控压钻井钻碳酸盐岩储层水平井水力延伸极限的研究
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摘要
水平井是碳酸盐岩储层的有效方式,但是过低的漏失压力是限制碳酸盐储层水平段延伸极限的最主要因素。根据控压钻井工艺方法,文章建立了碳酸岩储层控压水平井水平段水力延伸极限的计算模型,确定了控压钻井方式下最优的钻井液密度,且根据流体力学理论,分别对环空非水平段循环压耗和水平段环空压耗进行计算,进而求出了水平井水平段的水力延伸极限。最后通过实例验证,与常规钻井相比得出控压钻水平井可有效延长水平段的延伸极限,并分析了排量、安全密度窗口度、岩屑床高度和井口回压对水平井水平段水力延伸极限的影响,为在裂缝性储层中开展控压钻水平井作业提供技术支持。
Horizontal well is an effective development way for carbonate reservoir,but low leakage pressure of carbonate reservoir restrict the extension limitation of horizontal well. According to technological process of managed pressure drilling,the calculation model of hydraulic extension limitation of horizontal well was developed,the drilling fluid density of managed pressure drilling was optimized. Based on the hydromechanics theory,annular loss of horizontal section and non- horizontal section was calculated,and then the hydraulic extension limitation of the horizontal well of managed pressure drilling was obtained. At last,field application results showed that managed pressure drilling could effectively increase the extension limitation of horizontal section compared to conventional drilling. And the influences of pump displacement,the density window for safe drilling fluid,the height of cuttings bed and back pressure on the hydraulic extension limitation of horizontal well were analyzed,which provided technical support for managed pressure drilling operation of fractured reservoir.
Horizontal well is an effective development way for carbonate reservoir,but low leakage pressure of carbonate reservoir restrict the extension limitation of horizontal well. According to technological process of managed pressure drilling,the calculation model of hydraulic extension limitation of horizontal well was developed,the drilling fluid density of managed pressure drilling was optimized. Based on the hydromechanics theory,annular loss of horizontal section and non- horizontal section was calculated,and then the hydraulic extension limitation of the horizontal well of managed pressure drilling was obtained. At last,field application results showed that managed pressure drilling could effectively increase the extension limitation of horizontal section compared to conventional drilling. And the influences of pump displacement,the density window for safe drilling fluid,the height of cuttings bed and back pressure on the hydraulic extension limitation of horizontal well were analyzed,which provided technical support for managed pressure drilling operation of fractured reservoir.
引文
[1]石希天,肖铁,雷万能,等.塔里木奥陶系碳酸盐岩敏感性储层控压钻井技术应用[J].钻采工艺,2010,33(6):130-131,140.
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[5]郭元恒,何世明,刘忠飞,等.长水平段水平井钻井技术难点分析及对策[J].石油钻采工艺,2013,35(1):14-18.
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[7]余金海,孙宁,崔龙连.控压钻井环空水力模拟计算[J].石油钻采工艺,2011,33(4):1-5.
[8]杨虎.欠平衡钻井中钻井液密度的确定与控制方法[J].石油钻采工艺,2003,25(6):6-7.
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[10]都捷年.钻井液工艺学[M].北京:石油大学出版社,2001.
[11]赵文庄.塔中压力敏感性储层控压钻井技术研究[D].西南石油大学,2010:24-26.
[2]孙超,李根生,康延军,等.控压钻井技术在塔中区块的应用及效果分析[J].石油机械,2010,38(5):27-29.
[3]汪志明,郭晓乐.大位移井水力延伸极限研究[J].钻采工艺,2008,31(4):1-3.
[4]韩来聚,牛洪波,窦玉玲.胜利低渗油田长水平段水平井钻井关键技术[J].石油钻探技术,2012,40(3):7-12.
[5]郭元恒,何世明,刘忠飞,等.长水平段水平井钻井技术难点分析及对策[J].石油钻采工艺,2013,35(1):14-18.
[6]徐坤吉,熊继有,陈军.深井水平井水平段水力延伸能力评价与分析[J].西南石油大学学报(自然科学版),2012,34(6):101-105.
[7]余金海,孙宁,崔龙连.控压钻井环空水力模拟计算[J].石油钻采工艺,2011,33(4):1-5.
[8]杨虎.欠平衡钻井中钻井液密度的确定与控制方法[J].石油钻采工艺,2003,25(6):6-7.
[9]段玉庭,孟英峰,罗平亚.负压钻井最小钻井液密度的确定[J].天然气工业,1989,18(5):14-19.
[10]都捷年.钻井液工艺学[M].北京:石油大学出版社,2001.
[11]赵文庄.塔中压力敏感性储层控压钻井技术研究[D].西南石油大学,2010:24-26.