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SPECIAL REPORT: NEXT GENERATION WIRELINE LOGGING TECHNOLOGY FOR MODERN OIL AND GAS OPERATIONS

GOWell’s latest generation PEC tool the MTD-E is configurable for optimum data acquisition and is fully combinable with other casing inspection and logging sensors

Both Proactive and Reactive Monitoring Surface casing vent flow is one example of a serious well integrity problem where formation fluids uncontrollably escape to the surface. Possibly failure mechanisms include channeling through poor cement placement or by degradation of cement and subsequent pipe corrosion. In such cases, if running only standard casing inspection tools, crucial information may be overlooked such as pinpointing the exact depth of the fluid entry and the flow path to drive remedial actions. This makes a distinction between casing inspection and leak detection, the latter being always in reactive mode or “after the fact” diagnostics whereas the former serves as proactive monitoring for preventive purposes. A cement bond log may serve to identify poor cement zones to corroborate results from leak detection tools.

Temperature and Noise Logs When used regularly during a well’s lifecycle, multi-finger caliper and EM corrosion logs can be used to monitor corrosion and help mitigate serious leaks or well failures. However in situations where a downhole problem is causing a fluid leak in the tubing or casing, then additional diagnostics can be used to locate the leak. Such abnormal flow conditions can be assessed by various techniques ranging from a simple temperature log to more sophisticated leak-detection noise log. Temperature logs have been used for decades and should not be forgotten but can be tricky to interpret conclusively. Noise logs were originally acquired using a downhole hydrophone and an operator listening through a set of headphones. Today’s noise tools consist of a wide-band hydrophone with digital signal processing to produce a frequency spectrum log (spectral noise logging). However, noise logging does have its challenges. These include how to eliminate

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unwanted noise not associated with leaks while still having enough sensitivity to pickup minor leaks. In many cases this can only be achieved by a series of stationary measurements which are time-consuming to acquire and can completely miss the leak interval. GOWell’s next generation noise logging tool will feature a large array of acoustic sensors and employ processing that allows for a robust extraction of the small leak signals while logging continuously. It is sometimes not possible to reproduce leaks unless similar well conditions at which the leak occurs are recreated. Additionally, the leak may not clearly manifest unless a minimum pressure differential across the pipe or flow path is established. Such pressure differentials also make for sufficiently high velocities and associated noise beyond base line noise, necessary for leak detection/ discrimination. Certain temperature profiles may also lead to pipe expansion profiles and anomalies that may disappear or change when a different temperature profile develops. This is common in Steam Assisted Gravity Drainage wells (SAGD). The increasing needs of the oil and gas industry in the Well Integrity arena are driving the demand for new technologies. Logging measurements and techniques for casing and annuli evaluation play an important role and are continuing to evolve. GOWell is focused on developing and deploying advanced Well Integrity solutions for the global logging industry – a partner today and in the future ready to support wherever and whenever.

Contact Details 10642 W. Little York Rd. Houston, TX 77041, USA Tel: +1 (713) 909-2555 sales.usa@gowellpetro.com www.gowellpetro.com

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Offshore Technology Reports – Next Generation Wireline Logging Technology for Modern Oil & Gas Op's  

Defence Industry – Special Report on Next Generation Wireline Technology for Modern Oil and Gas Operations

Offshore Technology Reports – Next Generation Wireline Logging Technology for Modern Oil & Gas Op's  

Defence Industry – Special Report on Next Generation Wireline Technology for Modern Oil and Gas Operations