| 摘要 |
<p>A well fluid sampling tool and method for retrieving chemically accurate hydrocarbon samples from new wells. The sampling tool is provided with a chemically inert sample chamber and lowered to the required depth in the well where a well fluid sample is admitted to the sample chamber, which is subsequently sealed. The tool is preferably arranged so that pressures inside and outside the sample chamber remain substantially equal during and after sample taking. The sample may be subject to post-sampling pressurisation to keep the sample in its original single-phase state. The chemical inertness of the sample chamber avoids removal of reactive components of the well fluid from the sample by chemical reaction with the material of the sample chamber (which is conventionally metal). This enables accurate assessment of new wells without the need for extended flow testing. Equalisation of pressures inside and outside the sample chamber enables the material of the sample chamber to be selected for its chemical inertness rather than for mechanical strength to resist forces otherwise arising from pressure imbalances.</p> |
