强非均质超稠油SAGD储集层升级扩容数值模拟  

Numerical Simulation on Upgrading and Dilation of SAGD Ultra⁃Heavy Oil Reservoirs With High Heterogeneity

作　　者：孟祥兵 孙新革[2] 罗池辉[2] 马鸿[2] 王青[2] MENG Xiangbing;SUN Xinge;LUO Chihui;MA Hong;WANG Qing(PetroChina Xinjiang Oilfield Company,New Energy Deparment,Karamay,Xinjiang 834000,China;PetroChina Xinjiang Oilfield Company,Research Institute of Exploration and Development,Karamay,Xinjiang 834000,China)

机构地区：[1]中国石油新疆油田分公司新能源事业部,新疆克拉玛依834000 [2]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000

出　　处：《新疆石油地质》2023年第2期210-216,共7页Xinjiang Petroleum Geology

基　　金：中国石油科技专项(ks2020-01-01-03)。

摘　　要：新疆风城油田超稠油油藏储集层属陆相辫状河沉积,非均质性强,SAGD井组存在循环预热周期长、蒸汽腔发育不均等问题。前期储集层扩容试验能够显著提高蒸汽注入能力,缩短预热时间,但缺乏储集层扩容的全流程岩石力学耦合分析,不利于SAGD储集层升级扩容施工参数优化设计。基于岩石三轴压缩等室内实验,获取强非均质储集层岩石力学参数,建立耦合岩石力学的双水平井SAGD扩容热采数值模型,开展储集层升级扩容影响因素分析。通过对强非均质储集层开展分级分段扩容模拟,明确储集层升级扩容应包括井筒孔压预处理阶段、注汽井及分支应力扩容阶段、注汽井及分支大体积扩容阶段、注汽井与生产井井间连通阶段和注汽井上方大体积扩容阶段5个主要阶段,形成鱼骨井分段扩容等针对强非均质储集层的升级扩容策略。实践表明,储集层升级扩容技术适用于强非均质储集层,可使启动时间缩短50%,采油速度提高20%,可为强非均质储集层SAGD升级扩容施工参数优化提供借鉴。The ultra⁃heavy oil reservoirs in Fengcheng oilfield of Xinjiang belong to continental braided river deposits,with high heteroge⁃neity.The SAGD well group in the oilfield has problems such as long preheating period and uneven development of steam chambers.The initial reservoir dilation test can significantly improve steam injection capacity and shorten preheating period,but lacks the whole⁃process rock mechanics coupling analysis on reservoir dilation,which is not conducive to the optimal design of the parameters for SAGD reservoir upgrading and dilation.Based on laboratory experiments such as rock triaxial compression test,the rock mechanical parameters of highly heterogeneous reservoirs were obtained,and a numerical model of SAGD dilation and thermal production for dual horizontal wells coupled with rock mechanics was established to analyze the factors influencing reservoir upgrading and dilation.Through the hierarchical and seg⁃mented dilation simulation for the highly heterogeneous reservoirs,it is clear that the reservoir upgrading and dilation should include five stages,that is,wellbore pore⁃pressure pretreatment stage,stress dilation stage of steam injector and its branches,large⁃volume dilation stage of steam injector and its branches,steam injector and producer connection stage,and above⁃injector large⁃volume dilation stage.An upgrading and dilation strategy represented by segmental dilation of fishbone well was formed for highly heterogeneous reservoirs.Field ap⁃plication has shown that the proposed reservoir upgrading and dilation technology is suitable for highly heterogeneous reservoirs.The tech⁃nology can shorten the preheating period by 50%and increase the oil production rate by 20%.It provides a reference for the optimal design of parameters for SAGD upgrading and dilation in highly heterogeneous reservoirs.

关 键 词：风城油田 超稠油油藏 SAGD 强非均质储集层 升级扩容 岩石力学 数值模拟 分段扩容 

分 类 号：TE345[石油与天然气工程—油气田开发工程]