Since the beginning of this year, Sichuan Drilling Branch has followed the pace of the increase in the production of production in western Sichuan. Based on the excellent drilling mode, it has vigorously promoted the use of new technologies and new processes and achieved fruitful results. As of November 7th, there were more than 40 innovative drilling technical indicators in the western Sichuan region with complex geological conditions and strong grinding, and 11 well teams exceeded 10,000 meters.
In order to overcome the bottleneck of drilling speed in deep wells in western Sichuan, the company effectively improved the mechanical drilling of the Xujiahe Formation by using liquid underbalanced drilling technology, high-efficiency PDC bits and new tool technologies such as “turbine + impregnated drill bitsâ€. speed. In the construction of the key exploration well-Pengzhou 1 well in western Sichuan, the 70141 well team opened three φ241.3mm wellbore and 3332-4050m well section, using Smith turbine drilling technology, with a drill bit of 718 meters and a drilling speed of 2.54 meters per hour. The area must be four, the three-layer turbine drilling drilling speed and the single drill bit footage; the 70139XN well team construction Dushen 1 well, the second well section using the impregnated diamond drill bit + turbo drilling technology, construction time 23.4 days, The shortest drilling time for the Turbine drilling in the Shoudi Formation in the western Sichuan area.
In order to achieve the goal of speed-up and improvement of medium-deep directional well drilling, the company reduced the sloping sliding drilling section by using large-degree curved screw and preferred PDC bit slanting technology; using new tools such as drilling wall dresser and hydraulic oscillator. The well wall is kept smooth, the drilling pressure problem is effectively solved, and the construction efficiency of the inclined shaft section is improved. At the same time, in response to the technical problem of large horizontal friction, the company reduced the drilling friction and reduced the underground well by using the new polyamine-based oil-based drilling fluid system, adding hollow microbead lubricant and strengthening the wall sealing. Complex conditions increase drilling efficiency. In the Gaomiao battle area, the Gaosha 301-2 well constructed by the 40,680 well team completed a drilling depth of 3085 meters and a drilling cycle of 33.92 days. The same directional wells in the western Sichuan area have the shortest drilling cycle, the highest drilling rate and the highest monthly efficiency. The record of the Gaosha 302 well constructed by the 40,863 well team, the drilling depth is 3,162 meters, and the drilling cycle is 24.25 days. It has created 7 records of the shortest drilling cycle, the highest mechanical drilling rate and the highest monthly efficiency.
In view of the technical difficulties of the collapse of the Penglaizhen-Shaximiao Formation in the Zhongjiang area, the drilling fluid formulation was continuously optimized to enhance the suppression performance, the drilling fluid density was adjusted in advance, and the wall support force was increased to ensure the safety of the well construction. At the same time, the screw + MWD process technology is preferred, the trajectory control is enhanced, the drilling tool combination is optimized, and rapid drilling is realized. The Jiangsha 33-2 well constructed by the 50103 well team has a drilling depth of 2752 meters and a drilling cycle of 24.38 days. It has 6 records of the shortest drilling cycle, the highest average drilling rate and the shortest completion cycle of the same well in the Zhongjiang area; the 40221XN well team The construction of the Jiangsha 21-7HF well has a drilling depth of 3003 meters and a drilling cycle of 22.83 days. The drilling wells of the same horizontal wells in Chuangchuan West have the shortest drilling cycle, the highest average drilling rate and the highest monthly efficiency.
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