地热预查孔深孔段φ131/79 mm取心钻具的研制与应用

摘要:

山西省乡宁县十里铺一带地热资源可行性预查项目预查钻孔，由于深孔段复杂情况，被迫变更钻孔结构，原配置的φ152 mm石油系列单动双管取心钻具无法使用，因此研制了φ131/79 mm单动双管取心钻具，在分析取心钻柱组合力学特性的基础上，通过钻具使用与设备参数调整、钻具水路改进及深孔段取心钻进其它改进措施，使奥陶系及下伏寒武系层位全段不间断取心钻进取得了较好的效果。本文还对该专用取心钻具在深孔段的实际取心效果进行了数据统计与分析总结。

Abstract:

The preliminary survey hole for the geothermal resource feasibility preliminary survey project in the Shilipu area of Xiangning County, Shanxi Province, was forced to change the hole structure due to the complex situation of the deep hole section, which made the original φ152mm oil drilling swivel-type double-tube core drilling tool useless. As a result, a φ131/79mm swivel-type double-tube core drilling tool has been developed. On the basis of analysis of the mechanical properties of the core drilling string, with field use of the drilling tool, adjustment of equipment parameters, and improvement of the drilling tool water passages and other deep hole core drilling aspects, good effect was achieved in continuous coring through the whole Ordovician and the underlying Cambrian layers. In this paper, the actual coring performance of the special core drilling tool in the deep hole section is also statistically analyzed and summarized.