Reservoir regions management with unstructured grid reservoir simuation model

Patent metadata

Field	Value
Publication number	US-2020226311-A1
Application number	US-202016737386-A
Country	US
Kind code	A1
Filing date	Jan 8, 2020
Priority date	Jan 16, 2019
Publication date	Jul 16, 2020
Grant date	—

Abstract

Reservoir management based on unstructured grid reservoir simulation is improved with machine learning based intelligent automation. Reservoir heterogeneity, geological internal boundary features and well geometry complexity are taken into account to automatically detect well zone and focusing reservoir area by calculating the region-of-interests in the model and defining cell spacing for grid coarsening and refinement in the reservoir. Data points for wells in the reservoir are grouped into reservoir regions according to datasets organized as a convex hull, which is a minimum convex set in spatial geometry which encloses the totality of such data points. The reservoir regions form a basis for grid spacing utilized in the reservoir model.

First claim

What is claimed is:

1 . A method of reservoir management of a subsurface hydrocarbon producing reservoir having a plurality of wells, comprising the steps of:
generating an unstructured grid model of the reservoir with actual well trajectory of at least one of the plurality of wells in the reservoir; performing reservoir simulation of production of fluids from the reservoir based on the generated unstructured grid model; performing reservoir management of the reservoir based on the results of the performed reservoir simulation of production of fluids.

2 . The method of claim 1 , wherein the step of generating an unstructured grid model of the reservoir comprises generating an unstructured grid model with actual well trajectory of at least one individual well of a plurality of wells of a subsurface reservoir during reservoir simulation by a reservoir simulator of a data processing system.

3 . The method of claim 2 , wherein the data processing system comprises a memory and a processor, and wherein the step of generating of the model is based on input data defining internal boundary geometry and internal boundary descriptions of the reservoir model provided the computer, and on well trajectory and completion data obtained for the at least one of the plurality of wells in the reservoir.

4 . The method of claim 3 , wherein the step of generating an unstructured grid model of the reservoir comprises the computer implemented steps of:
storing in the memory computer operable instructions causing the processor to generate the unstructured grid with actual well trajectory of the at least individual well during the reservoir simulation; performing in the processor under control of the stored computer operable instructions the steps of: receiving from the memory well perforation location coordinates of the at least one individual well in an unstructured grid model of the reservoir based on the well trajectory and completion data for the at least one individual well; forming a well dataset of well trajectory locations in the reservoir; determining the convex hull of the well dataset of well trajectory locations; transforming the convex hull into at least one reservoir region of the unstructured grid model of the subsurface reservoir.

5 . The method of claim 1 , wherein the step of generating an unstructured grid model of the reservoir comprises generating an unstructured grid model with actual well trajectories of a plurality of wells of a subsurface reservoir during reservoir simulation by a reservoir simulator of a data processing system.

6 . The method of claim 5 , wherein the data processing system computer comprises a memory and a processor and wherein the step of generating of the model is based on input data defining internal boundary geometry and internal boundary descriptions of the reservoir model provided the computer, and on well trajectory and completion data obtained for the plurality of wells in the reservoir.

7 . The method of claim 6 , wherein the step of generating an unstructured grid model of the reservoir comprises the computer implemented steps of:
storing in the memory computer operable instructions causing the processor to generate the unstructured grid with actual well trajectory of the plurality of wells during the reservoir simulation; performing in the processor under control of the stored computer operable instructions the steps of: receiving from the memory well perforation location coordinates of the plurality of wells in an unstructured grid model of the reservoir based on the well trajectory and completion data for the plurality of wells; forming a well dataset of well trajectory locations in the reservoir; determining the convex hull of the well dataset of well trajectory locations; transforming the convex hull into at least one reservoir region of the unstructured grid model of the subsurface reservoir.

8 . The method of claim 1 , wherein the step of performing reservoir management of the reservoir comprises adjusting production of fluids from the reservoir.

9 . The method of claim 1 , wherein the step of performing reservoir management of the reservoir comprises performing further development of the reservoir.

10 . The method of claim 6 , wherein the step of performing further development of the reservoir comprises drilling a production well in the reservoir.

11 . The method of claim 6 , wherein the step of performing further development of the reservoir comprises drilling an exploration well in the reservoir.

12 . A data processing system for generating an unstructured grid model of a subsurface hydrocarbon producing reservoir with actual well trajectory of at least one individual well of a plurality of wells of a subsurface reservoir during reservoir simulation, the generating of the model being based on input data defining internal boundary geometry and internal boundary descriptions of the reservoir model provided the data processing system, and on well trajectory and completion data for the plurality of wells in the reservoir obtained during drilling of the wells, the data processing system comprising:
a memory receiving and storing the provided input data defining internal boundary geometry and internal boundary descriptions of the reservoir model; the memory further storing computer operable instructions causing the data processing system to generate the unstructured grid model with actual well trajectory of the at least one individual well during the reservoir simulation; a processor generating the unstructured grid model with actual well trajectory of the at least one individual well of the reservoir by performing in the under control of the stored computer operable instructions the steps of:
receiving from the memory well perforation location coordinates of the at least one individual well in an unstructured grid model of the reservoir based on the well trajectory and completion data for the at least one individual well;
forming a well dataset of well trajectory locations of the at least one individual well in the reservoir;
determining the convex hull of the well dataset of well trajectory locations;
transforming the convex hull into at least one reservoir region of the unstructured grid model of the subsurface reservoir; and
a reservoir simulator performing the reservoir simulation of production of fluids from the reservoir based on the generated unstructured grid model.

13 . The data processing system of claim 9 , further including a user display forming an output display of the results of the reservoir simulation of production of fluids from the reservoir based on the generated unstructured grid model.

14 . The data processing system of claim 9 , wherein the processor further generates the unstructured grid model with actual well trajectory of the plurality of wells of the reservoir by performing the steps of:
receiving from the memory well perforation location coordinates of the plurality of wells in the unstructured grid model of the reservoir based on the well trajectory and completion data for the plurality of wells; forming a well dataset of well trajectory locations of the plurality of wells in the reservoir; determining the convex hull of the well dataset of well trajectory locations; transforming the convex hull into at least one reservoir region of the unstructured grid model of the subsurface reservoir.

15 . A computer implemented method of generating an unstructured grid model of a subsurface hydrocarbon producing reservoir with actual well trajectory of at least one individual well of a plurality of wells of a

Assignees

• Saudi Arabian Oil Co

Inventors

• Ding Xiang Yang

Classifications

• E21B2200/20

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

• E21B43/00 Primary

  Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (applicable only to water E03B) · CPC title

• G06F30/27 Primary

  using machine learning, e.g. artificial intelligence, neural networks, support vector machines [SVM] or training a model · CPC title

• G01V99/00

  Subject matter not provided for in other groups of this subclass · CPC title

• G06F2113/08

  Fluids · CPC title