Measurement While Drilling is abbreviated as MWD. It is used to take the measurement of the inclination angle against the vertical line through the process. MWD drilling software then takes up all these values.The oil well paths are plotted in 3-D using this information. Communication between the operator and the floor is crucial and is provided by this software.

One of the information transmitted by the software is on the direction of the well. They are able to directional surveys and transmitting them in real time. The magnetometers and accelerometers in it are utilized to measure the azimuth and also the angle at which the hole drilled incline at that location. This data is then transmitted immediately to the surface.

The data transmitted at intervals of 10m to 500m is then analyzed on the surface to calculate the location of the wellbore. It is necessary information for the company since it acts as a proof that it is not operating outside the block it is licensed to prospect. When operating vertically or near vertical direction this technology is not used due to its high cost.

The core use of the surveys is in directional-drilling. The well may be located at a certain zone and this information helps the driller in steering the process towards that target zone. MWD provides toolface measurements using downhole mud motors with bent housing or bent subs to aid in directional operations.

There is the smoothness of rotation, mud flow volume, downhole temperature, the drillstring speed of rotation, and the weight and torque on the bit, this information is sent to the mechanics of the drill bit which leads to more efficient operations. The tools are also used in accordance with their specifications thus cannot break down. Understanding the rock formation of the area is crucial to geologists.

MWD tools are capable of measuring the formation properties and send the data to drillers when drilling is ongoing. They use this information to perform geosteering to the target zone. The information varies from porosity, inclination at the bit, acoustic-caliper, density, and resistivity.

The internal gamma ray sensor using installed in MWD tools measures the natural gamma rays values at the well. The sensors are inexpensive, compact and are able to take the measurements when working on unmodified drill collars. MWD computer programs cuts the process costs and increases the life-span of the drill bits.

The data they get during the operations is either transmitted by the mud-pulse telemetry method and electromagnetic telemetry. In the mud-pulse telemetry method the mud valve downhole which restricts the flow of slurry creates pressure differences which are send to the surface as for analysis. It can either be positive, negative pulse/continuous wave.

In electromagnetic telemetry method by the MWD software, altered voltage is generated in the upper and lower part of the electrical insulator then incorporated in the drillstring. There is a wire from both thewellhead on the surface and the rod which form the electrodes of a dipole antenna. These electrodes provide information from analysis of the voltage signals.

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