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Supercharge, Invasion, and Mudcake Growth in Downhole Applications


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fluids, and to predict reservoir behavior during production.

      THE EFDT is a modular formation testing system. It can be customized for the specialized applications. The modularity of EFDT ensures its ability to test and sample fluids in a wide range of geological environments and borehole conditions. For its basic configuration, the string includes a fully controllable Dual Probe Module for fluid in-taking, a Flow Pump Module for variable-volume drawdown and pump out of contaminated fluids, a Fluid Sensor Module for dynamic properties of fluids, a PVT Carrier Module for monophase sampling, and a Large Sample Carrier Module for large-volume normal sampling. It can also be configured with a Straddle Packer Module, an Optical Analysis Module, a Focused Probe Module and a Multi-PVT Tank Module to meet the requirements of complex reservoir formation tests, such as low permeability rock or natural fractures.

       Applications

       Formation pressure measurements and fluid contact identification

       Repeatable formation fluid sampling

       Measurement of formation permeability and anisotropy

       Vertical interference testing

       ln-situ downhole fluid analysis

       Benefits

       Fast, high-accuracy pressure measurement using Quartz Pressure Gauges (QPG) with temperature compensation

       Conductivity/capacitivity, density, fluid dynamic pressure, NIR optical analysis and formation permeability anisotropy for real-time reservoir evaluation

       Savings of 50% sampling time using focus probe

       Multiple samples in one run, providing high quality PVT samples

       Features

       Modularity, offering expanded testing versatility

       Accurate pressure measurement using QPG

       Real time downhole fluid assessment

       PVT quality formation fluid samples

Graphs depict the pressure measurement chart (left) and real-time fluid monitoring chart (right).

       Functions

       Measuring formation pressure accurately

       Taking multi-samples of formation fluids

       Taking large samples

       Pumping through contaminated formation fluids

       Monitoring formation fluid properties in real time.

       Flowing formation fluids at controlled rates

       Pumping through in reverse

       Making quick well site sampler transfer

       Providing real time and reliable data for analyzing permeability and formation damage

       Structure

Schematic illustration of tool architecture. Schematic illustration of Pressure drawdown curve (left) and fluid contact curve (right).

      Figure 1.17. Pressure drawdown curve (left) and fluid contact curve (right).

      1.2.3 Enhancing and enabling technologies.

      While