Method of mitigating risk of well collision in a field

• US 20070203648A1
• Filed: 02/09/2006
• Published: 08/30/2007
• Est. Priority Date: 02/09/2006
• Status: Active Grant

• Current Assignee: Schlumberger Drive
• Original Assignee: Schlumberger Drive
• Inventors: Poedjono, Benny, Antonio, Tamara
• Granted Patent: US 7,599,797 B2
• Time in Patent Office: Days
• US Class Current: 701/301
• CPC Class Codes: E21B 47/022 of the borehole, e.g. using geomagnetism
• CPC Class Codes: G06F 30/10 Geometric CAD

Abstract

A method and system for mitigating risk of well collision in a field includes receiving an anti-collision standard exemption request containing a description of risk of collision between a subject well and one or more offset wells, generating an assessment of the anti-collision standard exemption request using a stored multidimensional decision matrix, reviewing the assessment, and selectively updating the decision matrix based on the review.

Claims

1-13. -13. (canceled)

14-22. -22. (canceled)

23. A method of mitigating risk of subsurface well collision, comprising:

establishing a multidimensional matrix, wherein each dimension is characterized by one or more parameters associated with a well, a well tool, a drilling rule, a subsurface characteristic, a surface characteristic or a well-to-well characteristic;

determining a parameter value for a subject well prior to or during drilling of the well, the value chosen for a parameter in the multidimensional matrix;

inputting the determined subject well parameter value to the multidimensional matrix to derive a cell within the matrix, the cell comprising an established parameter value corresponding to the input parameter value and an action parameter;

determining the action parameter in the derived matrix cell; and

assessing the action parameter to determine if action is required to mitigate risk of well collision between the subject well and and offset well.

24. The method of claim 23, wherein the multidimensional matrix has at least three dimensions.

25. The method of claim 24, wherein the multidimensional matrix further comprises at least one process path providing guidance for quality control of the parameter values input to the matrix.

26. The method of claim 23, futher comprising updating a multidimensional matrix parameter value after assessing the determined action parameter.

27. The method of claim 26, futher comprising re-determining an action parameter in a derived matrix cell after updating the multidimensional matrix parameter value.

28. The method of claim 24, wherein the established multidimensional matrix parameters comprise one of one or more of a separation distance between wells, mud data, pressure data, depth data, reservoir data, well log data, well tool data, rig data, and completion data,

29. The method of claim 23, further comprising running an anti-collision scan to determine if a subject well is at risk of collision with an offset well prior to inputting the determined subject well parameter value to the multidimensional matrix.

30. The method of claim 29, further comprising generating an anti-collision report, the report including a depth along the subject well where an anti-collision rule is violated.

31. The method of claim 30, further comprising generating an anti-collision exemption request based on the anti-collision report.