Abstract: A system for use with a subterranean well can include a fluid oscillator which discharges pulsating fluid from a tubular string in a direction at least partially toward an end of the tubular string proximate a surface of the earth. A method can include discharging a fluid from the tubular string, thereby applying a reaction force to the tubular string, which reaction force biases the tubular string at least partially into the well. Another method can include discharging a pulsating fluid from a fluid oscillator in a direction at least partially toward an end of the tubular string, and drilling into an earth formation with a drill bit connected at an opposite end of the tubular string in the well.

Abstract: Equipment for the construction of piles includes a drilling rod and a tool (10) mounted at a lower end thereof. The tool includes a hollow central shaft (11) with a door (18) for the concrete; a screw (12) integral with the shaft (11); a compactor (13) positioned along the screw (12); a base (14) of semicircular shape provided at the lower end of the screw (12); a plate (15) superimposed under the base (14) and rotating around the shaft (11) for alternatively assuming an open position, in condition of excavation wherein it superimposes on the base, and a reclosed position, in condition of compaction wherein it forms a surface circular with the base (14). Excavation teeth (16) are fixed to the lower end of the tool and an additional tooth (19) is constrained to the plate (15) that during the casting is outside of the tool in the condition of compaction.

Abstract: Apparatus and a method for adding and removing tubulars whilst containing the pressure within a drill string and/or maintaining circulation of drilling fluid down a drill string using a diverter sub which is able to open up to mud flow from a side mud port and close off the flow of mud from above the drill string with or without continuous rotation of the drill string.

Abstract: Described herein is a bit (9) for excavation and compaction equipment (1) for erecting piles, the bit (9) being provided with a central body (21), an excavation screw (24) fixed to the central body (21), and a dislocating element (40) for compaction of the walls of the excavation, a retention device (25) that can be selectively re-closed being associated to the central body (21) for preventing fall of debris beyond a leading edge (27) of the screw (24) during extraction of the bit (9), and the dislocating element (40) being mounted on a fixed portion (28) of the retention device (25), and presenting a radial development, which decreases with respect to a rotation of excavation of the excavation screw (24) for compaction of the walls (3a) of the excavation (3) during extraction of the bit (9).

Abstract: A zone isolating and testing apparatus comprising an isolation tool and a downhole flow control means and a method of using such apparatus. The zone isolating and testing apparatus is particularly useful for testing zones during reverse circulation drilling using concentric drill string such as concentric drill pipe or concentric coiled tubing. The isolation tool of the zone isolating and testing apparatus comprises an expandable packer means and is adapted to connect to concentric drill string near the drilling means and be in fluid communication with the concentric drill string. The downhole flow control means of the zone isolating and testing apparatus comprises at least two valves, one for closing off the annular conduit between the inner tube and outer tube of the concentric drill string and the other for closing off the inner conduit of the inner tube.

Abstract: An actuatable safety valve for the production tubing of wells and/or fluid flowlines includes a valve element having both linear and rotary components of movement within a valve body and is actuated by a lost-motion rack and pinion gear actuating mechanism. The clam-shell pinion gear is moved linearly within the valve body by a hydraulic sleeve piston actuator for causing control valve movement responsive to hydraulic control of the sleeve piston. The sleeve piston is also responsive to upstream pressure for pressure actuation of the valve to its closed position. The valve element is also mechanically movable to its closed position.