IP Library › Granted Patent US 12,547,945
Granted Patent B2
US 12,547,945 · App. 17/696,443 · Granted Feb 10, 2026

Dew point pressure prediction using isothermal constant composition expansion and artificial intelligence

Inventors: Uchenna Odi (Houston, TX); Anuj Gupta (Houston, TX)
Assignee: Saudi Arabian Oil Company
G06N20/10E21B41/00G06F30/27
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Quick Facts
Patent No.
US 12,547,945
App. No.
17/696,443
Granted
Feb 10, 2026
Kind
B2
Abstract

A computer-implemented method that enables dew point pressure prediction using isothermal constant composition expansion and artificial intelligence is described herein. The method includes obtaining constant composition expansion data of a reservoir fluid, and predicting saturation pressures for the reservoir fluid at the constant composition expansion data points using a trained machine learning model selected from multiple machine learning models that are trained using data from a generated constant composition expansion library. The method also includes determining a central tendency of the predicted saturation pressures to obtain a final saturation pressure corresponding to the constant composition expansion data for the reservoir fluid. In examples, the final saturation pressure is a dew point pressure of the reservoir fluid

Claims (32)

1 . A computer-implemented method, comprising:

obtaining, with one or more hardware processors, constant composition expansion data points corresponding to a reservoir fluid;

predicting, with the one or more hardware processors, saturation pressures for the reservoir fluid at the constant composition expansion data points using a trained machine learning model selected from multiple machine learning models that are trained using data from a generated constant composition expansion library; and

determining, with the one or more hardware processors, a central tendency of the predicted saturation pressures to obtain a final saturation pressure for the reservoir fluid.

2 . The computer implemented method of claim 1 , wherein the constant composition expansion data comprises a total compressibility and a liquid density of the reservoir fluid at multiple pressures.

3 . The computer implemented method of claim 1 , wherein the constant composition expansion library comprises experimentally derived constant composition expansion data and synthetic constant composition expansion data.

4 . The computer implemented method of claim 1 , wherein the trained machine learning model selected to predict the saturations pressures has a best validation and cross validation root mean square error of the multiple machine learning models that are trained.

5 . The computer implemented method of claim 1 , wherein the trained machine learning model is a Nystroem Kernel Support Vector Machine Regressor.

6 . The computer implemented method of claim 1 , wherein the saturation pressures are dew point pressures, and the reservoir fluid is wet gas condensate.

7 . The computer implemented method of claim 1 , wherein the saturation pressures are bubble point pressures, and the reservoir fluid is black oil.

8 . An apparatus comprising a non-transitory, computer readable, storage medium that stores instructions that, when executed by at least one processor, cause the at least one processor to perform operations comprising:

obtaining constant composition expansion data points corresponding to a reservoir fluid;

predicting saturation pressures for the reservoir fluid at the constant composition expansion data points using a trained machine learning model selected from multiple machine learning models that are trained using data from a generated constant composition expansion library; and

determining a central tendency of the predicted saturation pressures to obtain a final saturation pressure for the reservoir fluid.

9 . The apparatus of claim 8 , wherein the constant composition expansion data comprises a total compressibility and a liquid density of the reservoir fluid at multiple pressures.

10 . The apparatus of claim 8 , wherein the constant composition expansion library comprises experimentally derived constant composition expansion data and synthetic constant composition expansion data.

11 . The apparatus of claim 8 , wherein the trained machine learning model selected to predict the saturations pressures has a best validation and cross validation root mean square error of the multiple machine learning models that are trained.

12 . The apparatus of claim 8 , wherein the trained machine learning model is a Nystroem Kernel Support Vector Machine Regressor.

13 . The apparatus of claim 8 , wherein the saturation pressures are dew point pressures, and the reservoir fluid is wet gas condensate.

14 . The apparatus of claim 8 , wherein the saturation pressures are bubble point pressures, and the reservoir fluid is black oil.

15 . A system, comprising:

one or more memory modules;

one or more hardware processors communicably coupled to the one or more memory modules, the one or more hardware processors configured to execute instructions stored on the one or more memory models to perform operations comprising:

obtaining constant composition expansion data points corresponding to a reservoir fluid;

predicting saturation pressures for the reservoir fluid at the constant composition expansion data points using a trained machine learning model selected from multiple machine learning models that are trained using data from a generated constant composition expansion library; and

determining a central tendency of the predicted saturation pressures to obtain a final saturation pressure for the reservoir fluid.

16 . The system of claim 15 , wherein the constant composition expansion data points comprises a total compressibility and a liquid density of the reservoir fluid at multiple pressures.

17 . The system of claim 15 , wherein the constant composition expansion library comprises experimentally derived constant composition expansion data and synthetic constant composition expansion data.

18 . The system of claim 15 , wherein the trained machine learning model selected to predict the saturations pressures has a best validation and cross validation root mean square error of the multiple machine learning models that are trained.

19 . The system of claim 15 , wherein the trained machine learning model is a Nystroem Kernel Support Vector Machine Regressor.

20 . The system of claim 15 , wherein the saturation pressures are dew point pressures, and the reservoir fluid is wet gas condensate.

21 . The system of claim 15 , wherein the saturation pressures are bubble point pressures, and the reservoir fluid is black oil.

Assignments (3)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 1, 2022
From: ARAMCO SERVICES COMPANY
To: SAUDI ARAMCO UPSTREAM TECHNOLOGY COMPANY
Reel/Frame 060065/0727 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 1, 2022
From: SAUDI ARAMCO UPSTREAM TECHNOLOGY COMPANY
To: SAUDI ARABIAN OIL COMPANY
Reel/Frame 060065/0776 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 22, 2022
From: ODI, UCHENNA; GUPTA, ANUJ
To: ARAMCO SERVICES COMPANY
Reel/Frame 059340/0972 →
Continuity (1)
Related Publication 20230297893A1 · Sep 21, 2023
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