Pressure converter

Boring or penetrating the earth – With below-ground tool drive prime mover – Below-ground storage of motivating energy

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Details

175107, 175324, E21B 402

Patent

active

053618572

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to an improved design of a 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, for the purpose of generating an increased fluid pressure by utilizing energy in a drill fluid flow downwards through the drill pipe.
The object of the invention is to provide improvements in a pressure converter of the kind being subject to the applicant's international patent application PCT/NO90/00164, whereby it has been found possible to obtain more advantageous solutions in certain important parts of the design.
Various proposals are previously known for such utilization of the drill fluid flow, in particular in order to obtain an enhanced or more efficient drill operation. An example of such known techniques is to be found in the international patent application, PCT/EP82/00147. This example relates to the employment of an impact effect brought about with the drill fluid flow as a source of energy, so as to enhance the drilling action.
Of particular interest to the present invention is the employment of one or more high pressure jets adapted to make the drilling more effective by providing a cutting action in a surrounding rock formation. This is also previously known per se, inter alia from U.S. Pat. No. 3,112,800, which describes a method including the use of a pressure converter apparatus for generating the required high pressure. The invention, however, is directed to a novel design of a pressure converter for generating the required high fluid pressure.
International patent application PCT/NO90/00164 relates to a pressure converter comprising drive means adapted to be driven by the drilling fluid flow and to move valve means controlling piston means for reciprocating movement with a pressure stroke and a return stroke, said piston means having at one side a relatively large piston area adapted to be subjected to the drilling fluid pressure in the drill pipe during the pressure stroke, and having at the other side a first, opposite piston area which both during the pressure stroke and the return stroke is subjected to the return pressure in the drilling fluid flow upwards outside the drill pipe, and a second, opposite and relatively small piston area which during the pressure stroke is adapted to generate an increased pressure in a smaller portion of the drilling fluid flow, whereby a check valve provides for discharge of this smaller portion of the flow to a header channel which leads forward to the drill bit, whereas the large piston area during the return stroke is adapted to be subjected to the return pressure outside the drill pipe and the small piston area to the pressure in the drill pipe.


SUMMARY OF THE INVENTION

The present invention aims at the attainment of an improved design of certain essential parts in a pressure converter of the kind referred to above. It is particularly an object of this invention to provide a pressure converter in which the valve means and cooperating structural parts have a more simple design and at the same time are more reliable and dependable than the earlier proposed solution. Such properties are of much significance under the rough environments in which these pressure converters shall operate.
According to the invention this is obtained thereby that the valve means has the form of a rotatable valve body the axis of rotation of which is parallel to or coincident with the axis of the piston means, and which is arranged in a top cover above the space in front of the large piston area, that the valve body has a diametrical through passage and a central opening from the passage into the piston space, that the top cover has an inlet and an outlet respectively, being pairwise diametrically opposed and adapted to communicate with the passage in different angular positions of the valve body.
As will be seen from the following description, this solution implies that the complete valve system can be built up without seals and is symmetrically balanced wi

REFERENCES:
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patent: 3112800 (1963-12-01), Bobo
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patent: 4200158 (1980-04-01), Perkins
patent: 4253530 (1981-03-01), Sharki et al.
patent: 5246080 (1993-09-01), Horvei et al.

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