A microfracturing-based expansion technology for horizontal wells was proposed to improve the seepage conditions around the horizontal wellbore, because the infill horizontal wells were not connected to the original wells in composite well pattern under steam flooding and gravity drainage in the heterogeneous reservoirs, Qigu Formation, F Oilfield, Xinjiang Oilfield. The feasibility of microfracturing-based expansion technology and the change characteristics of expanded reservoir were analyzed by laboratory core test, geomechanical finite element simulation and thermal numerical simulation. The results show that he reservoir was high in high quartz while low in clay mineral content, and well developed with pores, which was favorable for water flooding for expansion; in the process of stable pressurization, the spread range of the injection fluid was expanded to reduce the effective confining pressure of the surrounding reservoir and significantly improve the expansion effect; the displacement and porosity of the expanded reservoir in longitudinal direction were obviously better than that in transverse direction, which is conducive to the connection of upper and lower injection-production wells. After five rounds of steam stimulation for preheating after microfracturing-based expansion, the oil wells were connected quickly. In the preheating period, the periodic oil production and oil-steam ratio were significantly improved, and the productivity of horizontal section was greatly enhanced. The study results provide a reference for improving the connectivity among injection and production wells in composite well pattern under steam flooding and gravity drainage.
[1] 卢迎波,胡鹏程,申婷婷,等.电加热辅助蒸汽吞吐提高水平井水平段动用程度的技术[J].大庆石油地质与开发,2022,41(2):167-174.
LU Yingbo,HU Pengcheng,SHEN Tingting,et al.Enhancing technique of horizontal section producing degree by electrical-heating-assistant steam huff and puff for horizontal well[J].Petroleum Geology & Oilfield Development in Daqing,2022,41(2):167-174.
[2] 赵睿,桑林翔,陈伦俊,等.直井辅助SAGD扩容及地质力学-热采耦合数值模拟[J].特种油气藏,2021,28(3):81-86.
ZHAO Rui,SANG Linxiang,CHEN Lunjun,et al.Vertical well assisted SAGD dilation and coupled numerical simulation of geomechanics and thermal recovery[J].Special Oil & Gas Reservoirs,2021,28(3):81-86.
[3] 林伯韬,金衍.新疆风城油田SAGD井挤液扩容效果影响因素评价[J].石油钻探技术,2018,46(6):71-76.
LIN Botao,JIN Yan.Evaluation of the influencing factors of dilatancy effects by squeezing liquids in SAGD wells in the Fengcheng Oilfield of Xinjiang Oilfield[J].Petroleum Drilling Techniques,2018,46(6):71-76.
[4] 杨洪,陈森,张玉凤,等.风城SAGD微压裂扩容启动数值模拟及应用[J].新疆石油天然气,2017,13(2):38-42.
YANG Hong,CHEN Sen,ZHANG Yufeng,et al.Numerical simulation and application of micro-fracturing expanding start-up of SAGD process for Fengcheng[J].Xinjiang Oil & Gas,2017,13(2):38-42.
[5] 吕世瑶,李永会,李海波,等.稠油油藏水平井超临界注水井井筒物性参数预测模型[J].大庆石油地质与开发,2021,40(4):54-62.
LYU Shiyao,LI Yonghui,LI Haibo,et al.Predicting model of the physical property parameter of super-critical water injection wellbore in horizontal well of heavy oil reservoirs[J].Petroleum Geology & Oilfield Development in Daqing,2021,40(4):54-62.
[6] 陈森,林伯韬,金衍,等.SAGD井微压裂储层渗透率变化规律研究[J].西南石油大学学报(自然科学版),2018,40(1):141-148.
CHEN Sen,LIN Botao,JIN Yan,et al.Study on patterns of change in oil reserve permeability during microfracturing of SAGD wells[J].Journal of Southwest Petroleum University(Science & Technology Edition),2018,40(1):141-148.
[7] 刘雪峰,吴向阳,李刚,等.延长气藏压裂改造支撑裂缝导流能力系统评价[J].断块油气田,2018,25(1):70-75.
