Workflow to model and condition water distribution in a hydrocarbon reservoir

Patent metadata

Field	Value
Publication number	US-11905807-B2
Application number	US-202117363706-A
Country	US
Kind code	B2
Filing date	Jun 30, 2021
Priority date	Jun 30, 2021
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

A method includes determining a free water level in the reservoir, analyzing a free water pressure trend of the free water phase, determining a presence of anomalous pressures and salinities within the free water phase, determining whether gas down to models and water up to models fit the reservoir, determining a bi-modal pore throat distribution of the plurality of pores within the reservoir, and generating a difference map to model the water distribution in the reservoir.

First claim

What is claimed:

1. A method for modeling water distribution in a reservoir having a gas phase, a free water phase, and a plurality of pores, the method comprising:
determining a free water level in the reservoir;
analyzing a free water pressure trend of the free water phase;
determining a presence of anomalous pressures and salinities within the free water phase;
determining whether gas down to models and water up to models fit the reservoir;
determining a bi-modal pore throat distribution of the plurality of pores within the reservoir;
generating a difference map to model the water distribution in the reservoir;
determining a top pay zone of the reservoir using the difference map, wherein the top pay zone is a portion of the reservoir where the gas phase is located; and
drilling a well into the top pay zone of the reservoir to produce gas using the well.

2. The method of claim 1 ,
wherein the difference map models the top pay zone for a complex capillary pressure effect in a complex hydrodynamic dipping surface.

3. The method of claim 1 ,
wherein the difference map models the top pay zone for a single capillary pressure effect in a complex hydrodynamic dipping surface.

4. The method of claim 1 ,
wherein the free water pressure trend is analyzed by comparing the free water pressure trend to a reservoir pressure trend.

5. The method of claim 4 ,
wherein the free water pressure trend is analyzed by comparing the free water pressure trend to a pro-graditional pattern.

6. The method of claim 5 ,
wherein the free water pressure trend is analyzed by comparing the free water pressure trend to a hydrostatic pressure trend.

7. The method of claim 6 , further comprising:
determining an age of the free water phase.

8. The method of claim 7 , further comprising:
determining whether the age of the free water phase is dated to a most recent extensive diagenetic process.

9. The method of claim 8 , further comprising:
determining if a gas water contact shows a dipping trend wherein the gas water contact is a location in the reservoir located where the free water phase meets the gas phase.

10. The method of claim 9 , further comprising:
creating an adjusted inclined gas water contact to fit the gas down to models and the water up to models.

11. A non-transitory computer readable medium storing instructions for modeling water distribution in a reservoir having a gas phase, a free water phase, and a plurality of pores executable by a computer processor, the instructions comprising functionality for:
determining a free water level in the reservoir;
analyzing a free water pressure trend of the free water phase;
determining a presence of anomalous pressures and salinities within the free water phase;
determining whether gas down to models and water up to models fit the reservoir;
determining a bi-modal pore throat distribution of the plurality of pores within the reservoir;
generating a difference map to model the water distribution in the reservoir.

12. The non-transitory computer readable medium of claim 11 ,
wherein the free water pressure trend is analyzed by comparing the free water pressure trend to a reservoir pressure trend.

13. The non-transitory computer readable medium of claim 12 ,
wherein the free water pressure trend is analyzed by comparing the free water pressure trend to a pro-graditional pattern.

14. The non-transitory computer readable medium of claim 13 ,
wherein the free water pressure trend is analyzed by comparing the free water pressure trend to a hydrostatic pressure trend.

15. The non-transitory computer readable medium of claim 14 , wherein the instructions further comprise functionality for:
determining an age of the free water phase.

16. The non-transitory computer readable medium of claim 15 , wherein the instructions further comprise functionality for:
determining whether the age of the free water phase is dated to a most recent extensive diagenetic process.

17. The non-transitory computer readable medium of claim 16 , wherein the instructions further comprise functionality for:
determining if a gas water contact shows a dipping trend wherein the gas water contact is a location in the reservoir located where the free water phase meets the gas phase.

18. The non-transitory computer readable medium of claim 17 , wherein the instructions further comprise functionality for:
creating an adjusted inclined gas water contact to fit the gas down to models and the water up to models.

19. The non-transitory computer readable medium of claim 18 ,
wherein the difference map models a top pay zone for a complex capillary pressure effect in a complex hydrodynamic dipping surface.

20. The non-transitory computer readable medium of claim 18 ,
wherein the difference map models a top pay zone for a single capillary pressure effect in a complex hydrodynamic dipping surface.

Assignees

• Saudi Arabian Oil Co

Inventors

• Kassem Ahmed Moustafa Abdel Wahab M
• Alghamdi Nawaf Abdulrahman A
• Badghaish Badr Saeed

Classifications

• E21B43/20 Primary

  Displacing by water · CPC title

• E21B43/267

  reinforcing fractures by propping · CPC title

• G01V9/02

  Determining existence or flow of underground water · CPC title

• E21B49/00 Primary

  Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells · CPC title

• E21B2200/20

  Computer models or simulations, e.g. for reservoirs under production, drill bits · CPC title