G-Seal
Sized graphite bridging agent
Plugging agent bridges and seals permeable and fractured formations for drilling applications.
Challenge: All offset wells drilled in this area of the Taranaki basin had experienced problems coming out of the hole after trouble-free drilling of the 12¼-in. section.
Solution: Maintain the selected KCl/IDCAP D/GLYDRIL mud system and add G-SEAL graphite.
Results:
Well Information | |
---|---|
Well Information Location | New Zealand |
Well Information Well type | Exploration |
Well Information Hole angle range | 0° |
Well Information Borehole static temperature | 250°F (121°C) |
Well Information Well depth | 12,844 ft (3915 m) |
Well Information Section drilled | 7923 ft (2415 m) |
All offset wells drilled in this area of the Taranaki basin had experienced problems coming out of the hole after trouble-free drilling of the 12¼-in. section. No problems were experienced during drilling, although stick-slip was always high and torque erratic. Trips, however, were extremely slow since it was necessary to backream most of the way. Following this backreaming, the hole was always in good condition and no further problems were experienced running in or pulling out. Casing was always run to total depth without problems. Because it was agreed that mud weight was not an issue, the client asked for suggestions to make the trip out faster.
Since there were no other hole problems, it was decided to maintain the selected KCl/IDCAP* D/GLYDRIL* mud system. It was proposed to add G-SEAL graphite to the mud at a concentration of approximately 2 lb/bbl (5.7 kg/m3) while drilling the section with a further boost to around 5 lb/bbl (14.3 kg/m3) before tripping in an attempt to lubricate (“slicken up”) the filter cake.
The fluid properties are shown in Table 1.
If you’d like to know more about the G-SEAL product and how it’s performing for our other customers, please call the SLB office nearest you.