Abstract: As the under-balance and pressure-managing drilling technology develops in the deep-layer, low-permeability, offshore and non-conventional areas, the largest diameter of central pipe and the highest dynamic seal pressure of the existing domestic rotary BOP device meet the current market demand. It is necessary to develop high-pressure and large-diameter rotary BOP that can both seal the 139. 7mm-diameter and 168. 3mm-diameter drilling rods and bear dynamic sealing pressure of 21MPa and static sealing pressure of 35MPa. Based on the rotary BOP of XK35-17. 5/35 type, Chuanqing Drilling & Production Research Institute has innovatively designed the high-pressure and large-diameter rotary dynamic sealing assembly, optimized and designed the hydraulic clamps and shell assembly, upgraded and improved the hydraulic control system, and successfully developed the high-pressure rotary BOP of XK-21/35(220) type. The indoor and field experiments indicate that the rotary BOP of XK21/35(220) type operates normally with an excellent sealing ability and a high operability. All the functional indexes meet the requirements of design.

摘要： 随着欠平衡和控压钻井技术逐渐向“深、低、海、非” 等领域的发展, 现有国产旋转防喷器在中心管最 大通径和最大动密封压力等方面不能满足现场需求, 亟须研制既能随钻密封?139. 7mm、?168. 3mm 钻杆, 又能承受 21MPa 动密封压力、35MPa 静密封压力的高压大通径旋转防喷器。川庆钻采院在XK35-17. 5/35 型旋转防喷器的基础 上, 创新设计了高压大通径旋转动密封总成, 优化设计了液压连接卡箍和壳体总成, 升级改进了液压控制系统, 成功 研制了XK-21/35 (220) 型高压旋转防喷器, 室内及现场试验结果表明, XK-21/35 (220) 型旋转防喷器密封性能良 好, 运转正常, 可操作性强, 各项性能指标达到设计要求。

关键词: 高压旋转防喷器, 旋转动密封, 欠平衡钻井, 控压钻井, 壳体, 卡箍