Formation evaluation using phase shift periodic pressure pulse testing
AssigneeHalliburton Energy Services, Inc.
InventorsWilson C. Chin, Mark A. Proett
Life of this patent
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Abstract
The present invention provides an apparatus and method for determining geologic formation properties. A pressure wave is generated by a reciprocating piston transmitted to the formation by a probe. The pressure is sensed by a high accuracy quartz gauge in the probe. This pressure is compared to the pressure sensed at a spaced probe or to the flow rate of the piston to calculate permeability or other formation properties.
Claims23
A formation tester comprising;
- a means for generating a pressure wave in a geological formation;
- a first probe in contact with said geological formation, said first probe operably connected to said pressure wave generating means and a means for sensing at least two properties of said generated pressure wave;
- and
- a second probe located a predetermined distance from and within the same azimuthal angle as said first probe, said second probe operably connected to a means sensing at least two properties of said generated pressure wave.
A formation tester comprising:
- a first probe for generating a sinusoidal pressure wave in a geologic formation and having means for sensing at least two properties of said wave;
- a second probe spaced a predetermined distance from said first probe and having means for sensing at least two properties of said generated pressure wave;
- and
- means for comparing a property of said wave sensed at said first probe and at said second probe.
A method of determining properties of a geologic formation comprising:
- providing a tool having a first probe and a second probe located therein within a borehole
- in a geologic formation;
- generating a pressure wave in said geologic formation with said first probe in said tool;
- sensing at least two properties of said wave at said first probe and said second probe and comparing
- changes in the properties of said pressure wave between said probes.
A formation tester comprising:
- a first probe for generating a pressure wave in a geological formation, said first probe having a high accuracy quartz gauge for measuring the pressure of said wave;
- a second probe located a predetermined distance from and within the same azimuthal angle as said first probe for sensing properties of said generated pressure wave, said second probe having a high accuracy quartz gauge for measuring the pressure of said wave;
- a reciprocating piston connected to said first probe for generating said pressure wave
- means for comparing a sensed phase shift of said pressure wave at said first and second probes.
A formation tester comprising:
- a first probe for generating a sinusoidal pressure wave in a geological formation and having means for sensing properties of said wave;
- a second probe spaced a predetermined distance from said first probe and having means for sensing properties of said generated pressure wave;
- and
- means for comparing a phase shift of said wave sensed at said first probe and at said second probe.
A method of determining properties of a geological formation comprising:
- providing a tool having a first probe and a second probe therein within a borehole in a geological formation;
- generating a pressure wave in said geological formation with said first probe in said tool;
- and sensing a phase shift of said wave at said first probe and said second probe and comparing changes in said phase shift of said pressure wave between said probes.
Dependencies are inferred from the claim text.