Claims
- 1] A method for calibrating a well-logging sensor, comprising:
emitting a first signal into a first calibration substance disposed proximate to the sensor; measuring a first sensor response from the first signal; emitting a second signal into a second calibration substance disposed proximate to the sensor; measuring a second sensor response from the second signal; and determining a sensor response function from the first sensor response and the second sensor response.
- 2] The method of claim 1, wherein the sensor response function is a linear function.
- 3] The method of claim 1, wherein the well-logging sensor is a density sensor.
- 4] The method of claim 3, wherein one of the first calibration substance and the second calibration substance is an aluminum alloy.
- 5] The method of claim 3, wherein one of the first calibration substance and the second calibration substance is a magnesium alloy.
- 6] The method of claim 1, wherein the well-logging sensor is a neutron sensor.
- 7] The method of claim 6, wherein the neutron sensor is surrounded by water and the first and second calibration substances are disposed in a channel within the neutron sensor.
- 8] The method of claim 7, wherein one of the first calibration substance and the second calibration substance is air.
- 9] The method of claim 7, wherein one of the first calibration substance and the second calibration substance is a polymer rod having a known effective porosity.
- 10] The method of claim 1, further comprising:
determining an expected range for a quality check response of a quality-check substance; emitting a quality check signal into the quality-check substance disposed proximate to the sensor; measuring the quality check response from the quality check signal and comparing the expected range with the quality check response.
- 11] The method of claim 10, wherein the quality-check substance is water.
- 12] A method for calibrating a well-logging sensor, comprising:
emitting a first signal into a first calibration substance disposed proximate to the sensor; measuring a first sensor response from the first signal; emitting a second signal into a second calibration substance disposed proximate to the sensor; measuring a second sensor response from the second signal; and emitting a third signal into a third calibration substance disposed proximate to the sensor; measuring a third sensor response from the third signal; and determining a sensor response function from the first sensor response, the second sensor response, and the third sensor response.
- 13] A method for calibrating a well-logging sensor, comprising:
providing a well-logging sensor having a known response function; determining an expected range of a quality check response of the sensor using a quality-check substance with known properties; emitting a quality check signal into the quality-check substance disposed proximate to the sensor; measuring the quality check response from the quality check signal; and comparing the expected range with the quality check response.
- 14] The method of claim 13, wherein the sensor is calibrated using at least one calibration substance, and the quality-check substance is different from the at least one calibration substance.
- 15] The method of claim 14, wherein the quality-check substance is water.
- 16] A method for calibrating a well-logging density sensor, comprising:
emitting a first gamma ray signal into an aluminum alloy block disposed proximate to the sensor; measuring a first density sensor response from the first gamma ray signal; emitting a second gamma ray signal into a magnesium alloy block disposed proximate to the sensor; measuring a second density sensor response from the second gamma ray signal; and determining a density sensor response function from the first density sensor response and the second density sensor response.
- 17] The method of claim 16, wherein the density sensor response function is linear.
- 18] The method of claim 16, further comprising:
determining an expected range for a quality check response using water as a quality-check substance from the density response function; emitting a quality check gamma ray signal into the water disposed proximate to the density sensor; measuring the quality check response from the quality check gamma ray signal; and comparing the expected range of the quality check response with the quality check response.
- 19. A method for calibrating a well-logging density sensor, comprising:
emitting a first gamma ray signal into an aluminum alloy block disposed proximate to the sensor; measuring a first density sensor response from the first gamma ray signal; emitting a second gamma ray signal into a magnesium alloy block disposed proximate to the sensor; measuring a second density sensor response from the second gamma ray signal; emitting a third gamma ray signal into water disposed proximate to the sensor; measuring a third density sensor response from the third gamma ray signal; and determining a density sensor response function from the first density sensor response, the second density sensor response, and the third density sensor response.
- 20] A method for calibrating a well-logging neutron sensor, comprising:
emitting a first neutron signal with air disposed in a channel within the sensor; measuring a first neutron sensor response from the first neutron signal; emitting a second neutron signal with a polymer rod disposed in the sensor channel; measuring a second neutron sensor response based on the second neutron signal; and determining a neutron sensor response function from the first neutron sensor response and the second neutron sensor response.
- 21] The method of claim 20, wherein the neutron sensor response function is linear.
- 22] The method of claim 20, further comprising:
determining an expected range for a quality check response from the neutron sensor response function; emitting a quality check neutron signal with water in the sensor channel; measuring the quality check response from the quality-check signal; and comparing the expected range of the quality check response with the quality check response.
- 23] A method for calibrating a well-logging neutron sensor, comprising:
emitting a first neutron signal with air disposed in a channel within the sensor; measuring a first neutron sensor response from the first neutron signal; emitting a second neutron signal with a polymer rod disposed in the sensor channel; measuring a second neutron sensor response based on the second neutron signal; and emitting a third neutron signal with water disposed in the sensor channel; measuring a third neutron sensor response based on the third neutron signal; and determining a neutron sensor response function from the first neutron sensor response and the third neutron sensor response.
- 24] A method of calibrating a well-logging sensor, comprising:
emitting a signal into each of at least two calibration substances disposed proximate to the sensor; measuring at least two sensor responses corresponding to the signals emitted into said disposed calibration substances; and determining a sensor response function from the at least two sensor responses.
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of U.S. Provisional Patent Application 60/345,615, filed on Oct. 19, 2001.
Provisional Applications (1)
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Number |
Date |
Country |
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60345615 |
Oct 2001 |
US |