南海莺–琼盆地复杂地层套管–井眼间隙优化
|
摘要
南海莺–琼盆地地质构造复杂,存在高温高压地层,钻井液安全密度窗口窄,为预防下套管作业过程中产生的波动压力可能诱发的井漏、溢流甚至井喷等井下故障,在充分调研南海莺–琼盆地常用井身结构的基础上,建立了下套管过程中井筒内波动压力计算模型,分析了套管–井眼间隙等不同因素对下套管和注水泥过程中环空压力的影响,对套管–井眼间隙进行了优化。该方法在LD10–2–x井进行了应用,该井五开井段的套管–井眼间隙进优化结果为15.00～19.55 mm,其实际的套管–井眼间隙为17.45 mm,在设计的合理间隙范围内,该井套管下入安全,注水泥过程中未发生井漏、溢流等井下故障。这说明可以根据下套管过程中井筒内波动压力和下套管及注水泥过程中的环空压力优化套管–井眼间隙,为南海莺–琼盆地井身结构设计提供依据。
The goal of this study was to eliminate well hazards and drilling problems associated with wide pressure fluctuations encountered in complex strata in the Ying-Qiong Basin of the South China Sea. This basin is characterized by its high temperature and high pressure strata, complex geological structure and narrow drilling mud window. In order to prevent complex downhole events such as circulation lost, overflow and even blowout induced from pressure fluctuations during casing RIH, a calculation model of pressure fluctuation during casing RIH was established on the basis of a full investigation over the common casing program in the Ying-Qiong Basin of the South China Sea, and the optimization over the casing-wellbore gap was conducted by combining annulus pressure analysis during casing RIH and cementing job under different factors. The casing-wellbore gap of the fifth spud section of Well LD10-2-x subject to narrow safe mud window was optimized, and reasonable gap in that section was defined to be 15.00-19.55 mm. The actual casing-wellbore gap in Well LD10-2-x was 17.45 mm within the reasonable gap range, and the casing was run in the borehole with no downhole events such as circulation lost and overflow during the cementing. This indicated that the casing-wellbore gap could be optimized according to surge pressure during casing RIH, as well as annulus pressure during casing RIH and cementing, which would provide a reference in the casing program design in the Ying-Qiong Basin of the South China Sea.
The goal of this study was to eliminate well hazards and drilling problems associated with wide pressure fluctuations encountered in complex strata in the Ying-Qiong Basin of the South China Sea. This basin is characterized by its high temperature and high pressure strata, complex geological structure and narrow drilling mud window. In order to prevent complex downhole events such as circulation lost, overflow and even blowout induced from pressure fluctuations during casing RIH, a calculation model of pressure fluctuation during casing RIH was established on the basis of a full investigation over the common casing program in the Ying-Qiong Basin of the South China Sea, and the optimization over the casing-wellbore gap was conducted by combining annulus pressure analysis during casing RIH and cementing job under different factors. The casing-wellbore gap of the fifth spud section of Well LD10-2-x subject to narrow safe mud window was optimized, and reasonable gap in that section was defined to be 15.00-19.55 mm. The actual casing-wellbore gap in Well LD10-2-x was 17.45 mm within the reasonable gap range, and the casing was run in the borehole with no downhole events such as circulation lost and overflow during the cementing. This indicated that the casing-wellbore gap could be optimized according to surge pressure during casing RIH, as well as annulus pressure during casing RIH and cementing, which would provide a reference in the casing program design in the Ying-Qiong Basin of the South China Sea.
引文
[1]周开吉,钟兵,袁其骥,等.拟瞬态井内波动压力预测模型[J].西南石油学院学报,1995,17(4):58-64.ZHOU Kaiji,ZHONG Bing,YUAN Qiji,et al.A prediction model for quasi-momentary state well fluctuation pressure[J].Journal of Southwestern Petroleum Institution,1995,17(4):58-64.
[2]钟兵,周开吉,谢清华.偏心环空中稳态波动压力的理论研究[J].西南石油学院学报,1995,17(1):38-45.ZHONG Bing,ZHOU Kaiji,XIE Qinghua.Theoretical study of steady-state surge and swab pressure in eccentric annulus[J].Journal of Southwestern Petroleum Institution,1995,17(1):38-45.
