CAJ | 학술논문

为了实现致密气藏裂缝参数优化设计，考虑非达西效应对裂缝渗透率的影响，引入有效渗透率，对传统的支撑剂指数进行了修正；然后，利用边界元法，作出表征无因次采气指数、支撑剂指数和裂缝有效导流能力之间关系的图版，拟合出 f函数；最后，通过迭代获得最优裂缝参数和裂缝导流能力，形成了以采气指数为目标函数、考虑非达西效应的致密气藏裂缝参数优化设计方法。利用苏里格气田某致密气藏的数据，对比分析了是否考虑非达西效应对裂缝参数优化设计的影响。结果表明，考虑非达西效应后，支撑剂指数为不考虑非达西效应时的1／5，有效导流能力为不考虑非达西效应时的1／3，最优缝长缩短了1／5，最优缝宽增大了1／4。研究结果表明，利用修正支撑剂指数可以进行致密气藏裂缝参数的优化设计，利用该方法优化的缝长和缝宽与修正前相比分别缩短和增宽，设计结果更加准确。
위료실현치밀기장렬봉삼수우화설계，고필비체서효응대렬봉삼투솔적영향，인입유효삼투솔，대전통적지탱제지수진행료수정；연후，이용변계원법，작출표정무인차채기지수、지탱제지수화렬봉유효도류능력지간관계적도판，의합출 f함수；최후，통과질대획득최우렬봉삼수화렬봉도류능력，형성료이채기지수위목표함수、고필비체서효응적치밀기장렬봉삼수우화설계방법。이용소리격기전모치밀기장적수거，대비분석료시부고필비체서효응대렬봉삼수우화설계적영향。결과표명，고필비체서효응후，지탱제지수위불고필비체서효응시적1／5，유효도류능력위불고필비체서효응시적1／3，최우봉장축단료1／5，최우봉관증대료1／4。연구결과표명，이용수정지탱제지수가이진행치밀기장렬봉삼수적우화설계，이용해방법우화적봉장화봉관여수정전상비분별축단화증관，설계결과경가준학。
In order to determine the optimum design of the fracture parameters for tight gas reservoirs , effective permeability was introduced to modify the conventional proppant number considering the impact of non‐Darcy effects on fracture permeability and conductivity .The boundary element method was used to make a chart w hich represented the relationship among the non‐dimensional gas productivity index ,the proppant number and the effective fracture conductivity ,and then obtained an equation of f function .Next , the optimal parameters and conductivity of the fracture network were obtained through iterations of the al‐gorithm ,and formed an optimization method of fracture parameter in tight gas reservoir w hich considered non‐Darcy effect and taken gas productivity as objective function .The data of tight gas reservoir in Sulige block was used to analyze the impact of non‐Darcy effect on the optimization of fracture parameters .The results showed that ,when considering non‐Darcy effect ,the proppant number was 20 percent of that with‐out considering it ,and the effective fracture conductivity was 33 percent ,the optimal fracture length was re‐duced by 20 percent ,and the width of fracture increased by 25 percent .In conclusion ,the optimal design of tight gas reservoir fracture parameter can be calculated by revising the proppant number ,which resulted in shorter and wider .