摘要
In this paper, the authors have analyzed the problems in the previous well construction, and used the third-interval of well completion technology. In the first interval, after the 273 mm surface casing pipe was tripped in the steady aquifuge above the high pressure hot reservoir, cement sealing was implemented which was ensured by pressure test. In the second interval, the drilling was balanced by increasing the slurry proportion. At the end of drilling, the 219 mm casing was tripped timely based on the limited inrush of water. In the third interval, with the precondition of safety drilling, the well was completed by fresh water-drilling on the basis of debris size to increase the yield. Finally, the well completion was realized favorably with the safe well closure.