If losses occur in reservoir sections, the following options are available:
As a first step, the mud gradient shall be reduced, formation pressures permitting.
If the gradient reduction provides no benefit, then use CaCo3 LCM material as follows:
Formulation and Mixing Procedure for LCM Pills
Calcium Carbonate shall be applied according to the details in the following table:
|
Loss Rate < 12 bbl/hr |
Loss Rate 12 – 22 bbl/hr |
Loss Rate 22 – 44 bbl/hr |
|||
|
Size |
Conc. |
Size |
Conc. |
Size |
Conc. |
|
50 micron |
Add to circ system at |
50 micron |
15 ppb |
50 micron |
15 ppb |
|
|
4 – 5 x 25 kg sx/hr |
150 micron |
15 ppb |
150 micron |
15 ppb |
|
|
|
|
|
600 micron |
15 ppb |
Notes:
The material is totally soluble in HCl.
If all else fails then consider drilling blind to TD.