completion of drilling the first directional well in Yaerxia Block of Petro China Yumen Oilfield

On September 23, the Company smoothly completed the drilling of Ya 6-12 well in Yaerxia Block of Yumen Oilfield. As a directional well under general contracting requiring fast construction, the well is designed to be 3,500m deep with the second section of 8,00m to 2,700m. The construction period is designed to be 15 days. Fast and vertical drilling is required. According to the requirements of Party A, the construction personnel of the Company on the site overcame various difficulties, like complex stratum structure, big dip angle and poor drillability of stratum on the premise of optimizing drill assembly, rationally choosing screw drills, configuring rational drilling parameters in combination with the actual situation underground, and elaborately using underground measurement while drilling (MWD) instruments.

With a maximum deflection of 1.1° and maximum dogleg angle of 0.98°/30m, this well presents good indicators. We used 7LZ172*7.0 screw drill made by the Company throughout the process. Thanks to the characteristics of high torque at slow speed, strong overload resistance as well as fast and stable drilling, the drilling tool is highly recognized by customers and is extensively promoted and used in this area. The personnel of the Company for drilling orientation met challenges, made painstaking and surmounted weak network and communication signals in spite of large temperature difference between days and nights and severe desert environment. On the premise of zero failure of screw instruments, the construction tasks of this phase were completed smoothly in 12 days, saving three days.

The whole trajectory control process is steadily advanced as per customer’s operation requirements. The construction tasks are completed efficiently, shortening the drilling period.build a model image for improving the well drilling speed in this block, with an unanimous praise from Party A and the construction drilling crew. The company fulfilled the zero breakthroughs in Yumen Oilfield, accumulated valuable experience for the further development of directional drilling services to lay a good foundation for the expansion of western engineering service market.The successful completion of the well drilling marks that the company has the capacity of providing the high quality, safe, fast and efficient directional construction services for all construction drilling crew.