Determination of Propped Fracture Length by Detection of Injected Magnetic Material with Surface Superconducting Magnetometers

摘要

Superconducting SQUID magnetometer and data acquisition hardware and software were developed and tested, and a surface array of seven SQUIDS was deployed to map a magnetically tagged proppant in two field tests at the Amoco Catoosa research site near Tulsa. Accomplishments leading to the Catoosa tests included: (1) development of theoretical solutions of the magnetic fields for a variety of magnetically tagged proppant geometries and dimensions; (2) scale modeling using proppant tag materials; (3) extension of tiltmeter real-time analysis to support the magnetometer field tests; and (4) two sets of field shakedown experiments to pretest the magnetometers and data acquisition hardware and software. For the second set of Catoosa tests, conducted after all modifications of the magnetometers had been completed, the SQUID data were analyzed to successfully map a shallow, magnetically tagged proppant in a horizontal fracture, for which the radius was determined to be 60 feet at shut-in, with disk center offset to the east-northeast of the well bore.