国内外割心钻具研发概况与分析

Development and analysis of core catchers

摘要:

在松散、松软、破碎等复杂地层钻进时，与常规取心技术相比，割心技术能够获得更高的岩心采取率。国内外研发的割心钻具主要包括双动双管、单动双管和绳索取心割心钻具3种，钻具研发的关键点主要包括岩心爪结构设计和加压方式选择。从钻具研发情况看，三角形岩心爪具有良好的闭合性能，液力加压能够实现对割心压力的准确控制，绳索取心割心钻具钻进效率较高，但研发难度相对较大。本文详述了国内外割心钻具的结构设计特点及取心操作流程，分析了钻具设计原理的优缺点，提出了割心钻具发展趋势，为割心钻具的优化设计奠定了基础。

Abstract:

Compared with conventional coring technology, when drilling in loose, soft, broken and other complex formation, core catching technology can obtain higher core recovery. The core catching tool developed at home and abroad mainly includes double-tube rigid type, double-tube swivel type and wireline core-catching drilling tools. The key points indevelopment of the tools mainly include the design of the core catcher structure and the choice of the loading mode. Development of the core drilling tools shows thatthe core catcher with the triangle slipshas good closing performance and hydraulic loadingcan be accurately controlled to achievethe core breaking force. Wireline core-catching drilling tools have high drilling efficiency, but the development is relatively difficult. In this paper, the structural characteristics and coring operation procedure of the core-catching drilling tools at home and abroad are described in detail. The design advantages and disadvantages are analyzed and the development trend is put forward. All these lay a foundation for the optimum design of core-catchingdrilling tool.