Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1992-10-30
1994-08-16
Williams, Hezron E.
Measuring and testing
With fluid pressure
Porosity or permeability
G01N 1508
Patent
active
053375963
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an apparatus for measuring permeability in rock samples comprising a measuring table for strapping down a rock sample, a nozzle that can be pressed against the rock sample at a set force, a gas source connected to the nozzle, devices for measuring mass flow through the nozzle and pressure in the nozzle.
BACKGROUND ART
It is a well-known fact that measuring the conductivity and porosity of a formation is important when determining whether the formation contains hydrocarbons, as hydrocarbons are found as non-conductive fluids in porous rock formations. It is also a well-known fact that hydrocarbons usually cannot be recovered from porous rock formations unless the formations also are permeable. It is therefore important to have reliable measurements of the formations permeability. These measurements are best taken in an apparatus in a laboratory.
Known apparatuses of the type mentioned above are operated manually. This makes the measuring cumbersome and expensive.
DISCLOSURE OF INVENTION
It is an object of the invention to provide an apparatus that can make these measurements automatically.
This has been achieved according to the invention with an apparatus that is characterised by a rack equipped with a pneumatic cylinder to which the nozzle is attached and where the rack and measuring table are movable in relation to each other along the X and Y axes via motors and a computer that controls: table relatively to each other that the sample is covered by a predetermined measuring point pattern. cylinder, and thereby the vertical movement of the nozzle
BRIEF DESCRIPTION OF DRAWINGS
The invention will be described in further detail below with reference to the enclosed figures where:
FIG. 1 shows a drawing of the apparatus according to the invention.
FIG. 2 shows a drawing of an alternative construction of the apparatus according to the invention.
FIG. 3 shows a schematic drawing of the apparatus.
MODES FOR CARRYING OUT THE INVENTION
FIG. 1 shows a measuring table 1 which is provided for clamping one or several rock samples 2 where permeability is to be measured. The shown measuring table 1 is placed on a support structure 3 and comprises a bottom frame 4 which is rigidly connected to the support structure and comprises a first driving motor 5, an intermediate frame 6 which comprises a second driving motor 7 and is mounted so it can be moved along a Y axis in relation to the bottom frame , and an upper frame 8 which is movable along an X axis in relation to the intermediate frame 6.
The driving motor 5 of the bottom frame 4 works a positioning screw (not shown) oriented in the Y direction which runs through at least one threaded bushing on the intermediate frame 6. The intermediate frame 6 is mounted in a sliding position in relation to the bottom frame via grooves or guide bars that slide the intermediate frame in the Y direction upon rotation of the positioning screw.
The driving motor 7 of the intermediate frame 6 comprises a positioning screw (not shown) oriented along the X axis and which on its other side is pivotally mounted in a revolving position in a bushing 9. The positioning screw runs through at least one threaded bushing which is connected to the upper frame 8. The upper frame 8 is mounted in a sliding position in relation to the intermediate frame via grooves or guide bars that slide the upper frame in the X direction upon rotation of the positioning screw.
The top of the upper frame 8 is designed approximately level and arranged to receive the above-mentioned rock samples. In the trade it is usual for the rock samples 2 to be glued to wooden boards of standard size. The wooden boards can be secured to the upper frame, basically using known mechanical fastening devices.
For our purpose electrical driving motors that are commercially available are preferred. They should enable movement of the frames with a high degree of positioning accuracy. The motors can be controlled on the basis of logical signals which, according to this invention, come fro
REFERENCES:
patent: 4573342 (1986-03-01), Jones
patent: 4864845 (1989-09-01), Chandler et al.
patent: 5237854 (1993-08-01), Jones
Halvorsen, Jr. Christian
Hurst Andrew R.
Den Norske Stats Oljeselskap A.S
Roskos Joseph W.
Williams Hezron E.
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