LIU Xuefeng,WU Xiangyang,LI Gang,et al.Systematic evaluation of propped fracture conductivity in Yanchang Gas Reservoir[J].Fault-Block Oil & Gas Field,2018,25(1):70-75.
[8] 林伯韬,陈森,潘竟军,等.风城陆相超稠油油砂微压裂扩容机理实验研究[J].石油钻采工艺,2016,38(3):359-364.
LIN Botao,CHEN Sen,PAN Jingjun,et al.Experimental study on dilation mechanism of micro-fracturing in continental ultra-heavy oil sand reservoir,Fengcheng Oilifeld[J].Oil Drilling & Production Technology,2016,38(3):359-364.
[9] 刘乃震,张兆鹏,邹雨时,等.致密砂岩水平井多段压裂裂缝扩展规律[J].石油勘探与开发,2018,45(6):1059-1068.
LIU Naizhen,ZHANG Zhaopeng,ZOU Yushi,et al.Propagation law of hydraulic fractures during multi-staged horizontal well fracturing in a tight reservoir[J].Petroleum Exploration and Development,2018,45(6):1059-1068.
[10] 白晓虎,齐银,何善斌,等.致密储层水平井压裂-补能-驱油一体化重复改造技术[J].断块油气田,2021,28(1):63-67.
BAI Xiaohu,QI Yin,HE Shanbin,et al.Integrated re-stimulating technology of fracturing-replenishment-displacement of horizontal wells in tight reservoirs[J].Fault-Block Oil & Gas Field,2021,28(1):63-67.
[11] 吴寒.新疆风城陆相非均质超稠油储层地应力分布研究[D].北京:中国石油大学(北京),2019.
WU Han.Study of ground stress distribution in continental non-homogeneous super-heavy oil reservoirs in Fengcheng,Xinjiang[D].Beijing:China University of Petroleum(Beijing),2019.
[12] WONG R C K.A model for strain-induced permeability anisotropy in deformable granular media[J].Canadian Geotechnical Journal,2003,40(1):95-106.
[13] 李小龙.低渗稠油储层径向井辅助压裂裂缝扩展规律研究[D].青岛:中国石油大学(华东),2018.
LI Xiaolong.Study of fracture propagation law of radial well assisted fracturing in low permeability heavy oil reservoirs[D].Qingdao:China University of Petroleum(East China),2018.
[14] 高彦芳,王晓阳,任战利,等.克拉玛依陆相油砂注水过程中的剪胀诱导渗透率模型[J].石油钻采工艺,2021,43(2):244-249.
GAO Yanfang,WANG Xiaoyang,REN Zhanli,et al.A model of shear dilation induced permeability evolution in the process of water injection in Karamay continental oil sand[J].Oil Drilling & Production Technology,2021,43(2):244-249.
[15] 高彦芳,陈勉,林伯韬,等.温度对油砂力学性质的影响规律研究[J].岩石力学与工程学报,2018,37(11):2520-2535.
GAO Yanfang,CHEN Mian,LIN Botao,et al.Thermal influences on mechanical properties of oil sands[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(11):2520-2535.
[16] FAN Yuxing,SUN Xinge,MAI Xin,et al.In-situ catalytic aquathermolysis combined with geomechanical dilation to enhance thermal heavy-oil production[C].SPE184981-MS,2017:1-14.
[17] ZHANG Jing,FAN Yuxing,XU Bin,et al.Steam circulation strategies for SAGD wells after geomechanical dilation start-up[C].SPE180705-MS,2016:1-12.
[18] YUAN Yanguang,XU Bin.PALMGREN Claes.Design of caprock integrity in thermal stimulation of shallow oil-sand reservoirs[J].Journal of Canadian Petroleum Technology,2013,52(4):266-278.
[19] XU Bin,RON C K W.Coupled finite-element simulation of injection well testing in unconsolidated oil sands reservoir[J].International Journal for Numerical and Analytical Methods in Geomechanics,2013,37(18):3131-3149.
