海上首口高温高压水平井小井眼打孔管下入技术

Running technology for perforation pipe in the slim hole of the first offshore HPHT horizontal well

魏安超 冯雪松 韩成 李祝军 徐斐

WEI Anchao FENG Xuesong HAN Cheng LI Zhujun XU Fei

中海石油中国有限公司湛江分公司 中海油能源发展股份有限公司工程技术湛江分公司

CNOOC China Limited Zhanjiang Branch, Zhanjiang 524057, Guangdong, China Zhanjiang Branch, CNOOC EnerTech-Drilling &

南海西部东方1-1 气田F7H 井是国内海上首口高温高压水平生产井，F7H 井在?177.8 mm 尾管中使用?148.6 mm 钻头钻达目的层，完井作业需要在?148.6 mm 井眼下入?114.3 mm 打孔管。F7H 井井眼小，井眼轨迹复杂，最大井斜角达到95.1 °，水平段长，目的层岩性复杂，地层温度接近150 ℃，地层压力系数达到1.94。下打孔管作业面临着摩阻扭矩大、井壁易失稳、井控风险高等问题。针对F7H 井打孔管下入难题，计算了管柱下入摩阻，采用抗高温、润滑效果好的钻完井液体系和特殊结构的悬挂封隔器总成，密切监测溢流和井漏，最终成功实施了高温高压水平井小井眼打孔管下入作业。

Well F7H of Dongfang 1-1 Gas Field in western South China Sea is the first domestic offshore HPHT horizontal well. In this well, ?148.6 mm bit is used in ?177.8 mm liner to drill to the target layer, so it is necessary to run ?114.3 mm perforation pipe in ?148.6 mm hole for well completion. Well F7H is characterized by slim hole, complex well trajectory and long horizontal section with maximum hole deviation angle of 95.1°. The target layer is lithologically complex with reservoir temperature about 150 ℃ and reservoir pressure coefficient 1.94. The running of perforation pipe in the hole is faced with large torque and drag, instable borehole wall and high well control risk. To solve these problems, the running friction of pipe string is calculated, the high-temperature lubricating drilling fluid system and the specially structured hanging packer assembly are adopted, and overflow and circulation loss are monitored intently. Ultimately, the perforation pipe running is successfully completed in the slim hole of HPHT horizontal well.

10.13639/j.odpt.2016.06.009