19 AUGUST 2023 WorldWide Drilling Resource® Geomagnetic Model Aids Drilling Adapted from Information by National Centers for Environmental Information (NCEI) The unpredictability of earth’s magnetism can cause difficulties for any sector involving directional drilling. Because drilling hardware is often situated deep underground where magnetic field variations are stronger at small spatial scales, wells may be bored off the intended mark. Hence, accurate knowledge of the local magnetic field is important for estimating the wellbore path. Directional drilling operations cannot make use of the Global Positioning System (GPS) since GPS signals do not penetrate the ground. Instead, earth's natural magnetic and gravity fields are used to find the orientation of the drill bit. NCEI’s High Definition Geomagnetic Model (HDGM) serves as a solution to the issues geomagnetic variations can cause. It is an authoritative source for those seeking to drill safely, accurately, and cost-efficiently. Well planners utilize the program to compute magnetic reference values, and are also able to integrate the model directly into their directional drilling software. The HDGM allows for precise positioning so wells can be bored near each other in resource-rich areas with less risk of intersecting. The purpose of the HDGM is to serve as a model of the earth’s geomagnetic field. More than 90% of earth’s magnetism is produced by the shifting of electrically charged molten metals within its outer core. Other factors include currents in the ionosphere (part of the earth’s atmosphere which reflects radio waves), magnetic metals in and on the planet’s surface, and space weather events. Due to the transitory nature of these forces, the geomagnetic field is in a state of constant flux and is regularly strengthening and weakening. On November 15, 2022, NCEI’s HDGM received its latest annual update. Along with software adjustments and routine corrections made to accurately represent earth’s magnetic field, nine years worth of data collected from the Swarm satellite mission were incorporated. (Swarm is a constellation of three satellites in near-polar orbits launched by the European Space Agency to obtain better and more varied measurements of earth’s magnetic field and its temporal evolution.) With this overhaul, the HDGM will be accurate until December 31, 2023. Annual updates set the HDGM apart from other magnetic models, which may only provide averages based on data collected over a five-year period. The HDGM also provides calculations regarding more immediate changes to the geomagnetic field, smallscale variations of magnetism in the earth’s crust collected from satellites and marine surveys, and an annually averaged disturbance field. Crustal data drawn from magnetic trackline and grid data is archived by NCEI, which serves as the world’s largest repository of such information. Developed through a collaboration between National Oceanic and Atmospheric Administration and the University of Colorado, the HDGM-Real Time (RT) is also unique among other magnetic models in its ability to provide a live forecast of the earth’s magnetosphere. This is accomplished by the incorporation of data collected from a series of solar wind-observing satellites and land-based monitoring stations, as well as cutting-edge machine learning algorithms predicting likely changes in the geomagnetic field. In addition, the HDGM-RT is able to track daily changes in the ionosphere at mid and low latitudes. At the cost of the necessity of an Internet connection, the HDGM-RT allows for more efficient drilling during adverse space weather conditions by enabling live course correction. DIR
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