Multiple function dual core flooding apparatus and methods

Patent metadata

Field	Value
Publication number	US-10976296-B2
Application number	US-201916567472-A
Country	US
Kind code	B2
Filing date	Sep 11, 2019
Priority date	Aug 9, 2016
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

A dual core flooding apparatus and process are disclosed that provide for testing of two core plugs using different orientations and multiple fluids. The dual core flooding apparatus includes at least two core holders each configured to contain a core plug. The dual core flooding apparatus includes a fluids delivery system configured to inject one or more fluids into the core holders and core plugs. The dual core flooding apparatus includes an image capture system, a density and viscosity measurement system, and at least two oil/water separators. The dual core flooding apparatus also includes at least two back pressure regulators and an automated confining pressure system. A dual core flooding process may include introducing at least one fluid into the core holders, maintaining confining pressure and back pressure, and measuring density and viscosity of existing fluids.

First claim

What is claimed is:

1. A method for dual core flooding of a plurality of core plugs, comprising the steps of:
introducing, by a fluids delivery system, one or more fluids into a first core holder and a second core holder, the first core holder being operable to contain a first core plug and the second core holder being operable to contain a second core plug;
separating, by a separator, hydrocarbon fluid from the one or more fluids, the separator in fluid communication with an outlet port of the first core holder or an outlet port of the second core holder;
maintaining, by a pressure confining system, a first confining pressure in the first core holder and a second confining pressure in the second core holder;
maintaining, by a back pressure control system a first pore pressure within the first core plug independent of a second pore pressure within the second core plug;
measuring, by a density meter coupled to the outlet port of the first core holder and the outlet port of the second core holder, density of the one or more fluids exiting from the outlet port of the first core holder or the outlet port of the second core holder;
measuring, by viscosity meter coupled to the outlet port of the first core holder and the outlet port of the second core holder, a viscosity of the one or more fluids exiting from the outlet port of the first core holder and the outlet port of the second core holder; and
acquiring, by a data acquisition system, properties of the one or more fluids exiting from the outlet port of the first core holder or the outlet port of the second core holder.

2. The method of claim 1 , wherein the one or more fluids comprise a first fluid and a second fluid, wherein introducing, by a fluids delivery system, one or more fluids into a first core holder and a second core holder comprises:
introducing the first fluid into the first core holder; and
introducing the second fluid into the second core holder.

3. The method of claim 2 , wherein the fluids delivery system comprises a plurality of valves, wherein introducing the first fluid into the first core holder comprises opening a first group of the plurality of valves and closing a second group of the plurality of valves to define a first fluid flow path from a first fluid accumulator of the fluids delivery system to the inlet port of the first core holder and a second fluid path from a second fluid accumulator of the fluids delivery system to the inlet port of the second core holder.

4. The method of claim 2 , wherein the one or more fluids comprise a third fluid, wherein introducing, by a fluids delivery system, one or more fluids into a first core holder and a second core holder comprises:
introducing the third fluid into the first core holder after introducing the first fluid into the first core holder.

5. The method of claim 1 , wherein the one or more fluids comprise a single fluid, wherein introducing, by a fluids delivery system, one or more fluids into a first core holder and a second core holder comprises introducing the single fluid into the first core holder and the second holder.

6. The method of claim 5 , wherein the fluids delivery system comprises a plurality of valves, wherein introducing the single fluid into the first core holder and the second core holder comprises opening a first group of the plurality of valves and closing a second group of the plurality of valves to define a first fluid flow path from a first fluid accumulator of the fluids delivery system to the inlet port of the first core holder and a second fluid flow path from the first fluid accumulator of the fluids delivery system to the inlet port of the second core holder.

7. The method of claim 1 , comprising introducing, via the fluids delivery system, a foam slug into the first core holder.

8. The method of claim 1 , wherein the one or more fluids comprise live crude oil, dead crude oil, seawater or carbon dioxide.

9. The method of claim 1 , wherein the properties comprise one of a density, a viscosity, an amount of hydrocarbon fluid, and an amount of water.

Assignees

• Saudi Arabian Oil Co

Inventors

• Al-Otaibi Fawaz
• Zhou Xianmin
• Eidan Ahmed A
• Kokal Sunil
• Alhashboul Almohannad A

Classifications

• E21B25/00

  Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors (core bits E21B10/02) · CPC title

• G01N9/32

  by using flow properties of fluids, e.g. flow through tubes or apertures · CPC title

• G01N15/082

  Investigating permeability by forcing a fluid through a sample · CPC title

• G01N33/24 Primary

  Earth materials (G01N33/42 takes precedence) · CPC title

• G01N15/0826

  and measuring fluid flow rate, i.e. permeation rate or pressure change · CPC title