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深井小井眼定向取心技术是国内独自开辟的一项新技术，它能从定向取心上直接观察深部地层特性和构造形态，还可解释出深部地层裂缝和岩层的产状要素（倾角，倾向），为研究深部地层裂缝性油气藏的分布规律，探明储量提供可靠的原始依据，并以此优选布井方案，提高深井勘探成功率。文章通过介绍深井小井眼定向取心技术原理及小尺寸深井定向取心工具结构特点，对川东大天池９口井眼为φ１５２．４ｍｍ深井应用情况和效果进行了总结分析

APPLICATION AND RESULTS OF DIRECTIONAL CORING IN SMALL HOLE OF DEEP WELL

??Directional Coring in small hole of deep well is a new pioneered technique in China.From the cored rock,formation characteristic and structure style in deep formation can be directly observed;The occurrence factors of either dip angle or inclination involved fracture and stratum in deep formation can be explained well A reliable initial basis,on which a well distribution plan will be optimized to advance the success rate of deep well exploring,is layed out for both distribution pattern and explored reserve of fractured reservoirs.The purpose of this article is to introduce the principle of directional coring and its tools structure function.Through the actual field experiences on nine deep wells,with diameter in 152.4 minimeters,in Datianchi of East Sichuan,the applicaion and its result have been summerized and analyzed to indicate directional coring is an economic.practical and effective method to obtain geological data quickly.