System and Method for Managed Pressure Drilling
First Claim
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1. A drilling system for managed pressure drilling comprising:
- at least one sensor to continually sense at least one real-time fluid property of an input fluid to a well and a return fluid from the well;
a controllably adjustable flow control apparatus disposed in a return flow line to regulate a flow of the return fluid; and
a controller operably connected to the controllably adjustable flow control apparatus to instruct the controllably adjustable flow apparatus to regulate the flow of the return fluid to maintain a wellhead setpoint pressure based at least in part on the real-time sensed fluid property of the input fluid and the return fluid.
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Abstract
A method for controlling a downhole pressure during drilling comprises continually sensing in real-time at least one real-time fluid property of an input fluid to a well and of a return fluid from the well. A wellhead setpoint pressure is calculated in real-time that results in a predetermined downhole pressure at a predetermined location in the well, where the calculation based, at least in part, on the at least one continually sensed real-time fluid property. The flow of the return fluid is controllably regulated to maintain the calculated wellhead setpoint pressure.
28 Citations
17 Claims
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1. A drilling system for managed pressure drilling comprising:
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at least one sensor to continually sense at least one real-time fluid property of an input fluid to a well and a return fluid from the well; a controllably adjustable flow control apparatus disposed in a return flow line to regulate a flow of the return fluid; and a controller operably connected to the controllably adjustable flow control apparatus to instruct the controllably adjustable flow apparatus to regulate the flow of the return fluid to maintain a wellhead setpoint pressure based at least in part on the real-time sensed fluid property of the input fluid and the return fluid. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for controlling a downhole pressure during drilling comprising:
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continually sensing in real-time at least one real-time fluid property of an input fluid to a well and of a return fluid from the well; calculating in real-time a wellhead setpoint pressure that results in a predetermined downhole pressure at a predetermined location in the well, the calculation based at least in part on the at least one continually sensed real-time fluid property; and controllably regulating the flow of the return fluid to maintain the calculated wellhead setpoint pressure. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for controlling an equivalent circulating density in a well comprising:
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continually drawing in real-time a first fluid sample from an input fluid to a well and a second fluid sample from a return fluid from a well; measuring in real-time a fluid density and at least one rheological property of each of the first fluid sample and the second fluid sample; calculating a plurality of pressure losses along a closed flow system based at least in part on the measured fluid density and the at least one rheological property of the input fluid and the return fluid; calculating a wellhead setpoint pressure that results in a predetermined downhole equivalent circulating density at a predetermined location based at least in part on the measured fluid density and the at least one rheological property; and controllably regulating the flow of the return fluid to maintain the calculated wellhead setpoint pressure. - View Dependent Claims (14, 15, 16, 17)
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Specification