A buffering device for use in conjunction with a downhole tool string, wherein the tool string includes a ballistics device. The buffering device includes a mandrel attached within a tool string and proximate to the ballistics device. An anchor is disposed on the mandrel and a disk plate is coaxiall
A buffering device for use in conjunction with a downhole tool string, wherein the tool string includes a ballistics device. The buffering device includes a mandrel attached within a tool string and proximate to the ballistics device. An anchor is disposed on the mandrel and a disk plate is coaxially placed on the mandrel that is slideable thereon. The disk plate is proximate to the ballistic device. A resilient member, such as a spring, is coaxially placed on the mandrel between the disk plate and the anchor. The pressure wave produced by activation of the ballistic device pushes the disk plate toward the anchor and compresses the spring there between. Since the disk plate extends outward into sealing contact with casing lining the wellbore, compression of the spring dissipates energy waves produced by activation of the ballistic device.
대표청구항▼
What is claimed is: 1. A wellbore tool string comprising: a ballistics device; a downhole tool; and a first buffering device disposed between the ballistics device and the downhole tool, the buffering device comprising a mandrel coaxial with the tool string, an anchor attached to the mandrel, a dis
What is claimed is: 1. A wellbore tool string comprising: a ballistics device; a downhole tool; and a first buffering device disposed between the ballistics device and the downhole tool, the buffering device comprising a mandrel coaxial with the tool string, an anchor attached to the mandrel, a disk assembly slidably disposed on the mandrel between the anchor and the ballistics device, a seal radially extending from the disk assembly, so that when the tool string is placed in a wellbore, the seal is in sealing contact with an inner surface of the wellbore, and a resilient device between the anchor and the disk assembly. 2. The tool string of claim 1, wherein the resilient device is selected from the list consisting of a spring and a fluid filled cylinder. 3. The tool string of claim 2, wherein the spring circumscribes the mandrel. 4. The tool string of claim 1, wherein the resilient device comprises multiple springs substantially parallel with the mandrel. 5. The tool string of claim 1 further comprising a second buffering device substantially the same as the first buffering device and disposed proximate to the end of the ballistics device opposite the first buffering device. 6. The tool string of claim 5 further comprising a second downhole tool, wherein the second buffering device is disposed between the ballistics device and the second downhole tool. 7. The tool string of claim 1, wherein the ballistics device is selected from the list consisting of a perforating gun, downhole explosive cutter, string shot, back-off shot, and other pipe recovery ballistic tool. 8. The tool string of claim 1, wherein the disk assembly is responsive to a ballistic event from the ballistics device and urgeable against the resilient member thereby storing energy in the resilient member. 9. The tool string of claim 1 wherein the downhole tool is selected from the list consisting of a ballistics device, a freepoint tool, pipe recovery log, casing inspection, pressure gauges, production logging tools, or other diagnostic and monitoring services. 10. A buffer assembly for use with a downhole ballistic device comprising: a mandrel; an anchor affixed to the housing; a disk assembly slideable on the mandrel and moveable towards the anchor in response to an energy wave produced by activation of the ballistic device; a seal radially extending from the disk assembly, so that when the mandrel is placed in a wellbore, the seal is in sealing contact with an inner surface of the wellbore, a resilient member disposed between the anchor and the disk assembly, the resilient member formed to store and/or disrupt energy therein. 11. The buffer assembly of claim 10, further comprising an attached ballistics device having a first end and a second end, and attached to the buffer assembly on its first end. 12. The buffer assembly of claim 11, wherein the disk assembly comprises a compression plate in engaging contact with the resilient member, a pressure plate between the compression plate and the ballistics device, and a seal between the compression plate and the pressure plate. 13. The buffer assembly of claim 10, wherein the resilient member is selected from the list consisting of a spring member and a piston housed in a cylinder with fluid. 14. The buffer assembly of claim 11, further comprising a second buffer assembly attached to the ballistics device second end. 15. The buffer assembly of claim 11 further comprising a downhole tool attached to the buffer assembly on an end opposite the ballistics device. 16. A method of perforating within a wellbore comprising: providing a ballistics device in a wellbore, having; a disk slideable with respect to the ballistics device with a pressure seal that radially extends outward from the disk on opposing ends of the ballistics device; and activating the ballistics device thereby producing an energy wave in the wellbore, so that when the energy wave contacts the pressure seal, the pressure seal resiliently contracts and stores energy from the energy wave in the resilient pressure seal threrby dissipating the energy wave. 17. The method of claim 16, wherein the pressure seal comprises a disk assembly, a seal radially extending outward from the disk assembly, and a resilient member coaxial with the disk assembly. 18. The method of claim 17, further comprising disposing a downhole tool in the wellbore that is selected from the list consisting of a ballistics device, a freepoint tool, pipe recovery log, casing inspection, pressure gauges, production logging tools, or other diagnostic and monitoring services.
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이 특허에 인용된 특허 (4)
Timothy Edward Lagrange CA; Andrew Antoine Buzinsky CA; David O. Carlson CA, Downhole shock absorber.
Grove,Brenden M.; Behrmann,Lawrence A.; Walton,Ian C.; Kneisl,Philip; Werner,Andrew T., Method and apparatus for reducing pressure in a perforating gun.
Miszewski Antoni K. L. (Missouri City TX) Huber Klaus B. (Sugar Land TX), Shock energy absorber including collapsible energy absorbing element and break up of tensile connection.
Rodgers, John P.; Glenn, Timothy S.; Eaton, Edwin A.; Walter, Patrick L.; Serra, Marco; Burleson, John D.; Hales, John H., Protection of electronic devices used with perforating guns.
Glenn, Timothy S.; Rodgers, John P.; Nelson, Jeff A.; Burleson, John D.; Serra, Marco; Hales, John H., Shock load mitigation in a downhole perforation tool assembly.
Glenn, Timothy S.; Rodgers, John P.; Nelson, Jeff A.; Burleson, John D.; Serra, Marco; Hales, John H., Shock load mitigation in a downhole perforation tool assembly.
Glenn, Timothy S; Rodgers, John P; Nelson, Jeff A; Burleson, John D; Serra, Marco; Hales, John H, Shock load mitigation in a downhole perforation tool assembly.
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