Stand Alone Gas Monitoring

The GWA detect and analyze C1 through C5 hydrocarbon gases in one-second intervals.

Gas Watch Analyzer

The Gas Watch™ Analyzer is the oil and gas industry’s most innovative, versatile, and easy-to-use gas detection system.

The GWA can isolate;

We are here with our new technologies engineered by NOV to solve the latest oilfield problems, and to help our clients achieve lasting success.

The Gas Watch™ Analyzer is the oil and gas industry’s most innovative, versatile, and easy-to-use gas detection system.

The GWA can isolate;

methane (C1),
ethane (C2),
propane (C3),
butane (C4), and
pentane (C5)

gas values then calculates them into a total gas value for a more accurate total gas reading versus older technologies. Wetness, balance, and character ratio formulas are processed and exported every second to the EDR, providing ratio values and ratio signatures in real-time while drilling.

Use Gas Watch Analyzer for total gas detection and full analysis

Internally, the Gas Watch Analyzer (GWA) always isolates C1-C5 from the gas sample. The Total Gas Data value is the sum of this C1-C5 data thus providing a more accurate Total Gas value compared to other Total Gas Detector technologies.

From spud to sample point, when only total gas data is needed the GWA detects total gas in units and exports via WITS protocol to any EDR in one-second intervals.

At sample point the GWA can export full compositional C1-C5 in parts per million (ppm) every second, much quicker than any gas chromatograph providing more gas data intervals per GC cycle.

Gas Ratios

With the C1-C5 values properly isolated, industry derived gas ratio formulas are useful in characterization of the hydrocarbons and in identifying oil and water contact points. The GWA exports wetness, balance, and character ratios in real time.

Wetness Ratio = C2+C3+C4+C5 X 100
C1+C2+C3+C4+C5

Balance Ratio = C1+C2
C3+C4+C5

Character Ratio = C4+C5
C3

Fluid Characterization Using Wetness And Balance

If the Balance Ratio is greater than the Wetness Ratio, gas is predicted. The closer the curves converge the denser the gas and more likely to be productive.

The Gas - Oil - Contact (GOC) is defined by the cross over point of the two ratio curves.

When the Wetness Ratio is greater than the Balance Ratio, oil is predicted. The closer the curves converge the lighter the oil. The greater the separation of the curves then the heavier the oil and the more likely it is to be unproductive or residual.

The Oil - Water - Contact (OWC) point is classified by a sharp increase in the Wetness Ratio accompanied by a greater separation of the two curves. The OWC point reflects a greater proportion of heavier hydrocarbons typically associated with residual oil.

Low maintenance gas trap

GRI design-compliant gas trap

The Gas Watch Analyzer System agitates its sample gas with an industry standard quantitative gas measurement gas trap. The Gas Watch gas trap has been equipped with stainless-steel beater bar assembly to reduce wellsite maintenance and ensure consistent agitation regardless of shaker design. M/D Totco is deploying a new and improved moisture removal system that can run for 30+ days without service

The Gas Watch Analyzer package is equipped with Gas Analyzer, wireless link to the electronic drilling recorder (EDR), a laptop with GEOstrip Systems Striplog and Gas Watch gas trap. The GEOstrip Systems Striplog provides the Wellsite Information Transfer Standard (WITS) link capability to view all Gas Watch Analyzer and EDR data, gas ratio calculations, and ability to export LAS files.

Total gas or full C1-C5 composition capability

Operate as a regular total gas detector and can be selected to export C1 through C5.

Patented infrared spectrometry

Using a state of the art infrared spectrometer calibrated for real life gas mixtures, the Gas Watch Analyzer isolates each hydrocarbon type out of a mixture with the accuracy of a Gas Chromatograph every second.

Fastest C1-C5 gas data with real-time gas ratio calculations

Wetness, balance, and character ratio formulas are processed and exported every second providing ratio values and ratio signatures in real-time while drilling.

Geosteering

Gas ratio profiles can be a valuable tool when geosteering directional wells, assisting in pinpointing the target hydrocarbon fluid state and maximizing production.

Wireless unit advantage

Wireless data is encrypted and secure.
Reduces risk to personnel by removing sample poly line from shaker to geologist/Mudlogger shack.

Rig safe and tough

Engineered in a rig tough explosion proof approved enclosure.

Easy rig-up

Wireless connections, elimination of gas sample tubing and a rugged yet lightweight unit (35 lbs) significantly reduce rig-up time.

Local and remote monitoring

Status lights let rig personnel know when the unit is initializing, operating properly, or in need of service.
Internal diagnostics monitor and send alarms when any operational issues are detected. Units are remotely monitored daily to ensure maximum uptime.