PREPARATION OF SETTING SLURRIES
First Claim
1. A process of preparing a settable slurry by mixing a solid powder, water and one or more additives, characterised by mixing a tracer material with an additive before mixing that additive with the solid powder and the water and analysing a mixture containing at least the additive and at least part of the water to determine the concentration of tracer therein.
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Accused Products
Abstract
When preparing a settable slurry such as a cement slurry for cementing an oil well, cement or other solid powder is mixed with water and a set retarder. In order to be able to run a convenient and rapid check on the concentration of retarder after dilution at the site of use, a tracer material is mixed with the retarder in known amount during manufacture. The tracer is chosen to enable its concentration to be determined analytically after dilution at the site of use, thereby providing a way to determine the concentration of set retarder after such dilution. The tracer may be a redox-active material and its concentration may be determined by voltammetry. Tracer may likewise be mixed with additives other than set retarder.
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Citations
12 Claims
- 1. A process of preparing a settable slurry by mixing a solid powder, water and one or more additives, characterised by mixing a tracer material with an additive before mixing that additive with the solid powder and the water and analysing a mixture containing at least the additive and at least part of the water to determine the concentration of tracer therein.
Specification