Automatic optimizing methods for reservoir testing

Patent metadata

Field	Value
Publication number	US-9945224-B2
Application number	US-201213876113-A
Country	US
Kind code	B2
Filing date	Jul 24, 2012
Priority date	Jul 25, 2011
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A method of determining a reservoir parameter of a subterranean formation comprising: initiating an initial pressure pulse in the subterranean formation; initiating a series of subsequent pressure pulses in the subterranean formation until the reservoir parameter may be determined, wherein each subsequent pressure pulse is optimized utilizing analytical and/or numerical simulation models; and determining the reservoir parameter.

First claim

What is claimed is:

1. A method of determining a reservoir parameter of a subterranean formation comprising:
initiating an initial pressure pulse in the subterranean formation, wherein the initial pressure pulse comprises an initial drawdown pulse, an initial buildup time, an initial injection pulse and an initial buildown time;
determining an initial drawdown pressure by subtracting from an initial reservoir pressure a product of a pressure conversion factor and a first dimensionless pressure response, wherein the first dimensionless pressure response is a first flow model determined by a drawdown test duration, a source radius, a borehole storage coefficient and a skin factor;
determining an initial buildup pressure by adding the initial drawdown pressure to a product of the pressure conversion factor and a second dimensionless pressure response, wherein the second dimensionless pressure response is a second flow model determined by a build up test duration, the source radius, the borehole storage coefficient and the skin factor;
determining an initial injection pressure by adding to the initial buildup pressure a product of the pressure conversion factor and a third dimensionless pressure response, wherein the third dimensionless pressure response is a third flow model determined by an injection test duration, the source radius, the borehole storage coefficient and the skin factor;
determining a builddown pressure by subtracting from the initial injection pressure a product of the pressure conversion factor and a fourth dimensionless pressure response, wherein the fourth dimensionless pressure response is a fourth flow model determined by a builddown test duration, the source radius, the borehole storage coefficient and the skin factor;
initiating a first series of subsequent pressure pulses in the subterranean formation, wherein the first series of subsequent pressure pulses comprises at least a first drawdown pulse, a first buildup time, a first injection pulse and a first buildown time, wherein each of the first series of subsequent pressure pulses is optimized utilizing an analytical simulation model, and wherein the analytical simulation model comprises a system pressure response at a time per pressure pulse superposed with one or more previous pressure pulses;
record a shut-in pressure during a no flow period;
initiating a second series of pressure pulses in the subterranean formation based on the shut-in pressure, wherein the second series of pressure pulses comprises at least a second drawdown pulse, a second buildup time, a second injection pulse and a second buildown time, wherein each of the second series of pressure pulses is optimized utilizing the analytical simulation model; and
determining the reservoir parameter.

2. The method of claim 1 , wherein each subsequent pressure pulse is optimized utilizing a genetic evolutionary optimization method.

3. The method of claim 1 , wherein the reservoir parameter comprises at least one reservoir parameter selected from the group consisting of stabilized pressure, actual formation pressure, formation mobility, fluid compressibility, a mudcake property and formation damage.

4. The method of claim 1 , wherein each pressure pulse is followed by a stabilization period.

5. The method of claim 4 , further comprising measuring the pressure of the subterranean formation during the stabilization period.

6. The method of claim 5 , wherein the measured pressure of the subterranean formation during the stabilization period is used to determine the subsequent pressure pulse.

7. The method of claim 6 , wherein each subsequent pressure pulse moves the measured pressure of the subterranean formation during the stabilization period closer to a stabilized pressure than the previous pressure pulse.

8. The method of claim 1 , wherein the initial pressure pulse continues to be generated until a desired pressure, pressure transient, or volume is obtained.

9. The method of claim 1 , wherein the initial pressure pulse is varied until a desired pressure is obtained.

10. A method of determining a reservoir parameter of a subterranean formation comprising:
initiating an initial pressure pulse in the subterranean formation, wherein the initial pressure pulse comprises an initial drawdown pulse, an initial buildup time, an initial injection pulse and an initial buildown time;
determining an initial drawdown pressure by subtracting from an initial reservoir pressure a product of a pressure conversion factor and a first dimensionless pressure response, wherein the first dimensionless pressure response is a first flow model determined by a drawdown test duration, a source radius, a borehole storage coefficient and a skin factor;
determining an initial buildup pressure by adding the initial drawdown pressure to a product of the pressure conversion factor and a second dimensionless pressure response, wherein the second dimensionless pressure response is a second flow model determined by a build up test duration, the source radius, the borehole storage coefficient and the skin factor;
determining an initial injection pressure by adding to the initial buildup pressure a product of the pressure conversion factor and a third dimensionless pressure response, wherein the third dimensionless pressure response is a third flow model determined by an injection test duration, the source radius, the borehole storage coefficient and the skin factor;
determining a builddown pressure by subtracting from the initial injection pressure a product of the pressure conversion factor and a fourth dimensionless pressure response, wherein the fourth dimensionless pressure response is a fourth flow model determined by a builddown test duration, the source radius, the borehole storage coefficient and the skin factor;
initiating a first series of pressure pulses in the subterranean formation, wherein the first series of pressure pulses comprises at least a first drawdown pulse, a first buildup time, a first injection pulse and a first buildown time, wherein the first drawdown pulse time and the first buildup time of each of the first series of pressure pulses is optimized utilizing an analytical simulation model, and wherein the analytical simulation model comprises a system pressure response at a time per pressure pulse superposed with one or more previous pressure pulses;
record a shut-in pressure during a no flow period;
initiating a second series of pressure pulses in the subterranean formation based on the shut-in pressure, wherein the second series of pressure pulses comprises at least a second drawdown pulse, a second buildup time, a second injection pulse and a second buildown time, wherein each of the second series of pressure pulses is optimized utilizing the analytical simulation model; and
determining the reservoir parameter.

11. The method of claim 10 , wherein the drawdown pulse time and the buildup time of each subsequent pressure pulse is optimized utilizing a genetic evolutionary optimization method.

12. The method of claim 10 , wherein a drawdown pulse time of each subsequent pressure pulse is in the range of from 10 seconds to 120 seconds.

13. The method of claim 10 , wherein the subsequent buildup time of each subsequent pressure pulse is in the range of from 30 seconds to 120.

14. The method of claim 10 , wherein the initial pressure pulse and the subsequent pressure pulses are initiated using a straddle-packer formation tester, a standard probe, or an oval probe.

15. A method of determining a reservoir parameter of a subterranean formation with an initial pressure comprising:
(a) initiating

Assignees

• Proett Mark
• Chen Dingding
• Hadibeik Abdolhamid
• Eyuboglu Sami Abbas
• Halliburton Energy Services Inc

Inventors

• Proett Mark
• Chen Dingding
• Hadibeik Abdolhamid
• Eyuboglu Sami Abbas

Classifications

• E21B49/087

  Well testing, e.g. testing for reservoir productivity or formation parameters · CPC title

• E21B47/06 Primary

  Measuring temperature or pressure · CPC title

• E21B49/0875 Primary

  determining specific fluid parameters · CPC title