延长油田特低渗油藏适度温和注水方法与应用

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摘要为解决裂缝性特低渗油藏注水开发水窜、水淹问题,提高水驱开发效果,以延长油田南部地区长8油藏为研究对象,建立了裂缝-基质动态渗吸室内实验评价方法,确定了制约渗吸效果的关键因素,获得了渗吸速度的数学表达式,建立了考虑渗吸-驱替双重作用的渗流数学模型,确定了研究区最佳注采参数。研究表明,水驱油过程存在使渗吸驱油效率达到最高的最佳驱替速度,且随着渗透率的降低最佳驱替速度变小;储集层品质指数和岩石水相润湿指数越大,渗吸驱油效率越高,而初始含水饱和度、油水黏度比越大,渗吸驱油效率越低;延长油田南部长8特低渗油藏最佳注采比为0.95,含水率95%时预测的水驱采出程度为17.2%,较常规注水（注采比1.2）增加2.9个百分点。充分发挥渗吸-驱替双重作用的“适度温和”注水技术可显著提高裂缝性特低渗油藏注水开发效果。图11表2参28

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	王香增
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关键词 ：特低渗油藏, 裂缝性油藏, 注水开发, 渗吸, 驱替, 水驱采收率, 延长油田

Abstract：To explore the method of improving development effect and solving the problem of water breakthrough and water out for ultralow permeability fractured reservoirs, an indoor evaluation method of dynamic imbibition for fracture-matrix system was established taking the Chang 8 reservoir in southern Yanchang Oilfield as a research target. Key factors for the imbibition effect were obtained, an imbibition’s rate expression was obtained, a model considering the double effects of imbibition-displacement was built, and optimal injection and production parameters for the research area was obtained as well. The results show that: An optimum displacement rate that maximizes the oil displacement efficiency exists in the water displacing oil process, and the optimal displacing rate becomes small as the permeability decreases. The imbibitions displacement efficiency increases as the reservoir quality index and water wettability index of rock become big. But the larger the initial water saturation or oil-water viscosity ratio is, the smaller the imbibitions displacement efficiency is; The optimal injection-production ratio for the Chang 8 reservoir of southern Yanchang Oilfield is 0.95, and the predicted recovery is 17.2% when the water cut is95%, it is 2.9% higher than the recovery of conventional injection-production ratio 1.2. By using the moderate water injection technique based on the double effects of imbibition-displacement mechanism, the water injection development effect for the ultralow permeability fractured reservoirs can be improved significantly.

Key words： ultra-low permeability oil reservoir fractured oil reservoir water-flooding imbibition displacement water-flooding recovery Yanchang Oilfield

收稿日期: 2018-05-07 出版日期: 2018-10-09

PACS:

TE33

基金资助:陕西省科技统筹创新项目“延长难采储量有效动用开发技术研究”（2016KTCL01-12）

作者简介: 王香增（1968-）,男,河南滑县人,博士,陕西延长石油（集团）有限责任公司教授级高级工程师,主要从事特低渗油气开采工程技术研究工作。地址：陕西省西安市高新区科技二路,陕西延长石油（集团）有限责任公司,邮政编码：710075。E-mail：sxycpcwxz@126.com

引用本文:

王香增, 党海龙, 高涛. 延长油田特低渗油藏适度温和注水方法与应用[J]. 石油勘探与开发, 0, (): 2018110-2018109.
WANG Xiangzeng, DANG Hailong, GAO Tao. Method of moderate water injection and its application in ultra-low permeability oil reservoirs of Yanchang Oilfield, NW China[J]. Petroleum Exploration and Development, 0, (): 2018110-2018109.

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http://www.cpedm.com/CN/ 或 http://www.cpedm.com/CN/Y0/V/I/2018110

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