Production Increased Fivefold By Managing Drawdown | Schlumberger
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Norway, Europe, Offshore
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Challenge: Manage reservoir drawdown in Statoil’s Gulfaks field in wells that are equipped with downhole pressure gauges as well as those that are not so equipped

Solution: In wells with WellWatcher real-time reservoir and production monitoring systems, the oil production rate was maximized by maintaining bottomhole flowing pressure slightly above bubblepoint pressure. In wells without downhole permanent gauges, production was optimized using calibration curves based on empirical multiphase equations and pressure data from WellWatcher systems in nearby wells

Results: Statoil increased production fivefold from 630 to 3,145 bbl/d on a well-by-well basis

Products Used
WellWatcher Quartz LT Gauge
WellWatcher Quartz Extend Gauge
WellWatcher Quartz Gauge
WellWatcher Sapphire Gauge

Production Increased Fivefold By Managing Drawdown

Statoil benefits from monitoring bottomhole pressure and temperature

Real-time downhole monitoring

The Gulfaks field development for Statoil consists primarily of single-phase oil flow without free gas. Some of the offshore platform wells with bottomhole pressure of approximately 28 MPa [4,000 psi] had been equipped with WellWatcher real-time reservoir and production monitoring systems to continuously monitor bottomhole flowing pressure and temperature. The challenge was to adequately manage reservoir drawdown in those wells not equipped with any bottomhole pressure measuring system.

Maintaining bottomhole flowing pressure maximized production

In wells with WellWatcher system gauges, oil production was maximized by adjusting the flow rate to maintain bottomhole flowing pressure slightly above bubblepoint pressure. In wells without downhole permanent gauges, production was optimized using calibration curves based on empirical multiphase equations and pressure data from downhole permanent gauges in nearby wells. Statoil enhanced production from 100 to 500 m³/d [630 to 3,145 bbl/d] on a well-by-well basis, a fivefold increase.

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WellWatcher Quartz LT

High-resolution PT gauge

Acquire accurate, high-resolution pressure data for long-term production monitoring applications to 130 degC and 10,000 psi.

WellWatcher Quartz Extend

AC- or DC-powered high-resolution dual-sensor PT gauge

Acquire continuous pressure and temperature data—and downhole flow rate measurements based on the ΔP method.

WellWatcher Quartz

Premium high-temperature, high-resolution PT gauge

Continuously monitor downhole pressure and temperature in real time with up to eight high-resolution gauges on a single cable.

WellWatcher Sapphire

PT gauge

Acquire accurate, stable pressure data for long-term reservoir and production monitoring applications to 110 degC and 10,000 psi.

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