多级架桥暂堵储层保护技术及其应用效果评价——以四川盆地磨溪—高石梯构造龙王庙组储层为例
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摘要
四川盆地磨溪—高石梯构造下寒武统龙王庙组储层具有巨大的开发潜力,属于裂隙一孔隙型储层,已有的研究成果表明,该类型储层容易受到碱敏、水锁及固相粒子的损害。为此,在对磨溪—高石梯构造龙王庙组储层特征分析基础上,评价了龙王庙组储层潜在损害因素:水敏、碱敏、速敏、应力敏感,并依据孔喉渗透率贡献率的多峰分布理论,提出了多级架桥屏蔽暂堵储层保护技术。通过室内实验优选出了多级架桥暂堵钻井完井液配方,评价了加入多级架桥暂堵剂前后对钻井液性能及对岩心渗透率恢复值的影响,并在该区20口井次进行了现场试验。结果表明:多级架桥暂堵材料对井浆性能影响小,所用的多级架桥暂堵钻井完井液室内岩心渗透率恢复值达80%以上,平均储层岩心渗透率恢复率由实施前的65%提高至84.5%,具有较好的储层保护效果。
As a fracture-pore reservoir,the Longwangmiao Formation in the Moxi-Gaoshiti structure,Sichuan Basin,has great development potentials.Previous studies suggest that the reservoir is vulnerable to alkali sensitivity,water lock and the damage of solid particles.Therefore,through an analysis of the characteristics of the Longwangmiao Fm reservoir,potential damage factors for the reservoir were evaluated,including water sensitivity,alkali sensitivity,velocity sensitivity and stress sensitivity.According to the multi-peak distribution theory of contribution rates to pore throat permeability,the multi-stage bridge plugging reservoir protection technology was proposed.Through lab experiments,an optimal formulation of multi-stage bridge temporary-plugging drilling completion fluid was identified.In addition,impacts of the multi-stage bridge plugging agent on drilling fluid properties and core permeability recovery rate were evaluated.This agent was applied in 20 wells in the field.The results show that the multi-stage bridge temporary-plugging agent has minor impacts on the performance of drilling fluids with lab core permeability recovery rates of more than80%,and average permeability recovery rates of reservoir cores increased from 65%to 84.5%.In summary,this agent has a better performance of reservoir protection.
As a fracture-pore reservoir,the Longwangmiao Formation in the Moxi-Gaoshiti structure,Sichuan Basin,has great development potentials.Previous studies suggest that the reservoir is vulnerable to alkali sensitivity,water lock and the damage of solid particles.Therefore,through an analysis of the characteristics of the Longwangmiao Fm reservoir,potential damage factors for the reservoir were evaluated,including water sensitivity,alkali sensitivity,velocity sensitivity and stress sensitivity.According to the multi-peak distribution theory of contribution rates to pore throat permeability,the multi-stage bridge plugging reservoir protection technology was proposed.Through lab experiments,an optimal formulation of multi-stage bridge temporary-plugging drilling completion fluid was identified.In addition,impacts of the multi-stage bridge plugging agent on drilling fluid properties and core permeability recovery rate were evaluated.This agent was applied in 20 wells in the field.The results show that the multi-stage bridge temporary-plugging agent has minor impacts on the performance of drilling fluids with lab core permeability recovery rates of more than80%,and average permeability recovery rates of reservoir cores increased from 65%to 84.5%.In summary,this agent has a better performance of reservoir protection.
引文
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[12]张琰,崔迎春.屏蔽暂堵分形理论与应用研究[J].天然气工业,2000,20(6):54-56.Zhang Yan,Cui Yingchun.Temporary plugging fractal theory and its application study[J].Natural Gas Industry,2000,20(6):54-56.
