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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征和构造形态，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，进一步阐明该技术是直接获得地质资料的一种经济、实用、快速、有效的方法。
Directional coring of deep well and slim hole is a newly developed technology in China. It can directly observe deep stratigraphic features and tectonic forms from directional coring, and can also explain deep layers of formation fractures and formation elements (inclination, tendency ), To provide a reliable and original basis for the study of the distribution of fractured reservoirs in deep formations and proven reserves, and to optimize the well layout plan to improve the success rate of deep well exploration. By introducing the principle of directional coring in deep wells and the structural features of small-sized directional coring tools in deep wells, the paper analyzes and summarizes the application and effect of 9 wells in Deep Tianchi, eastern Sichuan Province, for φ152.4mm deep wells, and further clarifies that this technique is An economic, practical, rapid and effective method of obtaining geological data directly.