深水浅软层砂层保形取心钻具设计及应用

Design and application of a conformal coring tool for shallow soft sand layer

摘要:

随着国家资源勘查逐步向深海进军，获取深海地层岩心成为必需。目前，针对海底沉积层、软硬交互等地层已有了成熟的取心钻具，但是，对于浅软层砂层还存在一些技术壁垒。在已有TKP194-80型密闭保压取心工具原理的基础上，针对性设计了超前保形取心钻头、优化了球阀结构、增加了透明衬管以及单向阀机构，形成了球阀翻转式保形取心钻具。该钻具具有对砂层扰动小、防堵等特点，成功在我国南海1500 m以深的超深水油气浅软层砂层进行了试验，取心进尺5.50 m，获取砂层岩心5.00 m，岩心采取率90.91%。突破了超深水浅软层砂层取心的技术难点，可为超深水油气资源勘探开发提供关键技术支撑。

Abstract:

With the development of national resources exploration into the deep sea， it is necessary to obtain the deep sea stratum core.At present，mature coring tools have been developed for seabed sediments， soft and hard alternating strata， etc.However， there are still some technical barriers for shallow soft sand layer.On the basis of the existing TKP194-80 sealed pressure holding principle，the projecting conformal core bit is designed specifically，the ball valve structure is optimized，transparent liner and a check valve are added，the ball valve turn-over conformal coring tool is formed.The coring tool has the characteristics of small disturbance to sand layer， blockage prevention， etc，the test was successfully carried out in the shallow soft sand layer of ultra-deepwater oil and gas at 1500m in the South China Sea，the coring footage was 5.50m， the recovered sand core length was 5.00m， and the core recovery rate reached 90.91%.It breaks through the technical difficulties of coring ultra-deepwater shallow soft sand layer，it can provide key technical support for the exploration and development of ultra-deepwater oil and gas resources.