东海油气田深部泥页岩特性及钻井液技术研究
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摘要
针对东海油气田从玉泉组到平湖组钻井过程经常出现剥落掉块导致蹩钻、蹩扭矩、起下钻遇阻等问题,开展了东海油气田泥页岩特性及钻井液技术研究,研究中采用了X射线衍射、理化性能测试、扫描电镜以及高压压汞分析了东海地区泥页岩井壁失稳的机理,提出了纳微米微孔封堵和活度平衡的钻井液技术对策,获得了一套适合于东海油气田深层泥页岩井壁稳定的海上反渗透型钻井液技术并开展了室内评价和现场应用,应用井与邻井相比,121/4"井段划眼时间从137.75 h减少到39.50 h,循环时间从56.75 h减少到35.75 h,单井划眼和循环时间节约近5 d。
In view of the frequent occurrence of problems such as bit-bouncing,torque distortion,and tripping resistance caused by peeling and chipping during drilling operations across the Yuquan and Pinghu formations of the oil and gas fields of the East China Sea,the present study investigates the characteristics of mud shale and drilling fluid techniques in the oil and gas fields of the East China Sea.X-ray diffraction,physical and chemical property tests,scanning electron microscopy,and high-pressure mercury inj ection were adopted to analyze the mechanisms of borehole destabilization in the mud shales of the East China Sea area.Based on these analyses,nano/micro pore sealing and balanced activity drilling fluid techniques were proposed to resolve the aforementioned issues.On this basis,a set of offshore reverse-osmosis-based drilling fluid techniques suitable for stabilizing deep mud shale borehole walls in oil and gas fields were developed for the East China Sea.Laboratory evaluations and field applications of these techniques were performed,and it was observed that compared with a neighboring well,the reaming time of the experimental well of size 121/4" decreased from 137.75 h to 39.50 h and the circulation time decreased from 56.75 h to 35.75 h,resulting in time savings of close to 5 d for reaming and circulation for a single well.
In view of the frequent occurrence of problems such as bit-bouncing,torque distortion,and tripping resistance caused by peeling and chipping during drilling operations across the Yuquan and Pinghu formations of the oil and gas fields of the East China Sea,the present study investigates the characteristics of mud shale and drilling fluid techniques in the oil and gas fields of the East China Sea.X-ray diffraction,physical and chemical property tests,scanning electron microscopy,and high-pressure mercury inj ection were adopted to analyze the mechanisms of borehole destabilization in the mud shales of the East China Sea area.Based on these analyses,nano/micro pore sealing and balanced activity drilling fluid techniques were proposed to resolve the aforementioned issues.On this basis,a set of offshore reverse-osmosis-based drilling fluid techniques suitable for stabilizing deep mud shale borehole walls in oil and gas fields were developed for the East China Sea.Laboratory evaluations and field applications of these techniques were performed,and it was observed that compared with a neighboring well,the reaming time of the experimental well of size 121/4" decreased from 137.75 h to 39.50 h and the circulation time decreased from 56.75 h to 35.75 h,resulting in time savings of close to 5 d for reaming and circulation for a single well.
引文
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[2]张海山.东海地区低孔低渗储层低自由水钻井液体系研究与应用[J].中国海上油气,2013,25(2):71-73.ZHANG Haishan.The research and application of low free water drilling fluid system in the low porosity and low permeability reservoirs in the East China Sea[J].China Offshore Oil and Gas,2013,25(2):71-73.
[3]唐广荣,赵峰,李跃林.东方1-1气田低渗疏松砂岩气藏伤害机理研究[J].西南石油大学学报(自然科学版),2015,37(3):103-108.TANG Guangrong,ZHAO Feng,LI Yuelin.An experimental study on reservoir damage mechanisms of DF1-1low permeability loose sandstone gas reservoir[J].Journal of Southwest Petroleum University(Science&Technology Edition),2015,37(3):103-108.
[4]张海山,蔡斌,刘永兵,等.东海某区块致密砂岩钻井液侵入深度实验研究[J].西南石油大学学报(自然科学版),2017,39(4):152-158.doi:10.11885/j.issn.1674-5086.2015.11.02.01ZHANG Haishan,CAI Bin,LIU Yongbing,et al.Experimental study on penetration depth of drilling fluid into tight sandstone in an area of the East China Sea[J].Journal of Southwest Petroleum University(Science&Technology Edition),2017,39(4):152-158.doi:10.11885i/j.issn.-1674-5086.2015.11.02.01
[5]徐同台,熊友明,康毅力,等.保护油气层技术[M].北京:石油工业出版社,2010.
[6]徐同台.油气田地层特性与钻井液技术[M].北京:石油工业出版社,1998:113-115.
[7]张孝华.现代泥浆实验技术[M].东营:石油工业出版社,1998;45-46.
[8]王荐,舒福昌,吴彬、,等.强抑制聚胺钻井液体系室内研究[J].油田化学,2007,24(4):296—300.doi:10.-3969/j.issn.1000-4092.2007.04.002
[9]朱宽亮,陈金霞,卢淑芹.南堡3号构造深层脆性泥页岩井壁稳定机理分析与实践[J].钻采工艺,2016,39(5):1-4.doi:10.3969/J.IS SN.1006-768X.2016.05.01
[10]郭海峰,付顺龙,陈波,等.低自由水钻井液体系在大斜度井段中的优化与应用[J].钻井液与完井液,2017,34(5):50-53.doi:10.3969i/j.issn.1001-5620.-2017.05.009GUO Haifeng,FU Shunlong,CHEN Bo,et al.Optimization and application of drilling fluid with low free water in high angle well section[J].Drilling Fluid&Completion Fluid,2017,34(5):50-53.doi:10.3969/j.issn.1001-5620.-2017.05.009
[11]王维,杨波,李占伟,等.抗高温聚束钻井液在南堡3-15井的应用[J].钻井液与完井液,2014,31(4):15-18.doi:10.3969/j.issn.1001-5620.2014.04.005
[12]王荐,向兴金,舒福昌,等.一种具有化学反渗透功能的钻井液.CN,103351854A[P].2013-10-16.
[13]张海山,罗勇,张荣,等.抗高温平衡水钻井液体系性能研究[J].化学与生物工程,2013,30(10):64-67.doi:10.3969/j.issn.1672-5425.2013.10.017ZHANG Haishan,LUO Yong,ZHANG Rong,et al.Performance study on high temperature-resistant balancewater drilling fluid[J].Chemitry&Bioengineering,2013,30(10):64-67.doi:10.3969/j.issn.1672-5425.2013.10.-017
[14]陈金霞,阚艳娜,陈春来,等.反渗透型低自由水钻井液体系[J].钻井液与完井液,2015,32(1):14-17.doi:10.3969/j.issn.1001-5620.2015.01.004
[15]何恕,鄢捷年,郑涛,等.长垣东部深井井壁失稳及技术对策[J].天然气工业,2006,26(6):86-88.doi:10.-3321/j.issn:1000-0976.2006.06.027HE Shu,YAN Jienian,ZHENG Tao,et al.Research on borehole unstability of deep wells in the east Changyuan area of Daqing Oilfield and related technical measures[J].Natural Gas Industry,2006,26(6):86-88.doi:10.3321/j.-issn:1000-0976.2006.06.027