摘要
南堡油田深层潜山裂缝发育,压力窗口窄,完井过程中易出现又漏又涌、气液置换严重等现象。为确保完井井控安全,减少储层污染,在进行准177.8 mm尾管回接前,需采用封层技术将上部井筒与潜山油气层进行有效隔离。南堡潜山常用的封层工艺是使用机械式桥塞密封井筒,应用中多次出现桥塞坐封和打捞失败的现象。为提高封层效果,减少施工风险,研发出一种新型化学材料代替机械桥塞,该材料在井筒高温下能迅速团聚成塞,承受较高的温度和压力,并且易降解。现场试验表明,该化学桥塞抗温性能好,能长时间有效密封井筒,实现碳酸盐岩储层保护,与常规桥塞封层技术相比,节约了钻塞或打捞回收桥塞的时间,大大降低了完井成本。
The appearances during well completion were well kick, lost circulation, and the gas-driving-wate-out because of formation fracture growing and narrow pressure window. In order to ensure the well control safety and reduce the formation damage, the sealing technology is adopted to isolate upper wellbore from buried hill reservoir. The common sealing technology in Nanpu Oilfield is using mechanical bridge-plug, and the phenomenon of the setting and salvage failure has occurred many times in the application. To improve the sealing effect and reduce the construction risk, a new type of temperature-tolerant chemical bridge-plug has been developed. The principle is that a chemical material which can form bridge-plug by aggregating at high temperature is injected into the sealing place. The chemical bridge-plug with high temperature and high pressure can be easily degraded. The field testing shows that the chemical bridge-plug exhibits excellent thermostability and seals the wellbore effectively for a long time. Compared with conventional technology, the material bridge-plug sealing technology can save the time of drilling and salvage plug. It can reduce completion cost.
出处
《断块油气田》
CAS
北大核心
2016年第4期533-536,共4页
Fault-Block Oil & Gas Field
基金
国家科技重大专项"渤海湾盆地黄骅坳陷滩海开发技术示范工程"(2011ZX05050)
关键词
桥塞
化学桥塞
封层技术
完井
南堡潜山
bridge-plug
chemical bridge-plug
sealing technology
well completion
buried hill reservoir in Nanpu Oilfield
