复杂地层双目标深井定向钻井技术

DIRECTIONAL DRILLING TECHNIQUE FOR DOUBLE TARGET DEEP WELLS WITH SOPHISTICATED FORMATION

谯抗逆 龙绪明

Qiao Kangni Long Xuming

四川石油管理局川东钻探公司

茨竹1井为川东高陡构造带上主探长兴生物礁和石炭系的双目标、大水平位移、定向深井,井身剖面为"直-增-稳-降-稳"五段制"S"形井眼。完钻井深5625m、水平位移1235.70m。文中详细介绍了复杂条件下上部地层钻井工艺技术、井身轨迹控制技术及安全钻井工艺技术,克服了地层倾角大、垮塌严重、地层硬、产层埋藏深、水平位移大、长段取心作业、中途加深设计井深、钻遇罕见溶洞性6个漏层等困难,准确命中双靶,井身质量优良。

Well Clzhu-1 is a double target, long lateral displacement and directional deep well of main exploration Changxing reef and Carboniferous system on Chuandong high-steep structural belt with the "five section system" well profile. The final depth is 5625m, the lateral displacement is 1235. 70m. The drilling technology for the top formation, hole trajectory controlling technique and safe drilling technology under rough conditions were introduced in detail. The following difficulties were overcome:high dip angle formation, serious collapse, tough formation, deep burial depth of producing zones, long horizontal displacement, long-section coring operation, deepening design depth half way and having drilled six rare vugular lost circulation zones and so on. The double targets were hit precisely with high quality wellbore.

10.3969/j.issn.1000-7393.1998.01.007