浅层气藏压裂裂缝参数优化计算模型研究  

RESEARCH OF OPTIMIZATION CALCULATION MODEL OF FRACTURE PARAMETERS IN THE FRACTURING PROCESS FOR SHALLOW GAS RESERVOIR

作　　者：罗伟[1] 周长林[1] 冉立[1] 罗颖胜[1] 

机构地区：[1]西南油气田公司采气工程研究院

出　　处：《钻采工艺》2011年第6期41-44,7-8,共4页Drilling & Production Technology

摘　　要：针对川西苏码头构造浅层气藏压后形成的裂缝可能为水平缝,而目前的水平缝压裂裂缝参数优化计算模型都为油藏模型,不能用于对气藏模型的计算,为此,对水平缝压裂气井裂缝参数优化计算模型进行了探索性研究。结合油藏工程理论和数值模拟技术,考虑气体在裂缝中为非达西渗流和裂缝导流能力随时间的变化等因素对压后产量的影响,采用二维柱坐标,建立了压裂气井气藏-水平裂缝系统的气体渗流数字模型,采用有限差分法对模型进行差分离散,利用VisualBasic编程语言进行了编程求解。以累积产量为目标,对气藏压裂裂缝参数进行了优化计算,并对水平缝与垂直缝进行了增产效果对比分析,计算结果表明,应用研制的软件可以分析影响水平裂缝气井产量的裂缝参数,计算压后增产效果,取得成果对于优化川西浅层气藏压裂设计方案和提高浅层气藏高效开采具有指导作用。In view of horizontal fracture exits in Sumatou structure in west Sichuan after fracturing. Present optimization calculation models of horizontal facture parameters are all oil reservoir models, and they can not be used for gas model calculation, therefore, optimization calculation model of facture parameters for horizontally fractured gas wells was researched. Combining reservoir engineering theory and numerical simulation technique, taking into account the influence factors of non-Darcy fluid of gas in fracture and fracture flow conductivity change with time on postfrac production, using 2-D cylindrical coordinate, the gas seepage mathematic model of gas reservoir and horizontal fracture system was established for fractured gas wells. The mathematic model was discretized by using finite difference method, and Visual Basic language was used to develop the software for resolving above problems. Meanwhile, taking cumulative production as the goal, the optimization calculation was carried out for the gas reservoir fracture parameters in the fracturing progress, and stimulation effect of horizontally fractured wells was compared with that of vertically fractured wells under same condition. Calculating results showed that, the developing soft could analyze fracture parameters that affect the production, and calculate post-fracturing stimulation effect.

关 键 词：川西苏码头构造 浅层气藏 裂缝参数 数值模拟 有限差分法 

分 类 号：P618.13[天文地球—矿床学]