gas drainage drill rod

The efficiency of coal seam gas drainage can be further improved by the accurate mastery of the gas evolution principle during gas drainage from the drill hole along the coal seam and reasonable optimization of borehole layout spacing. Based on the actual geological conditions of the no. 2 coal seam in a coal mine in Guizhou, China, and relevant control …

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HQ drill rods (88.9 mm OD x 77.7 mm ID) are a standard rod used for over-coring CHD 69.9 ... long gas drainage boreholes which had been drilled from 2CT, B Heading. When the compliance cores at 271.5 m, 385.5 m and 500 …

Abstract. The trajectory of the actual gas drainage drilling often deviates from the design in the process of gas control drilling construction, resulting in the …

Gas drainage drilling is the fundamental guarantee for gas drainage effect. However, in the process of drilling construction, due to the influence of various factors …

Advanced directional drilling technology for gas drainage and exploration in Australian coal mines. Naj Aziz. 2011, Procedia Engineering. See Full PDF Download PDF.

In view of the potential safety hazards such as gas-shot, gas-outburst and personal injury in the construction of gas drainage and drilling in coal mine, ... Yu W. and lin C.H.S. 2014 Research on Self-adaptive Positioning Technology for Rod-feed Mechanism of Remote-controlled Drilling Machine Mining Safety and Environmental Protection 41 …

Abstract. Gas drainage through underground boreholes is the main method for gas control and utilization in soft high gassy seam. However, this method has …

Present situation and Prospect of Coal Mine Gas drainage Technology and equipment in China [J]. Coal Mine Safety, 2020 and 51 (10): 67-77. Google Scholar; ... Investigation on sticking for drill rod based on finite element analysis and fuzzy proportionâ integrationâ differentiation:[J]. Advances in Mechanical Engineering,2019,11(10).

The practice of gas drainage in Baijigou Coal Mine indicates that underground longhole in-seam directional drilling technology is an effective way to drain …

Features. Coil Tube Drilling: The Gas Drainage Saviour? Coil tube drilling could be the answer to draining gas from mines in a more efficient, accurate and safe …

The oil cylinder provides force for the drill rod to move toward the bottom of the borehole or retreating. All the oil pipes are organized in the control panel, and then linked to the motor or cylinder. ... Study on the reasonable sealing depth of gas drainage drilling in coal seam. Shanxi Coking Coal Sci. Technol., 11 (2013), pp. 24-27. View ...

The mines that operate in this area have, since 1980, relied on the use of extensive underground to inseam (UIS) drilling to drain gas both ahead of advancing roadway development (pre-drainage) and following longwall coal extraction (post-drainage). The primary role of pre-drainage is to reduce the gas content of the coal seam to be …

Gas drainage parameters include borehole length, borehole diameter, borehole spacing, the drainage time, and the negative drainage pressure. 28−31 Borehole layout parameters are important parameters that affect the gas drainage compliance as well as the gas drainage efficiency. 32−34 In terms of gas drainage drilling …

Gas drainage through in-seam borehole is the most effective means to prevent gas ... of drill rod are guaranteed by optimal material and advanced process. It is shown as Fig. 3.

Gas Evolution Principle during Gas Drainage from a Drill Hole along the Coal Seam and Reasonable Borehole Layout Spacing. Yutian Wang*, Xun Zhao*, Pengfei Wang., and. …

The gas drainage drilling construction was carried out in the 40111 wo rking face No. 2 drilling site. A . ... drill rod on gas drainage drilling rig [J] Industry and Mine Automation 44 (2): 63-67.

Gas drainage drilling is the fundamental guarantee for gas drainage effect. However, in the process of drilling construction, due to the influence of various factors such as lithological changes, drilling tool structure, weight of the drill rod, drilling process, construction technology and other factors, the actual trajectory of the drill hole ...

The invention relates to a special-shaped milling cutter wheel for a gas drainage drill rod. A groove, the shape of which is the same as that of a part of cross section of a drill rod, is formed in the outer circumference of a milling cutter wheel body; a milling cutter, the shape and the size of the cutting edge of which are coincident with the shape and the size of a …

The key components of the OMP were: (1) drilling boreholes on a proposed design layout to effect gas drainage; (2) monitor gas flows from the boreholes to assess …

In the CRC coil tube rig, the drill string is a continuous 700m metal tube that is wrapped around a drum. As the hole is drilled, the coiled tube is unwound from the drum, straightened through a set of rollers and fed into the hole by the injector. The CTD could cut drilling costs by at least 15% by saving time on assembling the drill string ...

The invention discloses a drill rod linear driller for mine gas drainage under suction and an operation method of the drill rod linear driller. The drill rod linear driller is characterized in that: 4-8 pairs of alloy steel bars are uniformly welded on a cylindrical body with a central hole at intervals in the longitudinal direction; a plurality of alloy blocks which are welded …

A drilling rod target detection and segmentation technology based on generating adversarial network demonstrates high accuracy and robustness even in dark and dusty environment, better than other commonly used segmentation networks. During the process of gas hole drilling, automatic loading and unloading drilling rod by robotic …

The widespread application of directional drilling technology has greatly improved the safety and efficiency mining in these countries. 2.2. Advances in gas drainage technique …

The utility model relates to a gas drainage drill pipe. A bolt joint, a nut joint and a rod body of a drill pipe are formed into an integrity structure machined by a steel tube. A reinforcement tube used for strengthening the intensity of the bolt joint is placed inside the bolt joint in sleeved mode. An outer end of the reinforcement tube is welded at an outer …

Abstract and Figures. In this paper, research was carried out on borehole protection technology using screen pipes, aiming to address the problems of gas drainage borehole collapse and low gas ...

Gas drainage through in-seam borehole is the most effective means to prevent gas disaster in coalmines of the world [1]. Since the nearly horizontal directional drilling (HDD) has the Corresponding author. ... reliable work, and easy movement. 2) The drill rod with cable assembly inserts is high-strength and has the ability of reliable ...

Gas Drainage. Removal of gas from the coal seam and surrounding strata has proven to be an effective method in reducing or eliminating outbursts. The benefits of gas drainage are: Gas given off from the coal is …

Knowledge of the directional drilling process by the reader is assumed, but some review may be of value in establishing common terminology. Briefl y, the HDD process begins with boring a small, horizontal hole (pilot hole) under the crossing obstacle (i.e. a highway) with a continuous string of steel drill rod. When the bore