反钻井施工溜煤眼优化三软煤层工作面运输路线

反井钻机广泛应用于煤矿等行业,通过反钻井施工将2北206工作面运输路线简化,加快了掘进施工速度,施工效率提高,减少了设备的占用、运输环节简化,符合冲击地压矿井限员管理,又减少了人员投入,科学合理分配人员,提高了运输运转系数。

反拉钻井技术在大口径钻孔施工中的应用

在矿山抽放瓦斯、排放矿井水等大口径钻孔正向钻井施工过程中,经常会出现因钻井速度慢而导致钻孔坍塌以及透巷时大量钻井液一次性涌入井下巷道而造成安全事故的现象。因此,采用反拉钻井技术,先打设小孔径先导孔透巷,再将钻头更换为反拉扩孔钻头,从下往上反拉扩孔钻井,解决了大口径正向钻井钻速慢和钻井液一次性涌入巷道的问题,实现了大口径钻孔安全、高效、经济的施工。

我国大直径井筒机械破岩钻井技术与装备新进展

目前以钻孔爆破破岩为主的地下工程井筒施工,形成了伞形钻架钻孔、人工装药、抓岩机装岩、吊桶提升、整体模板砌壁的短段掘砌的普通凿井方法,然而爆破破岩凿井法存在作业工序不连续、作业人员多、职业伤害严重等问题,普通凿井法工序繁杂,难以向无人化和智能化方向发展,亟需突破由不连续的爆破破岩向连续的机械破岩技术转变,实现以机械破岩为基础的安全、高效、绿色、智能化凿井。首先梳理了地下矿物资源开发与地下工程中井筒建设现状,阐述了直径8.5 m竖井钻机钻井、坚硬岩石地层直径4.5 m和软岩地层直径6.0 m的反井钻机钻井、直径5.8 m导井式下排渣竖井掘进机钻井、直径7.83 m机械式上排渣竖井掘进机钻井、直径12.8 m沉井式竖井掘进机钻井和斜井硬岩全断面掘进机钻井等机械破岩装备钻井技术发展与工程实践,提出了机械破岩凿井存在的问题及未来发展方向。

Acoustic reflection well logging modeling using the frequency-domain finite-element method with a hybrid PML

In this paper, we propose a hybrid PML （H-PML） combining the normal absorption factor of convolutional PML （C-PML） with tangential absorption factor of Mutiaxial PML （M-PML）. The H-PML boundary conditions can better suppress the numerical instability in some extreme models, and the computational speed of finite-element method and the dynamic range are greatly increased using this HPML. We use the finite-element method with a hybrid PML to model the acoustic reflection of the interface when wireline and well logging while drilling （LWD）, in a formation with a reflector outside the borehole. The simulation results suggests that the PS- and SP- reflected waves arrive at the same time when the inclination between the well and the outer interface is zero, and the difference in arrival times increases with increasing dip angle. When there are fractures outside the well, the reflection signal is clearer in the subsequent reflection waves and may be used to identify the fractured zone. The difference between the dominant wavelength and the model scale shows that LWD reflection logging data are of higher resolution and quality than wireline acoustic reflection logging.

采区煤仓的设计与施工

通过对中煤大屯公司徐庄煤矿Ⅱ3采区的采区立式煤仓设计与施工分析,反井钻机钻扩孔、钻爆刷大法比传统垛盘反井等施工方法相比具有安全可靠,工人劳动强度低、作业流程顺畅等特点。

Air flow calculation of reverse circulation drilling technique with air DTH hammer

Air DTH hammer has been successfully applied in minor-caliber solid mineral exploration,water-well drilling and other drilling areas. In order to expand the applications of the technology,the authors further studied the principle and analyzed the mechanism of reverse circulation drilling technique with air DTH hammer to get the perfect assembles of equipments by optimizing working parameters. No parameter seemed more important than the air volume because it could maintain the working performance stability. The minimum air volume is related to the parameters such as depth and pressure,which was calculated under the actual conditions. It was solved for the air injection flow tables of the air DTH Hammer working at the different pressures. According to the data tables,operators could adjust the air volume to meet the demand on this technique,which had a realistic guiding significance. So it could build up a set of systematic and complete hi-technique.

Study on drilling mechanism and optimization of percussion-extruding DTH hammer bit

The authors tested the percussion-extruding Down-the-hole(DTH)hammer bit with five different structures and mainly analyzed the drilling mechanism between conical bit and stepped bit.In addition,aiming at "the pile effect" in combination with the advantage of stepped bit,we design a new cam spinning bit and test it outdoors.The result shows that using cam spinning bit can solve the problem of "the pile effect",which can also obtain higher drilling efficiency than using conical bit in high confining pressure strata.It is characterized by novel structure and high drilling speed as well as good guiding,and it is significant for improving efficiency in percussion-extruding drilling technique.

Self-adaptive inversion method of electromagnetic-propagation resistivity logging while drilling data

Because of the constraint mode of the inversion objective function in the traditional resistivity-inversion method of electromagnetic-propagation resistivity logging while drilling(EPR-LWD),obvious differences appear in the radial and vertical investigation characteristics between the amplitude-ratio and phase difference,which affect the practical application of EPR-LWD data.In this paper,according to the EPR-LWD data,a self-adaptive constraint resistivity-inversion method,which adopts a self-adaptive constraint weighted expression in the objective function to balance the contributions of the phase difference and amplitude attenuation,is proposed.A particle swarm optimization algorithm is also introduced to eliminate the dependence of the accuracy and convergence on the initial value of the inversion.According to the inversion results of multiple classical formation models for EPR-LWD,the differences between the adaptive constraint inversion-resistivity logs with the traditional amplitude-ratio and the phase difference of the resistivity logs are discussed in detail.The results demonstrate that the adaptive resistivity logs take into account the advantages of the amplitude-ratio logs in the radial investigation and phase difference logs in the vertical resolution.Further,it is superior in thin-layer identification and invasion-effect appraisal compared with the single-amplitude-ratio and phase difference logs.The inversion results can provide a theoretical reference for research on the resistivity-inversion method of electromagnetic wave LWD.