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深层高压低渗透砂岩油藏储层应力敏感性模型及开发指标变化规律——以文东油田为例
许寻,李中超,刘广英,王瑞飞,李群星,刘云利,杨胜勇
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(1.中国石化中原油田分公司勘探开发研究院,河南濮阳457001;2.中国石化华北油气分公司工程技术研究院,河南郑州450006;3.西安石油大学陕西省油气井及储层渗流与岩石力学重点实验室,陕西西安710065;4.西安石油大学石油工程学院,陕西西安710065;5.中国石油新疆油田公司风城油田作业区,新疆克拉玛依834000)
摘要:
针对深层高压低渗透砂岩油藏储层地质特征复杂、应力敏感性严重的特点,开展储层应力敏感性模型及开发指标变化规律研究。通过室内实验及现场数据分析注水开发过程中因储层孔隙流体压力降低而产生的应力敏感性对采油指数、采液指数、吸水指数的影响;建立渗透率、孔隙度、采油指数、采液指数、吸水指数的应力敏感性模型,归纳采油指数、采液指数、吸水指数应力敏感性的控制因素。研究发现,文东油田深层高压低渗透砂岩油藏开发中,采油指数、采液指数逐渐减小,且采油指数递减速率大于采液指数递减速率,吸水指数逐渐增大;影响采油指数、采液指数变化的因素主要有油水黏度比、启动压力梯度和含水率。
关键词:  深层高压低渗透砂岩油藏  应力敏感性评价模型  采油指数  采液指数  吸水指数
DOI:10.13673/j.cnki.cn37-1359/te.2020.06.015
基金项目:中国石化科技攻关项目“东濮高压低渗油藏改善气驱效果关键技术(P17003-4)”和“气藏型储气库方案优化设计研究(P18096-2)”。
Stress sensitivity model and development index trend in deep high-pressure and low-permeability sandstone reservoirs:A case study of Wendong Oilfield
XU Xun,LI Zhongchao,LIU Guangying,WANG Ruifei,LI Qunxing,LIU Yunli,YANG Shengyong
(1.Exploration and Development Research Institute,Zhongyuan Oilfield Company,SINOPEC,Puyang City,Henan Province,457001,China;2.Research Institute of Engineering and Technology,Huabei Company,SINOPEC,Zhengzhou City,Henan Province,450006,China;3.Shaanxi Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas Reservoirs,Xi’an Shiyou University,Xi’an City,Shaanxi Province,710065,China;4.College of Petroleum Engineering,Xi’an Shiyou University,Xi’an City,Shaanxi Province,710065,China;5.Fengcheng Oilfield Operation Area,Xinjiang Oilfield Company,CNPC,Karamay,Xinjiang,834000,China)
Abstract:
In view of the complex geological characteristics and strong stress sensitivity of deep high-pressure and low-permeability sandstone reservoirs,the stress sensitivity model and development index trend were studied. The effects of stress sensitivity due to the reduction of pore fluid pressure on oil productivity index,fluid productivity index,and water absorption index were analyzed through laboratory tests and field data. The stress sensitivity models of permeability,porosity,oil productivity index,fluid productivity index and water absorption index were established to generalize the controlling factors of the stress sensitivity of oil productivity index,fluid productivity index and water absorption index. It is found that in the development of deep high-pressure and low-permeability reservoirs in Wendong Oilfield,the water absorption index gradually rose while the oil productivity index and the fluid productivity index smoothly fell. The oil productivity index dropped at a higher rate than that of the fluid productivity index. The main controlling factors of oil productivity index and fluid productivity index include the oil-water viscosity ratio,starting pressure gradient and water cut.
Key words:  deep high-pressure and low-permeability sandstone reservoirs  stress sensitivity model  oil productivity index  fluid productivity index  water absorption index

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