Method for determining uncertainty with projected wellbore position and attitude
First Claim
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1. A method for determining a quantitative uncertainty of a wellbore orientation, comprising:
- obtaining a measurement related to a first orientation of a drill string using a measurement device connected to the drill string; and
operating a terminal communicatively connected with the measurement device to;
predict a second orientation of the drill string based on drilling settings and the first orientation; and
determine a quantitative probability that the second orientation will be within a first predetermined area of uncertainty about the second orientation, wherein the determined quantitative probability is a percentage ranging between 0 and 1.
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Abstract
A system and method for determining uncertainty of a wellbore orientation is disclosed. The system and method obtains a measurement related to a first orientation of a drill string at a measurement device. Based on the first orientation and drilling settings, the system and method predict a second orientation. A probability of the second orientation being within a predetermined area is also obtained. As a result of this information, an action may be taken, such as, skipping a planned static survey, obtaining a static survey prior to the plan, or changing a drilling setting.
30 Citations
24 Claims
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1. A method for determining a quantitative uncertainty of a wellbore orientation, comprising:
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obtaining a measurement related to a first orientation of a drill string using a measurement device connected to the drill string; and operating a terminal communicatively connected with the measurement device to; predict a second orientation of the drill string based on drilling settings and the first orientation; and determine a quantitative probability that the second orientation will be within a first predetermined area of uncertainty about the second orientation, wherein the determined quantitative probability is a percentage ranging between 0 and 1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 24)
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9. The method of 1 further comprising:
determining an uncertainty pertaining to the quantitative probability that the second orientation will be within a second predetermined region, the second predetermined region including all of the first predetermined region, wherein the determined uncertainty is a percentage ranging between 0 and 1.
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13. A method for determining a quantitative uncertainty of a wellbore orientation comprising:
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predicting, using a terminal, a first orientation measurement at a first position of the drill string, wherein the first position is located at a position in which the drill string is expected to reach; obtaining, using a measurement device connected to the drill string and communicatively connected with the terminal, the first orientation measurement at a position adjacent the first position; determining, using the terminal, an error between the first orientation measurement predicted and the first orientation measurement obtained; predicting, using the terminal, a second orientation measurement at a second position of the drill string, the second position being a position beyond the first position that the drill string is expected to reach; and determining, using the terminal, a quantitative uncertainty associated with the second positional measurement based on the error, wherein the determined quantitative uncertainty is a percentage ranging between 0 and 1. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for determining a quantitative uncertainty of a wellbore orientation comprising:
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obtaining a first orientation measurement at a first position in the wellbore using a measurement device connected to a drill string within the wellbore; calibrating a model to predict a second orientation measurement based on the first orientation, a build curvature and a turn curvature of the drill string, using a terminal communicatively connected with the measurement device, wherein the second position is a predicted position that the wellbore will reach; at the first position, predicting a second orientation measurement at a second position using the terminal; adjacent the second position, obtaining the second orientation using the measurement device; computing an error between the predicted second orientation measurement and the obtained second orientation measurement using the terminal; predicting a third orientation measurement at a third position based on the build curvature, the turn curvature and the second orientation measurement, using the terminal, wherein the third position is adjacent to or beyond a location of a drill bit attached to the drill string; and determining a quantitative uncertainty associated with the predicted third orientation measurement using the terminal, wherein the determined quantitative uncertainty is a percentage ranging between 0 and 1. - View Dependent Claims (20, 21, 22, 23)
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Specification