[3]樊洪海,褚元林,刘希圣.起下钻时井眼内动态波动压力的预测[J].石油大学学报(自然科学版),1995,19(5):36-41.FAN Honghai,CHU Yuanlin,LIU Xisheng.Prediction for wellbore dynamic surge pressure while tripping a drillpipe[J].Journal of the University of Petroleum,China(Edition of Natural Science),1995,19(5):36-41.
[4]樊洪海.起下钻动态波动压力应用软件开发[J].石油钻探技术,1995,23(4):11-14,60.FAN Honghai.Development of application software for dynamic surge pressure while tripping[J].Petroleum Drilling Techniques,1995,23(4):11-14,60.
[5]汪海阁,刘希圣.定向井倾斜井段环空中幂律流体的稳态波动压力[J].石油大学学报(自然科学版),1996,20(1):29-33.WANG Haige,LIU Xisheng.Solution of surge pressure of powerlaw fluid in the deviated sections of directional well[J].Journal of the University of Petroleum(Edition of Natural Science),1996,20(1):29-33.
[6]樊洪海,刘希圣.赫谢尔-巴尔克莱液体直井稳态波动压力计算模式[J].石油钻探技术,1994,22(1):51-54,70.FAN Honghai,LIU Xisheng.The steady surge pressure calculation model of Herschel Bulkely fluid in straight wells[J].Petroleum Drilling Techniques,1994,22(1):51-54,70.
[7]王超,李军,柳贡慧,等.钻井开停泵井底波动压力变化特征研究[J].石油钻探技术,2018,46(4):47-53.WANG Chao,LI Jun,LIU Gonghui,et al.Study on the fluctuation of bottomhole pressure while starting and stopping the drilling pump[J].Petroleum Drilling Techniques,2018,46(4):47-53.
[8]彭齐,樊洪海,刘劲歌,等.起下钻过程中井筒稳态波动压力计算方法[J].石油钻探技术,2016,44(4):35-40.PENG Qi,FAN Honghai,LIU Jinge,et al.Improved calculation of wellbore steady fluctuation pressure in tripping operations[J].Petroleum Drilling Techniques,2016,44(4):35-40.
[9]谢国民,何开平,喻先进,等.小井眼波动压力影响因素分析[J].天然气工业,2001,21(3):39-41.XIE Guomin,HE Kaiping,YU Xianjin,et al.An analysis of the factors influencing surge pressure in a slim hile[J].Natural Gas Industry,2001,21(3):39-41.
[10]吴雪平,金业权.修正的稳态波动压力计算法在狭窄环空下套管中的应用[J].重庆科技学院学报(自然科学版),2005,7(2):25-27.WU Xueping,JIN Yequan.The application of modified steady-state wave pressure calculation in narrow annlar case structure[J].Journal of Chongqing University of Science and Technology(Natural Science Edition),2005,7(2):25-27.
[11]江梦娜.井身结构设计中钻井液附加密度的选取准则分析[D].青岛:中国石油大学(华东),2013:20.JIANG Mengna.Analysis of the additional mud density critieria during the casing program design[D].Qingdao:China University of Petroleum(Huadong),2013:20.
[12]福克斯.管网中不稳定流动的水力分析[M].陈祖泽,译.北京:石油工业出版社,1983:83.FOCUS J A.Hydraulic analysis of unsteady flow in pipe network[M].CHEN Zuze,translated.Beijing:Petroleum Industry Press,1983:83.
[13]王凯.水平井井筒压力计算研究[D].青岛:中国石油大学(华东),2009:59-67.WANG Kai.Research on calculation of wellbore pressure in horizontal well[D].Qingdao:China University of Petroleum(Huadong),2009:59-67.
[14]ZUBER N,FINDLAY J A.Average volumetric concentration in two-phase flow system[J].Journal of Heat Transfer,1965,87(4):453-468.
