煤层气全井欠平衡钻井技术柳林实践  

Drilling Practice of Full-hole Underbalanced Drilling Technology of CBM in Liulin Block

作　　者：闫立飞[1,2] 申瑞臣 夏焱 孟尚志[3] 

机构地区：[1]中国石油集团钻井工程技术研究院,北京100195 [2]中国石油大学(北京),北京102249 [3]中联煤层气有限责任公司,北京100011

出　　处：《中国煤层气》2014年第6期7-10,共4页China Coalbed Methane

基　　金：国家科技重大专项课题"煤层气欠平衡钻井配套技术研究"(2011ZX05036-003)

摘　　要：室内研究表明,全井欠平衡钻井流体具有低密度、良好流变性、强抑制性以及较强承压能力。CLY-22井全井段采用欠平衡钻进。二开空气钻进初期添加成核剂钻进,起到润滑钻具作用,保证快速钻进。地层出少量水,循环介质自然形成雾。地层出水量增大,环空自动出现泡沫,携岩性变差。随后,边钻边添加成膜剂、成层剂和定位剂,使循环介质自动转化为绒囊钻井液,顺利完钻,下入φ139.7mm套管,钻井周期比设计周期缩短约7天。According to the lab experiments,the drilling fluid was low in density with good rheology,inhibitive ability and bearing capacity.CLY-22 well was drilled by full-hole underbalanced.The fuzzy-ball fluid was used in the second section.Gas-core generated agent was added in the early stage of second section to smooth the drilling tools and improve ROP.When little water invaded the well-bole,air changed to mist naturally.As the influx of water increasing,the foam appeared.However,the carrying cuttings capacity of fluid decreased.Then the foam was transformed naturally to fuzzy-ball by adding membrane generated agent,layer generated agent and fuzzy generated agent without stopping drilling processes.The casing pipe size was φ139.7mm.The drilling cycle was shorted by about 7 days.

关 键 词：煤层气 全井欠平衡 绒囊 

分 类 号：TE249[石油与天然气工程—油气井工程]