Abstract: The invention relates to a downhole rotary coring device placeable in a drill string and comprising a head section, a motor, and a core barrel having an outer motor comprising a rotor connected to the outer barrel and a stator to the head section, whereby the rotor and the stator are movable with respect to each other in the longitudinal direction of the drill string.

Abstract: The invention relates to a downhole rotary coring device placeable in a drill string and comprising a head section, a motor, and a core barrel having an outer motor comprising a rotor connected to the outer barrel and a stator to the head section, whereby the rotor and the stator are movable with respect to each other in the longitudinal direction of the drill string.

Abstract: A soil analysis and sampling system is provided with an outer tube (1) having near its outer end a part (3) with a decreased inside diameter and at its outer end a drilling head (1') having an opening in the centre; a series of extension tubes (2) which are connected to the top end of the outer tube (1); an upward seal (18) for the extension tubes (2); a pump system for introducing compressed fluid under the upward seal (18); and a tool provided with a hydraulic cylinder (8) cooperating with the outer tube (1), which cylinder (8) comprises a piston (9) moving in a linear motion when fluid pressure is exerted onto one side of the piston (9), and a rod (12), connected at one outer end with the piston (9) and at the other outer end with a sampling tube (13) or bottom hole analysis probe, whereby the downward movement of the piston pushes the tube (13) or probe below the drilling head (1') into the ground.