分层压裂工艺优选的模糊综合评判方法

Fuzzy comprehensive evaluation method for optimization of separate layer fracturing technology

难动用储量在油气资源中所占比例逐渐增大,且大都表现出储层层系多、间距小及物性条件差等特点,分层压裂工艺已成为此类油气藏投产、增产的主要方法。由于影响分层压裂工艺选择的因素很多,而且因素本身也具有一定的模糊性和复杂性,所以分层压裂工艺科学选择的难度很大。传统的分层压裂工艺选择主要依据设计者的经验,具有一定的主观性和盲目性。根据模糊数学和系统工程学原理,在分析分层压裂工艺影响因素的基础上,引入模糊综合评判法和层次分析法,得到一种分层改造工艺选择方法。将选择出的方法应用于川西地区5口气井的分层压裂工艺选择中,取得了较好的效果。

The proportion of difficult-to-produce reserves are increasing in oil and gas resources gradually, and most of them show the characteristics of multiple layer systems, small interspacing and poor physical property of reservoirs. The separate layer fracturing technology is an essential method for commissioning and stimulation of this kind of reservoir. Because many factors have influenced the separate layer fracturing technology and these factors themselves have a certain ambiguity and complexity, it is difficult to choose the separate layer fracturing technology scientifically. Traditionally, the selection of separate layer fracturing technology mainly depends on the experience of designer, which has the definite subjectivity and blindness. By means of the principles of fuzzy mathematics and system engineering, the fuzzy method of comprehensive evaluation and analytical hierarchy process are introduced based on the analysis of influential factors for separate layer fracturing technology. A method for the selection of separate layer fracturing technology has been gotten. The method has been applied to the selection of separate layer fracturing technology in five gas wells of West Sichuang area, and a good result has been obtained.