QK18-1油田注水开发储层损害研究

发布时间：2018-04-17 03:15

本文选题：注水开发 + 结垢　；参考：《油田化学》2017年03期

【摘要】：QK18-1油田沙河街组油藏注水开发近20年,目前75%以上的油井欠注,油田经济效率低。为明确储层损害机理、建立提高油田注水井吸水能力的有效方法,通过室内静态配伍性实验、水敏性评价实验和水质调研结果,结合铸体薄片和电子显微镜照片对比了探井和开发井储层岩心的微观地质特征,分析了该油田注水困难的原因。结果表明,储层损害的关键因素是混合污水与地层水不配伍形成粒径为10~30μm的CaCO_3垢,在储层中呈菱面体、自形程度高的CaCO_3垢晶呈颗粒状分布在孔隙中及喉道处导致储层物性降低;混合污水矿化度低,回注引发水敏损害。水处理系统悬浮物含量超标也是影响注水效果的重要因素。针对油田注水开发中储层损害问题,提出了预防措施和建议,以提高注水井吸水能力,保证油田注采平衡。
[Abstract]:Water injection development of Shahejie formation reservoir in QK18-1 oilfield is nearly 20 years. At present, more than 75% of oil wells are under injection, and the economic efficiency of oil field is low.In order to clarify the mechanism of reservoir damage and establish an effective method to improve the water absorption ability of water injection wells in oil fields, the results of laboratory static compatibility experiment, water sensitivity evaluation experiment and water quality investigation were carried out.The microcosmic geological characteristics of reservoir cores in exploration wells and development wells are compared with the photographs of casting thin plates and electron microscope. The reasons for the difficulty of water injection in this oilfield are analyzed.The results show that the key factor of reservoir damage is that mixed sewage does not match with formation water to form CaCO_3 scale of 1030 渭 m diameter, rhombohedral is formed in reservoir, and CaCO_3 scale crystal with high degree of self shape distributes in pore and throat, which results in the decrease of reservoir physical property.The mixed sewage has low salinity and water sensitivity damage caused by the reinjection.The content of suspended matter in water treatment system is also an important factor affecting the water injection effect.In view of reservoir damage in oilfield water injection development, preventive measures and suggestions are put forward in order to improve water absorption capacity of water injection wells and ensure injection-production balance in oil fields.
【作者单位】：中海石油(中国)有限公司天津分公司;西南石油大学地球科学与技术学院;中国石化西南油气分公司;
【基金】：“十三五”国家科技重大专项示范工程58“渤海油田高效开发示范工程”(项目编号2016ZX05058)
【分类号】：TE258;TE357.6

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