塔中四油田水平井钻井完井技术

塔里木盆地沙漠腹地的塔中四油田有3个高声、,其中402高点的CⅡ油组是一个块状底水油藏,均质段油层厚度大、物性好、夹层不发育、底水活跃、储量大,用水平井开发能防止底水锥进。从1994年4月至1996年2月,在近2年时间内完成了5口水平井,平均适斜,点井深3323.32m,平均村深4230.62m,平均垂深3593.50m,平均水平段长492.01m,平均水平位移785.62m,平均钻井周期195.46d,初卢原油都在1000t/d以上,稳产原油都在600t/d以上,生产50d就可收回全部钻井投资。文中介绍了优化并身结构和优化井眼剖面设计,着重加绍了直井段防科打直技术,造科段以动力钻具为主和以转盘钻为主的开眼轨迹控制技术,水平段以转盘钻配DTU导向钻具和PDC钻头为主的开眼轨迹控制技术,利用计算机预测井眼轨迹控制技术,钻井液和完井技术以及通过施工得到的几声、认识。

DRILLING AND COMPLETION TECHNIQUES OF HORIZONTAL WELLS IN TZ-4 RESERVOIR

?Five horizontal wells in TZ- 4 reservoir were drilled and completed during the period of April 1994 to February 1996. These horizontal wel1s are characterized by their average inclination start point of 3, 323. 32 m, average true depth of 4, 23O. 62 m, average vertical depth of 3, 593. 50 m, average horizontal segment of 492. 01 m, average horizontal displacement of 785. 63 m, average drilling period of 195. 46 d, initial production over 1,000 t/d, sturdy production over 6,000 t/d and investment recovery period of 50d. An optimiza tion design of hole profile and well trajectory was described in this paper. A series of tech niques such as technique of deviation prevention and verticality keeping of the vertical bore hole segment, technique of control wellbore trajectory in the inclined portion with power tool or rotary table, technique of control of trajectory in the horizontal section with rotary table combined with DTL guide tool and PDC bit, technique of wellbore trajectory prediction with computer, technique of drilling fluid and technique of well completion were recommended with emphasis in the paper.