Automatic Event Detection and Control while Drilling in Closed Loop Systems

摘要

Controlled pressure drilling of a borehole with a drilling system detects events and identifies the events as being one of a gas-at-surface event, a kick event, a high-pressure low-volume depletion event, and a gas expansion event. Parameters including flow-in, flow-out, density, and standpipe pressure are monitored. A volume increase is detected between the flow-in and flow-out, and an initiation point of the detected volume increase is identified. At this point, an event from the initiation point is identified based on the monitored parameters from the initiation point. To identify a kick event, for example, the standpipe pressure is determined to have increased from the initiation point without the density decreasing since the initiation point, and a cumulative volume value from the initiation point is determined to be above a first threshold. In response to the identified event, an action is initiated in the drilling system.

主权项

1. A controlled pressure drilling method of a borehole with a drilling system, the method comprising:
monitoring parameters including flow-in, flow-out, density, and standpipe pressure; detecting a change between the flow-in and the flow-out; identifying, in response to the detection, an initiation point of the detected change; identifying, based on the monitored parameters from the initiation point, an event from the initiation point as being a gas-at-surface event by detecting a decrease in density from the initiation point; and initiating an action in the drilling system in response to the identified gas-at-surface event.