Schlumberger

Quicksilver Probe Focused Fluid Extraction

Quicker, Quantified, Cleaner Fluid Extraction

The Quicksilver Probe focused extraction technique sets new standards in speed and purity across a broad range of hydrocarbons, from condensate to heavy oil, even in oil-base mud.

The innovative technology used by Quicksilver Probe focused fluid extraction efficiently separates contaminated fluids from the formation fluid early in the fluid-extraction process. The result is cleaner, purer fluid with minimal contamination and obtained in much less time than compared with traditional probe-type wireline formation testers.

The novel probe design used by Quicksilver Probe focused extraction divides the fluid flow from the reservoir into two paths, with the central extraction area isolated from the surrounding “guard” area around the perimeter. The two probe areas are arranged concentrically, with each probe connected to an independent pump and separate flowline. The pumps run at different rates that exploit the filtrate/fluid viscosity contrast and permeability anisotropy of the reservoir. The higher intake velocity created at the surrounding guard probe directs contaminated fluid into a preferential flowpath toward the perimeter, while the pure formation fluid drawn into the central extraction probe and flowline is available for fluid profiling and sampling. Spectroscopic analyzers determine the composition of the fluid in each flowline, and the pump rates can be adjusted as necessary to achieve and maintain the extracted fluid purity.

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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