Patent ID: 7496258
Filing Date: 2009-02-24
Classification: E21B,G01D,G01M,G02B

Abstract:
1. A hydrocarbon monitoring cable for positioning in a downhole environment, the hydrocarbon monitoring cable comprising: a fiber optic core; a carbon layer about said fiber optic core to provide shielding from exposure to a fiber optic defect causing agent of the downhole environment, said carbon layer having a first coefficient of thermal expansion; an outer polymer layer about said carbon layer and of a second coefficient of thermal expansion; an intermediate polymer layer disposed between said carbon layer and said outer polymer layer, said intermediate polymer layer having a third coefficient of thermal expansion selected based on the first and second coefficients of thermal expansion; and a positively charged electrically conductive layer about said outer polymer layer to repel a fiber optic defect causing agent of the downhole environment away from said fiber optic core.