US2014083770A1PendingUtilityA1
System And Method For Wireless Drilling And Non-Rotating Mining Extenders In A Drilling Operation
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 17/0283E21B 47/13E21B 47/12
42
PatentIndex Score
0
Cited by
0
References
0
Claims
Abstract
Various embodiments of methods and systems for wireless power and data communications transmissions to a sensor subassembly below a mud motor in a bottom hole assembly are disclosed. Power and/or communications are transmitted through stationary or fixed coils. By leveraging resonantly tuned circuits and impedance matching techniques for the stationary coils, power and/or communications can be transmitted efficiently from one stationary coil to the other stationary coil despite any vibration and/or misalignment of the two coils.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A drilling and mining (“D&M”) extender device for communicatively coupling two stationary tools in a bottom hole assembly of a drill string, the extender device comprising:
a first stationary coil associated with a first tool; and
a second stationary coil associated with a second tool;
wherein electrical transmissions between the first and second tools are transmitted wirelessly between the first and second stationary coils via inductive coupling between the coils; the first stationary coil positioned proximate to the second stationary coil; the coils are inductively coupled such that: k=M/√{square root over (L 1 L 2 )}≦0.9, wherein k is the coupling coefficient of the coils, M is the mutual inductance between the coils, and L 1 and L 2 are the self-inductances of the respective coils; each coil is resonantly tuned with a capacitor such that: f 1 ≈f 2 , wherein
f
1
=
1
2
π
L
1
C
1
and
f
2
=
1
2
π
L
2
C
2
and f 1 and f 2 are the frequencies in Hertz of the respective coils, L 1 and L 2 are the self-inductances of the respective coils, and C 1 and C 2 are capacitances of tuning capacitors associated with the respective coils; and the coils have an associated figure of merit, U, such that: U=k√{square root over (Q 1 Q 2 )}≧3, wherein
Q
1
=
2
π
f
1
L
1
R
1
and
Q
2
=
2
π
f
2
L
2
R
2
and Q1 and Q2 are the quality factors associated with the respective coils, f 1 and f 2 are the frequencies in Hertz of the respective coils, L 1 and L 2 are the self-inductances of the respective coils, and R 1 and R 2 are the resistances of the respective coils.
2 . The drilling and mining extender device of claim 1 , wherein the first tool has an impedance as a source, R S wherein the impedance is governed by the equation:
R S ≈R 1 √{square root over (1+ k 2 Q 1 Q 2 )},
wherein R 1 is the series resistance of the first coil, k is the coupling coefficient of the pair of coils, Q 1 is the quality factor associated with the first coil and Q 2 is the quality factor associated with the second coil.
3 . The drilling and mining extender device of claim 2 , further comprising approximately matching an impedance of the second tool with an impedance of the source by setting:
R L ≈R 2 √{square root over (1+ k 2 Q 1 Q 2 )},
wherein R 2 is the series resistance of the second coil, k is the coupling coefficient of the pair of coils, Q 1 is the quality factor associated with primary coil and Q 2 is the quality factor associated with the second coil.
4 . The drilling and mining extender device of claim 1 , wherein one or more of the electrical transmissions are selected from the group of power transmissions and data communication transmissions.
5 . The drilling and mining extender device of claim 1 , wherein the first coil is of a mandrel type and the second coil is of a annular type.
6 . The drilling and mining extender device of claim 1 , wherein the first coil is of a mandrel type and the second coil is of a mandrel type.
7 . The drilling and mining extender device of claim 1 , wherein the first coil is of an annular type and the second coil is of an annular type.
8 . The drilling and mining extender device of claim 1 , wherein the first tool and second tool mate together using a fixed and non-movable coupling.
9 . The drilling and mining extender device of claim 8 , wherein the fixed and non-movable coupling comprises a mechanical fastener.
10 . The drilling and mining extender device of claim 9 , wherein the fixed and non-movable coupling comprises at least one of screw threads, rivets, and welds.
