A new kind of high-resolution SP logging electrode array for oil reservior

Abstract:

Aimed at the problems of high interference in measurement and low logging curve resolution for the logging electrode array used at present which still adopts original surface reference electrode,this paper designs a high-resolution SP logging electrode array of downhole reference electrode.The electrode array adopts array structure.It is insulative between the electrodes each other.The tool identifies the reference electrode of shaly formation automatically through singlechip when it is lifted,then it takes shale potential as the reference potential to measure SP.The field test results are satisfactory.The capacity of resisting disturbance and curve resolution are improved obviously compared with original SP logging electrode array.