathematics-based Method for Anti-channeling Performance Evaluation and Its Application
摘要
Abstract
Gas channeling in annular spaces is a difficult problem seriously harmful to cementing almost all gas wells.Accurate evaluation of cement slurry's anti-channeling performance is one of the key technologies for the prevention of gas channeling in annular spaces. There are several factors which affect gas channeling in annular spaces in a combined way, while the evaluation methods presently in use do not take them all in consideration and have limited accuracy, and hence they cannot give a full view of the problem they are trying to reveal. In this study, fuzzy mathematics has been used in establishing a model used in predicting comprehensively the anti-channeling performance of a cement slurry. This model takes into account the characteristics of gas channeling in annular spaces. Five commonly used evaluation methods, such as GFP method and SPN method etc., are integrated into an evaluation factor set,"good", "medium" and "poor" anti-channeling capacity are used as an evaluation set. Based on the characteristics of each factor, a corresponding membership function is determined. Use the principles of analytic hierarchy process, the weighted fuzzy set of each factor is calculated, and according to the "maximum subordination principle", the overall risk of sand production is determined. It has been proved that this evaluation method can be used to effectively predict gas channeling in well cementing. It provides a more comprehensive and integrated evaluation method for optimizing cement slurry formulation to prevent pressurized wellhead after well cementing, thereby to ensure the quality and safety of a cemented well.关键词
固井/气窜/水泥浆/综合预判/层次分析法/模糊数学Key words
Well cementing/Gas channeling/Cement slurry/Comprehensive prediction/Analytic hierarchy process/Fuzzy mathematics分类
能源科技引用本文复制引用
李进,高斌,龚宁,谢中成,陈毅,韩耀图..基于模糊数学的防气窜能力评价新方法及应用[J].钻井液与完井液,2017,34(4):69-74,6.基金项目
"十三五"国家重大科技专项"渤海油田高效开发示范工程"(2016ZX05058) （2016ZX05058）
