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A process and apparatus for treating a wellbore, comprising subjecting a substantially same portion of the wellbore to vibratory waves produced by a plurality of vibratory wave generators. The vibratory waves may have about the same frequency or a plurality of frequencies, and the frequencies may pa

A process and apparatus for treating a wellbore, comprising subjecting a substantially same portion of the wellbore to vibratory waves produced by a plurality of vibratory wave generators. The vibratory waves may have about the same frequency or a plurality of frequencies, and the frequencies may partially overlap, not overlap, or be modulated across a range. Additionally, the frequencies may be modulated in an oval, hoop, and flexural modes. The vibratory waves may be produced by firing the vibratory wave generators simultaneously or in sequence. Combinations of a vibrating pipe, piston pulser, or valve may be used as vibratory wave generators. In a preferred embodiment, the thickness and change of thickness of a mudcake on the interior surface of a wellbore are measured to evaluate the effectiveness of the wellbore treatment.

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A process and apparatus for treating a wellbore, comprising subjecting a substantially same portion of the wellbore to vibratory waves produced by a plurality of vibratory wave generators. The vibratory waves may have about the same frequency or a plurality of frequencies, and the frequencies may pa

A process and apparatus for treating a wellbore, comprising subjecting a substantially same portion of the wellbore to vibratory waves produced by a plurality of vibratory wave generators. The vibratory waves may have about the same frequency or a plurality of frequencies, and the frequencies may partially overlap, not overlap, or be modulated across a range. Additionally, the frequencies may be modulated in an oval, hoop, and flexural modes. The vibratory waves may be produced by firing the vibratory wave generators simultaneously or in sequence. Combinations of a vibrating pipe, piston pulser, or valve may be used as vibratory wave generators. In a preferred embodiment, the thickness and change of thickness of a mudcake on the interior surface of a wellbore are measured to evaluate the effectiveness of the wellbore treatment. against the bias of the spring, when a handle of the hose reel is rotated to turn the drum in the first direction. 7. A hose reel according to claim 1, in which the reel includes a hose pipe wound around its drum. 8. A hose reel according to claim 1, in which the damper takes the form of a rotary dashpot having an outer casting mounted on the drum and an inner rotor which is rotatable with respect to the casing when the drum is rotated in the second direction. des dense phase CO2. 9. The pressure chamber assembly of claim 8 wherein the supply of CO2fluid is includes liquid CO2and/or supercritical fluid CO2. 10. The pressure chamber assembly of claim 9 wherein the means for providing the pressurized fluid is adapted to provide the CO2fluid in the pressure chamber at a pressure of at least 400 psi. 11. The pressure chamber assembly of claim 10 wherein the means for providing the pressurized fluid is adapted to provide the CO2fluid in the pressure chamber at a pressure of between about 800 psi and 3000 psi. 12. The pressure chamber assembly of claim 1 wherein the means for providing the pressurized fluid includes a tank containing a supply of pressurized fluid, the tank being fluidly connected to the pressure chamber. 13. The pressure chamber assembly of claim 12 wherein the means for providing a pressurized fluid includes a pump. 14. A pressure chamber assembly for processing a substrate, the pressure chamber assembly comprising: a) a pressure vessel defining an enclosed pressure chamber; b) a substrate holder disposed in the pressure chamber and adapted to hold the substrate; c) a magnetic drive assembly operable to move the substrate holder relative to the pressure vessel; and d) means for providing a pressurized fluid in the pressure chamber such that the pressurized fluid is pressurized to a pressure greater than ambient atmospheric pressure. 15. The pressure chamber assembly of claim 14 wherein the means for providing the pressurized fluid includes CO2fluid. 16. The pressure chamber assembly of claim 15 wherein the supply of CO2fluid includes dense phase CO2. 17. The pressure chamber assembly of claim 16 wherein the supply of CO2fluid includes liquid CO2and/or supercritical fluid CO2. 18. The pressure chamber assembly of claim 15 wherein the means for providing the pressurized fluid is adapted to provide the CO2fluid in the pressure chamber at a pressure of at least 400 psi. 19. The pressure chamber assembly of claim 18 wherein the means for providing the pressurized fluid is adapted to provide the CO2fluid in the pressure chamber at a pressure of between about 800 psi and 3000 psi. 20. The pressure chamber assembly of claim 14 wherein the means for providing the pressurized fluid includes a tank containing a supply of pressurized fluid, the tank being fluidly connected to the pressure chamber. 