Methods and apparatus for measuring formation properties
First Claim
1. A method of measuring a formation property, the method comprising:
- disposing a drill collar in a borehole at a first depth, the drill collar comprising a formation tester tool, a formation probe assembly, and at least a first sensor and a second sensor;
engaging the formation tester tool with an earth formation using the formation probe assembly;
selectively sampling at least one of the first and second sensors;
making at least a first and a second measurement; and
comparing the first measurement to the second measurement.
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Accused Products
Abstract
This application relates to various methods and apparatus for rapidly obtaining accurate formation property data from a drilled earthen borehole. Quickly obtaining accurate formation property data, including formation fluid pressure, is vital to beneficially describing the various formations being intersected. For example, methods are disclosed for collecting numerous property values with a minimum of downhole tools, correcting and calibrating downhole measurements and sensors, and developing complete formation predictors and models by acquiring a diverse set of direct formation measurements, such as formation fluid pressure and temperature. Also disclosed are various methods of using of accurately and quickly obtained formation property data.
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Citations
38 Claims
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1. A method of measuring a formation property, the method comprising:
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disposing a drill collar in a borehole at a first depth, the drill collar comprising a formation tester tool, a formation probe assembly, and at least a first sensor and a second sensor;
engaging the formation tester tool with an earth formation using the formation probe assembly;
selectively sampling at least one of the first and second sensors;
making at least a first and a second measurement; and
comparing the first measurement to the second measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of measuring a formation property, the method comprising:
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disposing a drill collar in a borehole at a first depth, the drill collar comprising a formation tester tool, a formation probe assembly and a first sensor;
engaging the formation tester tool with an earth formation using the formation probe assembly;
making at least a first measurement; and
adjusting the first measurement. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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33. A method of measuring a formation property, the method comprising:
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disposing a drill collar in a borehole, the drill collar comprising a formation tester tool, a formation probe assembly and a sensor;
engaging the formation tester tool with a formation using the formation probe assembly;
injecting a fluid from the formation probe assembly into the formation; and
measuring a pressure. - View Dependent Claims (34, 35)
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36. A method of measuring a formation property, the method comprising:
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disposing a drill collar in a borehole at a first depth, the drill collar comprising a formation tester tool and a formation probe assembly having an extendable probe;
extending the probe;
engaging the probe with an earth formation;
maintaining a substantially non-flow condition within the formation probe assembly; and
measuring a formation property. - View Dependent Claims (37, 38)
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Specification