System and method for elevated source to borehole electromagnetic survey
First Claim
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1. A method to determine a property of an earth formation, comprising:
- providing a mobile electromagnetic (EM) transmitter comprising a multi-turn coil of wire disposed at one or more predetermined elevated heights above a surface of the earth and not in contact with the surface of the earth;
providing one or more receivers moveably disposed in a wellbore penetrating the earth formation;
transmitting electromagnetic energy from the mobile transmitter into the formation from a plurality of locations by moving the mobile transmitter in a spiral pattern;
receiving a signal from the formation with the one or more receivers;
wherein the spiral pattern the mobile transmitter is moved in is spiral with respect to the one or more receivers;
using the signal received by the one or more receivers to determine the property of the formation.
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Abstract
Methods and systems are provided to determine a property of an earth formation, comprising a mobile transmitter disposed at a predetermined elevated height above a surface of the earth formation, and one or more receivers moveably disposed in a wellbore penetrating the earth formation. Electromagnetic energy is transmitted from the mobile transmitter into the formation from a plurality of locations; and at the one or more receivers a signal is measured. Using the signal received by the one or more receivers, a property of the formation, such as resistivity, can be determined and mapped.
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Citations
18 Claims
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1. A method to determine a property of an earth formation, comprising:
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providing a mobile electromagnetic (EM) transmitter comprising a multi-turn coil of wire disposed at one or more predetermined elevated heights above a surface of the earth and not in contact with the surface of the earth; providing one or more receivers moveably disposed in a wellbore penetrating the earth formation; transmitting electromagnetic energy from the mobile transmitter into the formation from a plurality of locations by moving the mobile transmitter in a spiral pattern; receiving a signal from the formation with the one or more receivers; wherein the spiral pattern the mobile transmitter is moved in is spiral with respect to the one or more receivers; using the signal received by the one or more receivers to determine the property of the formation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 16)
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11. A system to determine a property of an earth formation, comprising:
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a mobile electromagnetic (EM) transmitter coil disposed at one or more predetermined elevated heights above a surface of the earth and not in contact with the surface of the earth, wherein the mobile transmitter is adapted to transmit electromagnetic energy into the formation and is affixed to a mobile vehicle moving in a spiral pattern; a plurality of receivers moveably disposed in a wellbore penetrating the earth formation wherein the receivers are each adapted to receive a signal from the formation, wherein the spiral pattern the mobile transmitter is moved in is spiral with respect to the plurality of receivers; and a computer means for inverting the signals received by the plurality of receivers to determine the property of the formation. - View Dependent Claims (12, 13, 14, 17)
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15. A method for reservoir evaluation using mobile transmitters with in-borehole measurements, comprising:
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positioning an electromagnetic (EM) transmitter elevated above the Earth'"'"'s surface and not in contact with the Earth'"'"'s surface; broadcasting an EM signal through the Earth; providing an array of downhole electromagnetic receivers in a wellbore; measuring the EM signal broadcast through the earth at each of the downhole electromagnetic receivers; moving the transmitter to a number of locations in a spiral pattern with respect to the array of downhole electromagnetic receivers; repeating the step of measuring the EM signal broadcast through the earth at each of the downhole electromagnetic receivers; and imaging the formation resistivity of an area about the wellbore from measurements taken by the electromagnetic receivers of the EM signal. - View Dependent Claims (18)
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Specification