Abstract: Various implementations directed to a system and method for using a magnetometer in a gyro-while-drilling (GWD) survey tool are provided. In one implementation, a method may include acquiring gyroscopic data using gyroscopic sensors of a GWD survey tool while the tool is disposed at a first position within a wellbore. The method may also include acquiring first magnetic data using a magnetometer of the GWD survey tool while the tool is disposed at the first position. The method may further include determining an offset value for the magnetometer based on the gyroscopic data and the first magnetic data. The method may additionally include acquiring second magnetic data using the magnetometer while the tool is disposed at second positions within the wellbore. The method may also include determining magnetic azimuth values for the tool disposed at the second positions based on the second magnetic data and the offset value.

Abstract: Various implementations described herein refer to an apparatus having an instrument cluster with accelerometers and gyroscopic sensors. The apparatus may include a controller that communicates with the instrument cluster, receives measurement data from the accelerometers and the gyroscopic sensors, and acquires a computed tool orientation of a drilling tool based on the measurement data from the accelerometers and the gyroscopic sensors. The controller may generate tool steering commands for the drilling tool based on a difference between a planned tool orientation and the computed tool orientation.

Abstract: Various implementations described herein are directed to a method for surveying a wellbore. A statistical estimation process that combines magnetic survey measurement data and gyroscopic survey measurement data to form error estimates in a magnetic survey system is applied. The error estimates are used to correct magnetic survey data provided by the magnetic survey system. Magnetic only survey data is used when convergence of the error estimates has occurred. Information that facilitates drilling the wellbore is provided.

Abstract: Various implementations described herein are directed to a method for surveying a wellbore. A statistical estimation process that combines magnetic survey measurement data and gyroscopic survey measurement data to form error estimates in a magnetic survey system is applied. The error estimates are used to correct magnetic survey data provided by the magnetic survey system. Magnetic only survey data is used when convergence of the error estimates has occurred. Information that facilitates drilling the wellbore is provided.

Abstract: Various implementations described herein refer to a method. The method may include receiving first gyro-while-drilling (GWD) survey data acquired using a first survey tool disposed within a wellbore. The method may include receiving second GWD survey data acquired using a second survey tool disposed within the wellbore. The method may include generating a survey of the wellbore based on the first GWD survey data and the second GWD survey data for directional control of wellbore trajectories.

Abstract: Various implementations described herein may refer to a wellbore survey tool using Coriolis vibratory gyroscopic sensors. In one implementation, a method may include receiving one or more reference values corresponding to the Earth's rotation rate and one or more reference values corresponding to a local latitude of a survey tool disposed in a wellbore. The method may also include receiving rotation rate measurements from one or more quartz Coriolis vibratory gyroscopic (CVG) sensors of the survey tool. The method may further include determining bias-corrected rotation rate measurements using one or more statistical estimation processes and based on the one or more reference values corresponding to the Earth's rotation rate, the one or more reference values corresponding to the local latitude, and the rotation rate measurements. The method may additionally include determining azimuth values of the survey tool based on the bias-corrected rotation rate measurements.

Abstract: A system and method for providing information regarding the tortuosity of a wellbore path is provided. The method includes receiving data from a plurality of survey stations of a wellbore survey. The method further includes defining a plurality of reference lines for the wellbore path. The method further includes determining a plurality of displacements of the wellbore path from the plurality of reference lines.

Abstract: Systems and methods are provided for producing a continuous survey of a previously drilled portion of a wellbore. The method includes receiving a plurality of stationary survey measurements taken at a corresponding plurality of locations along the portion of the wellbore. The method further includes receiving at least one continuous survey including a plurality of continuous survey measurements taken between a pair of stationary survey measurements of the plurality of stationary survey measurements. The method further includes combining the plurality of stationary survey measurements and the plurality of continuous survey measurements to produce the continuous survey of the portion of the wellbore.

Abstract: Various implementations directed to a method and apparatus for initialization of a wellbore survey tool are provided. In one implementation, a method may include positioning a survey tool at a predetermined orientation relative to a directional reference system, where the survey tool is configured to acquire continuous survey data while disposed within a wellbore, and where the survey tool comprises a drop survey tool, a wireline survey tool, or a slickline survey tool. The method may also include using the directional reference system to generate a first signal indicative of an orientation of the directional reference system with respect to a reference direction. The method may further include using the first signal to determine an initial orientation of the survey tool with respect to the reference direction. The method may additionally include moving the survey tool after the initial orientation of the survey tool has been determined.

Abstract: Systems and methods are provided for producing a continuous survey of a previously drilled portion of a wellbore. The method includes receiving a plurality of stationary survey measurements taken at a corresponding plurality of locations along the portion of the wellbore. The method further includes receiving at least one continuous survey including a plurality of continuous survey measurements taken between a pair of stationary survey measurements of the plurality of stationary survey measurements. The method further includes combining the plurality of stationary survey measurements and the plurality of continuous survey measurements to produce the continuous survey of the portion of the wellbore.

