抗高温高密度钻井液在印尼LOFIN-2井的研究和应用
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摘要
LOFIN-2井是部署在印尼东部塞兰岛的一口重点探井,垂深为5861 m,为印尼陆上最深井。该井高温高密度井段预测井温为150～180℃,密度为2.10～2.16 g/cm~3,发育裂缝性页岩、含高压盐水层,易发生诱导性井漏和盐水侵,并且发育粉砂质泥岩,易分散造浆使抗高温高密度钻井液的流变性难以控制。针对LOFIN-2井高温高密度和地层特点,提出了钻井液设计性能参数,并进行现场验证,从抵抗温度对钻井液性能破坏出发,优选抗温处理剂,研制出一套抗温180℃、密度2.10～1.26 g/cm3的水基钻井液体系,该体系在现场应用性能稳定,配制维护简单,应用效果良好,为该区块后续高温高压钻井液体系提供了一种选择。
Well Lofin-2, a deepest onshore well drilled in Indonesia, is a key exploratory well deployed on the Seran Island, east Indonesia, with vertical depth of 5861 m. The highest temperature of the well is between 150 ℃ and 180 ℃, and a mud of 2.10–2.16 g/cm~3 has to be used to balance the formation pressures. Drilling challenges include fractured shales, high pressure saltwater zones,which are the causes of induced mud losses and formation water invasion, and silty mudstones, which are the easy to disperse into drilling fluid to make the mud rheology uncontrollable worse. A drilling fluid was formulated to deal with these problems. Some high temperature drilling fluid additives were selected to render the drilling fluid good stability at elevated temperatures. The water base drilling fluid formulated is able to work normally at temperatures up to 180 ℃ and has densities adjustable between 2.10 g/cm3 and 2.16 g/cm3. Field application of this drilling fluid showed that it had stable properties which were easy to maintain. The well was successfully drilled with no big troubles. The use of this drilling fluid has provided a choice of using HTHP drilling fluid in this block.
Well Lofin-2, a deepest onshore well drilled in Indonesia, is a key exploratory well deployed on the Seran Island, east Indonesia, with vertical depth of 5861 m. The highest temperature of the well is between 150 ℃ and 180 ℃, and a mud of 2.10–2.16 g/cm~3 has to be used to balance the formation pressures. Drilling challenges include fractured shales, high pressure saltwater zones,which are the causes of induced mud losses and formation water invasion, and silty mudstones, which are the easy to disperse into drilling fluid to make the mud rheology uncontrollable worse. A drilling fluid was formulated to deal with these problems. Some high temperature drilling fluid additives were selected to render the drilling fluid good stability at elevated temperatures. The water base drilling fluid formulated is able to work normally at temperatures up to 180 ℃ and has densities adjustable between 2.10 g/cm3 and 2.16 g/cm3. Field application of this drilling fluid showed that it had stable properties which were easy to maintain. The well was successfully drilled with no big troubles. The use of this drilling fluid has provided a choice of using HTHP drilling fluid in this block.
引文
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[2]胡文军,罗平亚,白杨,等.新型高温高密度盐水钻井液研究[J].钻井液与完井液,2017,34(3):1-10.HU Wenjun,LUO Pingya,BAI Yang,et al.Study on a new high temperature high density saltwater drilling fluid[J].Drilling Fluid&Completion Fluid,2017,34(3):1-10.
[3]蒲晓林,黄林基,罗兴树,等.深井高密度水基钻井液流变性、造壁性控制原理[J].天然气工业,2001,21(6):48-51.PU Xiaolin,HUANG Linji,LUO Xingshu,et al.Mechanism of control of rheology and fluid loss for HTHP water-based mud[J].Journal of Gas Industry,2001,21(6):48-51.
[4]刘德胜,徐学兵,李济生,等.严重造浆地层高密度钻井液技术研究与应用[J].钻井液与完井液,2006,23(5):4-7.LIU Desheng,XU Xuebing,LI Jisheng,at al.Research and application of heavy mud technology in strong mudmaking formations[J].Drilling Fluid&Completion Fluid,2006,23(5):4-7.
[5]王平全,杨坤宾,朱涛,等.复配重晶石对水基钻井液性能的影响[J].钻井液与完井液,2014,31(1):16-19.WANG Pingquan,YANG Kunbin,ZHU Tao,et al.Effect of composite barite on properties of water based drilling fluid[J].Drilling Fluid&Completion Fluid,2014,31(1):16-19.
[6]IBRAHIM M N M,CHUAH S B,CHENG P Y.Tin-tannin-lignosulfonate complex:An improved lignosulfonate-based drilling fluid thinner[J].Jurnal Teknologi,2012,38(1):25-32
[7]TEHRANI A,YOUNG S,GERRARD D,et al.Environmentally friendly water based fluid for HT/HPdrilling[C]//SPE International Symposium on Oilfield Chemistry.Society of Petroleum Engineers,2009.