论文部分内容阅读
沙特阿美石油公司的首个中半径水平侧钻井,Haradh-AX1井,于2008年6月完钻,它创造了一个耗时48.7天、油层接触深度4989ft、共减少总成本33%的记录。先前,二叠系Khuff-C段水平侧钻井与Haradh-AX1井的操作相同,即:钻开完井段,侧钻,重新完井。沿Khuff-C段侧钻分支,平均每83天可钻3441ft。中径分支定向井在以12°/100ft增斜,以88°倾斜角稳斜后钻进,可以获得较快的钻头钻进速率、较低的扭矩和摩阻,以及较高的井眼稳定性和可控性。在先前的长水平段侧钻设计中,需要进行充分的磨铣以进入83/8in的侧钻裸眼井段。然后从底层的白云岩开钻83/8in的长径造斜段,穿过底部压力异常的Sudair页岩储层到Khuff-C段的顶部,下7in的筛管并进行水泥固井。继续穿过Khuff-C段侧钻57/8in的分支,使用裸眼完井。在中径设计中,在相同的压力区,通过在Khuff-C目的层以上真垂深450ft处的7in筛管凿孔,造斜,钻57/8in的井眼穿过Khuff-C直到井总深,这样可以把侧钻段设计得更深。本文将从中径钻井技术出发,以沙特阿美石油公司的Arab-D油气藏水平油井(真垂深6500ft)和水平气井(真垂深12000ft的Khuff储层)为例详述中径钻井技术在减少钻时和节约成本方面的应用。
Saudi Aramco’s first mid-radius horizontal well, the Haradh-AX1 well, drilled in June 2008, created a record 48.7-day dip with an oil depth of 4989 ft, a total reduction of 33%. Previously, horizontal well drilling in the Permian Khuff-C section had the same operation as the Haradh-AX1 well, namely drilling and completion section, sidetracking and re-completion. Drill along the Khuff-C section and branch for an average of 3441 ft per 83 days. Mid-diameter branch directional wells are drilled with a ramp of 12 ° / 100ft and a steep slope of 88 °, resulting in faster bit drilling rates, lower torque and friction, and higher borehole stability Sexuality and controllability. In previous long horizontal section sidetrack designs, full milling was required to enter the 83 / 8in sidetrack openhole section. The 83/8-in. Long diameter ramp was then drilled from the underlying dolomite through the Sudair shale reservoir at the bottom of the pressure anomaly to the top of the Khuff-C section, down to a 7-in. Screen and cemented. Continue drilling through the 57 / 8in branch of the Khuff-C section and complete with openhole. In the bore design, a borehole was drilled through a 7in screen at a true true depth of 450ft above the Khuff-C target formation at the same pressure zone and a 57/8 in. Borehole was drilled through Khuff-C until well total Deep, so you can design the sidetrack deeper. This article will proceed from the medium-diameter drilling technology, with Saudi Arabian oil company Arab-D reservoir horizontal wells (true vertical depth 6500ft) and horizontal gas wells (true vertical depth of 12000ft Khuff reservoir) as an example to describe the middle-diameter drilling technology in reducing Drilling and cost-saving applications.