Method and apparatus for sampling formation fluids
First Claim
1. A method of retrieving a formation fluid from a formation adjacent a borehole wall, comprising:
- lowering a tool into the wellbore;
initiating a first retrieval process, the first retrieval process including attempting to increase the mobility of the formation fluid;
measuring at least one downhole parameter related to the mobility of the fluid;
changing the first retrieval process based on the measured downhole parameter;
initiating a second retrieval process, the second retrieval process including increasing the mobility of the formation fluid; and
retrieving the formation fluid sample from the formation with the tool.
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Abstract
A method of retrieving a formation fluid from a formation adjacent a borehole wall includes estimating at least one of a permeability of the formation and a viscosity of the formation fluid. A first tool is selected based on the estimation, the first tool being selected from one of a heating and sampling tool, an injection and sampling tool, and a coring tool. An attempt to retrieve a formation fluid sample from the formation is then made with the first tool, and a formation fluid sample is retrieved from the formation. A second retrieval process may then be initiated, in which the second retrieval process includes increasing the mobility of the formation fluid.
31 Citations
13 Claims
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1. A method of retrieving a formation fluid from a formation adjacent a borehole wall, comprising:
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lowering a tool into the wellbore; initiating a first retrieval process, the first retrieval process including attempting to increase the mobility of the formation fluid; measuring at least one downhole parameter related to the mobility of the fluid; changing the first retrieval process based on the measured downhole parameter; initiating a second retrieval process, the second retrieval process including increasing the mobility of the formation fluid; and retrieving the formation fluid sample from the formation with the tool. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification