The Monitor of Fracture Azimuth Based on Pseudo Random Emission Current
ICEICE '12 Proceedings of the 2012 Second International Conference on Electric Information and Control Engineering - Volume 03(2012)
Abstract
Fracturing is an important segment in the sequences of exploring oil, which is also the indispensable means of increasing gas production. Resistivity difference is the premise of monitoring fracture azimuth. We can inject high ionization working liquid into fracturing layer, which lead to the changes of formation resistivity. But because the oil is deep, so the changes of surface potential gradient is small. At the same time, there are all kinds of natural and artificial noise on the earth. So our measuring instrument must have strong anti-interference ability and high accuracy. It can restrain noise by adopting the pseudo random signal as artificial field source and use correlation detection principle. So we can extract the surface potential gradient caused by artificial field source and improve the accuracy of judging fracture extension direction.
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Key words
artificial field source,surface potential gradient,artificial noise,formation resistivity,fracture azimuth,fracture extension direction,high accuracy,high ionization,resistivity difference,fracturing layer,Fracture Azimuth,Pseudo Random Emission Current
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