Institut Francais Du Pe'trole

Claude Putot

Yann Creff

Jean Levine

Francis Biolley

Cédric Le Cunff

Rida Sabri

Method intended for automatic control of an underwater pipe for connecting the lower end of the pipe to a wellhead, wherein the following stages are carried out:

Automatic control methods for positioning the lower end of a filiform structure, notably an oil pipe, at sea

A method for the improvement of performances involves a drilling model wherein the model takes account of the effects of the destruction of a rock (2) by a cutter (1) fastened to a bit body (3) driven in rotation and the effects of the removal of rock cuttings by a fluid, by calculating a material balance from the production of cuttings by the cutter that has penetrated the rock by a depth .delta., a bed of cutting of thickness l, a fluid strip of thickness h between the bed of cuttings and body (3), the fluid strip having a cuttings concentration c.

Growing community of inventors

L'Etang-la-Ville, France

Claude Putot