Abstract: The invention relates to an internal-combustion engine, notably an indirect-injection supercharged engine, that can run with a burnt gas scavenging stage, comprising at least a cylinder (10) including a combustion chamber (12), non-carbureted air intake passage (16) with an air intake valve (24), carbureted air intake passage (14) with a carbureted air intake valve (22), burnt gas exhaust passage (28) with an exhaust valve (32), an exhaust camshaft (36) for controlling the exhaust passage (28), an intake camshaft (44) for controlling the air intake passage (16) and the carbureted air intake passage (14).

Abstract: The present invention is a device for controlling the direction of the trajectory of a wellbore, comprising a shaft (1) driven in rotation, a drill bit (11) secured to the shaft, a substantially cylindrical body (2) coaxial with the shaft and freely rotating in relation to the shaft pads (3) carried by the body that can move radially, and a pad displacement mechanism (96). The displacement mechanism individually comprises, for each pad, at least one thruster (7) whose longitudinal displacement in relation to the axis of the device causes an extension of the pad. Actuators (9) are driven by hydraulic energy supplied by drilling fluid circulating in the shaft and comprise a system (8) for selecting radical displacement of less than all of the pads.

Abstract: A system for displacing instruments in a pipe including a portion that is greatly inclined to the vertical. The system includes a set of instruments mechanically linked, by means of an extension, to a first end of electrically-powered displacement device. The extension is a section of a composite, semi-rigid rod that can be wound around a drum and comprises at least one electric conductor. The present invention also relates to a method for implementing the system. Application is to greatly inclined oil wells and to lateral holes.

Abstract: A laboratory device and method are adapted to subject a same rock sample to successive liquid treatments without any intermediary handling of the sample. The device combines a chamber comprising a first part fitted with an inlet for introducing a rock sample and liquid reagents into the chamber; a heater for regulating the temperature in the chamber and a plug fitted within an open port for protecting the chamber from an overpressure. The first part also comprises means for stirring the contents of the chamber including a liquid by introducing gas as bubbles into the liquid. A second part of the chamber is located under the first part and a selective filtering unit is interposed between the first and second parts of the chamber, the filter has a porosity selected for retaining organic material contained in the sample.