埕海一区大位移水平井摩阻扭矩研究与应用

Research on torque and drag in extended-reach horizontal wells and its application in Chenghai-1 area

李娟 唐世忠 李文娟 杨涛 付建红

LI Juan TANG Shizhong LI Wenjuan YANG Tao FU Jianhong

大港油田公司采油工艺研究院，天津　300280 西南石油大学，四川成都　610500

Research Institute of Production Technology, Dagang Oilfield Company, Tianjin 300280, China Southwest Petroleum University, Chengdu 610500, China

大港油田埕海一区庄海8井区按照“海油陆采”模式采用大位移井技术进行开发，针对大位移井钻井难点，开展摩阻扭矩预测技术研究。根据钻成的水垂比为3.92的庄海8Nm-H3大位移水平井实钻摩阻扭矩数据，通过建立大位移井摩阻扭矩预测模型，确定了现有钻井液体系和性能条件下的摩阻系数。分析了减摩工具、钻井液体系、井眼轨迹、钻柱结构及井眼净化等对摩阻扭矩的影响，使用与庄海8Nm-H3井类似的井身结构、钻具组合及钻井液体系及性能，采用相同的管内和裸眼摩阻系数，计算了水垂比为3.1、3.5、4、4.5、5的大位移井摩阻扭矩，结果表明，在大港油田埕海一区能够完成水垂比为5的大位移水平井施工。

According to the “sea of oil land development” model, the extended-reach well technology is used for the development of the Zhuanghai 8 well of Chenghai-1 area in Dagang Oilfield. To solve the difficulties drilling extended-reach wells, technological research of predicting torque and drag is launched. In accordance with the torque and drag data of the Zhuanghai 8Nm-H3 extended-reach horizontal well, of which the H-V ratio is 3.92, the friction coefficient, under the existing condition and performance of the drilling fluid system, is confirmed, by establishing models for predicting torque and drag of extended-reach wells. The effect of friction-reducing tools, drilling fluid system, well trajectory, drill pipe system and hole cleaning on torque and drag is analyzed. The torque and drag of the extended-reach wells with the H-V ratio being 3.1, 3.5, 4, 4.5, and 5 respectively is calculated, by using the well structure, bottomhole assembly, drilling fluid system and its performance similar to that of Zhuanghai 8Nm-H3 well and the same pipe and open hole friction factors. Results show that the construction of extended-reach wells with H-V ratio higher than 5 may be fulfilled in Chenghai-1 area in Dagang Oilfield.