In this case study, we are looking at a horizontal well that was drilled by two of the previous owners of our Geo-Predict technology. This well was drilled to a vertical depth of 6800ft, the angle was built and the horizontal well was then drilled for 4500ft through the Austin Chalk formation which lies immediately below the Eagle Ford formation. The well was drilled underbalanced using foam and therefore any high flow gas pockets experienced while drilling should be immediately observed on the drilling rig at the flare stack. As further evidence of these high production zones which are believed to be located in micro-fracture swarms, the drilling team hoped to observe ROP increases as the drill bit passed through certain zones. The map displayed below shows the horizontal well and the predicted “sweet spot” map created from 3D data volumes after the data had been conditioned and interpreted using the Geo-Predict methodology. The bright red, yellow and green blotches were the areas where the Geo-Predict technique predicted the “sweet spots” to be within the data volume.
These predictions were then confirmed with remarkable accuracy as the well was drilled. As the drill bit passed through the predicted sweet spots, the drilling team was able to observe both a flare response on the drilling rig and a noticeable increase in ROP.
The technique for predicting these types of “sweet spot” involves many variables which must be overlaid with each other to infer the location of these “sweet spots” and this is where our intellectual property lies after conducting over 350 of these types of predictions in shale plays all across the USA and more recently in the Vaca Muerta shale play in Argentina.
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