The Underground Directional Drilling Technology and Equipments for Kilometer Deep Borehole with MWD in Coalmine

Shi, Zhou; Dong, Shuning; Yao, Ningping; Tian, Dongzhuang

doi:10.1016/j.proeps.2011.09.060

Cited by 12 publications

(6 citation statements)

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“…Based on the sensor model, the error model of these sensors can be formulated as the equation of Equation (1). As shown in this equation, the vector v…”

Section: Sensor Model and Error Modelmentioning

confidence: 99%

“…With extensive application of nearly-horizontal drilling equipment in the coal mining industry, in for example the gas drainage, the water detection, and the coal bed methane exploitation, directional drilling technology has made a great development [1][2][3][4][5][6]. In particular, the equipment used for monitoring the state of the borehole and measuring the trajectory of the borehole have been an intensive research subject in recent decades [1]. The core of underground in-seam directional drilling technology is exactly this equipment, namely the Measurement-While-Drilling (MWD) instrument.…”

Section: Introductionmentioning

confidence: 99%

“…(1).As shown in this equation, the vector v s k represents one element in the data set of raw measurements D k {v s kn = (v s kxn , v s kyn , v s kzn ) T |n = 1, . .…”

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confidence: 99%

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A Designed Calibration Approach for the Measurement-While-Drilling Instrument

et al. 2022

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The Measurement-While-Drilling (MWD) system, composed of a tri-axial magnetometer and a tri-axial accelerometer, is widely used in the Horizontal Directional Drilling machine in coal mines. This system can provide attitude information of each measuring point in the borehole, which will eventually allow the trajectory of the borehole to be drawn. The attitude information, however, showed a low-level accuracy, due to the sensor’s imperfection and mounting errors. The accuracy worsened when low-cost sensors were employed, as they had higher random noise. Therefore, an exploration of ways to eliminate the sensor imperfection and mounting tolerance as well as to suppress the noise is needed. In this paper, a feasible calibration approach was designed to address these issues. This new approach combined three foundational calibration algorithms, including the ellipsoidal fitting method, the planar fitting method, and the inner product invariance method. The traditional ellipsoidal fitting method and planar fitting method were optimized by using the recursive least square criterion and omitting the steps of sample data acquisition, respectively. In addition, the noise suppression method was involved in our approach to improve the calibration accuracy. The numerical simulation results showed that the number of sampling points decreased significantly, but the accuracy of the azimuthal angle and the pitch angle fully met the engineering requirements. The experimental results showed that the pitch angle error was reduced by less than 0.5°, and the azimuth error was also reduced by less than 2.5°. It should be noted that this new approach could be implemented without the help of other expensive auxiliary equipment.

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“…Based on the sensor model, the error model of these sensors can be formulated as the equation of Equation (1). As shown in this equation, the vector v…”

Section: Sensor Model and Error Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Designed Calibration Approach for the Measurement-While-Drilling Instrument

et al. 2022

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“…Chen et al (2020) built a multi-physical coupling model to study the failure range and permeability evolution after hydraulic flushing. The technical contents, Shi et al (2011), introduced the features and application of the directional drilling technology and types of equipment and present future work and trends. Liu and Cheng (2014) measured the pressure drops in 54 drainage boreholes of the coal seam and concluded that pressure drop does affect the coal seam gas extraction, the pressure around the borehole increases with increasing borehole depth, and the increment of the pressure becomes larger with enhancing the borehole's drainage effect.…”

Section: Introductionmentioning

confidence: 99%

Exploration and application of microbial method to enhance the effect of hydraulic fracturing on coal seam permeability enhancement and gas extraction

Ma,

Zong

2023

Energy Exploration & Exploitation

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The efficient extraction of gas from low-permeability coal seams is an urgent problem in coal mine safety production. The traditional gas extraction technology generally suffers from problems that limited penetration enhancement or extraction effect, low construction efficiency, large workload, etc. Thus, it is especially urgent and important to explore the new technology applicable to efficient underground gas extraction. In this paper, based on the principle of hydraulic fracturing to increase permeability, we innovatively propose a technique to enhance the effect of hydraulic fracturing to increase permeability and further improve the efficiency of gas extraction using the gas desorption activity of native microorganisms in coal seams. Herein, the composition of the primary microbial community of a coal seam in Xinji No.2 mine was analyzed by bacterial and archaeal 16SrDNA amplicon sequencing, the community structure of the main functional microorganisms was clarified, the optimal combination of functional microorganisms for organic matter degradation in coal seam under anaerobic culture conditions was obtained. Besides the Biolog microplate technology was used to screen the nutrients of the excitation carbon source to stimulate the rapid decomposition of coal organic matter by microorganisms and to define the optimal ratio of the excitation carbon source to microorganisms. Finally, the effect of this technology on the application of coal seam fracturing and gas extraction was tested through field industrial tests, revealing that the extraction effect of this technology was more significant than that of the common coal seam perforation extraction technology. The results of this paper provide a new technical idea for gas extraction from low permeability coal seams, which is an important reference value for subsequent similar studies.

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“…HDD technology (also called trenchless technology) is the most popular method for underground pipeline construction because it causes little damage to the ground, little disturbance to the surrounding residents, has a high efficiency, and is low-cost. HDD technology is also indispensable for the efficient collection of oil and gas, particularly for unconventional gas in low-permeability gas reservoirs, such as coal bed methane [1,2]. …”

Section: Introductionmentioning

confidence: 99%

Horizontal Directional Drilling-Length Detection Technology While Drilling Based on Bi-Electro-Magnetic Sensing

Wang

Wen

Chen

2017

Sensors

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The drilling length is an important parameter in the process of horizontal directional drilling (HDD) exploration and recovery, but there has been a lack of accurate, automatically obtained statistics regarding this parameter. Herein, a technique for real-time HDD length detection and a management system based on the electromagnetic detection method with a microprocessor and two magnetoresistive sensors employing the software LabVIEW are proposed. The basic principle is to detect the change in the magnetic-field strength near a current coil while the drill stem and drill-stem joint successively pass through the current coil forward or backward. The detection system consists of a hardware subsystem and a software subsystem. The hardware subsystem employs a single-chip microprocessor as the main controller. A current coil is installed in front of the clamping unit, and two magneto resistive sensors are installed on the sides of the coil symmetrically and perpendicular to the direction of movement of the drill pipe. Their responses are used to judge whether the drill-stem joint is passing through the clamping unit; then, the order of their responses is used to judge the movement direction. The software subsystem is composed of a visual software running on the host computer and a software running in the slave microprocessor. The host-computer software processes, displays, and saves the drilling-length data, whereas the slave microprocessor software operates the hardware system. A combined test demonstrated the feasibility of the entire drilling-length detection system.

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The Underground Directional Drilling Technology and Equipments for Kilometer Deep Borehole with MWD in Coalmine

Cited by 12 publications

References 0 publications

A Designed Calibration Approach for the Measurement-While-Drilling Instrument

A Designed Calibration Approach for the Measurement-While-Drilling Instrument

Exploration and application of microbial method to enhance the effect of hydraulic fracturing on coal seam permeability enhancement and gas extraction

Horizontal Directional Drilling-Length Detection Technology While Drilling Based on Bi-Electro-Magnetic Sensing

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