针对辽河油田杜84块馆陶组油层SAGD开发存在顶水下窜风险,通过数值模拟与理论研究相结合的方式,研究顶水下窜对SAGD开发效果的影响,揭示了汽腔与顶水层沟通后汽腔发育程度、累计产油量、油汽比和汽腔压力的变化规律。在数值模拟研究的基础上,基于油藏中多相流体渗流和传热原理,建立了预测顶水下窜速率的理论模型。研究结果表明:当汽腔与顶水层沟通后,SAGD的累计产油量和油汽比将大幅下降,且顶水层压力越高,对SAGD生产效果的影响程度越大;在汽腔与顶水层之间维持一定的隔离段厚度是降低顶水对SAGD后期影响的最有效手段,在目前操作条件下,建议汽腔与顶水层之间的最小隔离段厚度为20 m。该研究为制订顶水稠油油藏SAGD操作技术界限提供了理论依据。
In response to the risk of downward channeling of top water in SAGD development of oil reservoirs in Guantao Formation, Block Du84, Liaohe Oilfield, the influence of the downward channeling of top water on the SAGD development effect was studied in combination with numerical modeling and theoretical studies to discover the changes in the development degree of steam chamber, cumulative oil production, oil-steam ratio and steam chamber pressure after the steam chamber is connected to the top water zone. On the basis of numerical modeling study, a theoretical model was established for predicting the channeling rate of the top water according to the principles of multiphase fluid seepage and heat transfer in oil reservoirs. The results of the study showed that the cumulative oil production and oil-steam ratio in SAGD production were decreased significantly after the steam chamber was connected to the top water zone, and the higher the pressure of the top water zone, the greater the influence on the production effect of SAGD; the most effective method of reducing the influence of top water on the later stage of SAGD was to maintain a certain isolator thickness between the steam chamber and the top water zone; therefore, the minimum isolator thickness is recommended to be 20 m between the steam chamber and top water zone under existing operating conditions. This study provides a theoretical basis for determining the technical limits of SAGD operation in heavy oil reservoirs with top water.
[1] Alberta Energy Regulator.Cnrl jackfish in situ project directive 54 annual performance presentation[EB/OL].(2019-11-01)[2022-01-07].https://www.aer.ca/documents/oilsands/insitu-presentations/2019 Athabasca CNRL Jackfish10097.pdf.
[2] Alberta Energy Regulator.Cenovus energy Inc.Foster Creek In-situ progress report scheme 8623 2018 update subsurface[EB/OL].(2019-03-15)[2022-01-07].https://www.aer.ca/providing-information/data-and-reports/activity-and-data/in-situ-performance-presentations.html.
[3] MILLER K A,XIAO Y.Improving the performance of classic SAGD with offsetting vertical producers[J].Journal of Canadian Petroleum Technology,2008,47(2):22-28.
[4] Alberta Energy Regulator.Conoco Phillips annual surmont SAGD performance review approval 9426[EB/OL].(2019-04-24)[2022-01-07].https://www.aer.ca/documents/oilsands/insitu-presentations/2019 Athabasca Conoco Surmont SAGD 94609426.pdf.
[5] WONG Yong,ALISON Ferrise,HUANG Yinghui.Study of temperature and pressure fall-off during shut-in and slow-down for SAGD wells with top water[C].SPE189720-MS,2018:1-10.
[6] NASR T N,LAW D H S,BEAULIEU G,et al.SAGD application in gas cap and top water oil reservoirs[J].Journal of Canadian Petroleum Technology,2003,42(1): 32-38.
[7] ALTURKL A,GATES I D,MAINI B.On SAGD in oil sands reservoirs with no caprock and top water zone[J].Journal of Petroleum Technology,2011,50(3):21-33.
[8] ALTURKL A,GATES I D,MAINI B.Co-Injection of non-condensable gas improves ES-SAGD performance in shallow oil sands reservoirs with a small top water zone[J].SPE137092,2010:1-17.
[9] BAO X,CHEN Z J,WEI Y,et al.Geostatisitical modeling and numerical simulation of the SAGD process[J].SPE137435,2010:1-20.
[10] ZHOU X,ZENG F.Feasibility study of using polymer to improve SAGD performance in oil sands with top water[C].SPE170164-MS,2014:1-22.
[11] QIN Wenting,ANDREWK Wojtanowicz,LI Hongwei.Improved thermal heavy oil recovery from strong bottom-water-drive reservoir by combining SAGD with downhole water sink[C].SPE172894-MS,2014:1-13.
[12] YEE C T,STROICH A.Flue gas injection into a mature SAGD steam chamber at the dover project (Formerly UTF)[J].Journal of Canadian Petroleum Technology,2004,43(1):54-61.
[13] Alberta Energy Regulator.Meg energy Christina Lake regional project[EB/OL].(2019-07-18)[2022-01-07].https://www.aer.ca/documents/oilsands/insitu-presentations/2019 MEG Christina Lake SAGD 10773.pdf.
[14] 王诗.氮气辅助SAGD在曙一区超稠油油藏的应用[J].中国石油和化工标准与质量,2017, 37(13):102-103.
WANG Shi.Application of nitrogen-assisted SAGD in ultra-heavy oil reservoirs in Block Shu 1[J].China Petroleum and Chemical Standard and Quality,2017,37(13):102-103.
[15] 刘振宇,张明波,周大胜.曙光油田杜84块馆陶超稠油油藏SAGP开发研究[J].特种油气藏, 2013,20(6):96-98.
LIU Zhenyu,ZHANG Mingbo,ZHOU Dasheng.Study on SAGP for guantao super heavy oil reservoir in Block Du84[J].Special Oil & Gas Reservoirs,2013,20(6):96-98.
[16] 辛坤烈.烟道气辅助SAGD技术研究与现场试验[J].中外能源, 2017, 22(7): 52-56.
XIN Kunlie.Study and field experiment of flue gas assisted SAGD[J].Sino-Global Energy,2017,22(7):52-56.
[17] BUTLER R M.Horizontal wells for the recovery of oil,Gas & Bitumen[M].Calgary:Topline Printing,1996:172-183.
[18] BUTLER R M.Thermal recovery of oil and bitumen[M].New Jersey:Prentice Hall Press,1991:504-505.
[19] LI Q,CHEN Z.A new analysis on the convective heat transfer at the edge of the SAGD chamber[C].SPE175063-MS,2015:1-21.
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