摘要
通南巴地区地层可钻性差,地层复杂,井漏、井塌严重,常规钻井液机械钻速在0.8m/s以下,个别井漏失钻井液近2×104m3。近年来气体钻井技术迅速发展,先后在通南巴地区进行了10余口井的气体钻井、泡沫钻井,上部地层机械钻速大幅度提高。但气体钻井遇到了地层应力垮塌、地层出水量大等工程地质难题,导致了下沙溪庙组-须家河组近2000m的井段无法使用气体钻井提速。文章提出通过充气钻井方式应对上述难题,并详细介绍了充气钻井的工艺特点及现场实验应用,将进一步提高河坝地区复杂地层的钻井效率。
The reservoir features of Tongnanba block are low drillabillity,complex formation and serious collapse,downhole complex problems often occurred in conventional overbalanced drilling,the average ROP is under 0.8m/s,the total lost circulation volume almost reaches 2 104m3 in some wells.With the development of gas drilling technology,more than 10 wells were drilled in Tongnanba Block by using gas drilling and foam drilling,the ROP in upper formation was increased obviously,but the methods can not be applied from Shaximiao group to Xijiahe group(thickness 2000m) due to collapse and formation water.The aerated liquid drilling technique can solve above problems.This paper introduced the technical characteristics and field application of aerated liquid drilling in Tonnanba block.
出处
《钻采工艺》
CAS
北大核心
2009年第4期8-10,116,共3页
Drilling & Production Technology
关键词
空气钻井
应力
垮塌
出水
负压钻井
gas drilling,stress,collapse,water output,underbalanced drilling
