塔中地区碳酸盐岩储层控压钻水平井技术

塔里木盆地塔中地区碳酸盐岩储层含有丰富的油气资源，为尽快实现油气勘探开发的新突破，国家组织了科技重大专项示范工程进行攻关。由于该区碳酸盐岩储层地质情况复杂，钻井工程实践中存在许多亟待解决的技术难点，主要有：压力敏感，溢流、井漏频繁发生；硫化氢含量不均匀，有高有低；钻遇裂缝，提高单井产能等。在分析塔中碳酸盐岩储层钻井技术难点及解决办法的基础上，提出利用水平井特殊轨迹增产的技术方案，并倡导能消除储层伤害、保障工程安全的“控压钻水平井”新技术。控压钻水平井技术在该区某井的实钻应用中取得了成功，完成水平段长度为875 m，创造了塔中地区的钻井新纪录。

Managed pressure drilling applied to horizontal wells targeting carbonate gas reservoirs in middle Tarim Basin

Rich hydrocarbon resources were found in carbonate reservoirs in the middle Tarim Basin. To get quick break-throughs in oil and gas exploration and development there, specific national scientific research and projects have been carried out. At this area, because of the complicated geologic conditions of carbonate reservoirs, many technical difficulties in drilling engineering need to be overcome, such as pressure sensitivity, frequent kicks and lost circulations, uneven distribution of H_2S, fractures encountered during drilling, and the productivity per well to be improved. The solutions for these difficulties are dis-cussed herein, and horizontal wells with special profiles are recommended to improve the production, and managed pressure drilling is recommended to reduce reservoir damage and ensure engineering safety. The combination of horizontal well and man-aged pressure drilling has been successfully applied to the well TZxx-xxH, with the completed horizontal section being 875 m long, which sets up a new record for drilling in the middle Tarim Basin.