REPLACEMENT OF FAILED DOWNHOLE GAUGE (PDHG)
Permanent downhole monitoring of pressure and temperature greatly improves our understanding of reservoir performance and production enhancement opportunities. Traditionally this has been achieved with a cabled permanent downhole gauge (PDHG), which provides real-time data at a specific depth.
The loss of a cabled permanent downhole gauge (PDHG), due to issues such as splicing errors, broken cabled connectors, grounding out, sensor failure or during well service activities, can seriously impede a well operator’s ability to monitor and optimise a well’s performance. Traditional remediation methods require a potentially costly well intervention program which is often un-economic or impractical when considering both service costs and loss of production.
Acoustic Data’s SonicGauge™ Wireless Monitoring System can be retrofitted into a well where a cabled PDHG has failed or into new or brownfield developments where no monitoring was previously installed. The system has been designed to minimise installation costs with the Barracuda™ HEX-Hanger™ (high expansion gauge hanger) being installed via conventional slickline methods. The HEX-Hanger does not require a nipple profile, so the SonicGauge can be set virtually anywhere in the completion by the battery-powered Electro-SET™ (electro-mechanical setting tool).
Unlike a cabled PDHG that measures pressure and temperature at a single point in the tubing, SonicRepeater stations have onboard pressure transducers that allow the well’s flowing and static pressure gradients to be measured in real-time, an invaluable tool for real-time production optimisation.
CASE STUDY | MAJOR MALAYSIAN OPERATOR
The client has estimated that the installation of the SonicGauge™ Wireless Monitoring System will save millions of dollars across a 5-year installation period by removing the requirement to perform memory gauge surveys and shut in the well, leading to lost production.
The client is managing an ageing oilfield in which only 50% of active wells are equipped with Permanent Downhole Monitoring Systems (PDHMS). The Reservoir Team formulated a reservoir surveillance plan for the remaining production wells from which they required frequent downhole P&T data. They required a cost-effective real-time solution that would work over a multi-year duration and could be retrofitted to their existing well stock.
Acoustic Data retrofitted a turnkey SonicGauge™ Wireless monitoring system in three slickline runs during a 12-hour period. The SonicGauge™ sensor and SonicRepeater stations were set in 4-1/2” tubing at depths of 800m (2,643ft), 500m (1,640ft) and 200m (656ft).
The Barracuda™ HEX-Hanger™ technology is not reliant on nipple profiles for installation and allowed the gauges to be located at the exact depths required by the client. When the Barracuda™ Electro-SET™ (electro-mechanical setting tool) was recovered to surface after each run, the on-board data logs showed that the HEX-Hangers were optimally set.
The SonicGauge™ System provides one data point every 6 hours with an expected system life of five years. Real-time downhole pressure and temperature data was immediately available at surface and viewed at Acoustic Data headquarters via the 4G-WiFi communication module located in the SonicGauge™ Data Logger, which was also patched into the customer's distributed control system (DCS) via a Modbus communication port.