MWD/LWD Services

The MWD tool is the instrument that tells the directional driller where the bit is and where it is heading. Survey and tool-face data come up the mud column as pressure pulses, so the trajectory can be corrected while drilling instead of after a trip.

The pulser is the valve that writes downhole data into the mud column. Lost-circulation material, high solids, heat and pressure are what break pulsers; a valve that keeps clearing itself is what keeps the surveys coming.

Annular pressure while drilling turns equivalent circulating density from a calculation into a measurement. It shows whether the hole is being cleaned, flags kicks and influxes early, and lets the overbalance be held tight without giving up rate of penetration.

Propagation resistivity reads the formation around the bit in real time, so a lateral can be steered to stay in the target zone and casing points can be picked without waiting on a wireline run.

Every survey depends on the surface receiver separating a small pressure pulse from pump noise. Deeper wells and PDC bits distort the signal; the lower the pulse a decoder can resolve, the more of the well it can survey reliably.

The logging system is where surveys, gamma and drilling parameters become the well record: plots, LAS files and reports the operator keeps, and a live feed the office can watch without being on location.