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All connections should be firmly hand tightened. The tool is now ready to be connected to the core line and sent down hole.

Downhole Operation

    1. Discuss with Ops and Core Techs

Make a plan as to what hardware will be run with the tool(whether it is out of a APC/XCB, RCB, or logging bit). Make sure the core techs have all hardware needed to assemble the tool into its protective pieces and attach it to the drill string. The drill pipe will be positioned with the bit ~10 meters above the target sample depth. The tool is normally run down at ~70m/min(this can be decided with the Ops Manager). Once the tool is landed in the BHA the drill string(tool) and pipe will be lowered together the final 10 meters with the mud pumps switched off 15 minutes prior to when the sample chamber should close. This will allow the sample to be collected at the final lowered depth as the entire water column is displaced. Wait until 5-10 minutes after tool should be closed to ensure sample is secured before bringing it up.

    2. Come up with a sample target depth

This involves the staff scientist and scientists who are requesting the sample to come up with a target depth at which the sample is to be taken. Once this depth is given the correct timing calculations can be made.

    3. Calculate Timing Needed

This is one of the most important steps of the operation procedure. In order to collect a good sample at the correct depth without wasting operational time the tool must close at the right moment. Add up the following estimates to come up with the correct clock setting. Note that these are rough estimates and operation procedure may change depending on hole conditions and sample requests.

• ~10 min from timer set to handing off to rig floor.
• ~10 min to attach to drill string.
• Time to be lowered(min) = (Target Depth-10)(m)/Lowering Speed(m/min)
• ~15 min so that pumps can be shut down and pipe and drill string can be lowered together the last 10m to capture sample at target depth.

    4. Make sure everybody is ready and begin

Once the plan is set and the time has been calculated set the timer and begin procedure. You are on the clock! Be ready for sample collection when the tool is on deck. 

Extracting the Sample

    1. Disassembly

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