摘要:鉆井取心的目的是提供地下原始資料，同時也是獲取地層中的巖性和地下含油儲量的情況等資料的最直接有效的手段。石油勘探、開發過程都離不開巖心的提取這一步。在開發之前必須要取得完整的第一性資料，只有通過對大量對巖心的分析與研究才能為石油或是天然氣的開采制定合理的開發方案。在本次設計中的保壓密閉取心技術是在保持地層壓力的一種尖端取心技術，它采用了保壓取心工具和封閉的液體，通過在井底高壓的鉆井液驅動下實現內外筒的差動運動來實現關閉內筒的球閥，這樣就可以將巖心密封在內筒中,保證取心過程中巖心中油氣水不流失，保持地層流體和巖心樣本的完整性。當巖心從井底被取出地面后進行冷凍和保存在干冰中。在凍結的情況下，然后可以拆卸內筒并把巖心切成幾個小段帶到實驗室去分析實驗。不論在什么時候保壓巖心必須在干冰中保持冷凍，這樣才會取得具有原始地層壓力的巖心，對取全取準地層資料具有重要意義。因此，不斷的完善改進保壓密閉取心工具顯得十分重要。

關鍵詞：保壓  密封 取心工具 巖心

ABSTRACT:Drilling core purpose is to provide the raw data of the underground, and the formation lithology and underground water reserves in case data such as the most direct and effective means. The extraction of oil exploration and development is inseparable from the core. Must want to get a complete primary data before development, only through the analysis and study of a lot of core ability for the extraction of oil or gas reasonable development scheme. In the design of the holding pressure coring technology is a cutting-edge in keeping formation pressure coring technique, it adopts the pressure maintaining coring tools and closed liquid, through the high pressure of drilling fluid on bottom of inside and outside the cylinder driven by differential movement to realize the closed inner barrel ball valve, so that it can be the core tube, seal, ensure coring in cores in the process of oil and gas is not lost water, keep the formation fluid and the integrity of the core sample. When the core from the bottom hole is removed after the ground were frozen and stored in dry ice. In freezing conditions, then you can remove the tube and the rock eager into several small pieces to the lab analysis experiment. No matter at what time the holding must remain frozen in ice cores, such ability can obtain core with the original formation pressure, to take all take accurate stratigraphic information is of great significance. Therefore, the improvement of the constantly improve the holding pressure coring tool is very important.

Key words:pressure maintaining ;hermetic sealing ;coring tool ;core;