Liquid-Liquid Gravity Displacement Test Based on Experimental Apparatus for Real Fractures
-
摘要: 为了解裂缝性地层发生液液置换过程中流体在裂缝中的真实流动形态，通过扫描现场实际露头裂缝，构建了真实的裂缝空间，根据裂缝性地层液液重力置换机理，利用可视化井筒-地层耦合流动试验装置进行了钻井液与模拟地层流体的可视化重力置换试验，分析了裂缝宽度、井口回压、钻井液密度、钻井液黏度和地层流体黏度对定容性地层液液置换量的影响规律，并根据量纲分析理论回归了置换量与各影响因素的关系。结果表明：裂缝宽度、井口回压和钻井液密度增大，置换速率和置换量均增大；钻井液和地层流体黏度升高，置换速率和置换量均减小；循环当量密度相同时，采用低密度钻井液加回压的方式，置换量较小。这表明，裂缝两端的压差是发生液液置换的主要原因，而钻井液与地层流体的密度差与黏度差是导致裂缝两端产生压差的主要因素。Abstract: In order to understand the actual flow pattern of fluids inside fractures during liquid-liquid displacement,visualized displacement tests for drilling fluid and simulated formation fluid were conducted with a visualized apparatus for wellbore-formation coupled flow based on the liquid-liquid gravity displacement mechanism of fractured formations.This apparatus could simulate real fracture space by reference to fractures scanned in field outcrops.The affecting rules of fracture width,wellhead back pressure,density of drilling fluid,viscosity of drilling fluid and viscosity of formation fluid on the liquid-liquid displacement amount in volume-constant formations were analyzed,and further the relationships among the displacement amount and all influential factors were regressed on the basis of the dimension analysis theory.The results indicated that with the increase of fracture width,wellhead back pressure and density of drilling fluid,the displacement rate and amount would be increased;while with the increase of viscosity of drilling fluid and formation fluid,the displacement rate and amount would be reduced;under the same equivalent circulating density,drilling fluids with lower density and back pressure could produce less displacement amount.These results suggest that the pressure difference between the two ends of fractures is the key reason for the displacement,which can be traced to the differences between drilling fluid and formation fluid in density and viscosity.The research results can provide guidance for the control of liquid-liquid gravity displacement in fractured formations.
-
-
[1] 马宗金.总结经验教训提高天然气井钻井井控能力[J].钻采工艺,2004,27(4):1-5. MA Zongjin.Summing up experience to improve well control ability of natural gas well[J].Drilling Production Technology,2004,27(4):1-5. [2] 张志.裂缝性气藏重力置换溢流规律研究[D].成都:西南石油大学,2008. ZHANG Zhi.Research on the rule of gravity displacement in fracture gas reservoir[D].Chengdu:Southwest Petroleum University,2008. [3] 舒刚,孟英峰,李皋,等.重力置换式漏喷同存机理研究[J].石油钻探技术,2011,39(1):6-11. SHU Gang,MENG Yingfeng,LI Gao,et al.Mechanism of mud loss and well kick due to gravity displacement[J].Petroleum Drilling Techniques,2011,39(1):6-11. [4] 贾红军.钻遇裂缝性地层溢漏同存机理研究[D].成都:西南石油大学,2013. JIA Hongjun.Mechanism study on well kick accompanied with lost circulation during drilling fractured formation[D].Chengdu:Southwest Petroleum University,2013. [5] 赵向阳,孟英峰,侯绪田,等.沥青质稠油与钻井液重力置换规律与控制技术[J].石油钻采工艺,2016,38(5):622-627. ZHAO Xiangyang,MENG Yingfeng,HOU Xutian,et al.Pattern and control of gravity displacement between asphaltic heavy oil and drilling fluid[J].Oil Drilling Production Technology,2016,38(5):622-627. [6] 路保平,侯绪田,邢树宾.伊朗雅达油田沥青层置换机制与压力波动分析[J].中国石油大学学报(自然科学版),2017,41(6):88-93. LU Baoping,HOU Xutian,XING Shubin.Asphalt displacement mechanism and pore pressure fluctuation in Yadavaran Oilfield,Iran[J].Journal of China University of Petroleum(Edition of Natural Sciences),2017,41(6):88-93. [7] CHANG L,GAO Y.A simple numerical method for contact analysis of rough surfaces[J].Journal of Tribology-Transactions of the ASME,1999,121(3):425-432.
[8] LOMIZE G M.Flow in fracturedrock(in Russian)[M].Moscow:Gosemergoizdat,1951:127-129.
[9] LOUIS C,MAINI Y N.Determination of in-situ hydraulic parameters in jointedrock[J].International Society of Rock Mechanics Proceedings,1970,1:1-19.
[10] DYKE C G,WU B,MILTON-TAYLER D.Advances incharacterising natural fracture permeability from mud log data[J].SPE Formation Evaluation,1995,10(3):160-166.
[11] MAJIDI R,MISKA S Z,YU M,et al.Quantitative analysis of mud losses in naturally fractured reservoirs:the effect ofrheology[J].SPE Drilling Completion,2010,25(4):509-517.
-
期刊类型引用(6)
1. 严德，陈彬，田瑞瑞，宋玲安，王彪，刘保波. 深水携表层钻井工艺技术. 钻采工艺. 2021(06): 36-39 . 
百度学术
2. 鲍新坤，任益辉. 深水喷射钻进钻井参数设计研究与制定. 石化技术. 2018(05): 252-253 . 百度学术
3. 刘和兴，方满宗，刘智勤，徐一龙，孟文波. 南海西部陵水区块超深水井喷射下导管技术. 石油钻探技术. 2017(01): 10-16 . 本站查看
4. 张洪坤，孙宝江，徐爽，黄名召，王凌霄，潘少伟，丛龙峰. 深水喷射下导管射流破土数值模拟及试验验证. 石油机械. 2016(04): 33-37+41 . 百度学术
5. 周波，杨进，周建良，刘正礼，杨建刚. 深水钻井喷射下导管排量设计方法. 石油钻探技术. 2016(03): 21-26 . 本站查看
6. 李家仪，许亮斌，周建良，畅元江. 基于非概率可靠性的喷射导管下入深度设计方法. 石油钻探技术. 2015(04): 8-12 . 本站查看
其他类型引用(5)
计量
- 文章访问数: 4396
- HTML全文浏览量: 86
- PDF下载量: 3694
- 被引次数: 11
下载:
