Drilling & Testing 10125 Aug 2023 02:59
Part 1.
Since there appear to be a few investors here who may be relatively new to oil & gas exploration, it may be helpful to post a brief summary in simple terms of what happens while drilling & testing a borehole. Many of you know all about this, so you can safely skip to the next post, but I note there have been a few questions over the last few days.
The bore starts off with a wide diameter, and drills down in stages, each stage with a smaller diameter. Immediately following the drill bit is a string of instruments that record a number of parameters which would indicate reservoir potential and presence of gas. These measurements are recorded in an on-site truck. The presence of gas at various depths is also recorded, additionally by what bubbles up the drill hole, where it is captured at the surface - but these gas shows are not 100% representative of what may be in the reservoir, since they have interacted with the drilling fluid (drilling mud) on the way up. Rock chips brought up to surface are also recorded, for rock type, porosity and permeability among other characteristics.
All the above measurements & observations are collated into a striplog, which is used to identify the most likely depths at which to find economic helium deposits. This initial data will be released, enabling (hopefully!) a 'discovery' to be announced. I recommend taking a look at a real striplog to see just how complex & comprehensive the record is - these are almost never made available publicly, but I just happen to have one here:
https://wp-predatoroilandgas-2020.s3.eu-west-2.amazonaws.com/media/2023/01/StripLog-MOU-2b.pdf
It is a very big file and will take a while to load, you probably won't see very much worthwhile using a phone.
Each time drilling diameter needs to be changed, the whole drill string is withdrawn, and tubing called casing is lowered into the hole and cemented in position. This is to prevent the borehole collapsing. Unstable rock strata in the Lake Beds Formation in Tai-1 was a big problem, resulting in the drill string getting jammed, and a borehole diversion having to be made. This is extremely costly in terms of lost equipment and increased drilling time, but I am sure that lessons have been learned from last time. Other problems at Tai-1 included the correct equipment either not being available, or being incorrectly calibrated for methane detection & measurement, not for helium.