Abstract: A system comprises a tool arrangement; a line including an optical fibre for distributed optical sensing measurements, and an electrically conductive member covered by an electrically insulating material, the line having the outer profile of a slickline; and a termination-coupler which mechanically connects the line to the tool arrangement, electrically connects the electrically conductive member of the line to the tool arrangement, and optically terminates the optical fibre of the line. A method comprises using the optical fibre to perform distributed optical sensing measurements; identifying one or more regions of interest of the elongated space based at least in part on results of the distributed optical sensing measurements; hauling in and/or paying out the line to cause the tool arrangement to move to each region of interest; and electrically transmitting information along the electrically conductive member to cause the tool arrangement to measure the one or more values.

Abstract: A method for performing operations in a well comprises sensing a condition at, adjacent, or within a wellhead arrangement located at an opening of the well and performing a safety procedure in response to the sensed condition to improve the safety of the well operations. The method may comprise sensing the condition when a tool is located at, adjacent to, or within the wellhead arrangement. The sensed condition may be associated with a status of the tool. The sensed condition may be associated with an emission, field or signal transmitted to and/or from the tool, extending to and/or from the tool, and/or coupled to and/or from the tool. Performing the safety procedure may comprise controlling a position or status of the tool or controlling an environment at, adjacent to, or within the wellhead arrangement.

Abstract: A wireline apparatus comprises a sheave for accommodating a wireline and a sheave mounting configured for coupling to a wireline stuffing box. The apparatus includes a sensor for measuring at least one of wireline tension and deployed wireline length at the sheave.