Downhole determination of formation fluid properties
First Claim
1. A method for determining viscosity and density of fluid from formations surrounding an earth borehole, comprising the steps of:
- (a) suspending a formation testing device in the borehole;
(b) drawing formation fluid into the device;
(c) causing said fluid to flow in a flow line under a first set of conditions and causing said fluid to flow in said flow line under a second set of conditions;
(d) measuring a first fluid pressure differential across a portion of said flow line during fluid flow under said first set of conditions, and measuring a second pressure differential across said portion of said flow line during fluid flow under said second set of conditions; and
(e) determining density and viscosity of said fluid as a function of said first and second measured pressure differentials.
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Accused Products
Abstract
A method is disclosed for determining viscosity and density of fluid from formations surrounding an earth borehole, including the following steps: (a) suspending a formation testing device in the borehole; (b) drawing formation fluid into the device; (c) causing the fluid to flow in a flow line under a first set of conditions; (d) causing the fluid to flow in the flow line under a second set of conditions; (e) measuring a first fluid pressure differential in the flow line during fluid flow under the first set of conditions, and measuring a second pressure differential in the flow line during fluid flow under the second set of conditions; and (f) determining density and viscosity of the fluid as a function of the first and second measured pressure differentials.
43 Citations
29 Claims
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1. A method for determining viscosity and density of fluid from formations surrounding an earth borehole, comprising the steps of:
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(a) suspending a formation testing device in the borehole; (b) drawing formation fluid into the device; (c) causing said fluid to flow in a flow line under a first set of conditions and causing said fluid to flow in said flow line under a second set of conditions; (d) measuring a first fluid pressure differential across a portion of said flow line during fluid flow under said first set of conditions, and measuring a second pressure differential across said portion of said flow line during fluid flow under said second set of conditions; and (e) determining density and viscosity of said fluid as a function of said first and second measured pressure differentials. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining viscosity and density of fluid from formations surrounding an earth borehole, comprising the steps of:
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(a) suspending a formation testing device in the borehole; (b) drawing formation fluid into the device; (c) causing said fluid to flow in a flow line in said device at a first flow rate and through a first constriction, and measuring a first pressure differential on opposing sides of the constriction; (d) causing said fluid to flow in a flow line of device at a second flow rate and through a second constriction, and measuring a second pressure differential on opposing sides of the second constriction; and (e) determining the density and viscosity of said fluid as a function of said first and second measured pressure differentials. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. Apparatus for determining viscosity and density of fluid from formations surrounding a borehole, comprising:
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a formation testing device suspendible in the borehole, said device operating to draw fluid from surrounding formations and having a flow line in which said fluid can be caused to flow; a first means for causing said fluid to flow in said flow line under a first set of conditions; a second means for causing said fluid to flow in said flow line under a second set of conditions; means for measuring a first fluid pressure differential in said portion of flow line during fluid flow under said first set of conditions, and for measuring a second pressure differential in said flow line during fluid flow under said second set of conditions; and means for determining density and viscosity of said fluid as a function of said first and second measured pressure differentials. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification