Borehole tool, procedures, and interpretation for making permeability measurements of subsurface formations
First Claim
1. A borehole tool for use in an uncased borehole in a formation, comprising:
- a) a source probe means for making fluid contact with a wall of said borehole;
b) a fluid flow line for bringing fluids to said source probe;
c) at least one injection fluid chamber containing one of clean oil and clean water, with said injection fluid chamber being in fluid communication with said fluid flow line;
d) pressure measurement means for measuring pressure resulting from the injection of said one of clear oil and clean water through said source probe means and into said formation; and
e) cleaning means for cleaning said source probe means and at least a portion of said fluid flow line prior to the injection of said one of clean oil and clean water into said formation.
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Accused Products
Abstract
A borehole tool has a source probe in fluid contact with the borehole wall, a fluid flow line for bringing fluids to and from the source probe, two injection fluid chambers containing clean oil and clean water and in fluid contact with the fluid flow line, at least one sample chamber for receiving fluid from the formation, valves for selectively routing the formation fluids and the clean oil and water through the fluid flow line, at least one pressure controller for controlling whether fluid is to be injected or withdrawn from the formation via the source probe, and a pressure gauge for measuring the pressure seen at the source probe. Permeability measurements are made by sequentially injecting one clean fluid into the formation, followed by a cleaning of the line with the other fluid which was not injected, followed by the injection of the other fluid into the formation. The order in which the oil and water are injected is based on the type of mud used for drilling. Using the sequential injection preceded and separated by cleaning, end point effective and relative permeability determinations are made by measuring the pressure seen at the probe during steady-state injection conditions of known flow rate in order to calculate mobility of the fluid phase being injected; the mobility being related to the end point effective permeability via the viscosity of the liquid being injected.
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Citations
32 Claims
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1. A borehole tool for use in an uncased borehole in a formation, comprising:
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a) a source probe means for making fluid contact with a wall of said borehole; b) a fluid flow line for bringing fluids to said source probe; c) at least one injection fluid chamber containing one of clean oil and clean water, with said injection fluid chamber being in fluid communication with said fluid flow line; d) pressure measurement means for measuring pressure resulting from the injection of said one of clear oil and clean water through said source probe means and into said formation; and e) cleaning means for cleaning said source probe means and at least a portion of said fluid flow line prior to the injection of said one of clean oil and clean water into said formation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 30, 31, 32)
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19. A method for making permeability measurements of a formation with a borehole tool, said borehole tool having a source probe which is in fluid contact with a wall of said borehole, a fluid flow line for bringing fluids to said source probe, at least two injection fluid chambers containing respectively clean oil and clean water, with said injection fluid chambers being in fluid contact with said fluid flow line, a plurality of valves for selectively routing said clean oil and clean water through said fluid flow line, and a pressure measurement means for measuring pressure resulting from the injection of said clean oil and the injection of said clean water into said formation, said method comprising:
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a) injecting a first of said clean oil and the clean water into said formation, and measuring resulting pressure at said pressure measurement means; b) cleaning said flow line with the other of said clean oil and said clean water; c) injecting said other of said clean oil and said clean water into said formation, and measuring resulting pressure at said pressure measurement means. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification