非开挖水平定向钻喷射式反循环扩孔器设计及其排屑性能试验  

Design of Jet Reverse Circulation Reamer for Trenchless Horizontal Directional Drilling and Its Chip Removal Performance Test

作　　者：李信杰 董顺 李志杰 曾聪[1] 马保松 闫雪峰 LI Xin-jie;DONG Shun;LI Zhi-jie;ZENG Cong;MA Bao-song;YAN Xue-feng(Faculty of Engineering, China University of Geosciences, Wuhan 430074, China;School of Civil Engineering, Sun Yat-sen University, Zhuhai 519082, China)

机构地区：[1]中国地质大学(武汉)工程学院,武汉430074 [2]中山大学土木工程学院,珠海519082

出　　处：《科学技术与工程》2021年第21期8779-8788,共10页Science Technology and Engineering

基　　金：国家自然科学基金(41772391)。

摘　　要：为解决大直径水平定向钻扩孔施工中环空岩屑清理困难的问题,基于射流泵原理设计了一种水平定向钻喷射式反循环扩孔器,并通过室内试验研究了其排屑性能。室内试验选取了3种粒径的石英砂颗粒(0.5~1、1~2和2~4 mm),配制了2种不同马氏漏斗黏度的泥浆,采用控制变量法研究了岩屑粒径、泥浆类型、扩孔器转速和岩屑浓度等因素对反循环扩孔器排屑效率的影响。试验结果表明:单纯考虑反循环形成抽吸作用设计的扩孔器,实际排屑效率较低,凸起的牙轮结构搅拌作用和扩孔器与孔壁紧密贴合两方面因素对提高岩屑排除效率有积极影响;在一定条件下,岩屑粒径越小,泥浆黏度越大,岩屑浓度越大,喷射式反循环扩孔器的岩屑排出效率越高;当其他条件一定时,岩屑排出效率在扩孔器转速为40 r/min左右达到最大值;在试验条件允许的范围内扩孔器最大排屑效率高达73.15%,具有很强的实用价值。In order to solve the problem of difficulty in cleaning the annular cuttings in the reaming construction of large-diameter horizontal directional drilling,a horizontal directional drilling jet reverse circulation reamer was designed based on the principle of jet pump,and its chip removal performance was studied through indoor experiments.In the indoor experiment,three kinds of quartz sand particles(0.5~1,1~2 and 2~4 mm)were selected,and two kinds of mud with different Markov funnel viscosities were configured.The influence of cuttings size,mud type,reamer speed and cuttings concentration on the chip removal efficiency of reverse circulation reamer was studied by using the control variable method.The test results show that the reamer designed solely considering the reverse circulation to form the suction effect has lower actual chip removal efficiency.The stirring effect of the convex cone structure and the close contact between the reamer and the hole wall can improve the cuttings.The removal efficiency has a positive effect.Under certain conditions,the smaller the particle size of the cuttings,the greater the viscosity of the mud,and the greater the concentration of the cuttings,the higher the cuttings discharge efficiency of the jet reverse circulation reamer.When other conditions are constant,the cuttings removal efficiency reaches the maximum when the reamer speed is about 40 r/min.The maximum chip removal efficiency of the reamer is as high as 73.15%within the range allowed by the test conditions,which has strong practical value.

关 键 词：水平定向钻 喷射式反循环扩孔器 扩孔器设计 排屑效率 

分 类 号：P634[天文地球—地质矿产勘探]