RE: Stena Drilling: a potential game changer? (Updated 23/8/20)23 Aug 2020 11:53
Tiburn, not sure I understand your last paragraph but it is likely that MWD and LWD will form the logging operations especially if/when the horizontal section of the well commences with instruments forming part of the BHA(bottom hole assembly) there is not much change out of US$1.5 million for this set up.
Curtsey of Wikipedia this is a overview of MWD and LWD. hope it does not bore you.
In the 1970s, a new approach to wireline logging was introduced in the form of logging while drilling (LWD). This technique provides similar well information to conventional wireline logging but instead of sensors being lowered into the well at the end of wireline cable, the sensors are integrated into the drill string and the measurements are made in real-time, whilst the well is being drilled. This allows drilling engineers and geologists to quickly obtain information such as porosity, resistivity, hole direction and weight-on-bit and they can use this information to make immediate decisions about the future of the well and the direction of drilling.[25]
In LWD, measured data is transmitted to the surface in real time via pressure pulses in the well's mud fluid column. This mud telemetry method provides a bandwidth of less than 10 bits per second, although, as drilling through rock is a fairly slow process, data compression techniques mean that this is an ample bandwidth for real-time delivery of information. A higher sample rate of data is recorded into memory and retrieved when the drillstring is withdrawn at bit changes. High-definition downhole and subsurface information is available through networked or wired drillpipe that deliver memory quality data in real time.[26]