Active controlled bottomhole pressure system & method
First Claim
1. A drilling system for drilling a wellbore, comprising:
- (a) a drill string;
(b) a source of drilling fluid supplying drilling fluid under pressure into the drill string (a “
supply fluid”
), the drilling fluid returning uphole via an annulus around the drill string (a “
return fluid”
); and
(c) an active pressure differential device (“
APD Device”
) associated with the return fluid to create a pressure drop across said APD Device to reduce pressure in the annulus around the drill string downhole of said APD Device.
1 Assignment
0 Petitions
Accused Products
Abstract
A wellbore drilling system has an umbilical that carries a drill bit in a wellbore. Drilling fluid pumped into the umbilical discharges at the drill bit bottom and returns through an annulus between the umbilical and the wellbore carrying entrained drill cuttings. An active differential pressure device (APD device), such as a jet pump, turbine or centrifugal pump, in fluid communication with the returning fluid creates a differential pressure across the device, which alters the pressure below or downhole of the device. The APD device can be driven by a positive displacement motor, a turbine, an electric motor, or a hydraulic motor. A controller controls the operation of the APD device in response to programmed instructions and/or one or more parameters of interest detected by one or more sensors. A preferred system is a closed loop system that maintains the wellbore at under-balance condition, at-balance condition or over-balance condition.
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Citations
60 Claims
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1. A drilling system for drilling a wellbore, comprising:
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(a) a drill string; (b) a source of drilling fluid supplying drilling fluid under pressure into the drill string (a “
supply fluid”
), the drilling fluid returning uphole via an annulus around the drill string (a “
return fluid”
); and(c) an active pressure differential device (“
APD Device”
) associated with the return fluid to create a pressure drop across said APD Device to reduce pressure in the annulus around the drill string downhole of said APD Device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A drilling system for drilling a wellbore, comprising:
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(a) a drill string; (b) a source of drilling fluid supplying drilling fluid under pressure into the drill string (a “
supply fluid”
) the drilling fluid returning uphole via an annulus around the drill string (a “
return fluid”
);(c) an active pressure differential device (“
APD Device”
) associated with the return fluid to create a pressure drop across said APD Device to reduce pressure in the annulus around the drill string downhole of said APD Device; and(d) a comminution device positioned downhole of said APD device, said comminution device configured to reduce the size of cuttings entrained in the return fluid. - View Dependent Claims (19, 20)
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21. A drilling system for drilling a wellbore, comprising:
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(a) a drill string; (b) a source of drilling fluid supplying drilling fluid under pressure into the drill string(a “
supply fluid”
), the drilling fluid returning uphole via an annulus around the drill string (a “
return fluid”
); and(c) an active pressure differential device (“
APD Device”
) associated with the return fluid to create a pressure drop across said APD Device to reduce pressure in the annulus around the drill string downhole of said APD Device; and(d) sensor for detecting a parameter of interest. - View Dependent Claims (22, 23)
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24. A drilling system for drilling a wellbore, comprising
(a) a drill string; -
(b) a source of drilling fluid supplying drilling fluid under pressure into the drill string (a “
usupply fluid”
), said drilling fluid returning uphole via an annulus around the drill string (a “
return fluid”
);(c) an active pressure differential device (“
APD Device”
) placed in the annulus to create a pressure drop across said APD Device to reduce pressure in the wellbore downhole of said APD Device, said APD Device in fluid communication with the return fluid; and(d) an electric drive assembly being substantially isolated from the supply fluid. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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33. A method for drilling a wellbore, comprising:
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(a) providing a drill string; (b) supplying drilling fluid under pressure into the drill string (a “
supply fluid”
), the drilling fluid returning uphole via an annulus around the drill string (a “
return fluid”
); and(c) positioning an active pressure differential device (“
APD Device”
) in fluid communication with the return fluid to create a pressure drop across the APD Device to reduce pressure in the annulus around the drill string downhole of the APD Device. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A method for drilling a wellbore, comprising:
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(a) providing a drill string; (b) supplying drilling fluid under pressure into the drill string (a “
supply fluid”
), the drilling fluid returning uphole via an annulus around the drill string (a “
return fluid”
);(c) positioning an active pressure differential device (“
APD Device”
) in fluid communication with the return fluid to create a pressure drop across the APD Device to reduce pressure in the annulus around the drill string downhole of the APD Device; and(d) positioning a comminution device downhole of the APD device, the comminution device configured to reduce the size of cuttings entrained in the return fluid. - View Dependent Claims (47, 48)
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49. A method for drilling a wellbore, comprising:
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(a) providing a drill string; (b) supplying drilling fluid under pressure into the drill string (a “
supply fluid”
), the drilling fluid returning uphole via an annulus around the drill string (a “
return fluid”
);(c) positioning an active pressure differential device (“
APD Device”
) in fluid communication with the return fluid to create a pressure drop across the APD Device to reduce pressure in the annulus around the drill string downhole of the APD Device; and(d) detecting a parameter of interest with a sensor. - View Dependent Claims (50, 51)
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52. A method for drilling a wellbore, comprising
(a) providing a drill string; -
(b) supplying drilling fluid under pressure into the drill string (a “
supply fluid”
), the drilling fluid returning uphole via an annulus around the drill string (a “
return fluid”
);(c) placing an active pressure differential device (“
APD Device”
) in the annulus to create a pressure drop across the APD Device to reduce pressure in the wellbore downhole of the APD Device, the APD Device in fluid communication with the return fluid; and(d) driving the APD device with an electric drive assembly that is substantially isolated from the supply fluid. - View Dependent Claims (53, 54, 55, 56)
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57. A drilling system for drilling a wellbore, comprising
(a) a drill string having a drill bit at an end thereof; -
(b) a source of drilling fluid supplying drilling fluid under pressure into the drill string (a “
supply fluid”
), the drilling fluid returning uphole via an annulus around the drill string (a “
return fluid”
);(c) an active pressure differential device (“
APD Device”
) associated with the return fluid to create a pressure drop across said APD Device to reduce pressure in the annulus around the drill string downhole of said APD Device, the APD Device operating substantially independently of rotation of the drill bit.
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58. A method for drilling a wellbore, comprising
(a) conveying a drill string having a drill bit into the wellbore; -
(b) supplying drilling fluid under pressure into the drill string (a “
supply fluid”
), the drilling fluid returning uphole via an annulus around the drill string (a “
return fluid”
);(c) positioning en active pressure differential device (“
APD Device”
) in fluid communication with the return fluid;(d) operating the APD Device to create a pressure drop across the APD Device to reduce pressure in the annulus around the drill string downhole of the APD Device; and (d) rotating the drill bit substantially independently of operating the APD Device.
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59. A drilling system for drilling a wellbore, comprising:
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(a) a drill string; (b) a source of drilling fluid supplying drilling fluid under pressure into the drill string (a “
supply fluid”
), the drilling fluid returning uphole via an annulus around the drill string (a “
return fluid”
); and(c) an active pressure differential device (“
APD Device”
) associated with the return fluid to control pressure in the annulus around the drill string downhole of said APD Device to at least partially offset an equivalent circulating density associated with the flowing drilling fluid.
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60. A method for drilling a wellbore, comprising:
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(a) conveying a drill string into the wellbore; (b) supplying drilling fluid under pressure into the drill string (a “
supply fluid”
), the drilling fluid returning uphole via an annulus around the drill string (a “
return fluid”
);(c) positioning an active pressure differential device (“
APD Device”
) in fluid communication with the return fluid; and(d) operating the APD Device to at least partially offset an equivalent circulating density associated with the flowing drilling fluid.
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Specification