Schlumberger

Quicksilver Probe Focused Fluid Extraction

Extract virtually contamination-free fluid for downhole fluid analysis and sampling

Quicksilver Probe focused fluid extraction collects virtually contamination-free formation fluids in a fraction of the time it takes to collect conventional samples. The quicker collection of more-representative samples for real-time downhole fluid analysis (DFA) gives you a better understanding of hydrocarbon properties at reservoir conditions while avoiding extended production testing or lengthy additional PVT laboratory work.

Focused sampling: purity and speed

The innovative concentric probe design employed by Quicksilver Probe focused fluid extraction draws filtrate-contaminated fluid to the perimeter of the probe, where it is pumped into a separate flowline. This diversion enables the probe center to collect pure reservoir fluid into a sampling flowline. The fluid properties in both flowlines are monitored in real time to control the independent pumping systems during the focused sampling operation.

Focused fluid extraction not only sets a new standard in sample purity, but the faster fluid cleanup significantly reduces station times to cut rig time and cost.

Fluid profiling: in real time and quantified

Quicksilver Probe focused fluid extraction makes it possible to conduct real-time DFA for fluids ranging from condensate through heavy oil, even in oil-base mud. The more you know about your reservoir fluids, the better equipped you are to reduce the risks associated with producing them. The focused extraction of virtually contamination-free reservoir fluid from the formation is key to InSitu Family downhole quantitative fluid properties measurements, delivering answers at true reservoir conditions, all in real time.

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Downhole Fluid Analysis Saves USD 24 Million in the North Sea

The quality of the water samples obtained in BG’s North Sea well was assessed by real-time LFA analysis. The middle track shows the volume fraction of hexane and heavier (C6+) hydrocarbon components, indicating oil-base mud filtrate contamination (green), oil-base mud and solids (red), and water (blue). At 2,600 s, soon after the guard and fluid-acquisition pumps start to pump synchronously, the acquisition flowline receives formation water, shown as blue on the volume-fraction track once high amplitudes are reached when water is detected on LFA optical Channels 6 and 9 (dark blue) on the bottom track. Channel 0 (black) detects methane. The top track shows the quartz-gauge pressure and strain-gauge pressure along with unscaled resistivity (pink) and pump strokes (blue and green).
Real-time optical analysis of fluids acquired by Quicksilver Probe focused fluid extraction from an exploratory well that accessed multiple hydrocarbon-bearing zones at HPHT conditions ensured that the water samples collected had virtually zero contamination, which avoided having to conduct a drillstem test. Read case study

Concentric Probes Quickly Divert Contaminated Fluid

The left schematic shows a conventional sampling probe and a typical contamination-time plot. In the right schematic, filtrate-contaminated reservoir fluid is contained by the annular perimeter probe of the Quicksilver Probe tool, while the center probe samples nearly contamination-free reservoir fluid in a fraction of the time.
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