基于距离判别的煤层压裂选井选层新方法

New selection method of coal seam fracturing well and layer
based on distance discriminant

 李吉雄¹ 李铁军 谢寿昌² 杨武剑¹ 施生伟¹

西南石油大学理学院，四川 成都 610500 中国石油新疆油田分公司开发公司，新疆 克拉玛依 834000

School of Sciences, Southwest Petroleum University, Chengdu 610500, China Development Company, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China

 水力压裂是煤层气增产改造中最为重要的措施，压裂选井选层是其中的一个重要环节。选择增产潜力大、压后效果好的井层进行压裂，既可节约开发成本又可获得理想效果。文中首先根据煤层性质初选了影响压裂效果的参数，并用灰色关联度对这些参数进行优选，然后按煤层气井的压后效果，将生产层划分为高、中、低产3大类，并结合多总体的距离判别分析建立判别模型，将所优选出的参数作为距离判别分析的输入指标，代入样本建立距离判别准则。用该准则对样本进行回判，正确率达到92%，说明该新方法具有较好的适应性和较高的准确性。该方法在山西省某区块的煤层气井层实际应用效果较好。

 Hydraulic fracturing is the most important transformation of coalbed methane measures, and fracturing well and layer selection is an important part of them. Selection of potential well and layer can save CBM development cost and get desired effect. According to the properties of coal seam, primary parameters affecting fracturing effect are selected, and are optimized by the grey correlation degree; based on the CBM well fracturing effect, production layer is divided into high-yield layer, middle-yield layer, low-yield layer, Combining with the general distance discriminant analysis, a discriminant model is established. Regarding the optimized parameters as the input index of distance discriminant analysis, substitution sample distance criterion is established. Using the principles to test samples, the accuracy reaches 92%. All of these show that the new method has the good adaptability and high accuracy. Finally, this method is applied in a block of CBM in Shanxi Province, which shows a good result.

10.6056/dkyqt201505029