[2]徐春春,沈平,杨跃明,罗冰,黄建章,江兴福,等.乐山—龙女寺古隆起震旦系—下寒武统龙王庙组天然气成藏条件与富集规律[J].天然气工业,2014,34(3):1-7.Xu Chunchun,Shen Ping,Yang Yueming,Luo Bing,Huang Jianzhang,Jiang Xingfu,et al.Accumulation conditions and enrichment patterns of natural gas in the Lower Cambrian Longwangmiao Fm reservoirs of the LeshanLongnusi Paleohigh,Sichuan Basin[J].Natural Gas Industry,2014,34(3):1-7.
[3]张绍槐,罗平亚.保护储集层技术[M].北京:石油工业出版社,1993.Zhang Shaohuai,Luo Pingya.Reservoir protection technology[M].Beijing:Petroleum Industry Press,1993.
[4]李志刚,乌效鸣,郝蜀民,熊汉桥,邢振辉,付胜利.采用屏蔽暂堵技术保护油气层[J].天然气工业,2005,25(3):8-13.Li Zhigang,Wu Xiaoming,Hao Shumin,Xiong Hanqiao,Xing Zhenhui,Fu Shengli.Protecting reservoir of using shielding temporary plugging technology[J].Natural Gas Industry,2005,25(3):8-13.
[5]李克向.保护油气层概念与技术[J].石油钻采工艺,2000,22(5):1-5.Li Kexiang.Conception and technology of protecting reservoir[J].Oil Drilling&Production Technology,2000,22(5):1-5.
[6]赵凤兰,鄢捷年.国外保护油气层技术新进展——关于油气层损害机理的研究[J].钻井液与完井液,2003,20(2):42-47.Zhao Fenglan,Yan Jienian.Advances in formation damage control technology abroad—investigations on the mechanisms of formation damage[J].Drilling Fluid&Completion Fluid,2003,20(2):42-47.
[7]鄢捷年,黄林基.钻井液优化设计与实用技术[M].东营:石油大学出版社,1993.Yan Jienian,Huang Linji.Drilling fluid optimization with practical technology[M].Dongying:Petroleum University Press,1993.
[8]李志勇,鄢捷年,沙东,余维初,张金波.大港油田保护储层暂堵剂优化设计新方法[J].天然气工业,2007,27(10):79-81.Li Zhiyong,Yan Jienian,Sha Dong,Yu Weichu,Zhang Jinbo.A new optimization design method for reservoir protecting temporary plugging agent used in Dagang oilfield[J].Natural Gas Industry,2007,27(10):79-81.
[9]张凤英,鄢捷年,李志勇.钻井过程中暂堵剂颗粒尺寸优选研究[J].西南石油大学学报:自然科学版,2011,33(3):130-132.Zhang Fengying,Yan Jienian,Li Zhiyong.The application of optimizing particle size of grain blocking agents in the drilling process[J].Journal of Southwest Petroleum University:Science&Technology Edition,2011,33(3)-130-132.
[10]王利国,鄢捷年,冯文强.理想充填暂堵型钻井完井液的设计及室内评价[J].中国石油大学学报:自然科学版,2007,31(3):72-76.Wang Liguo,Yan Jienian,Feng Wenqiang.Design and lab evaluation of ideal packing bridging drilling and completion fluids[J].Journal of China University of Petroleum:Edition of Natural Science,2007,31(3):72-76.
[11]张金波,鄢捷年,赵海燕.优选暂堵剂粒度分布的新方法[J].钻井液与完井液,2004,21(5):4-7.Zhang Jinbo,Yan Jienian,Zhao Haiyan.Optimization of bridging particle size distribution of drilling fluid for formation protection[J].Drilling Fluid&Completion Fluid,2004,21(5):4-7.
[12]张琰,崔迎春.屏蔽暂堵分形理论与应用研究[J].天然气工业,2000,20(6):54-56.Zhang Yan,Cui Yingchun.Temporary plugging fractal theory and its application study[J].Natural Gas Industry,2000,20(6):54-56.
目录