Abstract: In a jarring device and method for applying an impact to a casing of a wellbore in a subterranean or subsea formation, the jarring device includes a hammer and a driving means for driving the hammer between a first position in which the hammer is spaced from the casing, and a second position in which the hammer contacts the casing, such that the driving means is operable during use to drive the hammer from the first position to the second position so as to impact the casing. The hammer is reciprocated by the driving means.

Abstract: A jarring device 100 and method for applying an impact to a casing 10 of a wellbore in a subterranean or subsea formation. The jarring device 100 comprises: a hammer 120 and a driving means 110 for driving the hammer 120 between a first position in which the hammer is spaced from the casing 10 and a second position in which the hammer 120 contacts the casing 10, such that the driving means 110 is operable during use to drive the hammer 120 from the first position to the second position so as to impact the casing 10; wherein the hammer 120 is reciprocated by the driving means 110.

Abstract: A pipe section for coupling to one or more pipe sections in order to form an elongate tubular. The pipe section has an optical fiber extending along a longitudinal axis of the pipe section and a waveguide disposed near one end of the pipe section and is in optical communication with the optical fiber to guide light in a plane substantially perpendicular to the longitudinal axis.

Abstract: A pipe section for coupling to one or more further pipe sections in order to form an elongate tubular, the pipe section comprising and optical fibre extending along the longitudinal direction of the pipe section, a waveguide disposed near one end of the pipe section and being in optical communication with the optical fibre, the waveguide being configured to guide light in a plane substantially perpendicular to the longitudinal axis of the pipe section.