渤海B油田油井堵塞机理分析及防治对策研究  

Analysis on blocking mechanism and prevention measures for Bohai B oilfield

作　　者：方涛 白健华 尚宝兵 陈华兴 吴华晓 庞铭 FANG Tao;BAI Jianhua;SHANG Baobing;CHEN Huaxing;WU Huaxiao;PANG Ming(CNOOC China Ltd.,Tianjin Branch,Tianjin,300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《天然气与石油》2022年第5期75-80,共6页Natural Gas and Oil

基　　金：“十三五”国家科技重大专项“渤海油田高效开发示范工程”(2016ZX05058)。

摘　　要：针对渤海B油田D井区油井频繁堵塞、严重影响正常生产的问题,在堵塞物组分分析基础上,开展了沥青质沉积高压模拟等室内实验和蜡沉积、沥青质沉积相包络线理论预测,结果表明井筒存在蜡与沥青质复合沉积、近井地带存在沥青质沉积,温度和压力变化是导致有机质沉积的主要原因。为此,提出了“井筒升温+地层保压”相结合的治理策略。研发应用适合电潜泵井的井筒空心杆电加热工艺,井口温度提升至60℃以上;优化注采关系,将七采一注调整为五采三注,地层压力保持程度由最低72%增加至94%。2口因堵塞长期停产的油井恢复了正常生产,2口井产量有所上升,所有井没有再出现井筒堵塞现象,治理效果显著。研究成果为易发生蜡和沥青质沉积油田的高效开发提供了技术借鉴,具有指导意义。This paper is presented to address the issue of the frequent blockage in the D block of Bohai B oilfield,which seriously affected its normal production.Based on the composition analysis of blockage,some laboratory experiments,such as high-pressure simulation of asphaltene deposition,and theoretical prediction of wax deposition and asphaltene deposition phase envelope were carried out.The results showed that there existed a combination of wax deposition and asphaltene deposition in wellbore and asphaltene deposition around near-well zone.Temperature and pressure changes were the main causes.And for that,the treatment strategy of increasing temperature in wellbore and maintaining pressure in formation was proposed.To increase the temperature,the hollow rod electric heating technology suitable for electric submersible pump(ESP)wells was introduced,and the wellhead temperature was raised to above 60℃.In order to maintain pressure,the injection-production system was optimized as well.The injection-production system of 7 production wells with 1 injection wells turned into 5 production wells with 3 injection wells and the formation pressure increased from the lowest 72%of the original formation pressure to 94%of that.Two wells that had been shut down for a long time due to blockage in wellbore have resumed normal production,and another two wells produce more than before.No blockage in wellbore occurs again,proving that a remarkable effect is achieved.The research can provide technical reference for the efficient development of oilfields prone to wax and asphaltene deposition,and has important guiding significance.

关 键 词：蜡沉积 沥青质沉积 电潜泵井 空心杆电加热 保压开采 注采调整 

分 类 号：TE53[石油与天然气工程—油气田开发工程]