Vertical-well-assisted SAGD dilation process in heterogeneous super-heavy oil reservoirs:Numerical simulations

作     者：Zhi Yang Xingge Sun Chihui Luo Bin Xu Baohong Yang Biao Li 

作者机构：China National Petroleum CorporationXinjiang Oil FieldKaramay 834000XinjiangChina Origin Geomechanics Inc.CalgaryAlberta T3H 0X6Canada Department of BuildingCivil&Environmental EngineeringConcordia UniversityMontrealQuebec H3G 1M8Canada 

出 版 物：《Underground Space》 (地下空间（英文）)

年 卷 期：2021年第6卷第6期

页      面：603-618页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 082002[工学-油气田开发工程] 

基　　金：PetroChina Xinjiang Oilfield 

主　　题：Geomechanics Dilation SAGD Heterogeneous oil sand reservoir Stimulated reservoir volume 

摘      要：PetroChina’s Karamay heavy oil reservoirs mostly comprise Jurassic deposits of braided fluvial facies that have a low porosity,extremely high bitumen viscosity,and strong heterogeneities within the ***-assisted gravity drainage(SAGD)dilation start-up has been proven an efficient reservoir geomechanical stimulation method as it shortens the steam circulation time,reduces steam usage,and increases the oil production *** method worked well on relatively good-quality oil sand ***,for reservoirs with heterogeneous reservoir properties along the SAGD well,field well production data indicated the presence of non-uniform steam chambers in post-dilation SAGD *** dilation methods,such as vertical-well-assisted SAGD dilation(VW-SAGD-Dilation)are have been used,and field pilot tests have yielded promising *** reservoir stimulation process utilizes one or more vertical wells beside the SAGD well to initiate the formation of dilation zones that connect to the dilation zone formed during the conventional SAGD dilation *** with the normal SAGD dilation start-up,this composite dilation process creates a uniform dilation zone along the SAGD well,thus improving the thermal conformance and well *** vertical well and SAGD well are connected by this composite dilation zone,which enables the combined use of the SAGD process and cyclic steam stimulation *** paper presents our understanding and numerical case studies of this enhanced dilation *** well production data from the postdilation wells were positive(uniform steam chamber growth and higher oil rate),which highlights the promising potential of using geomechanical dilation as a reservoir stimulation method to create a large stimulated reservoir volume in heterogeneous super-heavy oil reservoirs.