Real-time microseismic navigation for CBM directional drilling

Author:

Luo, Xun

Date of Publication:

2011

Publication Type:

Conference Material

Conference Name:

12th ISRM International Congress on Rock Mechanics, Beijing, China, October 16-21, 2011

Pages:

4

Abstract:

Directional drilling of a deep hole in coal bed methane production can be difficult, risky and costly. One of the key issues to ensure the success of the drilling is the steering of the drill bit to the correct direction. The steering of the drill bit is now based on traditional magnetometer techniques. The disadvantages of this technology are its short survey range (40m) and that it must be operate down in a well if the operating bit is in deep underground. In this paper, microseismic techniques are proposed for the drill bit navigation and results from a trial of a seismic are presented. The results have shown that seismic signals associated with the drilling can be sufficiently detected when the drill bit was more than 120m from the geophones deployed in the target well and the azimuth of in-coming seismic rays can be determined in real-time using seismic waveform polarities. The drill bit location can then be obtained from the azimuth and distance of the drill string inside the coal seam.

Publisher:

ISRM2011

Place of Publication:

China

Field Of Research:

Geophysics not elsewhere classified

Identifier:

EP113581

Publication Sub Type:

Conference Paper - Refereed

Language:

English

ISSN/ISBN:

9780203135

Attribution Statement:

Luo, Xun. Real-time microseismic navigation for CBM directional drilling. In: 12th ISRM International Congress on Rock Mechanics; October 16-21, 2011; Beijing, China. ISRM2011; 2011. 4. csiro:EP113581. http://hdl.handle.net/102.100.100/105336?index=1