BAKER HUGHES - Drilling Fluids Reference Manual

TABLE OF CONTENTS
10000
x
5000
2500
HPLC Water
10 % NaCl
10 % NaCl/30% NF2
20% NaCl
20% NaCl/ 10 % NF2
23% NaCl
23% NaCl/30% HF100
x 10% NaCl/40% NF2
23% NaCl / 30% NF2
1000
**
30 35 40 50 60 70 80 90 100
Temperature (F)
Potential Hydrate Formation
GAS HYDRATES IN THE BOP
** No Hydrate Formation
w/ 23% NaCl / 30% NF2
at 10,000 PSI & 30 F
Hydrates are most likely to form in the choke & kill lines and the BOP, as these are exposed to the
lowest temperature and the highest pressures. The plugging of the well control equipment presents the
greatest hazard potential. In order to prevent hydrate formation during a kick situation a suitable fluid
may be spotted across the BOP and in the choke and kill lines. It is recommended to spot a suitable
fluid across the BOP in the event of a gas kick
Spotting Procedure
1. Close lower-most pipe rams. In this manner, the kill line, BOP stack (above lower pipe rams),
and choke line can be displaced
2. Displace kill line and BOP stack with predetermined strokes. Once the fluid has cleared upper
annular preventers, close preventers, open choke line, and displace same.
3. Close pipe rams above and closest to choke line and begin well killing procedure,
4. After the well is dead, there is potential for trapped gas above the closed pipe rams and below
the annular preventers. A rapid expansion could cause riser collapse.
Procedure For Evacuating Gas From The BOP
1. Close bottom-most pipe rams and annular preventers.
2. Pump mud through the kill line. When this pill returns at the choke line, stop pumping.
3. Allow any gas to evacuate from the stack taking returns to the gas buster.
4. Displace the kill line, BOP stack and choke line with kill weight mud.
5. Open annular preventer, close diverter bag (i.e. diverter lines are open), and displace riser
with kill weight mud.
6. After riser has been circulated with kill mud, open lower pipe rams and check for flow.
BAKER HUGHES DRILLING FLUIDS
REFERENCE MANUAL
REVISION 2006 13-19