Abstract: An apparatus for injection of coiled tubing or jointed tubulars into a well bore, using an injector head capable of handling either type of tubular. The injector head and a working platform are mounted on a structure over the well head, with the injector being positioned so as to allow personnel access to the tubing on the working platform without having to relocate the injector head away from the well head location. The injector can be mounted below the working platform, or it can be mounted spaced above the working platform on a vertically movable trolley on a mast. When the injector is mounted below the working platform, the tubulars and any bottom hole assembly are accessible to personnel on top of the working platform, whether coiled tubing or jointed tubulars are being used.

Abstract: A multi-detector intensity interferometer includes plural radiation detectors positioned in a predetermined geometric array. Incoherent radiation signals from a body are received by the respective detectors, time-delayed relative to one another, and the time-delayed signals are fed to a multiplier circuit. The multiplier circuit produces an output signal comprising the product of the time-delayed signals from each of the detectors. This output signal is then integrated by an integrator circuit. A significant output signal is produced by the integrator circuit only when the time-delays of the respective detected signals correspond to the location of the object relative to a reference location. In a preferred embodiment employing at least four such detectors, the three-dimensional coordinates of the body relative to a reference coordinate system can be determined from the time-delays.