US2014083769A1PendingUtilityA1
Coiled Tube Drilling Bottom Hole Assembly Having Wireless Power And Data Connection
Assignee: SCHLUMBERGER TECHNOLOGY CORPPriority: Sep 24, 2012Filed: Mar 12, 2013Published: Mar 27, 2014
Est. expirySep 24, 2032(~6.2 yrs left)· nominal 20-yr term from priority
E21B 44/00E21B 7/04E21B 47/13
42
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Claims
Abstract
Various embodiments of methods and systems for providing wireless power and data communication in a drilling assembly. One embodiment includes a system for transmitting power or data communications in a drill string. The system includes a drilling assembly having an inner cylindrical coil located inside an outer cylindrical coil. The inner cylindrical coil is adapted to rotate with respect to the outer cylindrical coil, rotate around an axis of the outer cylindrical coil, or move axially with respect to the outer cylindrical coil.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A method for operating a drilling assembly, the method comprising:
providing a first coil within a second coil; coupling the first and second coils with a coupling coefficient, k, wherein, k=M/√{square root over (L 1 L 2 )}≦0.9, M is a mutual inductance between the first and second coils, L 1 is a first self-inductance of the first coil, and L 2 is a second self-inductance of the second coil; and resonantly tuning the first coil at a first frequency, f 1 , with a first capacitance, C 1 , and the second coil at a second frequency, f 2 , with a second capacitance, C 2 , wherein f 1 is approximately equal to f 2 ,
f
1
=
1
2
π
L
1
C
1
and
f
2
=
1
2
π
L
2
C
2
;
wherein the first and second coils have a figure of merit, U, wherein U=k√{square root over (Q 1 Q 2 )}≧3,
Q
1
=
2
π
f
1
L
1
R
1
,
Q
2
=
2
π
f
2
L
2
R
2
,
Q 1 and Q 2 comprise respective quality factors associated with the first and second coils, and R 1 and R 2 comprise respective resistances of the first and second coils.
2 . The method of claim 1 , wherein the first and second coils comprise cylindrical wire coils.
3 . The method of claim 2 , wherein the first coil comprises an inner coil comprising a wire wrapped on a core of material having a relatively high magnetic permeability.
4 . The method of claim 3 , wherein the material comprises ferrite.
5 . The method of claim 2 , wherein the second coil comprises an outer coil surrounded by a cylinder of material with a relatively high magnetic permeability.
6 . The method of claim 5 , wherein the material comprises ferrite.
7 . The method of claim 1 , further comprising:
approximately matching a source impedance of the first coil, R s , with a load impedance of the second coil, R 1 , wherein R S ≈R 1 √{square root over (1+k 2 Q 1 Q 2 )}.
8 . The method of claim 1 , further comprising:
approximately matching a load impedance of the second coil, R 1 , with a source impedance of the first coil, R s , wherein R L ≈R 2 √{square root over (1+k 2 Q 1 Q 2 )}.
9 . The method of claim 1 , wherein the first coil is coupled to a rotor of a positive displacement motor (PDM), and the second coil is coupled to a drill collar of the PDM.
10 . The method of claim 1 , further comprising:
passing drilling fluid through a passage between the first and second coils.
11 . The method of claim 1 , further comprising:
transmitting power between the first and second coils.
12 . The method of claim 1 , further comprising:
transmitting data between the first and second coils.
13 . The method of claim 11 , wherein the transmitting data between the first and second coils comprises modulating one of an amplitude, a phase, and a frequency of a current.
14 . A system for transmitting power or data communications in a drill string, the system comprising:
a drilling assembly comprising an inner cylindrical coil located inside an outer cylindrical coil, wherein the inner cylindrical coil is adapted to rotate with respect to the outer cylindrical coil, rotate around an axis of the outer cylindrical coil, or move axially with respect to the outer cylindrical coil.
15 . The system of claim 14 , wherein power is transmitted between the inner and outer cylindrical coils.
16 . The system of claim 14 , wherein data communications are provided between the inner and outer cylindrical coils.
17 . A bottom hole assembly (BHA) for use in a coiled tube drilling system, the BHA comprising:
a measuring-while-drilling (MWD) module configured for coupling to coiled tubing; and a wireless power and data connection disposed above a drilling motor for providing power and data connectivity between the MWD module and the drilling motor.
18 . The BHA of claim 17 , further comprising:
a rotary steerable system (RSS) coupled to the drilling motor for receiving power from and communicating with the MWD module via the wireless power and data connection and the drilling motor.
19 . The BHA of claim 18 , further comprising a drill bit assembly coupled to the RSS, and wherein the wireless power and data connection comprises an inductively coupled pair of coils comprising a primary coil and a secondary coil.
20 . The BHA of claim 17 , further comprising:
an orienter configured for coupling to coiled tubing and receiving a wireline conductor disposed in the coiled tubing; wherein the wireless power and data connection provides power and data connectivity to one or more downhole components of the BHA.Cited by (0)
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