An enlarged pipe at the top of a casing string that serves as a funnel to guide drilling tools into the top of a well.
套管柱顶部的一根大口径管，形如漏斗，以引导钻井工具进入到井眼的顶部。
This paper introduces a new wall protection method for drilling loose strata casing pipe wall protection.
本文介绍一种新的钻探松散地层护壁方法——套管护壁“三板斧”。
This is a reversal thinking operation concept against the pipe drilling method of casing pipe wall protection described in conventional books.
本方法与书本上所述的套管护壁跟管钻进方法有反向思维操作概念。
Thee main products are: all kinds of diamond drill bits, PDC bits, casing boots, reaming, single and double tube wireline coring drilling, coring drill pipe, casing and other drilling tools.
主要产品有：各类金刚石钻头、复合片钻头、套管靴子、扩孔器、单双管绳索取芯钻具、绳索取芯钻杆、套管及其它钻探工具。
In the process of sour gas reservoir development, hydrogen sulfide usually causes corrosions and damages in oil line, casing pipe and drilling apparatus.
含硫气田在开发过程中，由于硫化氢的出现，常常会出现油管、套管、钻井设备、钻井仪器等等腐蚀和损坏问题。
In the process of sour gas reservoir development, hydrogen sulfide usually causes corrosions and damages in oil line, casing pipe and drilling apparatus.
含硫气田在开发过程中，由于硫化氢的出现，常常会出现油管、套管、钻井设备、钻井仪器等等腐蚀和损坏问题。
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