Tech Report Quantity of Mud Lost to Highly Fractured Limestone Reduced by 97%
Circulation was performed at the top of the FORM-A-BLOK AS pill, increasing the flow rate gradually.
Acid-soluble lost circulation pill
The FORM-A-BLOK AS acid-soluble lost circulation pill is a single-sack proprietary blend designed for wellbore strengthening applications and a wide variety of lost circulation scenarios, including fractures and matrix permeability. This product is applied in the form of a pill which, depending on the application, dewaters or deoils rapidly to form a high-strength plug.
The pill can be used in water-base or nonaqueous drilling fluids and at temperatures up to 350 degF [177 degC]. The recommended concentration of FORM-A-BLOK AS pill is 32-lbm/bbl [91-kg/m3] for all fluid densities in freshwater, seawater, or oil- or synthetic-base systems. Mixing a water-base pill will provide the maximum strength. The slurry is weighted with SAFE-CARB ground marble bridging agent. M-I SWACO recommends continuously agitating the pill until it is pumped and pulling the pump screens prior to pumping.
| Density, lbm/galUS [Relative Density] | Freshwater Volume, bbl | FORM-A-BLOK AS Pill Concentration, lbm/bbl | SAFE-CARB 40 Agent Concentration, lbm/bbl |
|---|---|---|---|
| 9 [1.08] | 0.95 | 32 | 14 |
| 10 [1.20] | 0.88 | 32 | 81 |
| 12 [1.40] | 0.75 | 32 | 210 |
| 14 [1.60] | 0.62 | 32 | 340 |
| Density, lbm/galUS [Relative Density] | NAF Volume, bbl | FORM-A-BLOK AS Pill Concentration, lbm/bbl | SAFE-CARB 40 Agent Concentration, lbm/bbl |
|---|---|---|---|
| 9 [1.08] | 0.86 | 30 | 100 |
| 10 [1.20] | 0.80 | 32 | 160 |
| 12 [1.44] | 0.68 | 32 | 280 |
| 14 [1.68] | 0.56 | 32 | 397 |
| Physical Properties | |
|---|---|
| Physical appearance | Gray powder |
| Relative density | 2.50–2.60 |
| Solubility in water | Insoluble |
| Solubility in 15% HCl <212 degF [100 degC] | 92%–96% |
| Solubility in 5% HCl >212 degF [100 degC] | 92%–96% |
Bioassay information is available upon request. Handle as an industrial chemical, wear protective equipment, and observe the precautions described in the material safety datasheet (SDS).
The FORM-A-BLOK AS pill is packaged in 32-lbm [14.5-kg] multiwell paper sacks. Store in a dry, well- ventilated area. Keep container closed when not in use. Store away from incompatibles. Follow safe warehousing practices regarding palletizing, banding, shrink-wrapping, and stacking.
