BAKER HUGHES - Drilling Fluids Reference Manual

BOREHOLE PROBLEMS
5. Mix for approximately five minutes after addition of last sack. Mix until the material forms a
smooth blend.
6. When MAGNE-SET accelerator is used, it should be added last to the slurry, mixed just enough for
proper dispersion, and pumped downhole in a non-stop operation.
Note: The weight of the blended slurry should be 14.0 lb m /gal to assure optimum
performance. The weight is reduced by adding water and increased by adding MAGNE-SET.
Typical Pumping Procedure
1. If possible, locate the lost circulation zone.
2. Pull drillstring above the lost circulation zone.
3. Pump the MAGNE-SET slurry into the drillpipe.
Note:
Clean the empty tank or pit with water, or flush with fluid from the active system.
4. Using fluid from the drilling fluid system, pump the MAGNE-SET slurry down to the lost
circulation zone. Pump slurry at maximum rate.
5. If required by hole conditions, the MAGNE-SET slurry can be squeezed into the formation using
standard squeeze procedures.
6. P
ull up above the top of the MAGNE-SET slurry.
7. A
llow MAGNE-SET to cure for eight hours, keeping the annulus full if possible.
X-LINK ® SYSTEM
Baker Hughes Drilling Fluid’s X-LINK system combines advanced, cross-linking polymers
with bridging agents to provide quick, reliable control of fluid loss. In addition, X-LINK offers a
proven means of controlling the more severe circulation losses resulting from large fractures or
vugular spaces.
X-LINK pills are temperature-activated and setting time is controlled through the addition of
accelerator (X-LINK ® ACR) or retarder (X-LINK ® RTR) during mixing, thereby eliminating
the risk of premature setting at the surface or while pumping through the bottom hole assembly.
Mixing Procedure
The mixing of an X-LINK pill does not require any specialized equipment and can be
accomplished at the rig site. A 40 lb. bag of X-LINK makes one barrel of pill. Set-up time is
controlled by the well’s bottom hole temperature (BHT). It is vital that the well’s temperature
profile be known prior to the X-LINK application. A supplemental retarder is required for use in
wells possessing bottom hole temperatures greater than 150º F (65° C). In addition, an
BAKER HUGHES DRILLING FLUIDS
REFERENCE MANUAL
REVISION 2006 7-30