威远区块深层页岩气水平井水基钻井液技术
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摘要
为解决威远区块深层页岩气水平井长水平段井眼失稳的问题,研制了具有强抑制性、强封堵能力的水基钻井液。分析了威远区块页岩储层矿物组分、储层物性和页岩地层井眼失稳机理,认为在该地层钻进水平段时,所用钻井液应具有较强的抑制性、封堵能力和一定的润滑性。在优选抑制剂、封堵剂和润滑剂的基础上,配制了深层页岩气水平井水基钻井液SM–ShaleMud,并对其性能进行了室内评价。室内试验结果表明:该钻井液流变性能好,高温高压滤失量低,润滑系数小;可抗温140℃,能有效抑制黏土水化和裂缝的产生、扩展;封堵能力和抗污染能力强。SM–ShaleMud水基钻井液在威远区块威页23平台3口井进行了应用,结果表明具有良好的综合性能,特别是井眼浸泡67 d后仍保持稳定,说明其具有强抑制性和强封堵能力。研究表明,SM–ShaleMud水基钻井液能够解决威远区块深层页岩气水平井长水平段井眼失稳问题,现场应用效果显著。
In order to solve the problem of wellbore instability in the horizontal section of deep shale gas horizontal wells in Block Weiyuan, a water based drilling fluid with strong inhibition and plugging capacity was developed. Through analysis on mineral composition, reservoir physical properties and wellbore instability mechanism in shale formation in Weiyuan Block, it was believed that the drilling fluid used in horizontal wells of this formation should have good performance in terms of inhibition, plugging and lubricity. The SM-ShaleMud water based drilling fluid suitable for deep shale gas horizontal wells was prepared by optimizing and selecting proper inhibitors, plugging agents and lubricants,, and the lab tests were conducted to evaluate its performance. The lab evaluation results showed that this drilling fluid had good rheological properties, high temperature high pressure(HTHP) fluid loss and low lubrication coefficient; SM-ShaleMud had temperature-resistance up to 140 °C, and presented good performance in inhibiting clay hydration and the generation and extension of fractures; this fluid system had been applied in three wells of Weiye 23 Platform in Weiyuan District, and achieved an excellent application effect. One point had to be stated that it ensured the wellbore stability after being soaked for 67 days, indicating the strong inhibition and plugging capacity.Research suggested that this water based drilling fluid system could solve the problem of wellbore instability in long horizontal section, and achieve a significant application effect, thereby demonstrating a good application prospective.
In order to solve the problem of wellbore instability in the horizontal section of deep shale gas horizontal wells in Block Weiyuan, a water based drilling fluid with strong inhibition and plugging capacity was developed. Through analysis on mineral composition, reservoir physical properties and wellbore instability mechanism in shale formation in Weiyuan Block, it was believed that the drilling fluid used in horizontal wells of this formation should have good performance in terms of inhibition, plugging and lubricity. The SM-ShaleMud water based drilling fluid suitable for deep shale gas horizontal wells was prepared by optimizing and selecting proper inhibitors, plugging agents and lubricants,, and the lab tests were conducted to evaluate its performance. The lab evaluation results showed that this drilling fluid had good rheological properties, high temperature high pressure(HTHP) fluid loss and low lubrication coefficient; SM-ShaleMud had temperature-resistance up to 140 °C, and presented good performance in inhibiting clay hydration and the generation and extension of fractures; this fluid system had been applied in three wells of Weiye 23 Platform in Weiyuan District, and achieved an excellent application effect. One point had to be stated that it ensured the wellbore stability after being soaked for 67 days, indicating the strong inhibition and plugging capacity.Research suggested that this water based drilling fluid system could solve the problem of wellbore instability in long horizontal section, and achieve a significant application effect, thereby demonstrating a good application prospective.
引文
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[10]刘洋洋,邓明毅,谢刚,等.基于压力传递的钻井液纳米封堵剂研究与应用[J].钻井液与完井液,2017,34(6):24-28,34.LIU Yangyang,DENG Mingyi,XIE Gang,et al.Study and application of a drilling fluid plugging agent based on pressure transfer inhibition[J].Drilling Fluid&Completion Fluid,2017,34(6):24-28,34.
[11]钟汉毅,黄维安,林永学,等.新型聚胺页岩抑制剂性能评价[J].石油钻探技术,2011,39(6):44-48.ZHONG Hanyi,HUANG Weian,LIN Yongxue,et al.Properties evaluation of a novel polyamine shale inhibitor[J].Petroleum Drilling Techniques,2011,39(6):44-48.
