To further improve the productivity of the horizontal intervals in SAGD well cluster that has entered the steam chamber expansion stage in Fengcheng Oilfield, an integrated numerical model of electric heating-assisted SAGD was established with typical reservoir parameters to study the seepage characteristics of downhole electric heating and optimize the design of operating parameters. The results showed that, downhole electric heating performed in the SAGD expansion stage had four important mechanisms: fixed-point heating, promotion of steam chamber development, fixed-point oil drainage, and improvement of effective permeability in low-permeability intervals; the reasonable steam injection rate was 158-171 m3/d, the steam chamber operating pressure was 4.9-5.4 MPa, the pressure difference between injection and production wells was 0.4-0.5 MPa, and the inter-well pressure difference between adjacent well clusters was less than 0.5 MPa; the reasonable electric heating duration was 2.0-3.0 years, the maximum surface temperature of the electric heater was 250 ℃, and the power was 800-1 000 W/m; the productivity of horizontal interval was increased from 67% to 100% after the typical well cluster was electrically heated for 3.0a, the daily oil production was increased by 2-4 m3/d,Accamulative oil-steam ratio in creased from 0.15 to 0.24, and the final recovery efficiency reached 51.3%, an increase of 8.1 percentage points. The study results can be used as a guidance for improving the development effect of SAGD.
Ding Chao
,
Yang Zhaochen
,
Wu Yongbin
,
Wang Li
,
Yang Haozhe
,
Wang Chao
. Electric Heating Mechanism and Operating Parameter Optimization in the Expansion Stage of SAGD Steam Chamber[J]. Special Oil & Gas Reservoirs, 2022
, 29(3)
: 124
-130
.
DOI: 10.3969/j.issn.1006-6535.2022.03.018
[1] 程仲富.塔河油田超深超稠油矿物绝缘电缆加热技术研究[J].长江大学学报(自然科学版),2017,14(21):32-35.
CHENG Zhongfu.The technology for heating with insulating cable in ultra-deep and ultra-heavy oil wells in Tahe Oilfield[J].Journal of Yangtze University(Natural Science Edition),2017,14(21):32-35.
[2] 李伟超,刘平,于继飞,等.渤海稠油油田井筒电加热技术可行性分析[J].断块油气田,2012,19(4):513-516.
LI Weichao,LIU Ping,YU Jifei,et al.Feasibility analysis on electric heating of wellbore in heavy oilfield of Bohai[J].Fault-Block Oil & Gas Field,2012,19(4):513-516.
[3] 刘红兰,王富,陈俊.新型井下电加热降黏技术在埕岛油田的应用[J].中国海上油气,2005,17(1):45-51.
LIU Honglan,WANG Fu,CHEN Jun.The application of new down hole electric heater technique in ESP wells of Chengdao Oilfield[J].China Offshore Oil and Gas,2005,17(1):45-51.
[4] 修德欣.海上稠油油田电加热开采技术研究[D].青岛:中国石油大学(华东),2014:63-77.
XIU Dexin.Research on electric heating technology for offshore thick oilfield[D].Qingdao:China University of Petroleum(East China),2014:63-77.
[5] 柳潇雄,蒋有伟,吴永彬,等.双水平井蒸汽辅助重力泄油恒温电预热数学模型与指标预测[J].石油勘探与开发,2018,45(5):839-846.
LIU Xiaoxiong,JIANG Youwei,WU Yongbin,et al.A mathematical model and relevant index prediction for constant-temperature electric heating of dual-horizontal-well SAGD start-up[J].Petroleum Exploration and Development,2018,45(5):839-846.
[6] 吴永彬,桑林翔,李秀峦,等.浅层超稠油双水平井SAGD电预热启动关键参数优化设计[C].IFEDC20194576,2019:1-10.
WU Yongbin,SANG Linxiang,LI Xiuluan,et al.Optimal design of key parameters for SAGD electric preheating start-up in shallow super-heavy oil dual horizontal wells[C].IFEDC20194576,2019:1-10.
[7] 桑林翔,王立龙,吴永彬,等.SAGD电加热启动技术油藏适应性研究[J].特种油气藏,2020,27(3):109-114.
SANG Linxiang,WANG Lilong,WU Yongbin,et al.Adaptability of SAGD electric heating startup technology[J].Special Oil & Gas Reservoirs,2020,27(3):109-114.
[8] 魏绍蕾,程林松,张辉登,等.稠油油藏双水平井SAGD生产电预热模型[J].西南石油大学学报(自然科学版),2015,38(1):92-98.
WEI Shaolei,CHENG Linsong,ZHANG Huideng,et al.Analytical solution for double-horizontal-well SAGD electric preheating model of heavy oil reservoirs[J].Journal of Southwest Petroleum University(Science & Technology Edition),2015,38(1):92-98.
[9] XI Changfeng,QI Zongyao,JIANG Youwei,et al.Dual-horizontal wells SAGD start-up technology:from conventional steam circulation to rapid and uniform electric heating technology[C].SPE189241,2017:1-9.
[10] BEHDAD M,NEIL E.Quantifying heat requirements for SAGD startup phase:steam injection, electrical heating[C].SPE165578,2013:1-6.
[11] 吴永彬,李秀峦,郑浩然,等.电加热辅助SAGD生产关键机理研究[C].IFEDC20182134,2018:1-7.
WU Yongbin,LI Xiuluan,ZHENG Haoran,et al.Study on the key mechanism of electric heating assisted SAGD production[C].IFEDC20182134,2018:1-7.
[12] WU Yongbin,LI Xingmin,HE Wanjun.Numerical simulation of electrical-heating assisted SAGD in heterogeneous heavy oil reservoirs[C].SPE186023,2017:1-10.
[13] LIN Jun,JIANG Cheng,LU Fugang.Enhance heavy oil production of horizontal well by distributed downhole electrical heating[C].SPE165453,2013:1-10.
[14] SUN Feng,XUE Shifeng,WANG Haijing.Experimental research on thermal cracking of mudstone for heavy oil thermal production[C].SPE180754,2016:1-8.
[15] MA M X,RABIEI F M,HASSANZADEH H.Comparative study of SAGD and solvent and water assisted electrical heating:effect of shale layers[C].SPE184997,2017:1-9.
[16] ALI S M,FAROUQ B B.Electrical heating-doing the same thing over and over again[C].SPE189724,2018:1-18.
[17] SIERRA R,BRIDGES J,MATA W,et al.Evolution of reservoir electrical heating: new promise in field applications[C].WPC30179,2000:1-12.
[18] CARPENTER C.Downhole electrical heating for enhanced heavy-oil recovery[J].Journal of Petroleum Technology,2014,66(3):132-134.
[19] SANDBERG C T,KEITH H A.Advances in electrical heating technology for heavy oil production[C].SPE170146,2014:1-6.
