致密砂岩气藏井网加密与采收率评价  

Well network densification and recovery evaluation of tight sandstone gas reservoirs

作　　者：李奇 高树生[3,4] 刘华勋[3,4] 叶礼友[3,4] 吴泓辉 朱文卿[3,4] 张杰 杨懿 杨茂红 LI Qi;GAO Shu-sheng;LIU Hua-xun;YE Li-you;WU Hong-hui;ZHU Wen-qing;ZHANG Jie;YANG Yi;YANG Mao-hong(University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Porous Flow and Fluid Mechanics,Chinese Academy of Sciences,Langfang 065007,China;Department of Porous Flow and Fluid Mechanics,PetroChina Research Institute of Petroleum Exploration&Development,Langfang 065007,China;Research Institute of Petroleum Exploration and Development Company Limited,China National Petroleum Corporation,Beijing 100083,China;CNOOC Energy-Development Drilling and Production Company,Tianjin 300459,China;CNPC CCDC Drilling&Production Technology Research Institute,Xi'an 710018,China)

机构地区：[1]中国科学院大学,北京100049 [2]中国科学院渗流流体力学研究所,河北廊坊065007 [3]中国石油勘探开发研究院渗流流体力学研究所,河北廊坊065007 [4]中国石油集团科学技术研究院有限公司,北京100083 [5]中海油能源发展股份有限公司工程技术公司,天津300459 [6]中国石油川庆钻探工程有限公司工程技术研究院,陕西西安710018

出　　处：《天然气地球科学》2020年第6期865-876,共12页Natural Gas Geoscience

基　　金：国家自然科学基金项目“高温、高压、高应力下油气藏多尺度多场耦合非线性流动机理及表征研究之高温高压下储层多相流体流固耦合渗流规律研究”(编号:SL31909);中国石油天然气股份有限公司科技项目“天然气藏开发关键技术”(编号:2016B-15)联合资助。

摘　　要：致密砂岩气藏储层物性特征差异性较大,其不确定性严重制约气藏的稳产和高效开发。为有效开发致密砂岩气藏未动用储量,提高气田产量和采收率,对储层条件较为复杂的致密砂岩气藏进行井网密度优化是必要的。通过分析渗透率、孔隙度、有效厚度、含水饱和度、阈压梯度、产能系数和储容系数这7项储层物性参数对单井动态控制面积的影响,运用模糊数学方法,推理出井间无干扰时储层物性参数与单井动态控制面积的关系;并将计算所得的单井动态控制面积模糊预测值与地质井控面积对比,判断出不同储层物性条件下井网加密后井间是否会产生干扰,得到了随井网密度变化的干扰概率曲线,进而结合井间干扰概率构建了采收率评价模型,并在苏里格气田苏6区块开展应用。结果表明:使用新评价方法计算的致密砂岩气藏单井平均累计产气量及采收率,都与实际区块生产动态结果相一致,证明该方法是合理可靠的。采收率评价新方法为致密砂岩气藏井网优化提供了新思路。Tight sandstone gas reservoirs have large differences in physical properties and their uncertainty seriously restricts the stable production and efficient development of gas reservoirs.In order to effectively develop the unutilized reserves of tight sandstone gas reservoirs and improve gas production and recovery,it is necessary to optimize well pattern density of tight sandstone gas reservoirs with complex reservoir conditions.By analyzing the effects of seven reservoir physical parameters on single well dynamic control area,including permeability,porosity,effective thickness,water saturation,threshold pressure gradient,productivity coefficient and storage capacity coefficient,the relationship between reservoir physical parameters and single well dynamic control area without interference between wells is inferred by using fuzzy mathematics method.The calculated fuzzy prediction value of the single well dynamic control area is compared with the geological well control area to determine whether there will be interference between wells after the well pattern is encrypted under different reservoir physical conditions,and the interference probability curve that changes with the well pattern density is obtained.Furthermore,a recovery evaluation model is constructed based on the inter-well interference probability,which is applied in Su 6 well area.The results show that using the new evaluation method for tight sandstone gas reservoirs,the average cumulative gas production per well and recovery evaluated through the physical properties of the reservoir are consistent with the actual production dynamics results.Under certain conditions,this method is reasonable and reliable.The new method of recovery evaluation provides new ideas for well pattern optimization of tight sandstone gas reservoirs.

关 键 词：致密砂岩气藏 井网密度优化 物性参数 单井动态控制面积 干扰概率 采收率评价模型 

分 类 号：TE357[石油与天然气工程—油气田开发工程]