Development of modifications for Coflexip flexible drilling pipe for high-temperature and -pressure geothermal service. Final report

Technical Report · Tue Feb 01 00:00:00 EST 1983

DOI:https://doi.org/10.2172/6345540· OSTI ID:6345540

Friese, G J

Coflexip (France) flexible drilling pipe can provide economies in drilling geothermal wells. However, the current liner materials cannot take the high temperatures (approx.250C) and pressures (approx.69 MPa). Development was undertaken to replace the liner with higher temperature materials and, thus increase the temperature capability of the flexible pipe. DuPont Teflon PFA 350, L'Garde EPDM Y267 and L'Garde AFLAS 291 were considered but they all require backing by a closely woven stainless steel fabric to prevent extrusion. A graphite-reinforced EPDM elastomer was developed which has the potential of meeting the pressure-temperature requirements without the metal fabric reinforcement.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6345540
• Report Number(s): SAND-82-7203; ON: DE83009393
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
DRILL PIPES
LINERS
MODIFICATIONS
ELASTOMERS
GEOTHERMAL WELLS
GRAPHITE
HIGH PRESSURE
HIGH TEMPERATURE
STAINLESS STEELS
ALLOYS
CARBON
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
DRILLING EQUIPMENT
ELEMENTAL MINERALS
ELEMENTS
EQUIPMENT
IRON ALLOYS
IRON BASE ALLOYS
MINERALS
NONMETALS
PIPES
POLYMERS
STEELS
WELLS
Geothermal Legacy
150901* - Geothermal Engineering- Drilling Technology & Well Hardware