Method for estimating the probability of collision between wells
First Claim
1. A method for drilling a well, the method comprising:
- identifying another well proximate to the well being drilled;
collecting spatial information for at least a portion of the another well and the well being drilled, and representing one of the well being drilled and the another well as a line corresponding to a center line of the well being drilled or the another well;
representing the other of the well being drilled and the another well as an object having a radius based on a radius of the another well and a radius of the well being drilled;
estimating a trajectory for at least a portion of the well being drilled and the another well;
estimating an uncertainty in spatial information for each trajectory;
estimating a probability of a collision between the center line and the object during the drilling of the well by integrating a probability density function using the uncertainties and the trajectories; and
performing the drilling in a manner that limits the probability of collision.
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Abstract
A method for drilling a well, the method including: identifying another well proximate to the well being drilled; collecting spatial information for at least a portion of the another well and the well being drilled; estimating a trajectory for at least a portion of the well being drilled and the another well; estimating an uncertainty in spatial information for each trajectory; estimating a probability of a collision with the another well during the drilling of the well by integrating a probability density function using the uncertainties and the trajectories; and performing the drilling in a manner that limits the probability of collision. A system and another method are provided.
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Citations
19 Claims
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1. A method for drilling a well, the method comprising:
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identifying another well proximate to the well being drilled; collecting spatial information for at least a portion of the another well and the well being drilled, and representing one of the well being drilled and the another well as a line corresponding to a center line of the well being drilled or the another well; representing the other of the well being drilled and the another well as an object having a radius based on a radius of the another well and a radius of the well being drilled; estimating a trajectory for at least a portion of the well being drilled and the another well; estimating an uncertainty in spatial information for each trajectory; estimating a probability of a collision between the center line and the object during the drilling of the well by integrating a probability density function using the uncertainties and the trajectories; and performing the drilling in a manner that limits the probability of collision. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for drilling a well, the system comprising:
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a drilling apparatus for drilling the well, the apparatus adapted for receiving directional information from a processor and adjusting drilling according to the directional information; the processor equipped for implementing instructions for avoiding collision during drilling of a well by performing a method comprising;
identifying another well proximate to the well being drilled;
collecting spatial information for at least a portion of the another well and the well being drilled, and representing one of the well being drilled and the another well as a line corresponding to a center line of the well being drilled or the another well;
representing the other of the well being drilled and the another well as an object having a radius based on a radius of the another well and a radius of the well being drilled;
estimating a trajectory for at least a portion of the well being drilled and the another well;
estimating an uncertainty in spatial information for each trajectory;estimating a probability of a collision between the center line and the object during the drilling of the well by integrating a probability density function using the uncertainties and the trajectories; and
performing the drilling in a manner that limits the probability of collision.
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15. A method for estimating a probability of collision, P, between near-parallel wells, the method comprising:
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collecting spatial information by a survey tool for a well being drilled and for a planned drilling path of the well being drilled; collecting spatial information by a survey tool for at least a portion of another well that is at least near-parallel to the well being drilled; estimating separation information, S0, and radius information, R0, for a given depth, L based on the spatial information; inputting at least the separation information and the radius information to a processor configured to estimate a probability, P, of collision between the object well and the planned well at the depth L; and estimating the probability by solving a relationship via the processor, the relationship comprising; - View Dependent Claims (16, 17, 18)
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19. A method for drilling a well, the method comprising:
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identifying another well proximate to the well being drilled; collecting spatial information for at least a portion of the another well and the well being drilled, and representing the well being drilled or the another well as a line corresponding to a center line of the well being drilled or the another well; estimating a trajectory for at least a portion of the well being drilled and the another well; estimating an uncertainty in spatial information for each trajectory; estimating a probability of a collision with the another well during the drilling of the well by integrating a probability density function using the uncertainties and the trajectories, the integration performed by breaking a volume of interest into volume elements, and summing the probability density function values corresponding to the centroids of those volume elements, weighted by volume of each volume element; and performing the drilling in a manner that limits the probability of collision.
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Specification