强非均质超稠油油藏SAGD储层升级扩容研究  

Study on upgraded dilation of SAGD reservoirs with strong heterogeneity and ultra-heavy oil

作　　者：孙新革[1] 罗池辉[1] 徐斌 杨智[1] 孟祥兵[1] SUN Xinge;LUO Chihui;XU Bin;YANG Zhi;MENG Xiangbing(Exploration and Production Research Institute,PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang,834000,China;Department of Building,Civil&Environmental Engineering,University of Calgary,Calgary,T2N1N4,Canada)

机构地区：[1]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 [2]卡尔加里大学建筑、土木与环境工程系,加拿大卡尔加里T2N1N4

出　　处：《油气地质与采收率》2021年第6期38-45,共8页Petroleum Geology and Recovery Efficiency

基　　金：中国石油股份公司科技专项“稠油油藏蒸汽热采(吞吐/汽驱/SAGD)中后期接替技术研究”(ks2020-01-01-03)。

摘　　要：新疆风城油田超稠油油藏属陆相辫状河沉积,其储层非均质性强,渗透率变异系数为0.7~0.9,泥质夹层分布密度为2.4条/m,导致SAGD井组存在水平段动用程度低、蒸汽腔扩展不均等问题。基于储层岩石力学特性和扩容机理,利用在真三轴地应力条件下的大型物理模拟和耦合岩石力学数值模拟,开展了可控升级扩容技术的研究,明确了突破SAGD注采水平井间夹层、突破SAGD注汽水平井上方夹层、动用多分支段等最优扩容方式及参数。结果表明:风城油田A井区油砂在低围压条件下具有较强的剪胀效应,恒定压力结合阶梯稳定提压的方式可以形成复杂扩容区,最大体积扩容量高达7%,在合理扩容参数下,风城油田超稠油储层扩容半径为10~15 m。强非均质超稠油油藏SAGD储层升级扩容技术与传统的快速均匀启动技术相比,储层适应性更好且增产效果显著。The ultra-heavy oil reservoirs of Fengcheng Oilfield in Xinjiang are continental braided fluvial facies with strong heterogeneity.The permeability variation coefficient is 0.7-0.9,and the distribution density of muddy interlayers is 2.4 strips/m.As a result,SAGD well groups have some prominent problems,such as low producing degree of the horizontal sec⁃tion and uneven expansion of steam chambers.In virtue of the mechanical properties and the dilation mechanism of reser⁃voir rocks,this paper studies the controllable upgraded dilation technology by using large-scale physical simulation and coupled numerical simulation of rock mechanics under the true triaxial in-situ stress,and specifies the optimal dilation methods and parameters for breaking the interlayers between injection and production horizontal wells,breaking the inter⁃layers above steam injection horizontal wells,and producing multilateral well sections of SAGD reservoir.According to the results,the oil sands of Well Block A of Fengcheng Oilfield has a strong dilation effect under low confining pressures.A complex dilation area can be formed under the effect of both constant pressure and stepwise raised pressure,and the maxi⁃mum dilation volume is as high as 7%.Under the condition of reasonable dilation parameters,the dilation radius of ultra heavy oil reservoirs of Fengcheng Oilfield can reach 10-15 m.Compared with the traditional fast and uniform start-up tech⁃nology,the technology for the upgraded dilation of SAGD reservoirs with strong heterogeneity and ultra-heavy oil can real⁃ize better reservoir adaptability and significantly increase oil production.

关 键 词：强非均质 超稠油油藏 SAGD 储层升级扩容 物理模拟 耦合岩石力学数值模拟 

分 类 号：TE345[石油与天然气工程—油气田开发工程]