基于格子Boltzmann法的碳酸盐岩气藏多层合采模拟  

Multi-layer commingled production simulation for carbonate gas reservoir based on lattice Boltzmann method

作　　者：孙天礼[1] 陈伟华 黄仕林[3] 方鸿铭 张涛[4] 赵玉龙[4] SUN Tianli;CHEN Weihua;HUANG Shilin;FANG Hongming;ZHANG Tao;ZHAO Yulong(Southwest Oil and Gas Company,SINOPEC,Langzhong 637400,China;Engineering Technology Research Institute,Southwest Oil&Gas Field Company,PetroChina,Chengdu 610017,China;Exploration and Development Research Institute,Southwest Oil&Gas Company,SINOPEC,Chengdu 610041,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中国石化西南油气分公司,四川阆中637400 [2]中国石油西南油气田公司工程技术研究院,四川成都610017 [3]中国石化西南油气分公司勘探开发研究院,四川成都610041 [4]西南石油大学油气藏地质与开发国家重点实验室,四川成都610500

出　　处：《断块油气田》2022年第6期848-853,共6页Fault-Block Oil & Gas Field

基　　金：中国石油-西南石油大学创新联合体科技合作项目“多重介质跨尺度碳酸盐岩有水气藏数值模拟技术”(2020CX010403)。

摘　　要：多层合采是纵向发育多个层系储层的常用开发手段,碳酸盐岩气藏孔-缝-洞发育复杂,导致其合采机理不明确、常规手段评价合采效果难度大。因此,采用新方法评价其多层合采机理及潜在干扰因素具有重要的理论与现实意义。文中基于多松弛格子玻尔兹曼方法(MRT-LBM),通过追踪合采过程的流线分布,量化评价了不同孔-缝-洞配置储层的合采效果。研究结果表明:裂缝-孔洞合采的层间非均质性最大,裂缝层对产量贡献很小,裂缝-缝洞合采与缝洞-孔洞合采的层间非均质性相对更小,两层基本可以实现均衡开发;增加生产压差,合采气层的产量比降低,一定程度有助于低渗产层的气体产出,且生产压差对非均质性强的合采组合敏感性更强;当合采层间的压力梯度差值为0.02 MPa/m时,低压层的稳定倒灌量可能达到高压层的1/8;如果层间非均质大且低渗层初始压力更低时,发生倒灌的可能性更大。研究成果可以为不同孔-缝-洞发育的碳酸盐岩气藏多层合采提供理论支撑。Multi-layer commingled production is a popular method for the development of multi-layer reservoir.The occurrence of pore-fracture-cave in carbonate gas reservoir is complex,which results in the uncertainties of commingled production mechanisms and difficulties in evaluation of commingled production performances using conventional methods.Therefore,it is of great significance both in theoretically and practically to understand the multi-layer commingled production mechanisms and the potential interferences by using new method.In this work,based on the multi-relaxation lattice Boltzmann method(MRT-LBM),through tracking the distribution of streamlines,the commingled production performances of reserviors with different pore-fracture-cave configurations are quantified.The results show that the inter-layer heterogeneity of fracture and pore-cave layer is highest compared with the other two cases,which results in small gas production of the fracture layer.The fracture and fracture-cave layer have relatively small inter-layer heterogeneity with fracture-cave and pore-cave layer,and the two layers can be recovered evenly.With the increase of production pressure difference,the gas production ratio of commingled production layer decreases,which facilitates the gas recovery in the production layer with lower permeability.The commingled production configuration with strong heterogeneity is more sensitive to the production pressure difference.If the pressure gradient difference between the two layers is 0.02 MPa/m,the backflow volume in the low pressure layer can be 1/8 of the production in the high-pressure layer.If the inter-layer heterogeneity is strong and the layer with low permeability has lower initial pressure,the possibility of backflow is higher.This work can provide theoretical support for the commingled production of multi-layer carbonate reservoirs with complex occurrence of pore-fracture-cave.

关 键 词：碳酸盐岩气藏 多层合采 格子玻尔兹曼模拟 流线分布 倒灌 

分 类 号：TE32[石油与天然气工程—油气田开发工程]