页岩气储层水力压裂成功的地质力学敏感性分析

Desti Hernomita, Tomi Erfando
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引用次数: 2

摘要

页岩气的渗透率为0.1 mD,孔隙度约为2% - 8%,通过水力压裂和水平钻井,页岩气会上升到地面。地质力学是影响水力压裂作业成功与否的重要因素之一。裂缝技术使地质力学成为预测岩石变形成功或失败的一个明确因素,并了解裂缝流体将面临的性质,这些性质将在以后用于观察裂缝流体抵抗裂缝的有效性。需要进一步研究高作业成本,以确定影响水力压裂工作的参数,特别是从地质力学方面,以最大限度地减少生产故障和工作安全。本次研究的重点是地质力学参数的敏感性,采用CMG (GEM)油藏模拟油藏模型,并在水力压裂过程之前在现场应用时采用响应面法(RSM)进行选择和简化。在本次敏感性研究中,对应力、泊松比、杨氏模量、生物系数和孔隙压力5个参数进行了敏感性研究。利用方差分析方法对500组数据集进行敏感性分析,得到对水力压裂工作影响最大的地质力学参数R2 = 0.99,孔隙压力变量重要性值为3.8。则杨氏模量为0.28,应力为0.12,泊松比为0.08,生物系数为0.04。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sensitivity Analysis of Geomechanics Influence on The Success of Hydraulic Fracturing in Shale Gas Reservoir
Shale gas has a permeability of <0.1 mD and a porosity of around 2% - 8% to produce gas that rises to the surface through hydraulic fracturing and horizontal drilling. Geomechanics is one of the important factors that influence the success of a hydraulic fracturing job. Technology in fractures makes geomechanics a clear factor in predicting the success or failure of rocks in deformation and knowing the properties that will be faced by fracture fluids which will later be used to see the effectiveness of fracture fluids in resisting fractures. High operational costs need to be studied further to determine the parameters that affect hydraulic fracturing work, especially from the geomechanical aspect to minimize production failures and work safety. The research conducted this time focuses on the sensitivity of geomechanical parameters by using CMG (GEM) reservoir simulations for reservoir models and conducting Response Surface Methodology (RSM) in selection and ease when applied in the field prior to the hydraulic fracturing process. In this sensitivity study carried out on 5 parameters namely stress, Poisson's ratio, Young's modulus, biot coefficient, and pore pressure. The geomechanical parameter that has the most influence on hydraulic fracturing work based on the sensitivity results carried out through 500 data sets using the Analysis of Variance obtained R2 = 0.99 with the results based on the importance value of the pore pressure variable of 3.8. Then Young's modulus is 0.28, stress is 0.12, Poisson's ratio is 0.08, and biot coefficient is 0.04.
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