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首页> 外文会议>SPE/PS-CIM/CHOA international thermal operations and heavy oil symposium and international horizontal well technology conference >Feasibility of Fluid-Jet Based Drilling Methods for Drilling Through Unstable Formations
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Feasibility of Fluid-Jet Based Drilling Methods for Drilling Through Unstable Formations

机译：基于流体射流的钻井方法在不稳定地层中钻井的可行性

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This paper presents the development of fluid-jet methods forrnthe drilling of wells through unstable formations. The workrndemonstrates the technical capabilities of drilling throughrnunstable formations including Methane hydraternand permafrost.rnAbrasive fluid-jet systems are capable of drilling throughrnrocks of all types, and with greater directional control that isrnnot susceptible to the geologically induced deviationsrnencountered with mechanical bits, since no mechanical contactrnis made with the rock while drilling. Abrasive fluid-jets drillrnrock through the erosion induced by very small particlesrnwhich individually remove only small fragments but are inrnsuch numbers that the drilling rate is at or above that ofrnconventional tools. The particles are powered by the velocityrnof the supporting fluid, generated in turn by pumps on thernsurface. The cutting occurs ahead of the nozzle body allowingrna casing to be used which is of a larger diameter than therndrilling assembly itself. Abrasive jets drill through the erosionrnof the rock under the specific impact point of the jet contact.rnThey do not therefore exert significant force to the rockrnaround the drilling point and erode the rock without inducingrngreat disturbance to the surrounding material, thus enhancingrnborehole stability. Fluid-jet methods have the potential ofrnimproving drilling efficiency through unstable formations.
机译：本文介绍了通过不稳定地层钻井的流体喷射方法的发展。这项工作展示了在包括甲烷水合物和多年冻土在内的不稳定地层上钻探的技术能力。磨料射流系统能够在各种类型的岩层上钻探，并且具有更大的方向控制能力，因此不易受到机械钻头引起的地质偏差的影响，因为没有机械接触器与岩石一起钻。磨料射流通过很小的颗粒引起的侵蚀来钻凿岩石，这些颗粒单独地仅除去小碎片，但是数量如此之少，以致钻孔速率等于或高于常规工具的速率。粒子由支撑流体的速度驱动，而支撑流体又由地表上的泵产生。切割发生在要使用的喷嘴体套管之前，该套管的直径比钻孔组件本身的直径大。磨料射流在射流接触的特定冲击点下穿过岩石侵蚀，因此不会对钻探点周围的岩石施加很大的力并侵蚀岩石，而不会引起对周围材料的巨大干扰，从而增强了钻孔的稳定性。流体喷射方法具有通过不稳定地层提高钻井效率的潜力。

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