A field trial to test fiber optic sensors for temperature and pressure measurements was completed in two temperature observation wells in a steam flood area of the West Coalinga Field in Coalinga, California. Objectives of the trial were to test a novel hydraulic deployment system that can easily install and retrieve fiper optic sensors from wellbores, and to test the data quality from a fiber optic Distributed Temperature Sensor (DTS) and a pressure sensor.Deployment of the temperature and pressure fiber optic sensors was successfully demonstrated by using the hydraulic deployment technique. Excellent data correlation was obtained between the DTS and the conventional wireline conveyed temperature survey tools. Similarly, the pressure sensor showed impressive resolution and dynamic response capabilities. Since the fiber optic system has the capability of providing continuous reservoir temperature and pressure data, reservoir management in primary or assisted recovery projects can be improved.
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AbstractOver the past ten years Chevron and SensorDynamics have partnered in developing a practical approach to intensive surveillance of remote downhole oil and gas wells and related production infrastructure. The work has resulted in a unique family of slim-line fiber optic sensors, along with a simple method of deploying these sensors remotely in oil and gas wells, using conventional hydraulic control lines as pathways into the heart of the reservoir. Most importantly the program has also produced coating technology that stabilizes the fiber optic sensors and cables in the high-temperature, high-pressure environments of deep wells. Sensors cover a wide range of parameters, including distributed temperature, pressure, acoustic sensors and acoustic sensor arrays for in-reservoir imaging of formation, fluid front movements and seismic relaxation. The result of this long-term partnership has been an integrated solution that forms a credible basis for permanent and intensive surveillance of oil and gas reservoirs, a solution that ensures availability of dynamic downhole data over the life of a reservoir. It has the additional advantage of allowing sensor up-grade, sensor replacement and the addition of new sensor types as these become available -without interruption of normal production and at minimal incremental cost. We report on a system that can address EOR applications, intelligent well monitoring and that we believe offers a basis for instrumenting deep and hot sub-sea reservoirs and sub-sea production infrastructure. We report some of the key issues in deploying sensors in hydraulic control lines in oil wells, in protecting sensors in harsh downhole environments (250deg C, 600 bar) and sensor performance results, from laboratory and field test work. We also offer some views on the implications to the future of realtime integrated reservoir management, where availability of downhole information has important value in all phases of the life of a field -from cradle to grave.
A field trial to test fiber optic sensors for temperature and pressure measurements was completed in two temperature observation wells in a steam flood area of the West Coalinga Field in Coalinga, California. Objectives of the trial were to test a novel hydraulic deployment system that can easily install and retrieve fiper optic sensors from wellbores, and to test the data quality from a fiber optic Distributed Temperature Sensor (DTS) and a pressure sensor.Deployment of the temperature and pressure fiber optic sensors was successfully demonstrated by using the hydraulic deployment technique. Excellent data correlation was obtained between the DTS and the conventional wireline conveyed temperature survey tools. Similarly, the pressure sensor showed impressive resolution and dynamic response capabilities. Since the fiber optic system has the capability of providing continuous reservoir temperature and pressure data, reservoir management in primary or assisted recovery projects can be improved.
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