Formation modeling while drilling for enhanced high angle for horizontal well placement
First Claim
1. A method for defining logging while drilling measurements to be used for proactive well placement while drilling a high angle or horizontal wellbore in a reservoir, the method comprising:
- providing an initial reservoir model for the reservoir;
extracting a section of the reservoir model for a planned trajectory of the wellbore;
generating, using a computer, a secondary model by performing secondary modeling for at least part of the planned trajectory;
identifying, using the computer, an area of interest within the secondary model where statistical uncertainty is high;
defining possible causes of the statistical uncertainty in the area of interest within the secondary model that are not present in the initial reservoir model;
defining a set of parameters for the area of interest based on the possible causes of statistical uncertainty;
modeling, using the computer, logging tool responses in the area of interest for at least one logging while drilling tool;
evaluating, using the computer, sensitivities of the modeled logging tool responses to a subset of the set of parameters by generating and assessing at least one tertiary model for a range of the subset of parameters;
identifying, using the computer, which parameters correlate to greatest sensitivities in the modeled logging tool responses from the subset of parameters and corresponding logging while drilling measurements; and
defining, using the computer, one or more logging while drilling measurements to be used for proactive well placement along the planned trajectory based on the parameters that correlate to the greatest sensitivities in the modeled logging tool responses.
2 Assignments
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Accused Products
Abstract
LWD measurements to be used for proactive well placement while drilling a high angle or horizontal wellbore in a reservoir are defined. An initial reservoir model is provided and a section is extracted for a planned wellbore trajectory. A secondary model is generated for the planned trajectory. An area of interest is identified where statistical uncertainty is high. Possible causes of the statistical uncertainty are identified that are not present in the initial reservoir model. A set of parameters are defined based on the possible causes of statistical uncertainty. The area of interest is logged with LWD tool. Sensitivities of the LWD tool response to a subset of parameters are evaluated by performing tertiary model for a range of the subset of parameters. The most sensitive parameters from the subset of parameters and corresponding measurements are identified. LWD measurements are defined based on the most sensitive parameters.
46 Citations
39 Claims
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1. A method for defining logging while drilling measurements to be used for proactive well placement while drilling a high angle or horizontal wellbore in a reservoir, the method comprising:
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providing an initial reservoir model for the reservoir; extracting a section of the reservoir model for a planned trajectory of the wellbore; generating, using a computer, a secondary model by performing secondary modeling for at least part of the planned trajectory; identifying, using the computer, an area of interest within the secondary model where statistical uncertainty is high; defining possible causes of the statistical uncertainty in the area of interest within the secondary model that are not present in the initial reservoir model; defining a set of parameters for the area of interest based on the possible causes of statistical uncertainty; modeling, using the computer, logging tool responses in the area of interest for at least one logging while drilling tool; evaluating, using the computer, sensitivities of the modeled logging tool responses to a subset of the set of parameters by generating and assessing at least one tertiary model for a range of the subset of parameters; identifying, using the computer, which parameters correlate to greatest sensitivities in the modeled logging tool responses from the subset of parameters and corresponding logging while drilling measurements; and defining, using the computer, one or more logging while drilling measurements to be used for proactive well placement along the planned trajectory based on the parameters that correlate to the greatest sensitivities in the modeled logging tool responses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 34, 35, 36, 37, 38, 39)
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11. The method of claim wherein the defining of possible causes of the statistical uncertainty in the area of interest within the secondary model and the defining of the set of parameters for the area of interest based on the possible causes of statistical uncertainty further comprises selecting the tertiary model from the group consisting of nearby bed boundaries, nearby formation layers, nearby faults, properties of wellbore fluid invasion, oil water contact (OWC), gas oil contact (GOC), wellbore properties and nearby fractures, wherein the tertiary model is not present in the secondary model.
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18. A method for defining logging while drilling measurements to be used for proactive well placement while drilling a high angle or horizontal wellbore in a reservoir, the method comprising:
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providing an initial reservoir model for the reservoir; extracting a section of the reservoir model for a planned trajectory of the wellbore; generating, using a computer, a secondary model by performing secondary modeling for at least part of the planned trajectory; identifying, using the computer, an area of interest within the secondary model where statistical uncertainty is high; defining possible causes of the statistical uncertainty in the area of interest within the secondary model that are not present in the initial reservoir model; defining a set of parameters for the area of interest based on the possible causes of statistical uncertainty; logging the area of interest with at least one logging while drilling tool to produce logging while drilling tool responses; evaluating, using the computer, sensitivities of the produced logging while drilling tool responses to a subset of the set of parameters by generating and assessing at least one tertiary model for a range of the subset of parameters; identifying, using the computer, which parameters correlate to greatest sensitivities in the produced logging while drilling tool responses from the subset of parameters and corresponding logging while drilling measurements; and defining, using the computer, one or more logging while drilling measurements to be used for proactive well placement along the planned trajectory based on the parameters that correlate to the greatest sensitivities in the produced logging while drilling tool responses. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification