Systems and methods for casing detection using resonant structures
First Claim
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1. A system for detecting a well structure comprising:
- an electrically conductive first well structure; and
a resonant structure attached to the first well structure, the resonant structure having a resonant frequency, and the resonant structure comprising an electromagnetically resonant structure,the resonant structure being provided to generate a time varying magnetic response field having a frequency at or near the resonant frequency upon either;
inducement of a time varying magnetic inducing field at or near the resonant frequency in proximity of the first well structure, the time varying magnetic inducing field provided by a ranging device in a second well structure, orinducement of a current in the first well structure at or near the resonant frequency, the current created by the time varying magnetic inducing field.
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Abstract
A well casing detection system includes a well casing and a ranging tool. The well casing includes a beacon with a resonant structure and a power supply. The ranging tool includes a magnetic field inducer, a magnetic field detector, and a power supply. This detection system is used to remotely detect well casing while it is deployed in a well, and may be used in conjunction with measurement while drilling (MWD) methods, logging while drilling (LWD) methods, coiled tubing drilling methods, steam assisted gravity drainage (SAGD), and wireline drilling methods, such that an operator may simultaneously direct the operation of a drill while operating the detection system.
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Citations
30 Claims
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1. A system for detecting a well structure comprising:
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an electrically conductive first well structure; and a resonant structure attached to the first well structure, the resonant structure having a resonant frequency, and the resonant structure comprising an electromagnetically resonant structure, the resonant structure being provided to generate a time varying magnetic response field having a frequency at or near the resonant frequency upon either; inducement of a time varying magnetic inducing field at or near the resonant frequency in proximity of the first well structure, the time varying magnetic inducing field provided by a ranging device in a second well structure, or inducement of a current in the first well structure at or near the resonant frequency, the current created by the time varying magnetic inducing field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22)
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19. The system of 1, wherein upon detection of a signal, the resonant structure changes from a low power state to a high power state.
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23. A system for detecting a well structure comprising:
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an electrically conductive first well structure; a resonant structure located on the first well structure and having at least one resonant frequency; and a ranging device in a second well structure; the resonant structure being provided to produce a time varying magnetic response field upon either; inducement of a time varying magnetic inducing field in proximity of the first well structure the time varying magnetic inducing field provided by the ranging device, or inducement of a current in the first well structure, the current created by the time varying magnetic inducing field; the ranging device being provided to induce the inducing field, to obtain a measurement of the response field, and to determine at least one location parameter between the ranging device and the resonant structure based upon the measurement of the response field; and wherein the frequencies of the response field, inducing field, and current in the first well structure are at or near the resonant frequency of the resonant structure; and wherein the ranging device is further provided to induce a time varying magnetic inducing field with a swept range of frequencies.
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24. A system for detecting a well structure comprising:
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an electrically conductive first well structure; a resonant structure located on the first well structure and having at least one resonant frequency; and a ranging device in a second well structure; the resonant structure being provided to produce a time varying magnetic response field upon either; inducement of a time varying magnetic inducing field in proximity of the first well structure, the time varying magnetic inducing field provided by a ranging device in a second well structure, or inducement of a current in the first well structure, the current created by the time varying magnetic inducing field; the ranging device being provided to induce the inducing field, to obtain a measurement of the response field, and to determine at least one location parameter between the ranging device and the resonant structure based upon the measurement of the response field; and wherein the frequencies of the response field, inducing field, and current in the first well structure are at or near the resonant frequency of the resonant structure; and wherein the ranging device is further provided to have a selectable frequency of the inducing field.
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25. A method for detecting a well casing comprising:
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providing a resonant structure on the well casing, the resonant structure having a resonant frequency; producing a time varying magnetic response field from the resonant structure by either inducing a time varying magnetic inducing field by a ranging device in a well structure at or near the resonant frequency in proximity of the well casing or by inducing a current by the inducing field at or near the resonant frequency in the well casing; determining a measurement of the time varying magnetic response field produced by the inducing field or by the current in the well casing; and determining a location of the well casing based upon the measurement. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification