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They do have real time date, otherwise they wouldnt know where they were going or what they were drilling through! its just that there can be gaps in the data and recorded date is slightly more precise. The real time data is sent to surface using a pulser in the drill string that basically sends shock waves back up the mud and is decoded at surface. Very simple but also very clever stuff! Thats a massive over simplification too!
Thanks investacat. Been out most afternoon and missed all the fun it seems!. Your answer makes sense. I hadn't thought about waiting until TD to download all data and analyse. Also, seeing we are referring to 'matching prognosis' thought real time data analysis may be undertaken at this stage.
It was more a curiosity question as am not bothered if it adds a day or two in the grand scheme of things.
Not long now!
GL.
Aj1409 the ROP doesnt have any real bearing on the mwd tools, the only time they slow things down is when they take a survey at the bottom of each stand of pipe. But the company man will push them as hard as possible as safely as possibly without risking data loss (not that thats really a thing as its recorded on the tools anyway and downloaded after they pull out. ) because the sooner they are done the sooner the tools are not being used and not being charged for! So unless there is a formation problem or its just difficult drilling they will be full steam ahead until TD. They only really dont get to TD if there are tool or formation problems.
EnergyGeo... thanks for the posts
Thank you EnergyGeo for filling in more gaps in my knowledge.
Have a passing question on the final journey to the TD...
Seeing that they are likely to be running MWD/LWD, does that mean a slower drill rate?. ..or is it a stop/start at this critical stage?
Presumably data acquisition and processing in real time to make ongoing decisions including whether they need to go beyond TD?
TIA.
Thanks for your take on progress to date EnergyGeo, it's very much appreciated.
Direct link to Report From The Rig:
https://www.carnarvon.com.au/report-from-the-rig-with-george-mills/
Or it could be ' we have intersected the reservoir at x meters, and will continue to TD' ?
Next news should be TD and start ofwire logging then?
Thanks energy geo very interesting input, as usual.
https://www.carnarvon.com.au/report-from-the-rig-with-george-mills/
Posted yesterday on the Carnarvon website. It's of general interest and also has a couple of interesting points At the time of writing this they were running 9 5/8" casing. So casing run probably no later than Saturday. I would expect that they are now drilling ahead in 8 1/2" hole.
Also they are running MWD/LWD tools on the drillstring near the drillbit. The MWD (Measurement While Drilling) tools take mechanical measurements while drilling: such as downhole torque, rate of penetration, downhole weight-on-bit and downhole pump pressure and mud weight). The LWD tools (Logging While Drilling) contain at least a simple Gamma Ray and Resistivity tool (could be porosity tools as well but not necessarily). The MWD tools help to drill the hole efficiently while the LWD tools will be able to tell when they enter the reservoir and whether there is any oil there during drilling. These tools should also be able to detect the oil/water contact. Data from these tools can be transmitted to the surface while drilling and they almost certainly have an online monitoriing system where the Carnarvon staff in the Perth office can watch the data come in live,. These downhole tools do not replace wireline logging which will be run after reaching TD and are more accurate.
Thought this might be of interest.
I don't think this changes the expected progress and suggests that the reservoir is still a few days away.