Coreless injectivity testing method
AssigneeSaskatchewan Research Council
InventorsPetro NAKUTNYY, Peng LUO, Kelvin Dean KNORR, Michael John CRABTREE
Life of this patent
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Abstract
A coreless injectivity method. Drill cuttings from drilling a well into a subterranean formation rock are pressed into a compressed core plug and the compressed core plug subjected to injectivity testing. The injectivity testing of the compressed core plug is representative of the injectivity of the subterranean formation, so the injectivity of the subterranean formation can be determined. The compressed core plug can also be used to conduct relative permeabilities and displacement studies similar to the actual reservoir core plugs.
Claims36
A method for assessing a siliciclastic subterranean formation rock petrophysical property, comprising:
- providing drill cuttings from the siliciclastic subterranean formation;
- cleaning the drill cuttings;
- forming a compressed core plug from the drill cuttings;
- installing the compressed core plug into a coreholder;
- and
- injecting a test fluid into the compressed core plug in order to assess a compressed core plug petrophysical property,
- wherein the compressed core plug petrophysical property represents the corresponding siliciclastic subterranean formation rock petrophysical property, prior to injecting the test fluid into the compressed core plug.
A method for assessing a petrophysical property of a siliciclastic subterranean formation rock having a clay content of about 5 wt. percent or more, comprising:
- providing drill cuttings from the siliciclastic subterranean formation;
- cleaning the drill cuttings:
- a) with KCl if the drill cuttings include water-based drilling fluid;
- or
- b) with a solvent if the drill cuttings include oil-based drilling fluid;
- drying the drill cuttings;
- packing the drill cuttings with a packing fluid, preferably toluene;
- forming a compressed core plug from the drill cuttings by placing a quantity of the drill cuttings into a form and applying a pressure to compress the drill cuttings to form the compressed core plug;
- drying the compressed core plug;
- and
- installing the compressed core plug into a coreholder;
- injecting a test fluid into the compressed core plug while measuring an injected volume and a differential pressure,
- wherein the injectivity of the test fluid into the compressed core plug is representative of the injectivity of the test fluid into the siliciclastic subterranean formation rock.
A method of forming a compressed core plug for assessing a siliciclastic subterranean formation rock petrophysical property, comprising:
- providing drill cuttings from the siliciclastic subterranean formation;
- cleaning the drill cuttings:
- a) with a KCl solution if the drill cuttings include water-based drilling fluid;
- or
- b) with a solvent if the drill cuttings include oil-based drilling fluid;
- drying the drill cuttings;
- packing the drill cuttings with a packing fluid, preferably toluene;
- forming the compressed core plug from the drill cuttings by placing a quantity of the drill cuttings into a form and applying a pressure to compress the drill cuttings to form the compressed core plug;
- and
- drying the compressed core plug,
- wherein the compressed core plug is adapted to undergo core flooding evaluation.
Dependencies are inferred from the claim text.