11 . A drilling and mining (“D&M”) extender device for communicatively coupling two stationary tools in a bottom hole assembly of a drill string, the extender device comprising:
a first stationary coil associated with a first tool; and
a second stationary coil associated with a second tool;
wherein electrical transmissions between the first and second tools are transmitted wirelessly between the first and second stationary coils via inductive coupling between the coils; the first stationary coil positioned proximate to the second stationary coil, the first tool and second tool mate together using a fixed and non-movable coupling.
12 . The drilling and mining extender device of claim 11 , wherein the fixed and non-movable coupling comprises at least one of screw threads, rivets, and welds.
13 . The drilling and mining extender device of claim 11 , wherein the coils are inductively coupled such that: k=M/√{square root over (L 1 L 2 )}≦0.9, wherein k is the coupling coefficient of the coils, M is the mutual inductance between the coils, and L 1 and L 2 are the self-inductances of the respective coils; each coil is resonantly tuned with a capacitor such that: f 1 ≈f 2 , wherein
f
1
=
1
2
π
L
1
C
1
and
f
2
=
1
2
π
L
2
C
2
and f 1 and f 2 are the frequencies in Hertz of the respective coils, L 1 and L 2 are the self-inductances of the respective coils, and C 1 and C 2 are capacitances of tuning capacitors associated with the respective coils; and the coils have an associated figure of merit, U, such that: U=k√{square root over (Q 1 Q 2 )}≧3, wherein
Q
1
=
2
π
f
1
L
1
R
1
and
Q
2
=
2
π
f
2
L
2
R
2
and Q1 and Q2 are the quality factors associated with the respective coils, f 1 and f 2 are the frequencies in Hertz of the respective coils, L 1 and L 2 are the self-inductances of the respective coils, and R 1 and R 2 are the resistances of the respective coils.
14 . The drilling and mining extender device of claim 11 , wherein one or more of the electrical transmissions are selected from the group of power transmissions and data communication transmissions.
15 . The drilling and mining extender device of claim 11 , wherein the first coil is of a mandrel type and the second coil is of a annular type.
16 . The drilling and mining extender device of claim 11 , wherein the first coil is of a mandrel type and the second coil is of a mandrel type.
17 . The drilling and mining extender device of claim 11 , wherein the first coil is of an annular type and the second coil is of an annular type.
18 . A wireless coupling for drilling comprising:
a first stationary coil attached to a first drilling structure; and a second stationary coil attached to a second drilling structure; wherein electrical transmissions between the first and second coils are transmitted wirelessly via inductive coupling between the coils; the first stationary coil positioned proximate to the second stationary coil, the first drilling structure and second drilling structure being held in position with a fixed and non-movable fastening mechanism.
19 . The wireless coupling of claim 18 , wherein the fixed and non-movable fastening mechanism comprises at least one of screw threads, rivets, and welds.
20 . The wireless coupling of claim 19 , wherein the coils are inductively coupled such that: k=M/√{square root over (L 1 L 2 )}≦0.9, wherein k is the coupling coefficient of the coils, M is the mutual inductance between the coils, and L 1 and L 2 are the self-inductances of the respective coils; each coil is resonantly tuned with a capacitor such that: f 1 ≈f 2 , wherein
f
1
=
1
2
π
L
1
C
1
and
f
2
=
1
2
π
L
2
C
2
and f 1 and f 2 are the frequencies in Hertz of the respective coils, L 1 and L 2 are the self-inductances of the respective coils, and C 1 and C 2 are capacitances of tuning capacitors associated with the respective coils; and the coils have an associated figure of merit, U, such that: U=k√{square root over (Q 1 Q 2 )}≧3, wherein
Q
1
=
2
π
f
1
L
1
R
1
and
Q
2
=
2
π
f
2
L
2
R
2
and Q1 and Q2 are the quality factors associated with the respective coils, f 1 and f 2 are the frequencies in Hertz of the respective coils, L 1 and L 2 are the self-inductances of the respective coils, and R 1 and R 2 are the resistances of the respective coils.Join the waitlist — get patent alerts
Track US2014083770A1 — get alerts on status changes and closely related new filings.
We store only your email — no account needed. See our privacy policy.