초록 ▼

A pressure pulse generator for a downhole drilling tool is provided. The pressure pulse generator includes a stator with an orifice through which a stream of fluid passes, and a rotor intended to rotate opposite the stator to allow the flow of more or less liquid exiting the orifice of the stator. T

A pressure pulse generator for a downhole drilling tool is provided. The pressure pulse generator includes a stator with an orifice through which a stream of fluid passes, and a rotor intended to rotate opposite the stator to allow the flow of more or less liquid exiting the orifice of the stator. The rotor is equipped with an orifice, and the two orifices present a communicating area for the passage of the stream of fluid. The rotor is capable of passing fluid therethrough. A turbine with blades rotatable in response to fluid flow through the rotor may also be provided. The turbine is operatively connected to the rotor via a drive shaft. The fluid flow through the rotor may be used to rotate the turbine and provide power usable in the downhole tool.

대표청구항 ▼

1. A pressure pulse generator comprising:a stator with a stator orifice intended for the passage of a stream of fluid; anda rotor adapted to rotate opposite the stator for selectively permitting the flow of fluid existing the orifice of the stator to pass through the rotor, the rotor equipped with a

1. A pressure pulse generator comprising:a stator with a stator orifice intended for the passage of a stream of fluid; anda rotor adapted to rotate opposite the stator for selectively permitting the flow of fluid existing the orifice of the stator to pass through the rotor, the rotor equipped with a rotor orifice, the orifices defining a communicating area for the passage of the stream of fluid, the communicating area having a section located in a central area of the stator-rotor assembly; anda turbine operatively connected to the rotor, the turbine having blades rotatable in response to the flow of fluid through the rotor.2. The pressure pulse generator according to claim 1, wherein the communicating area varies between a minimum area and a maximum area depending on the position of the rotor with respect to the stator.3. The pressure pulse generator according to claim 2, wherein the amplitude of the pressure pulses is determined by the difference between the maximum area and the minimum area.4. The pressure pulse generator according to claim 1, wherein the communicating area varies in basically a sinusoidal manner.5. The pressure pulse generator according to claim 4, wherein the section of the communicating area is located in the central area of the stator-rotor assembly regardless of the position of the rotor with respect to the stator.6. The pressure pulse generator according to claim 1, wherein the communicating area has a section located in a central area of the stator-rotor assembly regardless of the position of the rotor with respect to the stator.7. The pressure pulse generator according to claim 1, wherein the stator orifice has a central section located in a central area of the stator and at least one lobe that communicates with the central section.8. The pressure pulse generator according to claim 6, wherein the rotor orifice has a central section located in a central area of the rotor and at least one lobe that communicates with the central section.9. The pressure pulse generator according to claim 7, wherein at least one of the central sections is circular.10. The pressure pulse generator according to claim 7, wherein at least one of the lobes is part of a sector of a circle.11. The pressure pulse generator according to claim 7, wherein at least one of the lobes is part of a trapezoid.12. The pressure pulse generator according to claim 7, wherein the number of lobes of at least one of the orifices contributes to determining a period of the pressure pulses.13. The pressure pulse generator according to claim 7, wherein at least one of the orifices is rectangular.14. The pressure pulse generator according to claim 7, wherein the at least one of the orifices is centered.15. The pressure pulse generator according to claim 7, wherein at least one of the orifices has the shape of a cross.16. The pressure pulse generator according to claim 1, wherein the pressure pulses are sinusoidal when the rotor is rotating at constant speed.17. The pressure pulse generator according to claim 1, wherein the rotor in rotation applies a force to debris contained in the fluid that pushes the debris towards the communicating area.18. The pressure pulse generator according to claim 1, wherein the pressure pulse generator is contained in a logging-while-drilling tool.19. The pressure pulse generator according to claim 1, wherein the pressure pulse generator is contained in a measuring-while-drilling tool.20. The pressure pulse generator according to claim 1, wherein the pressure pulse generator is contained in a telemetry system.21. The pressure pulse generator according to claim 1, wherein the pressure pulses are non-sinusoidal when the rotor is rotating at constant speed.22. The pressure pulse generator according to claim 1, wherein the pressure pulses are sinusoidal.23. The pressure pulse generator according to claim 22, wherein the orifice is non optimized.24. The pressure pulse generator according to claim 23 wherein the speed is varied over each period of rotation.25. The pressure pulse generator according to claim 1, wherein the turbine is connected to the rotor via a drive shaft.26. The pressure pulse generator according to claim 1, wherein the turbine has a plurality of blades.27. The pressure pulse generator of claim 26 wherein the blades are curved.28. The pressure pulse generator of claim 26 wherein the rotor has a plurality of exit ports, each blade aligned with a corresponding port.29. The pressure pulse generator of claim 26 wherein the turbine is positioned downstream of the rotor.30. A pressure pulse generator for a downhole drilling tool, the downhole drilling tool having a fluid passing therethrough, the pressure pulse generator comprising:a stator having a stator orifice adapted to permit the fluid to flow therethrough, the stator orifice defining a plurality of stator lobes;a rotor positioned adjacent the stator orifice, the rotor having a rotor orifice defining a plurality of rotor lobes of corresponding dimension to the stator lobes, the rotor adapted to rotate with respect to the stator such that the fluid selectively passes therethrough, the rotor having a channel therethrough and at least one port to permit the fluid to exit, anda turbine connected to the rotor, the turbine having at least one blade, the turbine rotationally driven by the flow of fluid from the at least one port and over the at least one blade whereby power is provided to the downhole tool.31. The pressure pulse generator of claim 30 wherein the stator and rotor have two lobes.32. The pressure pulse generator of claim 30 wherein the stator and rotor have three lobes.33. The pressure pulse generator of claim 30 wherein the power is mechanical.34. The pressure pulse generator of claim 30 wherein the turbine is connected to the rotor by a drive shaft.35. A method of generating power in a downhole tool, comprising:selectively passing a fluid through an orifice of a stator and a corresponding orifice of a rotor in the downhole tool;passing the fluid through a rotor and out exit ports therein; andgenerating rotational energy by passing the fluid from the exit ports over at least one turbine blade of a turbine operatively connected to the rotor.36. The method of claim 35 wherein the step of passing the fluid through the modulator comprises:separating the flow of fluid by passing fluid through a rotor and out exit ports therein.37. The method of claim 35 wherein the power is mechanical.