煤田绳索取心钻进技术的实践与认识

本文结合生产实践,对煤田钻探绳索取心技术的钻孔结构、钻头选择、粉煤取心、护孔堵漏、钻具配套等问题,提出了一些认识。包括孔径确定、钻具级配、孔身构造、技术套管;钻头选型、胎体磨料、水口形态;粉煤钻头、碎岩取心器、自锁半合管;冲洗液选型、随钻堵漏、停钻堵漏工艺;以及应用加长岩心管、钻杆接手、防斜接手、可退式打捞矛等。

PRACTICE AND KNOWLEDGE ON THE WIRE-LINE CORING FOR COAL DRILLING

Based on producing and practising,some knowledge about the question of rope coring technology,well structure,types of bits,coal cuttings coring,well protection,drill equipment matching and so on in coalfield drilling are presented in this paper.Including well diameter determination,drill stem equipment matching,well structure,protective casing; bit sizes selecting,matrix material; powder coal bits,cuttings corer,automatic-locking half-close tube;types of drilling fluids,pluging a hole with drilling or halting technology; and the use of adding the length of core barrel,pipe joint,tiltproof joint and separable fishing lance.