Boring or penetrating the earth – With below-ground tool drive prime mover – Below-ground storage of motivating energy
Patent
1997-09-30
1999-08-24
Schoeppel, Roger
Boring or penetrating the earth
With below-ground tool drive prime mover
Below-ground storage of motivating energy
175107, E21B 400
Patent
active
059413255
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an improved design of a pressure amplifier or pressure converter for mounting above the drill bit at the lower end of a drill pipe for deep drilling, in particular for oil and gas, and for generating an increased fluid pressure by utilizing energy in a drilling fluid flow downwards through the drill string and the drill pipe. This can be done for the purpose of obtaining an enhanced drilling effect, preferably by means of one or more high pressure jets adapted to have a cutting effect in a surrounding rock formation.
2. Description of the Related Art
The invention can be considered as a further development and improvement of structures described in Norwegian patent specifications Nos. 169.088, 171.322, 171.323 and 171.325. It has now been found that these and other known pressure converters advantageously can be replaced by or modified into new and improved designs to be described in the following description. These new designs involve among other things, an improved reliability and a reduced wear and tear of important parts of the pressure converters.
SUMMARY OF THE INVENTION
Like the pressure converters according to the above Norwegian patent specifications, the present invention as a starting point takes an embodiment comprising a reciprocating piston which is moveable under the influence of drilling fluid pressure, between opposite end positions in a cylinder. At one side the piston has a relatively large piston area which during piston movement in a first direction is influenced by the drilling fluid pressure in the drill pipe, and an oppositely facing, relatively small piston area, which during piston movement in the first direction generates an increased pressure in a smaller portion of the drilling fluid flow. Valve means control the movement of the piston in the cylinder, and conduits are provided to communicate with drilling fluid flow passages within the drill pipe and the annulus outside the drill pipe, where the drilling fluid has a relatively low pressure. A high pressure conduit with a check valve connects the space in front of the small piston area to a header conduit for drilling fluid at the increased pressure.
What is novel and specific to the pressure converter according to the invention in the first place consists therein that the space in front of the small piston area is adapted to receive a particular working fluid and that there is provided a moveable membrane for separating between the working fluid and the drilling fluid.
BRIEF DESCRIPTION OF THE DRAWINGS
The novel structural solutions according to the invention as well as additional advantages and particular features thereof, shall be explained more closely in the following description with reference to the drawings, where:
FIG. 1 in longitudinal section shows a first embodiment of a pressure converter according to the invention, with the piston in an upper end position, and
FIG. 2 in longitudinal section shows another embodiment of the pressure converter according to the invention, with the piston in an upper end position.
DESCRIPTION OF SPECIFIC EMBODIMENTS
Since the present pressure converter as far as the main features thereof are concerned, is closely related to corresponding structures according to the Norwegian patent specifications referred to above, it seems sufficient here only briefly to discuss these main features and functions.
As in the previously proposed structures the embodiment of FIG. 1 comprises as substantially cylindrical housing 1, 2, 3 adapted to enclose a piston 6. This has several active piston areas here, i.e. in the first place an upper relatively large piston area 11, a second and opposite large piston area 13 and an opposite, relatively small piston area 12 at the lower end of piston member 6. This is adapted to be freely moveable axially under the influence of varying drilling fluid pressures at the respective piston areas.
The space or volume in front of piston area 11 can be designated low pressure space, wh
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patent: 5246080 (1993-09-01), Horvei et al.
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patent: 5577564 (1996-11-01), Le
Andersen Tore
B.ae butted.kken Asbj.o slashed.rn
Skaar Jan
Str.o slashed.mm Sigmunn
Den Norske Stats Oljeselskap A.S.
Schoeppel Roger
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