文章摘要
南海海相砂岩底水油藏水平井开发见水规律研究
Research on waterflooding law of horizontal wells in marine sandstone reservoirs with bottom water in South China Sea
投稿时间:2019-09-11  修订日期:2019-09-11
DOI:
中文关键词: 海相砂岩油藏  底水油藏  水平井  见水规律  数值模拟
英文关键词: marine sandstone reservoirs  bottom water reservoirs  horizontal well  waterflooding law  numerical simulation
基金项目:国家科技重大专项课题“海上油田化学驱油技术”(2016ZX05025-003)
作者单位E-mail
王全 中海油研究总院有限责任公司 wangquan0602@126.com 
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中文摘要:
      海相砂岩底水油藏在南海珠江口盆地储量丰富,采用水平井天然水驱的开发方式取得了良好的开发效果。水平井开发面临的核心问题是底水脊进,如何准确把握水平井的见水位置及见水规律是后期有针对性的采取增产措施,进一步提高开发效果的关键。研究发现,对于典型海相砂岩底水油藏水平井,井筒沿程压降相对于生产压差数值较小,其对见水规律的影响也较小。以数值模拟技术为手段,分类分析了影响见水规律的主要因素,不同因素的影响程度不同,避水高度差异、夹层发育状况、油藏平面非均质性、井筒直径对见水规律的影响较大,前两者是较均质的南海海相砂岩油藏应重点关注的主控因素。在此基础上,结合实际生产动态,将该类油藏水平井见水规律总结为三种模式:线性整体见水、多点见水及点状局部见水。见水模式的研究和总结可为开发后期水平井稳油控水政策的制定提供参考。
英文摘要:
      The reserves of marine sandstone reservoirs with bottom water are rich in Pearl River Mouth Basin of South China Sea. The development model of natural water flooding by horizontal wells has achieved good results. Bottom water coning is the core problem faced by reservoir development. How to grasp the location of water seepage and the law of water breakthrough in horizontal wells accurately is the key to adopting measures for increasing production and further improving development results in the later period. Research shows that the pressure drop along the wellbore is relatively small compared to the producing pressure drop, and its effect on the waterflooding law of a horizontal well is also small for typical marine sandstone reservoirs with bottom water. Using numerical simulation techniques, the main factors affecting the waterflooding law are classified and analyzed. The influence of different factors is different. The areal heterogeneity of the reservoir, the difference in the height of water avoidance, the development status of interlayer, and the wellbore diameter have a greaer influence on the waterflooding law. The first two factors are the main controlling factors that should be focused on. Based on this and combining with the actual production dynamics, the waterflooding law of horizontal wells in this type of reservoirs is summarized into three modes, including linear breakthrough waterflooding in the whole horizontal section, punctiform breakthrough waterflooding in several horizontal sections, and punctiform breakthrough waterflooding in the local horizontal section. The study and summary of the waterflooding modes can provide reference for the formulation of policy stabilizing oil production and controlling water cut for horizontal wells in the later development period.
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