Abstract: A power generator for use in a bore, the power generator comprising at least one drivable member; and at least one generation apparatus; the generation apparatus comprising at least one generator magnet for producing a magnetic field; and at least one electrically conductive member located or locatable within the magnetic field; wherein the drivable member is drivable by fluid flowing in the bore so as to produce relative motion of the at least one magnet and the at least one electrically conductive member in order to induce a current in the at least one electrically conductive member.

Abstract: Disclosed is a method and apparatus for collecting energy in a well. An energy collecting arrangement located in a well may be used to collect energy from variations in fluid pressure in the well. The energy may be used to control downhole apparatus, and/or may be stored for later use.

Abstract: A power generator for use in a bore, the power generator comprising at least one drivable member; and at least one generation apparatus; the generation apparatus comprising at least one generator magnet for producing a magnetic field; and at least one electrically conductive member located or locatable within the magnetic field; wherein the drivable member is drivable by fluid flowing in the bore so as to produce relative motion of the at least one magnet and the at least one electrically conductive member in order to induce a current in the at least one electrically conductive member.

Abstract: The invention is an optical fiber distributed temperature sensing system comprising an opto-electronic unit and a sensing optical fiber, which system measures temperature so as to provide a temperature profile along at least part of the length of the optical fiber. The system includes reference coils, which are temperature reference points, at a location that is remote from the opto-electronic unit and closer to the region whose temperature is being measured.