The Schlumberger UNIGAGE pressure gauge system provides high-quality, high-reliability pressure measurements during reservoir tests in exploration and development wells and during production tests on slicklines. The UNIGAGE system is built around either a high-resolution, high-stability quartz sensor (WCQR or WTQR) or a Schlumberger Sapphire pressure sensor (WTSR or SLSR). Both types of sensors provide high-quality data to ensure accurate interpretation of pressure measurements for optimum reservoir characterization.
The UNIGAGE system is designed for operations in harsh conditions such as H2S, CO2, acid, and TCP operations, and is compatible with highpressure, high-temperature jobs to 25,000 psi and 410 degF. Tests up to 1 year in duration can be performed.
A fast-recording rate recorder associated with a high-capacity memory allows the UNIGAGE system to fit with a broad range of test objectives and test durations. In addition, an intelligent memory management system, including memory guard, data reduction, and programmable windows, ensures full coverage of the well test even if more time is needed than was initially expected.
The WCQR sensor with quartz dual-mode oscillator and dynamic compensation provides outstanding metrological performance and is particularly well suited to high-permeability reservoirs with small pressure drawdowns.
The WTQR sensor equipped with a quartz sensor is an excellent choice in terms of accuracy, resolution, stability, reliability, and job duration requirements.
The UltraSapphire ultra high-pressure, high-temperature pressure gauge, WTSR, can be run by itself on monocable electric line for surface readout operations.
The SLSR is a cost-effective, efficient pressure gauge, particularly when run on slickline for downhole recording.
All UNIGAGE systems can be used in conjunction with the DataLatch system. This system has the benefit of a downhole valve to shut in the well, minimizing the ellbore storage effect and thereby shortening the test duration. The data are stored in memory but can be read at any time using a reliable inductive coupling method. An operational tool on an electric line allows full communication with the gauges, including data downloading, gauge reprogramming, and real-time surface readouts.
Benefits
- Provides high-quality data for optimum reservoir characterization
- Ensures reliable measurements in harsh environments and TCP operations
- Reduces test time
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