China's most deep horizontal wells in the Tarim Oilfield drilling:
2014.8 month 2 days of before dawn, by the oil company CNPC Chuanqing drilling in Western Sichuan team 70601 bearing drill tower super deep horizontal well ZG13-3H, after 7 months of construction, safety is drilled to 7849 metres smoothly finished drilling, a China's most deep horizontal well drilled a new record.
ZG13-3H well of Tarim Oilfield is deployed in the north slope of No. 40 tectonic belt of a development of ultra deep horizontal wells. According to the characteristics of risk control and large cross operation high tower block drilling process, Igawa 70601 team strengthening process safety analysis, technical procedures and safety plan in advance for ultra deep horizontal wells.
The tower of Carboniferous, Silurian and other non objective layer, poor drillability, conventional mechanical drilling speed slow, and deep buried targets, high temperature, the general orientation tool easy to frequent failure and other technical difficulties, Igawa 70601 team adopted a tower block mature tower III wellbore structure, we have used optimization technology of horizontal well trajectory, optimization for ultra deep horizontal well trajectory, reduce borehole curvature, increase the proportion of compound drilling wells, and comprehensively improve the average ROP, horizontal displacement to reach 1489.31 meters and 1137.37 meters of horizontal section length.
Based on the application of conventional drilling technology, Igawa 70601 team based on the tower block reservoir gamma characteristic, comparative data of adjacent wells, early selection and matching the best downhole equipment and bit selection, promotion and application of LWD gamma oriented technology and controlled pressure drilling technology, in order to ensure the reservoir drilling rate and reservoir protection oriented, improve net drilling time and drilling speed. Among them, the fastest machine single PDC bit to 219 hours of pure drilling time and 11.63 mph drilling speed, drilling footage of 2547 meters. Objective layer drilling oil and gas shows 42 layers, pressure control drilling 1410.74 meters, is the tower of middle-aged 4000000 tons capacity building added a high-yield wells.
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