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Title: A self propelled drilling system for hard-rock, horizontal and coiled tube drilling

Several advancements are needed to improve the efficiency and reliability of both hard rock drilling and extended reach drilling. This paper will present a Self Propelled Drilling System (SPDS) which can grip the borehole wall in order to provide a stable platform for the application of weight on bit (WOB) and resisting the reactive torque created by the downhole drilling motor, bit and formation interaction. The system will also dampen the damaging effects of drill string vibration. This tool employs two hydraulically activated anchors (front and rear) to grip the borehole wall, and a two-way thrust mandrel to apply both the drilling force to the bit, and a retraction force to pull the drill string into the hole. Forward drilling motion will commence by sequencing the anchor pistons and thrust mandrel to allow the tool to walk in a stepping motion. The SPDS has a microprocessor to control valve timing, sensing and communication functions. An optional Measurement While Drilling (MWD) interface can provide two-way communication of critical operating parameters such as hydraulic pressure and piston location. This information can then be telemetered to the surface, or used downhole to autonomously control system parameters such as anchor and thrust force ormore » damping characteristics.« less
Authors:
;
Publication Date:
OSTI Identifier:
603431
Report Number(s):
DOE/EE--0139; CONF-970376--
ON: DE98001891; TRN: 98:001819-0017
Resource Type:
Conference
Resource Relation:
Conference: 15. US Department of Energy`s geothermal program review, San Francisco, CA (United States), 24-26 Mar 1997; Other Information: PBD: 1997; Related Information: Is Part Of Role of research in the changing world of energy supply. Proceedings geothermal program review XV; PB: 347 p.
Research Org:
USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; 58 GEOSCIENCES; GEOTHERMAL ENERGY; GEOTHERMAL WELLS; WELL DRILLING; TECHNOLOGY ASSESSMENT; DIRECTIONAL DRILLING; GEOTHERMAL INDUSTRY; MWD SYSTEMS; DRILLING EQUIPMENT Geothermal Legacy