IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0792298
(2010-06-02)
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등록번호 |
US-8757278
(2014-06-24)
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발명자
/ 주소 |
|
출원인 / 주소 |
- Halliburton Energy Services, Inc.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
78 |
초록
▼
Sneak path elimination in diode multiplexed control of downhole well tools. A system for selectively actuating multiple well tools includes a control device for each tool, a well tool being operable by selecting a respective control device; conductors connected to the control devices, which are sele
Sneak path elimination in diode multiplexed control of downhole well tools. A system for selectively actuating multiple well tools includes a control device for each tool, a well tool being operable by selecting a respective control device; conductors connected to the control devices, which are selectable by applying a predetermined voltage across a respective predetermined pair of the conductors; and at least one lockout device for each control device, the lockout devices preventing current from flowing through the respective control devices when voltage across the respective predetermined pair of the conductors is less than a predetermined minimum. A method includes selecting a well tools for actuation by applying a predetermined minimum voltage to a set of conductors; and preventing actuation of another well tool when the predetermined minimum voltage is not applied across another set of conductors, at least one conductor being common to the two sets of conductors.
대표청구항
▼
1. A system for selectively actuating from a remote location multiple downhole well tools in a well, the system comprising: first, second, and third conductors;a first control device which controls actuation of a first well tool, wherein the first control device is connected between the first and se
1. A system for selectively actuating from a remote location multiple downhole well tools in a well, the system comprising: first, second, and third conductors;a first control device which controls actuation of a first well tool, wherein the first control device is connected between the first and second conductors, and wherein the first control device is not electrically connected to the third conductor;a second control device which controls actuation of a second well tool, wherein the second control device is connected between the first and third conductors, and wherein the second control device is not electrically connected to the second conductor,whereby a respective one of the first and second control devices is selected by applying at least a predetermined minimum voltage potential across a respective pair of the conductors; andfirst and second lockout devices, whereby current is prevented from flowing through the second control device when the first control device is selected, and whereby current is prevented from flowing through the first control device when the second control device is selected. 2. The system of claim 1, wherein at least one of the lockout devices includes a relay with a switch, and wherein the relay closes the switch, thereby permitting current flow through the selected control device when the predetermined minimum voltage potential is applied across the respective pair of the conductors. 3. The system of claim 1, wherein at least one of the lockout devices includes a thyristor, and wherein the thyristor permits current flow from a source to a drain of the thyristor, thereby permitting current flow through the selected control device when the predetermined minimum voltage potential is applied across the respective pair of the conductors. 4. The system of claim 1, wherein at least one of the lockout devices includes a zener diode, and wherein current flows through the zener diode, thereby permitting current flow through the selected control device when the predetermined minimum voltage potential is applied across the respective pair of the conductors. 5. The system of claim 1, wherein at least one of the lockout devices includes a transistor, and wherein the transistor permits current flow from a source to a drain of the transistor, thereby permitting current flow through the selected control device when the predetermined minimum voltage potential is applied across the respective pair of the conductors. 6. The system of claim 1, wherein at least one of the lockout devices includes a relay with a switch, and wherein the switch remains open unless the predetermined minimum voltage potential is applied across the respective pair of the conductors. 7. The system of claim 1, wherein at least one of the lockout devices includes a thyristor, and wherein current is prevented from flowing unless the predetermined minimum voltage potential is applied across the respective pair of the conductors. 8. The system of claim 1, wherein at least one of the lockout devices includes a zener diode, and wherein current is prevented from flowing unless the predetermined minimum voltage potential is applied across the respective pair of the conductors. 9. The system of claim 1, wherein at least one of the lockout devices includes a transistor, and wherein current is prevented from flowing unless the predetermined minimum voltage potential is applied across the respective pair of the conductors. 10. A method of selectively actuating from a remote location multiple downhole well tools in a well, the method comprising the steps of: connecting a first control device of a first well tool between first and second conductors, wherein the first well tool is selected for actuation via the first and second conductors;connecting a second control device of a second well tool between the first conductor and a third conductor, wherein the second well tool is selected for actuation via the first and third conductors;selecting a respective one of the first and second well tools for actuation by applying at least a predetermined minimum voltage potential across a respective pair of the conductors; andproviding first and second lockout devices, thereby fully preventing current flow through the first control device of the first well tool when the second well tool is selected for actuation, and thereby fully preventing current flow through the second control device of the second well tool when the first well tool is selected for actuation. 11. The method of claim 10, wherein the selecting step further comprises permitting current flow through the respective control device of the selected well tool when the predetermined minimum voltage potential is applied across the respective pair of the conductors. 12. The method of claim 11, wherein the current flow permitting step further comprises actuating a relay to thereby close a switch, thereby permitting current flow through the respective control device when the predetermined minimum voltage potential is applied across the respective pair of the conductors. 13. The method of claim 11, wherein the current flow permitting step further comprises permitting current flow from a source to a drain of a thyristor, thereby permitting current flow through the respective control device when the predetermined minimum voltage potential is applied across the respective pair of the conductors. 14. The method of claim 11, wherein the current flow permitting step further comprises permitting current flow through a zener diode, thereby permitting current flow through the respective control device when the predetermined minimum voltage potential is applied across the respective pair of the conductors. 15. The method of claim 11, wherein the current flow permitting step further comprises permitting current flow from a source to a drain of a transistor, thereby permitting current flow through the respective control device when the predetermined minimum voltage potential is applied across the respective pair of the conductors.
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