Method of mitigating risk of well collision in a field

• US 7,599,797 B2
• Filed: 02/09/2006
• Issued: 10/06/2009
• Est. Priority Date: 02/09/2006
• Status: Expired due to Fees

• Current Assignee: Schlumberger Drive
• Original Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Inventors: San Antonio, Tamara, Poedjono, Benny
• Primary Examiner(s): Tran; Khoi
• Assistant Examiner(s): SAMPLE, JONATHAN L
• Application Number:
  US11/350,655
• Publication Number:
  US 20070203648A1
• Time in Patent Office: 1,335 Days
• Field of Search: 701300-302, 175/45
• 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. A method of mitigating risk of subsurface well collision, comprising:

obtaining a survey of a field wherein a subject well is to be drilled;

running an anti-collision scan while planning or drilling the subject well to determine if a requirement to be fulfilled in the process of drilling the subject well is violated, the requirement being based on the field survey to avoid collision between the subject well and offset wells in the field;

generating an anti-collision report indicating if and where along the subject well the requirement to be fulfilled in the process of drilling the subject well is violated;

generating a request for an exemption to the requirement that is violated, the request indicating a severity of the risk of collision between the subject well and an offset well from minor to major risk;

assessing the exemption request using a three-dimensional matrix, the dimensions including parameters comprising a center-to-center distance, a separation factor, a surface rule, a mud weight, a hydrostatic pressure, a collision depth, a reservoir pressure, a magnetic scan, a survey program, or a completion type;

deriving a cell within the matrix during assessment of the exemption request based on values for the parameters of the matrix dimensions for the subject well included in the exemption request; and

generating a visual display of the exemption request assessment results to determine if action is required to manage the likelihood of an event controlling a risk of collision or to reduce or eliminate the potential risk of collision between the subject well and an offset well based on a set of actions in the derived matrix cell.

2. The method of claim 1, wherein the three-dimensional matrix further comprises at least one process path providing guidance for quality control of parameter values input to the matrix.

3. The method of claim 1, further comprising updating a three-dimensional matrix parameter value after assessing the exemption request.

4. The method of claim 3, further comprising re-assessing the exemption request after updating the three-dimensional matrix parameter value.