21. The pressure chamber assembly of claim 20 wherein the means for providing a pressurized fluid includes a pump. 22. A pressure chamber assembly for processing a substrate, the pressure chamber assembly comprising: a) a pressure vessel defining an enclosed pressure chamber and an exterior opening in fluid communication with the pressure chamber; b) a substrate holder disposed in the pressure chamber and adapted to hold the substrate; c) a drive assembly operable to non-mechanically move the substrate holder relative to the pressure vessel, the drive assembly including a housing covering the exterior opening of the pressure chamber so as to seal the exterior opening; and d) means for providing a pressurized fluid in the pressure chamber such that the pressurized fluid pressurized to a pressure greater than ambient atmospheric pressure. 23. The pressure chamber assembly of claim 22 wherein the drive assembly includes a drive member extending through the exterior opening and connected to the substrate holder. 24. The pressure chamber assembly of claim 22 wherein the means for providing the pressurized fluid includes a supply of CO2fluid. 25. The pressure chamber assembly of claim 24 wherein the supply of CO2fluid includes dense phase CO2. 26. The pressure chamber assembly of claim 25 wherein the supply of CO2fluid is includes liquid CO2and/or supercritical fluid CO 2. 27. The pressure chamber assembly of claim 24 wherein the means for providing the pressurized fluid is adapted to provide the CO2fluid in the pressure chamber at a pressure of at least 400 psi. 28. The pressure chamber assembly of claim 27 wherein the means for providing the pressurized fluid is adapted to provide the CO2fluid in the pressure chamber at a pressure of between about 800 psi and 3000 psi. 29. The pressure chamber assembly of claim 22 wherein the means for providing the pressurized fluid includes a tank containing a supply of pressurized fluid, the tank being fluidly connected to the pressure chamber. 30. The pressure chamber assembly of claim 29 wherein the means for providing a pressurized fluid includes a pump. 31. A pressure chamber assembly for processing a substrate, the pressure chamber assembly comprising: a) a pressure vessel defining an enclosed pressure chamber; b) a substrate holder disposed in the pressure chamber and adapted to hold the substrate; c) a drive assembly operable to move the substrate holder, the drive assembly including: a first drive member connected to the substrate holder for movement therewith relative to the pressure vessel; a second drive member fluidly isolated from the first drive member and the pressure chamber; and a drive unit operable to move the second drive member, wherein the drive unit is fluidly isolated from the first drive member and the pressure chamber; wherein the second drive member is non-mechanically coupled to the first drive member such that the drive unit can move the substrate holder via the first and second drive members; and d) a supply of CO2fluid fluidly connected to the pressure chamber. 32. The pressure chamber assembly of claim 31 including a tank containing the supply of CO2fluid such that the supply of CO2fluid within the tank is maintained at a pressure greater than ambient atmospheric pressure. 33. The pressure chamber assembly of claim 32 wherein the supply of CO2fluid within the tank includes dense phase CO2. 34. The pressure chamber assembly of claim 32 wherein the supply of CO2fluid within the tank is pressurized to a pressure of at least 400 psi. 35. A pressure chamber assembly for processing a substrate, the pressure chamber assembly comprising: a) a pressure vessel defining an enclosed pressure chamber; b) a substrate holder disposed in the pressure chamber and adapted to hold the substrate; c) a magnetic drive assembly operable to move the substrate holder relative to the pressure vessel; and d) a supply of CO2fluid fluidly connected to the pressure chamber. 36. The pressure chamber assembly of claim 35 including a tank containing the supply of CO2fluid such that the supply of CO2fluid within the tank is maintained at a pressure greater than ambient atmospheric pressure. 37. The pressure chamber assembly of claim 36 wherein the supply of CO2fluid within the tank includes dense phase CO2. 38. The pressure chamber assembly of claim 36 wherein the supply of CO2fluid within the tank is pressurized to a pressure of at least 400 psi. 39. A pressure chamber assembly for processing a substrate, the pressure chamber assembly comprising: a) a pressure vessel defining an enclosed pressure chamber and an exterior opening in fluid communication with the pressure chamber; b) a substrate holder disposed in the pressure chamber and adapted to hold the substrate; c) a drive assembly operable to non-mechanically move the substrate holder relative to the pressure vessel, the drive assembly including a housing covering the exterior opening of the pressure chamber so as to seal the exterior opening; and d) a supply of CO2fluid fluidly connected to the pressure chamber. 40. The pressure chamber assembly of claim 39 including a tank containing the supply of CO2fluid such that the supply of CO2fluid within the tank is maintained at a pressure greater than ambient atmospheric pressure. 41. The pressure chamber assembly of claim 40 wherein the supply of CO2fluid within the tank includes dense phase CO2. 42. The pressure chamber assembly of claim 40 wherein the supply of CO2fluid within the tank is pressurized to a pressure of at least 400 psi.