[12]王琳,董晓强,杨小华,等.高密度钻井液用润滑剂SMJH-1的研制及性能评价[J].钻井液与完井液,2016,33(1):28-32.WANG Lin,DONG Xiaoqiang,YANG Xiaohua,et al.Development and evaluation of a high density drilling fluid lubricant[J].Drilling Fluid&Completion Fluid,2016,33(1):28-32.
[2]高书阳,豆宁辉,林永学,等.川渝地区龙马溪组页岩储层水化特征评价方法[J].石油钻探技术,2018,46(3):20-26.GAO Shuyang,DOU Ninghui,LIN Yongxue,et al.A new method for evaluating the characteristics of hydration in the Longmaxi Shale Gas Reservoir in Sichuan-Chongqing Area[J].Petroleum Drilling Techniques,2018,46(3):20-26.
[3]林永学,高书阳,曾义金.龙马溪组页岩强度评价与分析[J].石油钻探技术,2015,43(5):20-25.LIN Yongxue,GAO Shuyang,ZENG Yijin.Evaluation and analysis of rock strength for the Longmaxi Shale[J].Petroleum Drilling Techniques,2015,43(5):20-25.
[4]张国仿.涪陵页岩气田低黏低切聚合物防塌水基钻井液研制及现场试验[J].石油钻探技术,2016,44(2):22-27.ZHANG Guofang.The development and field testing of low viscosity and low gel strength polymer collapse-resistant waterbased drilling fluid in the Fuling Shale Gas Field[J].Petroleum Drilling Techniques,2016,44(2):22-27.
[5]谭秀华,熊鑫,曾强渗.渝东南地区页岩气钻井泥浆优化技术[J].重庆科技学院学报(自然科学版),2018,20(1):67-70.TAN Xiuhua,XIONG Xin,ZENG Qiangshen.Optimization technology of shale gas drilling mud in Southeast Chongqing[J].Journal of Chongqing University of Science and Technology(Natural Sciences Edition),2018,20(1):67-70.
[6]王中华.页岩气水平井钻井液技术的难点及选用原则[J].中外能源,2012,17(4):43-47.WANG Zhonghua.Difficulty and applicable principle of the drilling fluid technology of horizontal wells for shale gas[J].Sino-Global Energy,2012,17(4):43-47.
[7]王光兵,刘向君,梁利喜.硬脆性页岩水化的超声波透射实验研究[J].科学技术与工程,2017,17(36):60-66.WANG Guangbing,LIU Xiangjun,LIANG Lixi.Ultrasonic transmission experimental investigation on hydration of hard brittle shale[J].Science Technology and Engineering,2017,17(36):60-66.
[8]罗诚,吴婷,朱哲显.硬脆性泥页岩井壁稳定性研究[J].西部探矿工程,2013,25(6):50-52.LUO Cheng,WU Ting,ZHU Zhexian.Study on the wellbore stability of hard brittle shale[J].West-China Exploration Engineering,2013,25(6):50-52.
[9]丁乙,张安东.川南龙马溪页岩地层井壁失稳实验研究[J].科学技术与工程,2014,14(15):25-28,42.DING Yi,ZHANG Andong.Experiment research of borehole instability of shale in Longmaxi Formation of South Sichuan[J].Science Technology and Engineering,2014,14(15):25-28,42.
[10]刘洋洋,邓明毅,谢刚,等.基于压力传递的钻井液纳米封堵剂研究与应用[J].钻井液与完井液,2017,34(6):24-28,34.LIU Yangyang,DENG Mingyi,XIE Gang,et al.Study and application of a drilling fluid plugging agent based on pressure transfer inhibition[J].Drilling Fluid&Completion Fluid,2017,34(6):24-28,34.
[11]钟汉毅,黄维安,林永学,等.新型聚胺页岩抑制剂性能评价[J].石油钻探技术,2011,39(6):44-48.ZHONG Hanyi,HUANG Weian,LIN Yongxue,et al.Properties evaluation of a novel polyamine shale inhibitor[J].Petroleum Drilling Techniques,2011,39(6):44-48.
[12]王琳,董晓强,杨小华,等.高密度钻井液用润滑剂SMJH-1的研制及性能评价[J].钻井液与完井液,2016,33(1):28-32.WANG Lin,DONG Xiaoqiang,YANG Xiaohua,et al.Development and evaluation of a high density drilling fluid lubricant[J].Drilling Fluid&Completion Fluid,2016,33(1):28-32.
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