MWD tools open window at bit
A new measurement-while-drilling (MWD) system takes resistivity and directional measurements directly at the bit, allowing drillers and geologists to 'see' the true direction and inclination of the bit with respect to the formation drilled. With real-time resistivity measurements at the bit (RAB), the formation is logged before fluid invasion occurs and the driller can steer directional wells more accurately than with conventional MWD tools. The MWD tools comprise an instrumented steerable motor and an instrumented near-bit stabilizer for rotary drilling. The tools have sensors for resistivity, gamma ray, and inclination located in a sub just behind the bit. The integrated steerable system was successfully tested in the Barbara 79 D well offshore Italy and in the Cortemaggiore 134 D well in northern Italy in November, 1992. This paper describes the system and its advantages over conventional MWD tools.
- OSTI ID:
- 6427951
- Journal Information:
- Oil and Gas Journal; (United States), Vol. 91:21; ISSN 0030-1388
- Country of Publication:
- United States
- Language:
- English
Similar Records
Development of a near-bit MWD system. Phase 2 -- Final report
MWD technology comes of age
Related Subjects
MWD SYSTEMS
DESIGN
WELLS
DIRECTIONAL DRILLING
RESISTIVITY LOGGING
COMPARATIVE EVALUATIONS
DRILL BITS
FIELD TESTS
GAMMA LOGGING
ITALY
PERFORMANCE TESTING
REAL TIME SYSTEMS
ROTARY DRILLING
TECHNOLOGY ASSESSMENT
TELEMETRY
COMMUNICATIONS
DATA TRANSMISSION
DEVELOPED COUNTRIES
DRILLING
DRILLING EQUIPMENT
ELECTRIC LOGGING
EQUIPMENT
EUROPE
EVALUATION
RADIOACTIVITY LOGGING
TESTING
WELL LOGGING
WESTERN EUROPE
020300* - Petroleum- Drilling & Production