陆域天然气水合物厚覆盖层跟管取心技术研究
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摘要
针对陆域天然气水合物厚覆盖层取心钻进中存在的采取率低、孔壁不稳定等技术难题,制定了"隔水式单动双管取心、低温钻井液护心护壁、孔底扩眼跟管钻进"的钻进方法。隔水式单动双管取心是湿式钻进,相比于干钻取心,钻井液能起到良好的护壁作用;采用近钻头冷却,钻井液不会直接冲刷、冲散岩心,松散沉积地层能够进入岩心管;单动双管钻具,内管不回转,有效保护岩心的原位性。低温钻井液能够抑制水合物分解,有利于钻获水合物实物样品,通过室内试验确定了低温钻井液配方,研制了新型的翅片管式钻井液冷却装置,具有启动电流小、换热效率高等突出优点。跟管护壁是单动双管取心、液推式扩眼器扩孔的同时将套管下入孔内,起到护壁作用,根本上解决成孔问题。
The drilling method adopting water insulate onetube-rotating double tube core drilling tool,low temperature mud to protect the core and wellbore,bottom hole reaming with casing behind is developed to overcome the problems of low core recovery rate and instable wellbore during core drilling through natural gas hydrate covered formations onshore. The water insulate one-tube-rotating double tube core drilling is wet drilling.The circling mud can enhance the wellbore compared with the dry core drilling. Near bit cooling adopted will not directly scour and disperse the core,allowing the loose core entering the core tube. Only the outer tube of the double tube drilling tool rotates,the inner tube without turning can effectively keep the core in place. Low temperature mud can also restrain the resolution of the hydrate which is advantageous to obtain the hydrate sample.Through laboratory tests the low temperature mud formula has been determined,a new type mud cooling finned tube device is developed,which has the advantages of small starting current and high heat exchange efficiency. Together with double tube coring,the hydraulic reamer is enlarging downhole and casing is run in to protect the wellbore,and the hole is successfully constructed.
The drilling method adopting water insulate onetube-rotating double tube core drilling tool,low temperature mud to protect the core and wellbore,bottom hole reaming with casing behind is developed to overcome the problems of low core recovery rate and instable wellbore during core drilling through natural gas hydrate covered formations onshore. The water insulate one-tube-rotating double tube core drilling is wet drilling.The circling mud can enhance the wellbore compared with the dry core drilling. Near bit cooling adopted will not directly scour and disperse the core,allowing the loose core entering the core tube. Only the outer tube of the double tube drilling tool rotates,the inner tube without turning can effectively keep the core in place. Low temperature mud can also restrain the resolution of the hydrate which is advantageous to obtain the hydrate sample.Through laboratory tests the low temperature mud formula has been determined,a new type mud cooling finned tube device is developed,which has the advantages of small starting current and high heat exchange efficiency. Together with double tube coring,the hydraulic reamer is enlarging downhole and casing is run in to protect the wellbore,and the hole is successfully constructed.
引文
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[5]张川,王胜,陈礼仪,等.用于冻土区天然气水合物钻探的聚合物钻井液低温流变响应[J].天然气工业,2016,36(2):92-97.
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[8]李宽,张永勤,孙友宏,等.天然气水合物钻井泥浆冷却系统研究及优化[J].钻采工艺,2013,36(4):34-36.
[9]马岩,邢希金.天然气水合物钻井液冷却技术进展[J].非常规油气,2016,3(1):82-86.
[10]李宽,张永勤,王汉宝,等.冻土区天然气水合物钻井泥浆冷却系统设计及关键参数计算[J].探矿工程,2014,41(7):45-48.
[2]张永勤,孙建华,贾志耀,等.中国陆地永久冻土带天然气水合物钻探技术研究与应用[J].探矿工程,2009(增刊):22-28.
[3]罗整,温杰,李金和,等.跟管钻进技术运用于气体钻井的可行性分析[J].石化技术,2015(5):118-119.
[4]刘建福,王建兴,孙秀梅,等.松散性厚覆盖层钻进实践与体会[J].地质装备,2015,16(1):36-38.
[5]张川,王胜,陈礼仪,等.用于冻土区天然气水合物钻探的聚合物钻井液低温流变响应[J].天然气工业,2016,36(2):92-97.
[6]唐翠萍,李清平,杜建伟,等.组合天然气水合物抑制剂性能及经济性研究[J].西南石油大学学报(自然科学版),2009,31(2):109-112.
[7]刘玉民,赵大军,郭威,等.水合物钻探低温钻井液制冷系统实验及理论[J].吉林大学学报(地球科学版),2012,42(增):301-308.
[8]李宽,张永勤,孙友宏,等.天然气水合物钻井泥浆冷却系统研究及优化[J].钻采工艺,2013,36(4):34-36.
[9]马岩,邢希金.天然气水合物钻井液冷却技术进展[J].非常规油气,2016,3(1):82-86.
[10]李宽,张永勤,王汉宝,等.冻土区天然气水合物钻井泥浆冷却系统设计及关键参数计算[J].探矿工程,2014,41(7):45-48.
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