彭东宇,唐洪明,山金城,郑举,赵峰.PL19-9油田注水过程中损害机理研究[J].地质找矿论丛,2020,35(2):187-196
PL19-9油田注水过程中损害机理研究
Study on damage mechanism during water injection in PL19-9 Oilfield
投稿时间:2019-09-17  
DOI:10.6053/j.issn.1001-1412.2020.02.008
中文关键词:  疏松砂岩  配伍性  敏感性  注水水质  PL19-9油田
英文关键词:loose sandstone  compatibility  sensitivity  quality of the injected water  PL19-9 Oilfield
基金项目:
作者单位
彭东宇 西南石油大学地球科学与技术学院, 成都 610500 
唐洪明 西南石油大学地球科学与技术学院, 成都 610500 
山金城 中海石油(中国)有限公司天津分公司, 天津 塘沽 300452 
郑举 中海石油(中国)有限公司天津分公司, 天津 塘沽 300452 
赵峰 西南石油大学地球科学与技术学院, 成都 610500 
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中文摘要:
      PL19-9油田是典型的疏松砂岩稠油油藏,其正式投入开发不久后,与PL19-3设计注水量相比,暴露出注入压力高、油井欠注等一系列问题,原油产量明显下降。本文在深化研究该油田储层地质特征的基础上,利用储层敏感性矿物分析、配伍性实验、电镜能谱、X射线衍射、红外光谱分析、室内岩芯驱替、平台水质调研等手段,明确了注水过程中储层损害机理。研究结果表明:PL19-9油田岩石胶结疏松、黏土矿物含量高、层间非均质性强是注水困难的客观因素;储层具有强速敏,注入强度过大是影响注水效果的重要原因;注入水与地层水存在轻度不配伍,不配伍比例在3∶1—1∶3之间;注入40 PV时损害程度为中等偏弱;水质不达标是注水困难的关键外因,注入水中对储层造成伤害的物质主要为油污、腐蚀产物,其次为少量垢和地层颗粒。针对上述损害机理采取相应的措施,提高注水井的吸水能力,保证注采平衡,促进高效稳产。
英文摘要:
      Unconsolidated sandstone heavy oil reservoir is typical in PL19-9 oilfield. Shortly after its formal development, PL19-9 oilfield is exposed to a series of problems, such as high injection pressure, underinjection of oil wells, and significant decrease of the crude oil production compared with the original design. On the basis of deepening the study of reservoir geological characteristics of this oilfield, the mechanism of reservoir damage during water injection is clarified by means of reservoir sensitivity mineral analysis, compatibility experiment, electron microscopic energy spectrum, XRD, infrared spectrum analysis, indoor core displacement and platform water quality investigation. The results show that loose rock cementation, high clay mineral content and strong interlayer heterogeneity are the objective factors for difficult water injection; strong sensitivity to flow speed of reservoir and excessive injection intensity are the important reasons affecting water injection effect; slight incompatibility occurs between the injected and formation water, and the proportion of incompatibility is between 3∶1 and 1∶3; When 40 PV is used, the damage is medium and weak, the key external cause of the difficult injection is the understandarized water quality, dirt oil, corrosion products and a small amount of scale and formation particles lead to damage of the reservoir. Therefore, corresponding measures such as improving the water absorption capacity of wells, keeping injection-production balance should be taken to promote high efficiency and stable production.
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