Simulating Downhole Flow Through a Perforation

• US 20130031969A1
• Filed: 10/11/2012
• Published: 02/07/2013
• Est. Priority Date: 05/06/2010
• Status: Active Grant

• Current Assignee: Halliburton Energy Services Incorporated (Halliburton Company)
• Original Assignee: Halliburton Energy Services Incorporated (Halliburton Company)
• Inventors: Haggerty, Dennis, Brooks, James E.
• Granted Patent: US 9,057,802 B2
• Time in Patent Office: Days
• US Class Current: 73/152.07
• CPC Class Codes: E21B 43/11 Perforators; Permeators
• CPC Class Codes: E21B 49/02 by mechanically taking samples of the soil
• CPC Class Codes: G01V 11/002 Details, e.g. power supply systems for logging instruments, transmitting or recording data, specially adapted for well logging, also if the prospecting method is irrelevant means for transmitting well survey signals E21B47/12; signal transmission systems in general G08C; transmission in general H04B

Abstract

A method of testing a core sample is provided. The method comprises determining an impedance map, attaching a sleeve to the core sample, and measuring a flow performance of the core sample. An impedance of each of a plurality of portions of the sleeve is based on the impedance map.

Claims

1. A perforation test target, comprising:

a metal plate;

a core sample adhered to the metal plate at one end; and

a first sleeve adhered to the core sample, wherein a flow impedance of each of a plurality of portions of the first sleeve is based on a predetermined impedance map.

2. The perforation test target of claim 1, wherein the first sleeve comprises layers of filter paper, wherein the number of layers at each portion of the first sleeve corresponds to the flow impedance at that portion.

3. The perforation test target of claim 1, wherein the first sleeve comprises a ceramic material, wherein the geometry of the first sleeve is based on the predetermined impedance map.

4. The perforation test target of claim 1, further comprising a second sleeve positioned over the first sleeve, wherein a compliance of the second sleeve varies along a circumference of the core sample.

5. The perforation test target of claim 1, wherein the perforation test target further comprises a cap adhered to an end of the core sample opposite the metal plate, wherein the cap has a flow impedance based at least on one of a formation parameter, a perforation parameter, a wellbore parameter, and a core sample parameter.

6. The perforation test target of claim 1, wherein the first sleeve comprises a fine particle material.

7. The perforation test target of claim 1, wherein the core sample comprises an elliptical cross section.

8. The perforation test target of claim 7, wherein a ratio of a major radius of the core sample to a minor radius of the core sample is between about 1.1 and about 2.

9. The perforation test target of claim 7, wherein the flow impedance of the first sleeve varies only in an axial direction.

10. The perforation test target of claim 1, wherein the first sleeve is adhered to the core sample using attaching hardware.

11. The perforation test target of claim 1, wherein the first sleeve is adhered to the core sample using a support sleeve.

12. The perforation test target of claim 1, wherein the flow impedance of the plurality of portions varies only in the axial direction.

13. The perforation test target of claim 1, wherein the flow impedance of the plurality of portions varies in both the axial and radial directions.

14. The perforation test target of claim 1, wherein the first sleeve comprises a sheet rolled about the core sample.

15. A perforation test target, comprising:

a metal plate;

a core sample adhered to the metal plate at one end; and

a first sleeve adhered to the core sample, wherein the first sleeve is configured to transform a constant surface fluid pressure incident on an outside of the first sleeve to a non-constant fluid pressure distribution on a surface of the core sample when fluid is flowing.

16. The perforation test target of claim 15, further comprising a cap portion engaging an end of the core sample opposite the metal plate, wherein a flow impedance of the cap portion varies from a center of the cap portion to an edge of the cap portion.

17. The perforation test target of claim 15, wherein an impedance of the first sleeve varies only in the axial direction.

18. The perforation test target of claim 15, wherein the first sleeve comprises a sheet rolled about the core sample.

19. The perforation test target of claim 18, wherein a ratio of a major radius of the core sample to a minor radius of the core sample is between about 1.1 and about 2.

20. The perforation test target of claim 18, wherein a flow impedance of the first sleeve varies only in an axial direction.