Down hole tool for determination of formation properties
DCFirst Claim
1. A multi purpose downhole tool for obtaining data regarding formation fluid properties comprising:
- formation fluid pulsing means having an inlet positioned to provide fluid communication between the formation fluids and the interior of the tool for selectively creating a pressure transient in the formation fluid zone;
packer means mounted above and below said inlet of said formation fluid pulsing means for sealing off a segment of the bore hole from well fluids located above and below said packer means;
pressure sensing means for detecting a formation pressure transient created by said pulsing means.
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Abstract
The apparatus of the present invention relates to a down hole tool capable of extraction of valid samples and making pressure measurements useful in calculating formation permeability. The tool incorporates the features of a staddle packing to allow formation fluid specimens to be taken at large flow rates without depressing the pressure below the formation fluid bubble point. When used in combination with a pressure probe the tool is used to obtain meaningful permeability readings in a larger radius area than previously permitted with known dsigns. Additionally, the apparatus of the present invention allows flow control during the creation of the pressure pulse which enhances extraction of valid samples and the permeability determination. The apparatus may be modularly constructed so that in a single descent of the tool, a pressure profile of the zone of interest can be made, a fluid analysis can be made at each station, multiple uncontaminated fluid samples can be withdrawn at pressures above the bubble point, local vertical and horizontal permeability measurements can be made at each station, a packer module can be set at a location dictated by previous measurements and a large scale pressure build up test can be performed.
524 Citations
28 Claims
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1. A multi purpose downhole tool for obtaining data regarding formation fluid properties comprising:
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formation fluid pulsing means having an inlet positioned to provide fluid communication between the formation fluids and the interior of the tool for selectively creating a pressure transient in the formation fluid zone; packer means mounted above and below said inlet of said formation fluid pulsing means for sealing off a segment of the bore hole from well fluids located above and below said packer means; pressure sensing means for detecting a formation pressure transient created by said pulsing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A multi purpose downhole tool for obtaining data regarding formation properties comprising:
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formation fluid pulsing means having an inlet positioned to provide fluid communication between the formation fluids and the interior of the tool for selectively creating a pressure transient in the formation fluid zone; flow control means for regulating the fluid flow rate between the formation fluid and the tool in a manner as to prevent reduction of pressure of formation fluid flowing into said inlet, below its bubble point; pressure sensing means for detecting a formation pressure transient created by said pulsing means. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification