页岩气水平井段甜点优选模型

为实现页岩气水平井压裂层段精细开发,总结并筛选出了合适的段甜点评价指标,利用测完井数据计算了水平井段各项指标参数,基于提出的段指标基线值,采用组合权重方法开展了指标权重计算,通过标准化指标值和权重乘积的形式建立水平井段优选模型,并以涪陵地区A1井为例进行验证,优选结果表明：第3、4、5、7单元段优选指数高于0.45是水平井分段的最佳甜点位置;第1、2单元段优选指数介于0.4~0.45属于中等甜点位置;第6单元段优选指数介于0.35~0.4之间属于较差甜点位置,从A1井产气剖面可以验证段甜点指数和与单段产气量具有较好的正相关关系,本优选指数模型能有效避免第10段和第12段的无效性,以期为水平井精细开发时提供参考。

Dessert Selection Model for Horizontal Shale Gas

In order to realize the fine development of fractured intervals in shale gas horizontal wells, the evaluation indexes of suitably fractured intervals are summarized and screened. The parameters of horizontal intervals are calculated by using the measured completion data. Based on the baseline values of the interval indexes, the weights of indexes are calculated by the combined weights method, and the weights are multiplied by standardized indexes and weights. The optimization model of horizontal well section is established in the form of product, and verified by well A1 in Fuling area. The optimization results show that the optimal dessert location of horizontal well section is higher than 0.45 in unit 3, 4, 5 and 7; the optimal dessert location of unit 1 and 2 is between 0.4 and 0.45; the optimal dessert location of unit 6 belongs to the medium dessert location. The dessert index of section A1 and its positive correlation with single section gas production can be verified from the gas production profile of well A1. This optimization index model can effectively avoid the invalidity of section 10 and 12, so as to provide reference for fine development of horizontal wells.