模糊识别方法在乌里亚斯太凹陷油藏压裂中的应用

Application of fuzzy recognition method to Wuliyastai depression reservoir fracturing.

乌里亚斯太凹陷油藏为一新开发的断块油田,在层面上分布很不均匀,用传统压裂软件无法很好地进行分析。鉴于模糊数学能从模糊中得出规律性,试图通过对乌里亚斯太前期压裂井参数的统计分析,用模糊数学方法来分析乌里亚斯太凹陷油藏压裂的选井选层,对可改变的压裂参数即施工参数进行优选以提高压裂效果。通过乌里亚斯太凹陷油藏投产初期20余口压裂井的地层参数、施工参数和改造前后生产数据的统计分析,寻找压裂井增产规律。在此基础上应用模糊识别数学模型理论指导压裂井的选井选层,并用该模型进一步优选压裂施工方案和对施工参数敏感性进行分析。实践证明,该方法简单易行,提出的选井选层原则与油田实际符合率高;分析优选出的施工参数及施工方案用实例井计算增产效果较明显,可作为乌里亚斯太油田今后压裂选井选层及施工的依据。

Wuliyastai depression reservoir is a new developed oilfield,and its bed plane distribution is unequal,it's can't be analyze perfectly by tradition fracturing software.In view of fuzzy recognition can get regularity from ambiguity things,analyzed fracture parameters of Wuliyastai reservoir,and selected fracturing wells and layers of it,optimized working parameters to enhance fracture effect.Statistical and analyzed formation parameters,working parameters and production data of 20 wells before fracturing and after fracturing,looking for stimulate regular of fracturing.From this,use fuzzy recognition model to select well and layer of fracturing,and optimize sensitivity of working schemes and parameters by it.Applications show that this method is simple and easy to do,select wells and layers of fracturing can fit well with the actual of oilfield,and selected working parameters and schemes have well stimulation effect.It can be used as fracturing directions of Wuliyastai Oilfield.