RU97100732A

RU97100732A - SWIVEL DRILLING TOOL FOR DRILLING OIL, GAS AND GEOTHERMAL WELLS

Info

Publication number: RU97100732A
Application number: RU97100732/03A
Authority: RU
Inventors: Леруа Андре
Original assignee: Леруа Андре
Priority date: 1994-06-15
Filing date: 1995-06-14
Publication date: 1999-02-27

Claims

1. A drilling tool designed for drilling oil, gas or geothermal wells, driven into rotation by a drive unit, which also transfers the supply force to this tool, and the formation of two main organs, one of which is a hollow shaft (1) connected by one of its ends (3) to the said drive body, and the other is a blind tubular body (2) called a tool body, on the closed end of which there are outside cutting edges and the open end of which it provides the possibility of passing the aforementioned hollow shaft, and the aforementioned main organs of this drilling tool are in spherical communication, characterized in:
- the fact that the aforementioned hollow shaft transmits the drilling torque to the housing of the drilling tool using a so-called variable configuration transmission system containing between the said hollow shaft and the said tool body some intermediate element (6) in mechanical connection with each of the aforementioned main organs;
- the fact that the ball joint (4, 5), realizing a spherical connection between the mentioned main organs of the drilling tool, is placed at the very bottom of the blind part of the body of this tool;
- the fact that a stabilizer (19) is placed on said tool body, located at its open end at a distance from the center of said ball joint of at least 2.5 diameters of the outer part of the tool body;
- the fact that the said transmission system (6, 7, 8, 9, 11) of variable configuration is separated from the ball joint and is located on the same side of this ball joint as the stabilizer;
- as well as the fact that this system uses an intermediate element (6) to enclose the hollow shaft for transmitting drilling torque.

2. A drilling tool according to claim 1, characterized in that said spherical connection (4, 5) is located on the very bottom of the tool body, is one-sided, so that it is capable of transmitting only forces directed from the hollow shaft to the tool body in the direction of the feed movement, the center (A) of the ball joint that implements the said one-way spherical connection can thus be moved as far as possible in the feed direction of the drilling tool.

3. Drilling tools in accordance with paragraph 1, characterized in that:
- the aforementioned transmission system of variable configuration is formed by a sleeve (6) contained in the tool body (2) and bearing at one of its ends an internal straight gear ring (7), and at its other end an external convex ring gear (8);
- the fact that the inner straight gear ring (7) of this coupling is in gearing with the outer convex gear ring (9) with the number of teeth rigidly connected to said hollow shaft;
- as well as the fact that the outer toothed convex ring (8) is in gearing with the inner straight toothed ring (11) with the same number of teeth rigidly connected to the tool body so as to form a deformable connection between the hollow shaft and the tool body, moreover, the point additional support (12) of the coupling to one of the main organs of the drilling tool unilaterally limits the absolute translational movement of this coupling without limiting the relative degrees of freedom.

4. A drilling tool according to claim 1, characterized in that said stabilizer (19) located in the vicinity of the open end of the tool body is in rotational connection (20, 21) with said tool body.

5. A drilling tool according to claim 1, characterized in that the double deformable sealing system (15, 16) isolates between the hollow shaft and the tool body some oil chamber (17) containing a ball joint and a transmission connection, as well as the fact that said double sealing system is formed by a front membrane (15), which in a free state has a tubular shape with a flange located at one of its ends, and a part of this membrane having a tubular shape is inserted into the inner surface of the hollow shaft, and said flange of this membrane is inserted into the tool body and the rear membrane (16), the shape of which in the free state has the form of a truncated cone and which is connected with the outer surface of the hollow shaft (1) and with the inner surface of the tool body (2) so that its base of small diameter was located on the side of the open part of the tool body, and the fact that the tool body (2) at the height of the aforementioned rear membrane (16) of the hole (18), providing the ability to supply a flow rising upward inside the tool body of the drilling fluid, creating a washing effect along this rear membrane (16), which prevents the deposition of solid particles between the membrane and the tool body.