全地层自适应绳索取心钻具割心机构优化

Optimization of core cutting mechanism of all⁃strata self⁃adaptive wire⁃line core drilling tool

我国资源勘探逐渐向深层勘探发展,由于我国地域辽阔,遇到的地层具有相当的复杂性和多样性,给深部资源勘查工作带来较大困难。绳索取心因其“四高、三低、两好”的优点成为目前深部资源勘查工作常用的取心方法之一,但依然存在复杂地层岩心采取率低、内管打捞失败等缺点。为了提高绳索取心钻具在复杂地层的岩心采取率,对S75型钻具的割心机构进行了结构性优化,针对基础设计采用ABAQUS进行动态模拟仿真。结果表明,改进后的钻具尺寸合理,结构紧凑,可以实现采用一套钻具完成复杂地层的取心工作,具有全地层自适应能力,不需在钻遇松散软、硬脆碎地层时更换钻具,有效提高内管打捞成功率。

The resource exploration is gradually developing into deep exploration in China.Due to the vast territory of China,the strata encountered are quite complex and diverse,which brings great difficulties to the exploration of deep resources.Wire‑line coring has become one of the commonly used coring methods in deep resource exploration due to its advantages of“four high,three low and two good”.However,there are still some shortcomings such as low core recovery rate in complex strata and failure of pipe salvage.In order to improve the core recovery rate of wireline coring drilling tool in complex formation,the structural optimization of the cutting mechanism of S75 drilling tool was carried out,and the dynamic simulation was carried out by ABAQUS.The results show that the improved drilling tool has reasonable size and compact structure.It can realize the coring work in complex strata by using a set of drilling tools,has all‑strata self‑adaptive ability;and has the advantages of avoiding the replacement of drilling tools when drilling loose,soft,hard and brittle strata,and effectively avoiding the failure of internal pipe fishing.