石油科学通报2024，Vol.9Issue(3)：487-502,16.DOI:10.3969/j.issn.2096-1693.2024.03.036
深层页岩气井气水两相缝网参数反演方法
Inversion method for deriving fracture network parameters in deep shale gas well considering gas-water two-phase flow
摘要
Abstract
Deep shale formations are so tight and low permeable that large-scale hydraulic fracturing technology is used to increase production to achieve economic development,and the inversion method of fracture network parameters is an important means of evaluation of hydraulic fracturing performance and gas well productivity analysis.The existing fracture network parameter inversion methods do not consider the influence of uneven distribution of proppant in fractures and gas-water two-phase seepage on the development of deep shale gas reservoirs after hydraulic fracturing,resulting in considerable error in parameter inversion,and it is difficult to distinguish the contribution of"near-well propped fractures"and"far-well unpropped fractures"to productivity.To solve this problem,based on the dynamic analysis method,a gas-water two-phase fracture network parameter inversion method is established for deep shale gas reservoirs considering multiple nonlinear flow mechanisms and incompletely propped fractures.In the inversion method of fracture network parameters,based on the assumption of the linear flow model,the complex fracture network formed after hydraulic fracturing is equivalent to four areas:propped artificial fracture,fracture stimulated inner formation,un-propped artificial fracture and fracture stimulated outer formation.Variable substitution,perturbation transformation,and successive substitution are used to deal with the nonlinearity caused by high-pressure gas physical parameters,supercritical adsorption,stress sensitivity,non-Darcy seepage and gas-water two-phase seepage.The reliability of the method is verified by numerical simulation,and four deep shale gas wells in the Sichuan Basin are selected for application analysis.The results show that the parameter inversion method established considers the influence of gas-water co-production on productivity prediction and parameter inversion,and can quantitatively distinguish between propped and unpropped fractures with parameters such as half-length and permeability,providing theoretical guidance for accurate prediction of deep shale gas production and evaluation of fracturing effects.关键词
深层页岩气/未完全支撑裂缝/气水两相流动/缝网参数反演/动态分析方法Key words
deep shale gas/incompletely propped fractures/gas-water two-phase flow/fracture network parameter inversion/dynamic analysis method分类
能源科技引用本文复制引用
张娇娇,黄世军,赵凤兰,方思冬..深层页岩气井气水两相缝网参数反演方法[J].石油科学通报,2024,9(3):487-502,16.基金项目
国家自然科学基金项目"页岩储层条件下水对甲烷—二氧化碳竞争吸附的影响及相互作用机制研究"(51974328)和国家自然科学基金—联合基金项目"深层页岩气开发动态评价与数值模拟方法研究"(U19B6003-03-05)联合资助 （51974328）
