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Coal Geology & Exploration

Authors

SUN Pinghe, Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, Changsha 410083, China; Key Laboratory of Non-Ferrous Resources and Geological Hazard Detection, Changsha 410083, China; School of Geosciences and Info Physics, Central South University, Changsha 410083, ChinaFollow
ZHOU Shengwei, Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, Changsha 410083, China; Key Laboratory of Non-Ferrous Resources and Geological Hazard Detection, Changsha 410083, China; School of Geosciences and Info Physics, Central South University, Changsha 410083, China
CAO Han, Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, Changsha 410083, China; Key Laboratory of Non-Ferrous Resources and Geological Hazard Detection, Changsha 410083, China; School of Geosciences and Info Physics, Central South University, Changsha 410083, ChinaFollow
GAO Qiang, Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, Changsha 410083, China; Key Laboratory of Non-Ferrous Resources and Geological Hazard Detection, Changsha 410083, China; School of Geosciences and Info Physics, Central South University, Changsha 410083, China
CHENG Gongbi, Jiangsu Gaiya Environmental Science and Technology Co., Ltd., Suzhou 215000, China
ZHANG Hui, Jiangsu Gaiya Environmental Science and Technology Co., Ltd., Suzhou 215000, China

Abstract

In order to solve the technical challenges of inaccuracy and poor credibility of contaminant survey results due to the low accuracy of drilling trajectories in environmental geological surveys, the structural and functional characteristics of the existing direct-push drilling tools were analyzed. On this basis, the method of near-bit measurement while drilling using single-action combination was proposed. An intelligent measurement-while-drilling (MWD) device was developed, a laboratory platform monitoring module was established, a set of monitoring software was developed, and the stability and reliability of the intelligent MWD device was analysed. Then, verification tests have been carried out on the laboratory platforms and in the field separately. The results of the study show that the intelligent MWD device is characterized by lightweight and modular, with an overall length of 300 mm. The device has a stable measurement performance with an accuracy up to 0.01° for the drift angle, azimuth and tool face angle, which can meet the requirements of direct-push drilling guidance, and the single action of the inner tube greatly reduces the disturbance to the sites. Besides, the MWD device can automatically recognize the drilling status at different drift angle thresholds and it is well adapted to the conventional drill pipes, thus suitable for a wide range of direct push drilling scenarios. During the three direct-push drilling processes in the field test, the MWD device showed high stability and allowed continuous direct push drilling at a speed of 1.5 m/min. Generally, the device is capable of meeting the needs of MWD during the direct-push drilling in environmental surveys and provides the equipment basis and data support for the adjustment of the direct-push drilling trajectory. Moreover, the research results are of great significance to improve the accuracy of the direct-push drilling trajectory under non-homogeneous conditions, enhance the credibility of in-situ detection of contaminants in environmental geological surveys, and promote the level of intelligent drilling and surveying integrated technology and equipment for environmental geological surveys.

Keywords

environmental geological survey, contaminated site, drilling trajectory control, intelligent device, measurement while drilling (MWD), direct-push drilling

DOI

10.12363/issn.1001-1986.23.06.0315

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