Optimizing the separation factor along a directional well trajectory to minimize collision risk

Autor: Vahid Mansouri, Rasool Khosravanian, David A. Wood, Bernt Sigve Aadnøy
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Journal of Petroleum Exploration and Production Technology, Vol 10, Iss 5, Pp 2113-2125 (2020)
Druh dokumentu: article
ISSN: 2190-0558
2190-0566
DOI: 10.1007/s13202-020-00876-7
Popis: Abstract Optimizing the trajectory of directional wellbores is essential to minimize drilling costs and the impacts of potential drilling problems. It poses multi-objective optimization challenges. Well-design optimization models initially focus on wellbore-length minimization, but ideally also need to consider minimizing the surface torque during drilling and address, among other constraints, collision avoidance with offset wells. A novel trajectory-optimization model is described that computes the separation factor along the wellbore. It employs a genetic optimization algorithm with an objective function that maximizes the minimum separation factor along the entire length of a wellbore. Plausible well trajectories are identified within a feasible solution space defined by user-identified constraints. The simplicity and effectiveness of the proposed model are demonstrated using a case study involving real well data from the Reshadat oil field offshore southern Iran. In the case considered, a proposed well trajectory is identified as unsafe in terms of its minimum separation factor with an offset well and is re-planned with the proposed model to achieve a safer trajectory.
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