随钻防漏堵漏技术的研究与应用进展

RESEARCH AND APPLICATION OF LEAK RESISTANCE AND SEALING TECHNOLOGY WHILE DRILLING

井漏是钻井作业中长期存在并且尚未得到有效解决的技术难题。文章介绍了目前国内外随钻防漏堵漏技术的研究与应用现状及常规处理井漏的方法,针对渗透性漏失及裂缝性漏失地层特点,首次提出了基于物理法随钻防漏堵漏技术。该技术通过特殊的井下侧向水力工具,利用旋转射流的水力能量作用在井壁上形成渗透率接近于零的滤饼,即所谓“人造井壁”。井壁不仅渗透率极低,而且具有很高的强度和稳定性,能够承受一定的压差作用。在井眼内可以有效的阻止钻井液漏入地层,从而达到随钻防漏堵漏目的。

This article introduced the research and application of leak resistance and sealing technology while drilling at home and abroad,and conventional method of dealing with lost circulation. Based on the fractures of penetrability formation and fissured formation, the leak resistance and sealing technology while drilling was put forwards based on physical method. This technique uses revolving jet water power energy by distinct downhole latered water power tool, to form the mud cake of permeability near to zero, namely man-made sidewall. The sidewall not only has very low permeability, but also has very high intensity and stability, could resist certain pressure difference, effectively prevent drilling fluid into formation in borehole, as a result, the goal of leak resistance and sealing while drilling was achieved.