IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0851183
(2007-09-06)
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등록번호 |
US-7730970
(2010-06-29)
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발명자
/ 주소 |
- Fincher, Roger W.
- Watkins, Larry A.
- Aronstam, Peter
- Sinor, Allen
- Baugh, John L.
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출원인 / 주소 |
- Baker Hughes Incorporated
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
1 인용 특허 :
27 |
초록
▼
A device and system for improving efficiency of subterranean cutting elements uses a controlled oscillation super imposed on steady drill bit rotation to maintain a selected rock fracture level. In one aspect, a selected oscillation is applied to the cutting element so that at least some of the stre
A device and system for improving efficiency of subterranean cutting elements uses a controlled oscillation super imposed on steady drill bit rotation to maintain a selected rock fracture level. In one aspect, a selected oscillation is applied to the cutting element so that at least some of the stress energy stored in an earthen formation is maintained after fracture of the rock is initiated. Thus, this maintained stress energy can thereafter be used for further crack propagation. In one embodiment, an oscillation device positioned adjacent to the drill bit provides the oscillation. A control unit can be used to operate the oscillation device at a selected oscillation. In one arrangement, the control unit performs a frequency sweep to determine an oscillation that optimizes the cutting action of the drill bit and configures the oscillation device accordingly. One or more sensors connected to the control unit measure parameters used in this determination.
대표청구항
▼
The invention claimed is: 1. An apparatus for controlling at least one cutting element used to form a wellbore in a subterranean formation, comprising: at least one cutting element on a drill bit for forming a wellbore in an earthen formation, the drill bit having a constant rotational speed; an os
The invention claimed is: 1. An apparatus for controlling at least one cutting element used to form a wellbore in a subterranean formation, comprising: at least one cutting element on a drill bit for forming a wellbore in an earthen formation, the drill bit having a constant rotational speed; an oscillation device oscillating the at least one cutting element; and a control unit coupled to the oscillation device, the control unit configured to process data and provide a signal to control the oscillation device, the signal causing the oscillation device to accelerate the at least one cutting element to at least maintain contact between the at least one cutting element and the formation. 2. The apparatus according to claim 1, wherein the control unit is configured to operate the oscillation device over a specified range of oscillation frequencies. 3. The apparatus according to claim 2, wherein the control unit includes a processor programmed with instructions for determining an optimal oscillation based on data received from at least one sensor. 4. The apparatus according to claim 1, wherein the control unit is configured to (i) operate the oscillation device over a range of oscillation frequencies while receiving data from at least one sensor, and (ii) select an oscillation frequency for the oscillation device based on data received from the at least one sensor. 5. The apparatus according to claim 4, wherein the at least one sensor comprises a plurality of sensors distributed along a drill string on which the at least one cutting element is disposed. 6. The apparatus according to claim 1, wherein the oscillation device accelerates the at least one cutting element in a forward direction and returns the at least one cutting element to no further than a neutral position. 7. The apparatus according to claim 1, wherein the oscillation device is configured to transmit a selected vibration to the at least one cutting element, the selected vibration being present in one of (i) a drill string rotating the at least one cutting element, and (ii) a bottomhole assembly coupled to the at least one cutting element. 8. The apparatus according to claim 1, wherein the oscillation device is positioned at one of (i) along a drill string, (ii) at a bottomhole assembly coupled to the at least one cutting element; and (iii) a body of the drill bit having the at least one cutting element. 9. A method for controlling at least one cutting element used to form a wellbore in a subterranean formation, comprising: forming a wellbore in an earthen formation using the at least one cutting element formed on a drill bit; rotating the drill bit at a constant rotational speed; oscillating the at least one cutting element using an oscillation device; coupling a control unit to the oscillation device, the control unit configured to process data; and controlling the oscillation device using a signal from the control unit, the signal causing the oscillation device to accelerate the at least one cutting element to at least maintain contact between the at least one cutting element and the formation. 10. The method according to claim 9, further comprising operating the oscillation device over a specified range of oscillation frequencies. 11. The method according to claim 10, further comprising determining an optimal oscillation based on data received from at least one sensor. 12. The method according to claim 9, further comprising operating the oscillation device over a range of oscillation frequencies while receiving data from at least one sensor, and selecting an oscillation frequency for the oscillation device based on data received from the at least one sensor. 13. The method according to claim 12, wherein the at least one sensor comprises a plurality of sensors distributed along a drill string on which the at least one cutting element is disposed. 14. The method according to claim 9, further comprising accelerating the at least one cutting element in a forward direction and returning the at least one cutting element to no further than a neutral position. 15. The method according to claim 9, further comprising transmitting a selected vibration to the at least one cutting element, the selected vibration being present in one of (i) a drill string rotating the at least one cutting element, and (ii) a bottomhole assembly coupled to the at least one cutting element. 16. The method according to claim 9, further comprising positioning the oscillation device at one of (i) along a drill string, (ii) at a bottomhole assembly coupled to the at least one cutting element; and (iii) a body of a drill bit having the at least one cutting element. 17. A system for forming a subterranean wellbore, comprising: a rig positioned at a surface location; a drill string conveying a bottomhole assembly into the wellbore from the rig; a drill bit provided in the bottomhole assembly, the drill bit having at least one cutting element for forming a wellbore in an earthen formation; an oscillation device oscillating the at least one cutting element; and a control unit coupled to the oscillation device, the control unit configured to process data and provide a signal to control the oscillation device, the signal causing the oscillation device to accelerate the at least one cutting element to at least maintain contact between the at least one cutting element and the formation. 18. The system according to claim 17, wherein the control unit is configured to operate the oscillation device over a specified range of oscillation frequencies. 19. The system according to claim 17, further comprising at least one sensor positioned along the drill string, and wherein the control unit includes a processor programmed with instructions for determining an optimal oscillation based on data received from the at least one sensor. 20. The apparatus according to claim 19, wherein the control unit is configured to operate the oscillation device over a range of oscillation frequencies while receiving data from the at least one sensor. 21. The system according to claim 17, wherein the oscillation device is configured to transmit a selected vibration to the at least one cutting element, the selected vibration being present in one of (i) a drill string rotating the at least one cutting element, and (ii) a bottomhole assembly coupled to the at least one cutting element. 22. The system according to claim 17, wherein the oscillation device is positioned at one of (i) along the drill string, (ii) at the bottomhole assembly, and (iii) in the drill bit.
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