Schlumberger

Characterize Deepwater Reservoir Fluids

Sampling and fluid analysis technology developments

Timely and accurate analysis of reservoir fluids is essential to assessing and planning further operations. Smart downhole analysis techniques now monitor the purity of fluids and ensure samples are representative before they are captured and returned to surface. In situ hydrocarbon characterization can be performed in a single pass. Some sampling operations that typically took days previously can now be completed in a matter of minutes.

Wireline-conveyed measurement

Time is critical in all deepwater operations. In a single trip, pressure, temperature, and other properties are measured in real time to efficiently conduct downhole fluid analysis, allowing for timely decisions.

Continuous fluid identification and characterization

From a single pass with multiple depths of investigation, advanced magnetic resonance logging provides near-wellbore formation evaluation, fluid identification, and in situ hydrocarbon characterization. This information helps in planning the fluid sampling program.

Formation testing, fluids sampling and analysis

Various technologies are available to measure formation pressure and fluid mobility. Programs can be designed to generate a survey of reservoir pressure for connectivity analysis, a pressure gradient for fluid density and fluid contact information. Fluid mobility data aid in sample-point selection to collect high-quality formation fluid samples for real-time downhole fluid analysis at reservoir conditions. These data, when integrated with petrophysical, seismic, and conventional log data, provide a complete reservoir picture.

These data, when integrated with petrophysical, seismic, and conventional log data, provide a complete reservoir picture.

Drillpipe-conveyed measurement

Formation pressure while drilling

The pressure profiles obtained while drilling help us to understand fluid movement. In virgin reservoirs, pressure profiles can be combined with other logging-while-drilling (LWD) services to develop a static reservoir model. Dynamic reservoir models, based on these pressure profiles, can be used to optimize recovery and enhance the understanding of a field's production systems, leading to improved completions.

Drillstem testing

Accurate downhole measurements of reservoir pressure, permeability, skin, or productivity increase the confidence in reservoir characterization. Flexibility in downhole tool design provides reservoir information from multiple zones on the same test, saving rig time and allowing fast updating of the reservoir model.

High-performance technologies combined in one string

High-performance downhole reservoir testing systems combine a number of downhole testing technologies in one string. This streamlined approach to reservoir testing has the potential to save the operator time and cost by providing accurate, deep-reading, high-resolution pressure measurements and contaminant-free reservoir-representative fluid samples in a single logging run.

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Real-Time Downhole Fluid Analysis

InSitu Density
InSitu downhole quantitative fluid properties measurements of density, composition, gas/oil ratio and condensate/gas ratio, CO2, color, fluorescence, and pH are made at reservoir conditions. Visit Wireline Services for Reservoir Engineering page

Predict Pore Pressure Trends to Control Drilling Hazards

StethoScope formation pressure-while-drilling service
The StethoScope formation pressure-while-drilling service provides real-time calibration points for pore pressure models during drilling. Visit StethoScope Service page

Determine Purity with Flowline Monitoring of Fluid Type and Gas Fraction

Near-infrared optical absorption spectrometry and fluorescence emission measurements are used to determine gas-fraction concentrations and to identify fluid types, respectively, as fluids flow through the CFA module.
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