Institut Francais Du Pe'trole

Guy Pignard

Charles Naville

Christian Wittrisch

Jean Laurent

Jean Gilbert Boulet

Jean Guesnon

Philippe J Staron

Pierre Morin

Claude Mabile

Christian Bardin

Jean Thiery

Michel Chatard

Yves R Ollivier

Olivier Vaisberg

Pierre Guerin

The present invention relates to an instrumentation assembly intended for an offshore riser () operated from a floater (). It comprises a central processing unit (PC) connected by conducting cables () to: The measurements are synchronized with one another, managed and recorded by means of the central processing unit.

Instrumentation assembly for an offshore riser

A VSP or reversed VSP type seismic prospecting method according to the invention allows disturbances contained in seismic recordings produced by tube waves propagating along wells and refracted in zones close to the surface to be minimized. The method disperses a gas under pressure, having preferably a high compressibility, capable of absorbing these tube waves. The gas may be generated by an explosive chemical reaction set off in situ, at a certain depth of the well (which may constitute the seismic wave source). The method has an application for seismic prospecting or drilling noise monitoring.

Seismic prospecting method and device in wells allowing guided waves filtering

As assembly and apparatus for analyzing a physical behavior of a drill string. The assembly includes at least two measuring sensors arranged at each end of a portion of a length of the drill string. A processing installation is provided and is adapted to receive, process, record and synchronize at least one signal coming from the sensor.

System and method for the acquisition of physical data linked to a

The method consists in performing seismic prospecting operations by using a drill bit (1) working at the bottom of a well (2), which generates very powerful acoustic jogs, in transmitting in real time or in delayed time reference signals representative of the jogs of the drill bit picked up in the immediate vicinity thereof by bottomhole sensors and in correlating the seismic signals picked up by a reception set with the reference signals coming from the bottom. The reference signals may be transmitted to the surface station through a line (4) included in a drill string (3). Absorbing elements are preferably interposed on the string to damp the vibrations propagating directly towards the surface along the drill string. Resonant elements and possibly acoustic discontinuity elements favouring resonances in the seismic frequency band may also be interposed.

Seismic prospecting method and device using a drill bit working in a well

A method of and a device for remotely-controlling at least one piece of drill string equipment from an instruction issued from the surface. The method includes issuing from the surface a first information sequence to cause a first predetermined action according to a predetermined sequence, detection of a condition indicative of a second sequence resulting from the first sequence, comparison of this second sequence with another predetermined sequence, and operating the equipment only if there is similarity between the latter two sequences. The method can be applied to actuation of a variable-angle bent element.

Method and device for remote-controlling drill string equipment by a

This device comprises means for handling a flexible elongate member, in combination with means for automatically controlling said handling means in response to a detected deformation of the loop portion formed by the flexible member near the storage basket, so as to bring this loop portion back to a preselected geometrical configuration.

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Rueil Malmaison, France

Guy Pignard