Saturday, 20 September 2014

Information From MWD Drilling Software

By Karina Frost


MWD which in full is Measurement While Drilling is measurement taken when drilling on an angle of inclination to the vertical line. These measurements are taken by the MWD Drilling Software. This data is used to produce a 3-D plot of the path of the oil well. This software will transmit crucial information to the operator during operations.

The software transmits information on the direction the well is being drilled. Directional survey can be done by the software and sent in real time. Azimuth and the inclination angle of the drill hole are measured by the magnetometers and accelerometers in it. Immediately information on them has been measured it is transmitted to the surface for analysis

Analysis of data is done on the surface before calculation of the location of the wellbore after data transmission which takes data from 10m to 500m in intervals. This information is as crucial as it being prove enough that the company is not doing any operation outside its permitted site or circumference. It may not be used when creating vertical holes or near vertical direction because it is quite expensive.

The surveys is mainly used in directional-drilling. Directional-drilling forms the main or core part of any survey. Finding and moving towards the target zone of the well will be made easier by this information. Directional-drilling is aided by MWD by the provision of tool face measurements which uses downhole mud motors with bent housing or bent.

The software sends information about the mechanics of the drill bit. This kind of information include the downhole temperature, mud flow volume, smoothness of rotation, the drillstring speed of rotation, the weight as well as torque on the dril bit. This info will lead to more efficient operations. It also ensures that the tools used won't fail when drilling because they can be operated within their technical specifications. Geologists use this information to understand the formation of the zone being drilled.

Drillers use information from the MWD tools for performing geosteering to the zones targeted. The software sends formation properties of the area being drilled at that moment. This kind of information will be on porosity, inclination of the drill bit, the resistivity and the acoustic-caliper which is very important to the driller.

There is also the measurement of natural gamma rays measurements at the well using internal gamma ray sensor installed in MWD tools. The sensors cost a lot, are compact and able to take measurements when drilling unmodified drill collars. Compacts and cheap sensors will do unmodified drill collars during operations. MWD software cuts the various process costs and increases the lifespan of the drill bits.

Mud-pulse telemetry method or electromagnetic telemetry are the two methods used to transmit data from the drill bit. The mud valve downhole gives the information in the mud-pulse method, by creating pressure differences when restricting mud flows. The pulse can either be continuous wave, positive or negative pulse.

Electromagnetic telemetry method of data transmission by the MWD software involves generation of altered voltage different in the upper part and the lower portion of the electrical insulator used in the drillstring. A wire attached to the wellhead on the surface and another wire attached to the rod form the electrodes of a dipole antenna. From these electrodes the voltage signals are obtained and analyzed to give information.




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