Method of in-situ testing of a drilling fluid
CA 2032747 C · Owner: Sedco Inc. · Inventors: Burgess, Trevor Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The method comprises during a drilling operation wherein the drilling fluid is set moving and the drill string is stationary monitoring the pressure of the , drilling fluid pumped into the drill string depending on the volume of liquid pumped in the drill, string and determining, from the pressure curve a physical property linked to , the, thixotropy of the drilling fluid. An advantage of the invention is that the highest point of the pressure curve indicating the start of the fluid flow into the well is easily visible and , its maximum, value can be measured to find the gel strength specific value.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 19, 1990 and granted March 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.