| 摘要 |
When conducting in situ measurements etc. of the properties/parameters of a reservoir fluid, possibly in connection with analyses,use is made of a measuring instrument/apparatus-containing casing (7) at the upstream end of a drill string (4), which casing has a combined inlet/outlet facing the hydrocarbon-containing layer (2) of the reservoir and is in fluid communication with the bore of the drill string (4), in which is disposed a reciprocally sliding piston (17), the top of which - opposite the side for inflow of reservoir fluid (RF) - may be acted on by pressure through a pressurisable fluid (water or N2) in order, on completion of the measurements, to force the reservoir fluid (RF) previously accommodated in the bore of the drill string back into the oil-containing layer of the reservoir. By so doing, a considerably capacity for accommodation of fluid is made available, represented by a drill string (4) upstream of a given point (the piston), with possibilities for return to source of an enormous volume of fluid. This is highly suited for subsea measuring apparatuses/instruments that - in order to give results with a very high degree of accuracy - require very large flow rates of test fluid. |
