Patent ID: 9638821
Date: 2017-05-02
CPC Classifications: G01R,G01V

Claim:
1. A method for mapping and monitoring of hydraulic fracture, the method comprising: capturing, using an array of sensors, a first magnetic image of a well pay zone, the first magnetic image comprising a baseline magnetic profile including Earth's magnetic field, and remnant sources of magnetism in the well pay zone, the first magnetic image comprising a first set of one of more vector measurements using the array of sensors; injecting a fluid into a well bore; capturing, using the array of sensors, a second magnetic image after the well bore is padded with the fluid, the second magnetic image comprising a second set of one of more vector measurements using the array of sensors; establishing a background based on the first and the second magnetic images; injecting a doped proppant into a stage of the well bore; capturing, using the array of sensors, a third magnetic image after the doped proppant is injected into the stage, the third magnetic image comprising a third set of one of more vector measurements using the array of sensors; and processing the third image to subtract the background and to obtain information regarding distribution of the fluid and the proppant in the stage.