Abstract: Various implementations directed to a wellbore survey tool using Coriolis vibratory gyroscopic sensors are provided. In one implementation, a system may include a survey tool disposed in a wellbore. The survey tool may include a plurality of gyroscopic sensors configured to provide a plurality of rotation rate measurements about the survey tool, where the plurality of gyroscopic sensors includes a plurality of quartz Coriolis vibratory gyroscopic (CVG) sensors. The survey tool may further include a plurality of accelerometers configured to provide measurements of the orthogonal components of the Earth's gravitation vector with respect to the survey tool.

Abstract: A method and system for reducing error contributions to gyroscopic measurements is provided. The method includes receiving a plurality of signals indicative of at least one component of the Earth's rotation substantially perpendicular to a portion of a wellbore and a component of the Earth's rotation substantially parallel to the portion of the wellbore. The plurality of signals is generated by one or more gyroscopic sensors within the portion of the wellbore. The method further includes calculating, using the plurality of signals and using one or more signals indicative of the Earth's rotation rate and one or more signals indicative of the latitude of the one or more gyroscopic sensors within the portion of the wellbore, a mass unbalance offset for the one or more gyroscopic sensors.

Abstract: A system and method for providing information regarding the tortuosity of a wellbore path is provided. The method includes receiving data from a plurality of survey stations of a wellbore survey. The method further includes determining a plurality of tortuosity parameter values for the wellbore path within a corresponding plurality of analysis windows, wherein each analysis window has at least one tortuosity parameter value.

Abstract: Various implementations directed to providing a continuous wellbore survey are provided. In one implementation, a method may include acquiring stationary survey data using a survey tool disposed at a stationary position within a wellbore, where the survey tool is configured to be deployed to the stationary position from a moving platform, and where the stationary position is lower than a predetermined depth within the wellbore. The method may also include acquiring continuous survey data during an outrun data acquisition using the survey tool, where the survey tool is configured to ascend within the wellbore during the outrun data acquisition. The method may further include transmitting the continuous survey data and the stationary survey data to a computing system, where the computing system is configured to generate a continuous survey of the wellbore based on the continuous survey data and the stationary survey data.

Abstract: A system and method for providing information regarding the tortuosity of a wellbore path is provided. The method includes receiving data from a plurality of survey stations of a wellbore survey. The method further includes defining a plurality of reference lines for the wellbore path. The method further includes determining a plurality of displacements of the wellbore path from the plurality of reference lines.

Abstract: Various implementations directed to a method and apparatus for initialization of a wellbore survey tool are provided. In one implementation, a method may include positioning a survey tool at a predetermined orientation relative to a directional reference system, where the survey tool is configured to acquire continuous survey data while disposed within a wellbore, and where the survey tool comprises a drop survey tool, a wireline survey tool, or a slickline survey tool. The method may also include using the directional reference system to generate a first signal indicative of an orientation of the directional reference system with respect to a reference direction. The method may further include using the first signal to determine an initial orientation of the survey tool with respect to the reference direction. The method may additionally include moving the survey tool after the initial orientation of the survey tool has been determined.

Abstract: A system and method for providing information regarding the tortuosity of a wellbore path is provided. The method includes receiving data from a plurality of survey stations of a wellbore survey. The method further includes determining a plurality of tortuosity parameter values for the wellbore path within a corresponding plurality of analysis windows, wherein each analysis window has at least one tortuosity parameter value.

Abstract: A system and method for providing information regarding the tortuosity of a wellbore path is provided. The method includes receiving data from a plurality of survey stations of a wellbore survey. The method further includes defining a plurality of reference lines for the wellbore path. The method further includes determining a plurality of displacements of the wellbore path from the plurality of reference lines.

Abstract: Various implementations described herein refer to an apparatus having an instrument cluster with accelerometers and gyroscopic sensors. The apparatus may include a controller that communicates with the instrument cluster, receives measurement data from the accelerometers and the gyroscopic sensors, and acquires a computed tool orientation of a drilling tool based on the measurement data from the accelerometers and the gyroscopic sensors. The controller may generate tool steering commands for the drilling tool based on a difference between a planned tool orientation and the computed tool orientation.

Abstract: Various implementations described herein refer to a method. The method may include receiving first gyro-while-drilling (GWD) survey data acquired using a first survey tool disposed within a wellbore. The method may include receiving second GWD survey data acquired using a second survey tool disposed within the wellbore. The method may include generating a survey of the wellbore based on the first GWD survey data and the second GWD survey data for directional control of wellbore trajectories.