Borehole casing deployment detection

A casing deployment detection apparatus comprising:

• a plurality of sensors for measuring data relating to a borehole in which casing is being deployed or for measuring a system for constructing the borehole, or for measuring both;
• a processing resource arranged to support a signal pattern recognition engine unit and a block position calculation unit;
• a first sensor input operably coupled to the signal pattern recognition engine unit and arranged to receive, when in use, first sensor data corresponding to a first time-varying sensor signal;
• a second sensor input operably coupled to a tubular measurement unit and arranged to receive, when in use, second sensor data corresponding to a second time-varying sensor signal;
• wherein the signal pattern recognition engine unit is arranged to analyze a characteristic of the first sensor data associated with deployment of the casing in the borehole;
• and
• wherein the block position calculation unit is arranged to analyze a characteristic of the second sensor data associated with the deployment of the casing in the borehole;
• and
• wherein the processing resource is configured to perform operations, the operations comprising:
• determining an in-slips event based on a first characteristic of the first sensor data matching a first expected characteristic, the in-slips event being at a first time;
• in response to determining the in-slips event, identifying a candidate casing time window that follows the first time for a duration;
• determining one or more second characteristics that distinguish a casing deployment operation from one or more other operations, the one or more second characteristics being determined based on the second time-varying sensor signal during the candidate casing time window, wherein the one or more second characteristics comprise a length of a tubular element deployed into the borehole during the candidate casing time window;
• and
• in response to determining the one or more second characteristics, determining one or more third characteristics based on third sensor data from at least one of the one or more sensors taken during the candidate casing time window, wherein the one or more third characteristics further distinguish the casing deployment operation from one or more other operations and increase a confidence that the casing deployment operation occurs during the candidate casing time window;
• and
• identifying deployment of casing in the borehole in the candidate casing time window based on the first characteristic, the one or more second characteristics, and the third characteristic.