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Install the top cap, the bull nose, and clock housing complete the tool installation. A bump when installing the clock housing may cause the valve release to be triggered and they will need to be re-opened. The clock will then also need to be re-set unless you have enough wiggle room in the timing. Now slide on two centralizers spaced out along the tool with a tightening ring shaft collars on both sides of each to lock them in place(fig. 10).
fig. 10
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
Extracting the Sample
1. Disassembly
Once the tool is brought in by the core techs remove the centralizers and rinse them with water. Then break the connections and remove so that both the the bottom and top springs and valve assemblies are exposed(Fig. 11).
fig. 11
2. Prepare for sampling
Attach the transfer head assemblies in the orientation of which you wish to take your sample from. Meaning one will have pressure attached to it to force out the water sample(fig. 12). While the other will have a sample manifold(fig. 13) that will drain into a sample container.
fig. 12 fig. 13
3. Open the sample chamber
The sample chamber is under the pressure equal to where the water was captured and most likely contains a gas headspace. Because of this pressure only the sampling end of the assembly will need to be opened at first and added pressure from the other end will not be needed until later. If the gas is wanted to be sampled make sure to have the tool slanted so that the gas will accumulate near the sampling assembly. First making sure all valves are closed on the sampling manifold begin to screw the black handle on the sampling assembly. Once you reach the set end of the screw the chamber is open. You most likely will not feel it open, do not try to turn past this point. Now by carefully opening the sampling manifold begin collecting gas/water.
4. Adding pressure to complete sampling
Once the water is no longer freely flowing out of the sample chamber it is time to open the pressurized transfer head assembly and force the water out. In the past an 'empty' nitrogen bottle was used at 20psi for this purpose as to not contaminate the sample with oxygen. As the sample chamber get close to empty lift the pressurized end up to ensure the most water come out before the nitrogen begins to come out. Once this happens the sampling is complete and hopefully there was close to 600mL of water obtained.