苏里格致密气藏超长水平段水平井钻井完井关键技术

针对苏里格气田致密气藏超长水平段水平井钻井完井过程中循环泵压高、摩阻扭矩大、机械钻速低、井眼清洁困难、完井套管柱下入困难等问题,分析了超长水平段水平井钻井完井技术难点,进行了高效钻具和钻井设备优化配置、井眼轨道设计和井眼轨迹控制、水平段钻井提速和清洁,以及旋转导向钻井、强抑制润滑性水基钻井液和"旋转引鞋+套管"漂浮下入...

Key Technologies for Drilling and Completing Horizontal Wells with Ultra-Long Horizontal Sections in the Sulige Tight Gas Reservoirs

The drilling and completion of horizontal wells with ultra-long horizontal sections in the tight gas reservoirs of Sulige Gas Field is subject to problems such as high circulating pump pressure, large friction torque, low rates of penetration (ROP), difficult borehole cleaning, and difficulties in running the completion casing string. In response, the technical difficulties in the drilling and completion of such wells were analyzed. Research was conducted on technologies such as optimized allocation of high-efficiency drilling tools and equipments, borehole trajectory design and control, horizontal section drilling acceleration and cleaning, rotary steering system (RSS) drilling, strong inhibition and lubrication water-base drilling fluid, and “rotary guide shoe + casing” floating running, etc. The key technologies for drilling and completing horizontal wells with ultra-long horizontal sections in the Sulige tight gas reservoirs were developed and applied in 2 wells with an average well depth of 7 027 m and an average horizontal section length of 3 719.5 m. The drilling cycle was 50.93 d, which meant that the proposed technologies achieved a favorable effect. Between the two wells, the Well Jing50-26H1, with a total depth (TD) of 7 388 m and a horizontal section length of 4 118 m, established the records as the deepest well in Changqing Oilfield and the longest horizontal section of onshore oil and gas wells in China at that time. The research and application show that the key technologies can provide technical support for the efficient exploration and development of the Sulige tight gas reservoirs and a reference for safe and efficient drilling and completion of horizontal wells with ultra-long horizontal sections in tight gas fields in China.