COBEM99

S4 Ciências e Engenharia do Petróleo

Title:

ACOUSTIC DATA TRANSMISSION SYSTEM FOR OIL PRODUCTION PIPELINE

Summary :

THE OPTIMAL OPERATION OF AN OIL WELL REQUIRES THE PERIODIC MEASUREMENT OF THE DOWNHOLE PRESSURE. IN THIS WORK, ACOUSTIC WAVES ARE USED TO TRANSMIT DATA FROM A DOWNHOLE PRESSURE SENSOR TO SURFACE. THE ACOUSTIC WAVES PROPAGATE THROUGH THE WALL OF THE OIL PRODUCTION PIPELINE, MAKING UP A WIRELESS TRANSMISSION SYSTEM. BINARY DATA IS TRANSMITTED IN TWO FREQUENCIES, USING FSK MODULATION. THE TRANSMISSION FACES PROBLEMS WITH ATTENUATION AND STRONG DISTORTION CAUSED BY MULTIPLE REFLECTIONS AT THE JOINTS AND DUE TO FREQUENCY DEPENDENCY OF THE SOUND VELOCITY. A MODEL OF WAVE PROPAGATION IN PIPELINES WITH PERIODICAL JOINTS IS USED TO DETERMINE AN APPROPRIATE FREQUENCY RANGE OF OPERATION. ANOTHER MODEL IS USED TO DESIGN THE ACOUSTIC TRANSDUCER COUPLED TO THE PIPELINE. SUCCESSFUL RESULTS HAVE BEEN VERIFIED IN AN EXPERIMENTAL SET-UP. THE ACOUSTIC ATTENUATION WAS MEASURED IN A 600-M DEEP OIL WELL. AS WELL AS, AN ACOUSTIC MODEM WAS IMPLEMENTED IN A 100-M LONG PIPELINE WITH TRANSMISSION RATE OF 2 BIT/S.

Author :

Adamowski, Julio Cezar
Furukawa, Celso Massatoshi
Kuchpil, Cassio 0
Simões, Marcelo Godoy

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