[2]钟兵,周开吉,谢清华.偏心环空中稳态波动压力的理论研究[J].西南石油学院学报,1995,17(1):38-45.ZHONG Bing,ZHOU Kaiji,XIE Qinghua.Theoretical study of steady-state surge and swab pressure in eccentric annulus[J].Journal of Southwestern Petroleum Institution,1995,17(1):38-45.
[3]樊洪海,褚元林,刘希圣.起下钻时井眼内动态波动压力的预测[J].石油大学学报(自然科学版),1995,19(5):36-41.FAN Honghai,CHU Yuanlin,LIU Xisheng.Prediction for wellbore dynamic surge pressure while tripping a drillpipe[J].Journal of the University of Petroleum,China(Edition of Natural Science),1995,19(5):36-41.
[4]樊洪海.起下钻动态波动压力应用软件开发[J].石油钻探技术,1995,23(4):11-14,60.FAN Honghai.Development of application software for dynamic surge pressure while tripping[J].Petroleum Drilling Techniques,1995,23(4):11-14,60.
[5]汪海阁,刘希圣.定向井倾斜井段环空中幂律流体的稳态波动压力[J].石油大学学报(自然科学版),1996,20(1):29-33.WANG Haige,LIU Xisheng.Solution of surge pressure of powerlaw fluid in the deviated sections of directional well[J].Journal of the University of Petroleum(Edition of Natural Science),1996,20(1):29-33.
[6]樊洪海,刘希圣.赫谢尔-巴尔克莱液体直井稳态波动压力计算模式[J].石油钻探技术,1994,22(1):51-54,70.FAN Honghai,LIU Xisheng.The steady surge pressure calculation model of Herschel Bulkely fluid in straight wells[J].Petroleum Drilling Techniques,1994,22(1):51-54,70.
[7]王超,李军,柳贡慧,等.钻井开停泵井底波动压力变化特征研究[J].石油钻探技术,2018,46(4):47-53.WANG Chao,LI Jun,LIU Gonghui,et al.Study on the fluctuation of bottomhole pressure while starting and stopping the drilling pump[J].Petroleum Drilling Techniques,2018,46(4):47-53.
[8]彭齐,樊洪海,刘劲歌,等.起下钻过程中井筒稳态波动压力计算方法[J].石油钻探技术,2016,44(4):35-40.PENG Qi,FAN Honghai,LIU Jinge,et al.Improved calculation of wellbore steady fluctuation pressure in tripping operations[J].Petroleum Drilling Techniques,2016,44(4):35-40.
[9]谢国民,何开平,喻先进,等.小井眼波动压力影响因素分析[J].天然气工业,2001,21(3):39-41.XIE Guomin,HE Kaiping,YU Xianjin,et al.An analysis of the factors influencing surge pressure in a slim hile[J].Natural Gas Industry,2001,21(3):39-41.
[10]吴雪平,金业权.修正的稳态波动压力计算法在狭窄环空下套管中的应用[J].重庆科技学院学报(自然科学版),2005,7(2):25-27.WU Xueping,JIN Yequan.The application of modified steady-state wave pressure calculation in narrow annlar case structure[J].Journal of Chongqing University of Science and Technology(Natural Science Edition),2005,7(2):25-27.
[11]江梦娜.井身结构设计中钻井液附加密度的选取准则分析[D].青岛:中国石油大学(华东),2013:20.JIANG Mengna.Analysis of the additional mud density critieria during the casing program design[D].Qingdao:China University of Petroleum(Huadong),2013:20.
[12]福克斯.管网中不稳定流动的水力分析[M].陈祖泽,译.北京:石油工业出版社,1983:83.FOCUS J A.Hydraulic analysis of unsteady flow in pipe network[M].CHEN Zuze,translated.Beijing:Petroleum Industry Press,1983:83.
[13]王凯.水平井井筒压力计算研究[D].青岛:中国石油大学(华东),2009:59-67.WANG Kai.Research on calculation of wellbore pressure in horizontal well[D].Qingdao:China University of Petroleum(Huadong),2009:59-67.
[14]ZUBER N,FINDLAY J A.Average volumetric concentration in two-phase flow system[J].Journal of Heat Transfer,1965,87(4):453-468.