KLA-STOP additive is a liquid polyamine shale inhibitor used in polymer-based drilling and drill-in fluids. The additive inhibits shale or gumbo clays from hydrating and minimizes the potential for bit balling by preventing water uptake by clays and by providing superior cuttings integrity. It can be added directly to the mud system with no effect on viscosity or filtration properties.
| Typical Physical Properties | |
| Physical appearance | Clear, colorless liquid |
| Specific gravity | 1.03–1.075 |
| pH (5% solution) | 9.2–10.2 |
| Flash point | >200 degF (Pensky–Martens closed cup) |
| Viscosity | 80–120 cP at 75 degF [24 degC] |
The additive intercalates and reduces the space between clay platelets so that water molecules will not penetrate and cause shale swelling. Providing a buffered pH in the 9.0–10.0 range, it eliminates any required additions of caustic soda or potassium hydroxide.
Concentrations should be monitored using a filtrate amine titration method; recommended concentration is 1–4% by volume.
For reservoir drill-in fluid applications, compatibility with the reservoir should be evaluated through formation damage testing and filtrate/formation fluid compatibility testing.
It is important to monitor the cuttings condition at the shakers during drilling operations. Cuttings should be firm and dry inside. Sticky and balled-up cuttings may indicate insufficient inhibition from a low KLA-STOP additive concentration. The initial mixture may contain more KLA-STOP additive than specified in the mud program to act as a buffer against high consumption (e.g., 4%–5% by volume).
KLA-STOP additive can also be used as a shale inhibitor in gravel-pack fluids to maintain wellbore stability during high-rate water packs. The concentration is usually 1%–2% for this type of application.
Bioassay information is available upon request. Handle as an industrial chemical, wearing protective equipment and observing the precautions as described in the safety data sheet.
The KLA-STOP additive is packaged in 55-galUS [208-L] drums. It is also available in bulk. Store in dry, well-ventilated area. Keep container closed. Keep away from heat, sparks, and flames. Store away from incompatibles.
Share This
To download this file you first sign in to your Schlumberger account.
Don't have an account? Click below to get started.
Sign In Sign Up for an accountPremium content requires special account permissions. We need a little more information from you before we can grant you access.
Complete account setup