WellWatcher Neon DTS, DAS & PT Gauge System | Schlumberger

WellWatcher Neon

DTS, DAS and PT gauge system

Identify flow anomalies and leaks and manage zonal flow without intervention

Improve reservoir understanding and help increase productivity with the WellWatcher Neon DTS, DAS, and PT gauge system, which combines a fiber-optic line and an electrical conductor in a single permanent downhole cable.

With the option of up to three fibers per cable, you can use one for DTS, a second for distributed acoustic sensing (DAS), and a third for deployment of an optical pressure gauge. The electrical conductor transmits data from downhole electrical PT gauges.

The DTS data is typically used for allocation of injection or production and for optimization and diagnostics of the upper completion. The DAS data is used for vertical seismic profiles (VSPs) as well as leak detection and flow properties analysis. More than 130 systems are deployed worldwide, making WellWatcher Neon systems the industry leader.

WellWatcher Neon DTS, DAS, and PT gauge system

Distributed permanent measurement acquisition hardware and software

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  • Surface hardware
  • Downhole hardware
  • Acquisition software
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Schlumberger Worker Reviewing Distributed Measurement Systems Data

Diagnose rapidly, without interrupting production

Temperature measurements at about 0.5-m intervals along the length of the cable produce a profile of temperature effects along the production string and, when applicable, across the mudline. The cable can be interrogated continuously or intermittently to provide rapid wellsite diagnostics without interfering with production. At the surface, well profiles can be stored on site and viewed locally or securely transmitted via cable or wireless technologies.

Improve well and reservoir management

THERMA thermal modeling and analysis DTS software defines flow rate from individual zones by analyzing distributed temperature data in the wellbore and near-wellbore area, taking reservoir, fluid, well, and completion properties into account.

Ensure accuracy even at high temperatures

The proprietary optical fibers are qualified at high temperatures and high levels of hydrogen concentration, proving their ability to combat the hydrogen degradation suffered by conventional fibers. The WellWatcher Neon system is rated 20,000 psi [138 MPa] and 365 degF [185 degC].

The reliability of the downhole connectivity equipment is ensured by the field-proven Intellitite downhole dual-seal dry-mate connector

Operating temperature range: –4 to 365 degF [–20 to 185 degC]
Max. working pressure: 20,000 psi [137.9 MPa]
Max. installation length: 32,800 ft [10,000 m]

Interpret WellWatcher Neon System Data

Identify leaks through orifices such as a port, nozzle, or choke.

Find a leak using DTS and derived flow data

Leaks can cause the fluid passing through to expand suddenly. This fluid expansion changes the fluid’s temperature—a principle known as the Joule-Thomson effect—and signals the location of the leak.

Case study: Real-time data identified leaky valve

In a well drilled to explore the deep layers of a reservoir, the WellWatcher Neon system indicated a temperature drop of 1.5 degC at the fourth gas lift valve in the longer of two tubing strings. This temperature drop identified both the tubular with the leak and the source of the leak—an improperly seated valve.

The operator was able to resolve the problem within a few hours instead of the extended time that the traditional repetitive method of searching for the leak through trial and error would have involved.

wellwatcher neon case study chart
Pressure transient analysis (PTA)
Early water breakthrough requires you to balance choke adjustments with the stimulation treatment. WellWatcher Quartz premium high-temperature, high-resolution PT gauges can be placed in a well to provide PTA workflows. These workflows reveal changes in skin and can be used to determine the productivity index (PI) of the well. Understanding the changes in PI enables you to take the necessary steps to optimize production over the life of the well.
Inflow profiling
In fields with stacked reservoirs, where pressure, permeability, and oil and gas characteristics vary greatly between layers, WellWatcher BriteBlue multimode DTS fiber can be run to provide inflow profiling of individual zones. Downhole flow control valves can then be used to manage individual zones independently, without costly intervention.
ESP management
Downhole pressure and temperature measurements obtained with WellWatcher Sapphire PT gauges can be combined with ESP surface parameters, such as variable speed drive frequency, to prevent deadheading, which often requires a costly workover and ESP replacement. The data can also be used to troubleshoot other common ESP scenarios that reduce well productivity, such as scale deposition above the pump and loss of pump submergence.
Unconventional well stimulation
Using WellWatcher Extend high-resolution dual-sensor PT gauges in unconventional oil and gas wells to monitor bottomhole pressure helps in identifying significant changes to skin, degradation of fracture size and conductivity, and stress-related permeability behaviors. Proactively analyzing the data enables you to monitor drawdown during production and the health of the fractures, both of which are important for long-term well performance.
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