Tool driving or impacting – Impacting devices – Hammer head constitutes piston of drive motor
Patent
1997-04-11
1999-07-20
Smith, Scott A.
Tool driving or impacting
Impacting devices
Hammer head constitutes piston of drive motor
173218, 173222, 173 93, E21B 718, E21B 2100
Patent
active
059244984
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an improved design of a pressure amplifier or 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 may be, inter alia, 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 the surrounding rock.
2. Description of the Related Art
The invention can be regarded as a further development and improvement of structures being described in Norwegian Patent Specifications Nos. 169.088, 171.322, 171.323 and 171.325. Norwegian Patent 171.323 is particularly directed to a valve assembly for this type of pressure converter, which advantageously can be replaced by new and improved designs to be described in the following description.
SUMMARY OF THE INVENTION
These new designs involve, inter alia, less wear of vital valve parts and besides better reliability and safety under the extreme conditions that the structures are subjected to in actual practice.
As in the pressure converters according the above mentioned Norwegian Patent Specifications, the present invention takes its starting point in an arrangement comprising a reciprocating piston having a pressure stroke and a return stroke between opposite end positions in a cylinder, and being at one side (low pressure side) provided with a relatively large piston area which during the pressure stroke is subjected to the drilling fluid pressure in the drill pipe, a first opposite area and a second, opposite and relatively small piston area which during the pressure stroke generates an increased pressure in a smaller portion (high pressure side) of the drilling fluid flow, valve means for controlling drilling fluid flows to and from the piston, a channel for connecting a space in front of the first, opposite piston area to the annulus outside the drill pipe at least during the pressure stroke, a second channel with a check valve, connecting said high pressure side to a high pressure channel leading forward to the drill bit, and at least one additional channel being adapted to connect the low pressure side to the annulus outside the drill pipe during the return stroke.
As an important component in the solution according to the invention there is incorporated a hydraulic motor, and in this connection it is to be noted that hydraulic motors in principle are known for use at the lower end of drill pipes for deep drilling, as for example described in U.S. Pat. No. 3.112.800, European patent publication 335.543 and international patent publication WC 83/00183. In these known uses, however, the hydraulic motor has other purposes and functions than what is contemplated in connection with the present invention.
What is novel and specific in the pressure converter according to the invention in the first place comprises therein that it comprises a hydraulic rotary motor arranged beyond the end of the cylinder and adapted to be driven by the pressure difference between the drilling fluid flows in the drill pipe and the annulus, and that a transmission mechanism is adapted to convert the rotation of the hydraulic motor into intermittent re-positioning movements of the valve means between two operative positions.
The present invention provides a pressure converter for mounting above a drill bit at a lower end of a drill pipe for deep drilling and for generating fluid pressure higher than pressure in a drilling fluid flow downwards through a drill string and the drill pipe. The pressure converter includes a reciprocating piston having a pressure stroke and a return stroke between opposite end positions in a cylinder, and being provided at one side with a main piston area which during a pressure stroke is subjected to the drilling fluid pressure in the drill pipe, a first opposite piston area, an
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Den Norske Stats Oljeselskap A.S.
Smith Scott A.
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