MWD tools open window at bit

Journal Article · Mon May 24 04:00:00 EDT 1993 · Oil and Gas Journal; (United States)

OSTI ID:6427951

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), Journal Name: Oil and Gas Journal; (United States) Vol. 91:21; ISSN OIGJAV; ISSN 0030-1388
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
COMMUNICATIONS
COMPARATIVE EVALUATIONS
DATA TRANSMISSION
DESIGN
DEVELOPED COUNTRIES
DIRECTIONAL DRILLING
DRILL BITS
DRILLING
DRILLING EQUIPMENT
ELECTRIC LOGGING
EQUIPMENT
EUROPE
EVALUATION
FIELD TESTS
GAMMA LOGGING
ITALY
MWD SYSTEMS
PERFORMANCE TESTING
RADIOACTIVITY LOGGING
REAL TIME SYSTEMS
RESISTIVITY LOGGING
ROTARY DRILLING
TECHNOLOGY ASSESSMENT
TELEMETRY
TESTING
WELL LOGGING
WELLS
WESTERN EUROPE