System and method for performing microseismic fracture operations

Patent metadata

Field	Value
Publication number	US-9715026-B2
Application number	US-201214004612-A
Country	US
Kind code	B2
Filing date	Mar 12, 2012
Priority date	Mar 11, 2011
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A system and method of performing a microseismic fracture operation for a wellsite having a subterranean formation with a complex fracture network therein are provided. The method involves describing a relationship between microseismic events to determine the complex fracture network of the subterranean formation, generating a fault volume by extracting faults from the fracture network based on the relationship between the microseismic events, generating a discrete fracture network comprising discrete fractures from the complex fracture network by extracting fracture planes from the obtained fault volume, and simulating fracture geometry and proppant placement.

First claim

What is claimed is:

1. A method of performing a microseismic fracture operation for a wellsite having a subterranean formation with a complex fracture network therein, comprising:
performing the microseismic fracture operation with a fracture unit;
obtaining oilfield data from the microseismic fracture operation, the oilfield data comprising a plurality of microseismic events;
describing a relationship between microseismic events of the complex fracture network of the subterranean formation;
generating a fault volume by extracting faults from the fracture network based on the relationship between the microseismic events;
generating a discrete fracture network comprising discrete fractures from the complex fracture network by extracting fracture planes from the obtained fault volume;
determining fracture attributes of the discrete fractures of the fracture planes; and
determining fracture permeability from a correlation between dynamic wellsite parameters and the fracture attributes.

2. The method of claim 1 , further comprising performing microseismic quality control on the obtained oilfield data.

3. The method of claim 1 , wherein the describing is based on a function of a distance between events and a time of occurrence.

4. The method of claim 1 , wherein the describing is based on microseismic event attributes.

5. The method of claim 4 , wherein the describing comprises converting microseismic points, creating a three-dimensional grid with the converted microseismic points, upscaling the fracture attributes by resampling the microseismic event attributes in the three-dimensional grid, distributing properties of the microseismic event attributes, and converting a seismic volume to a seismic cube.

6. The method of claim 1 , wherein the generating a fault volume comprises performing Ant-tracking.

7. The method of claim 6 , wherein the Ant-tracking is performed using parameter settings comprising an initial ant boundary, an ant tract deviation, an ant step size, illegal steps allowed, legal steps, and stop criteria percentage.

8. The method of claim 6 , further comprising filtering the generated fault volume using an orientation filter.

9. The method of claim 1 , wherein the determining fracture attributes comprises generating a three dimensional grid around a well of the discrete fracture network and populating geomechanical properties throughout the grid based on horizontal stress, Young's modulus and Poisson's ratio.

10. The method of claim 1 , wherein the fracture attributes comprise fracture volume and injected volume, the method further comprising comparing the fracture volume to the injected volume.

11. The method of claim 1 , wherein the determining the fracture attributes comprises estimating propped fracture width based on a porosity of the proppant and a density of the proppant.

12. The method of claim 11 , wherein the determining the fracture permeability is performed based on a correlation between the propped fracture width and a dynamic permeability.

13. The method of claim 1 , wherein the determining fracture attributes comprises performing unconventional fracture modeling using the extracted discrete fracture network and Ant-tracking.

14. The method of claim 13 , wherein the fracture permeability is determined from a correlation between dynamic wellbore parameters and fracture attributes.

15. The method of claim 1 , further comprising simulating production based on the fracture attributes.

16. The method of claim 1 , further comprising adjusting the fracture attributes based on the simulated production.

17. The method of claim 16 , wherein the adjusting comprises one of globally adjusting, adjusting by an empirical factor, history matching and combinations thereof.

18. The method of claim 1 , wherein the fracture attributes are selected from the group of fracture width, porosity and permeability.

19. The method of claim 18 , wherein the determining fracture attributes comprises calibrating the discrete fracture network based on formation and stimulation parameters.

20. A method of performing a microseismic fracture operation for a wellsite having a subterranean formation with a fracture network therein, comprising:
performing the microseismic fracture operation with a fracture unit to generate a plurality of microseismic events in the subterranean formation;
describing a relationship between microseismic events of the complex fracture network of the subterranean formation;
generating a fault volume by extracting faults from the fracture network based on the relationship between the microseismic events;
generating a discrete fracture network comprising discrete fractures from the complex fracture network by extracting fracture planes from the obtained fault volume;
determining fracture attributes of the discrete fractures of the fracture planes;
determining permeability from a correlation between dynamic wellsite parameters and the fracture attributes; and
determining an estimated production rate based on the fracture attributes.

21. The method of claim 20 , wherein the determining an estimated production rate is performed using dynamic modeling.

22. The method of claim 21 , further comprising adjusting the fracture attributes based on dynamic modeling.

23. The method of claim 20 , further comprising adjusting the estimated production rate based on actual production.

24. The method of claim 20 , further comprising designing a well plan based on the estimated production rate.

25. The method of claim 20 , further comprising implementing a well plan at the wellsite.

26. The method of claim 25 , wherein the implementing comprises drilling a wellbore, completing the wellbore and producing fluids from the wellbore.

27. A system for performing a microseismic fracture operation for a wellsite having a subterranean formation with a fracture network therein, comprising:
a fracture unit, comprising:
a microseismic tool that generates fault volumes by describing a relationship between microseismic events of the fracture network and extracting faults in the fracture network based on the relationship between the microseismic events;
a fracture tool that generates discrete fractures from the fracture network by extracting fracture planes from the obtained fault volumes and determines fracture attributes of the discrete fractures of the fracture planes;
a wellsite tool that simulates fracture geometry and proppant placement; and
an optimizer that adjusts the fracture attributes based on dynamic modeling.

28. The system of claim 27 , further comprising at least one oilfield tool positionable about the wellsite, the at least one oilfield tool that collects data from the sensors at the wellsite.

29. The system of claim 27 , wherein the at least one oilfield tool comprises at least one of a seismic truck, a wireline tool, a drilling tool, a perforating tool, an injection tool, and combinations thereof.

30. The system of claim 27 , further comprising a surface unit operatively connectable to the fracture unit and the wellsite tool.

31. The system of claim 27 , wherein the wellsite tool determines permeability from a correlation between dynamic wellbore parameters and the fracture attributes.

Assignees

• Ejofodomi Efejera Akpodiate
• Weng Xiaowei
• Schlumberger Technology Corp

Inventors

• Ejofodomi Efejera Akpodiate
• Weng Xiaowei

Classifications

• G01V2210/642

  Faults · CPC title

• G01V2210/1234

  Hydrocarbon reservoir, e.g. spontaneous or induced fracturing · CPC title

• G01V1/288

  Event detection in seismic signals, e.g. microseismics (G01V1/36 takes precedence) · CPC title

• G01V2210/646

  Fractures · CPC title

• G01V1/306 Primary

  for determining physical properties of the subsurface, e.g. impedance, porosity or attenuation profiles · CPC title