1991
DOI: 10.2118/23941-pa
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Application of Risk Analysis Methods to Subsurface Well Collisions

Abstract: Summary Subsurface separation criteria have evolved empirically over the years. They still are based largely on untested assumptions about safety factors, comfort values, and survey tool accuracy. A mathematical analysis of the probability of collision combined with a decision tree describing the consequences provides a method of risk evaluation. The mathematics can be simplified under certain special assumptions, allowing key features of the problem to he illustrated. A flow chart of the dir… Show more

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Cited by 18 publications
(12 citation statements)
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“…Most existing approaches to collision avoidance work locally on a point of interest within the reference well rather than a particular interval of interest along the reference well [7,8,9,10,11,12,13]. Computation over an interval, as in our proposed geometric approach, is a more meaningful concept.…”
Section: A Existing Approaches To Drill Path Collision Avoidancementioning
confidence: 99%
“…Most existing approaches to collision avoidance work locally on a point of interest within the reference well rather than a particular interval of interest along the reference well [7,8,9,10,11,12,13]. Computation over an interval, as in our proposed geometric approach, is a more meaningful concept.…”
Section: A Existing Approaches To Drill Path Collision Avoidancementioning
confidence: 99%
“…At the beginning, the adjacent well distance scan calculations [1][2][3][4][5] is used to evaluate the degree of compliance between actual wellbore trajectory and designed wellbore trajectory and the collision risk between adjacent wells. In 1991, Thorogood J L put forward the separation factor method to assess the collision risk between adjacent wells [6]. In 1996, Brooks A G introduced a method to evaluate the collision possibility between adjacent wells by probabilistic method [7].…”
Section: Introductionmentioning
confidence: 99%
“…In spite of pioneering attempts to express the complex problem in a simple form (Thorogood et al 1990and 1991, Roper and Henly 1996, Brooks and Wilson 1996, Williamson 1998, most operators today still rely on rule-of-thumb methods with little mathematical foundation. For example, the clearance factor or separation factor is widely used as an indicator of collision probability; while this is basically a ratio of well separation to positional uncertainty, there are many different implementations, none of which bears a strong mathematical correlation to collision probability.…”
Section: Introductionmentioning
confidence: 99%
“…Methods which solve the problem by integration of two or three-dimensional probability density functions have been described by Thorogood et al (1990 and1991), Brooks and Wilson (1996), Roper and Henly (1996), and Tsao et al (1999). While sometimes less restrictive than the one-dimensional integration, these methods do not completely represent the general problem.…”
Section: Introductionmentioning
confidence: 99%