召51-38-9H2井二开水平井钻井技术

Double-Open Horizontal Well Drilling Technology for Well Zhao 51-38-9H2

苏里格气田位于鄂尔多斯盆地中部,勘探面积约5 ×104 km2以上,是我国陆上储量规模最大、产量最高的致密砂岩天然气气田。但其单井产量低、递减速度快,制约气田的发展,水平井可大大提高单井产量和采收率。二开水平井与三开水平相比,可节约一层技术套管,节约钻井成本15%。本文针对召51-38-9H2二开水平井钻井刘家沟组井漏、石千峰组井塌、水平段托压严重、井眼清洁困难、完井套管下入困难、固井优质率低等难点,通过承压试验、优化井眼轨道、新型减摩降阻工具、优化钻具组合、盐水低固相钻井液体系、套管居中等配套技术措施,水平段达到1300 m,取得了二开水平井关键技术突破。

Sulige gas field is located in the middle of Ordos Basin with an exploration area of more than 5 ×104 km2. It is a tight sandstone gas field with the largest reserves and highest production in China onshore. However, the low production and fast decline rate of single well restrict the development of gas field. Horizontal well can greatly improve single well production and recovery factor. Compared with the triple-open horizontal well, the double-open horizontal well can save one layer of technical casing and 15% of drilling cost. This paper focuses on the drilling difficulties of dual-opening horizontal well Zhao 51-38-9H2 such as Liu Jiagou group lost circulation, Shifeng, borehole collapse, severe horizontal section pressure, hole cleaning, completion casing down into difficulties, low cementing perfection rate, the horizontal section of the horizontal well has reached 1300 meters through the pressure test, the optimization of borehole trajectory, new type of anti-friction resistance reduction tool, optimized drilling assembly, salt low solid drilling fluid system, casing center form a complete set of technical measures. The key technology breakthrough of the two horizontal wells has been made.