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公开(公告)号：CA2711621C
公开(公告)日：2018-06-05
申请号：CA2711621
申请日：2010-07-27
Applicant: WEATHERFORD/LAMB INC
Inventor： HOYER CAREL W , HANNEGAN DON M , BAILEY THOMAS F , JACOBS MELVIN T , WHITE NICKY A
Abstract: A Drill-To-The-Limit (DTTL) drilling method variant to Managed Pressure Drilling (MPD) applies constant surface backpressure, whether the mud is circulating (choke valve open) or not (choke valve closed). Because of the constant application of surface backpressure, the DTTL method can use lighter mud weight that still has the cutting carrying ability to keep the borehole clean. The DTTL method identifies the weakest component of the pressure containment system, such as the fracture pressure of the formation or the casing shoe leak off test (LOT). With a higher pressure rated RCD, such as 5,000 psi (34,474 kPa) dynamic or working pressure and 10,000 psi (68,948 kPa) static pressure, the limitation will generally be the fracture pressure of the formation or the LOT. In the DTTL method, since surface backpressure is constantly applied, the pore pressure limitation of the conventional drilling window can be disregarded in developing the fluid and drilling programs. Using the DTTL method a deeper wellbore can be drilled with larger resulting end tubulars, such as casings and production liners, than had been capable with conventional MPD applications.
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公开(公告)号：CA2692209C
公开(公告)日：2019-07-02
申请号：CA2692209
申请日：2010-02-05
Applicant: WEATHERFORD LAMB INC
Inventor： GRAY KEVIN L , BAILEY THOMAS F , CHAMBERS JAMES W , SOKOL JONATHAN P , WHITE NICKY A
IPC: E21B33/038 , E21B17/01 , E21B47/00 , E21B47/09
Abstract: Latch position indicator systems remotely determine whether a latch assembly is latched or unlatched. The latch assembly may be a single latch assembly or a dual latch assembly. An oilfield device may be positioned with the latch assembly. Non-contact (position), contact (on/off and/or position) and hydraulic (flowmeter), both direct and indirect, embodiments include fluid measurement systems, an electrical switch system, a mechanical valve system, and proximity sensor systems.
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公开(公告)号：CA2855020C
公开(公告)日：2018-05-15
申请号：CA2855020
申请日：2010-07-27
Applicant: WEATHERFORD/LAMB INC
Inventor： HOYER CAREL W , HANNEGAN DON M , BAILEY THOMAS F , JACOBS MELVIN T , WHITE NICKY A
Abstract: A Drill-To-The-Limit (DTTL) drilling method variant to Managed Pressure Drilling (MPD) applies constant surface backpressure, whether the mud is circulating (choke valve open) or not (choke valve closed). Because of the constant application of surface backpressure, the DTTL method can use lighter mud weight that still has the cutting carrying ability to keep the borehole clean. The DTTL method identifies the weakest component of the pressure containment system, such as the fracture pressure of the formation or the casing shoe leak off test (LOT). With a higher pressure rated RCD, such as 5,000 psi (34,474 kPa) dynamic or working pressure and 10,000 psi (68,948 kPa) static pressure, the limitation will generally be the fracture pressure of the formation or the LOT. In the DTTL method, since surface backpressure is constantly applied, the pore pressure limitation of the conventional drilling window can be disregarded in developing the fluid and drilling programs. Using the DTTL method a deeper wellbore can be drilled with larger resulting end tubulars, such as casings and production liners, than had been capable with conventional MPD applications.
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