绳索取心工艺在大口径深部钻探中的应用研究

Application of the Wire-line Coring Technique to Large-Diameter Deep Drilling

绳索取心工艺具有效率高、取心质量好等优点,所以,在小口径固体矿产钻探工程中已得到推广应用。但是,在沉积地层大口径深孔钻探中应用较少。文中针对绳索取心和石油钻井工艺各自优缺点,提出了增加钻孔和钻具的环空间隙,采用大泵量、高上返速度的石油钻井和绳索取心"二合一"钻探技术思路,结合河南叶舞凹陷盆地2630m盐矿(地热)勘探孔进行了生产性试验,就试验中存在的主要问题进行了分析研究,并提出了具体措施。通过试验证实:绳索取心技术在大口径深部钻探工程应用可行,且具有成本低、安全可靠等优点;同时,增加泵量和环空间隙可以避免岩屑重复破碎,从而可大幅度提高钻探效率。

Because of its high efficiency and good coring quality, the wire - line coring technology widely applied to small diameter solid mineral drill- ing projects. It is, however, little used in large - diameter deep - hole drilling in sedimentary strata. Considering the advantages and disadvantages of wire - line core drilling and oil drilling technology, this paper proposes the idea of increasing the gap between hole and drill tools and using the oil drilling technique with large pump capacity and high return speed, and the wire - line coring ＂two - in - one＂ technology. From production test at a 2630m depth salt mine（geothermal） exploration hole in the Yewu sag basin of Henan Province, this paper analyzes the main problems during the test following the idea aforementioned, and then proposes detailed measures to solve them. The test proves that the wire - line coring technology used in large - diameter drilling is feasible, and exhibits its merits such as low cost, safety and reliability. Meanwhile, increasing the pump capacity and enlarging the gap between hole and drill tools can avoid the drilling cuttings crushing repeatedly, thus the drilling efficiency can be highly improved.