US1608169A

US1608169A - Rotary well-drilling machinery

Info

Publication number: US1608169A
Application number: US639928A
Authority: US
Inventors: Hayward John Thomson
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-05-18
Filing date: 1923-05-18
Publication date: 1926-11-23
Anticipated expiration: 1943-11-23

Description

Nov. 23 1926.

1.1", HAYWARD ROTARY WELL DRILLING MACHINERY Filed May 18. 1923 2 Sheets-Sheet 1 grweu l'oz 75in gamma); Hayward 0v 3 1926 J T. HAYWARD 1,608,169

ROTARY WELL DRILLING MACHINERY Filed May 18. 1923 2 Sheets-Sheet 2 IllIlllll'lllllllllllllflll'l (foil- 1 Tkomson Ha Patented Nov. 23, 1926.

UNITED STATES PATENT OFFICE.

ROTARY WELL-DRILLING- MACHINERY,

Application filedMay 1s,

The present invention has reference to improvements in rotary well drilling machinery and more particularly to apparatus "for automatically feeding down the bit and sult, whil if he is careful the rate of advance is liable to be below the maximum possible with the drill stem used.

The present invention, as described below, I

concerns apparatus which regulates the feed so that a constant and predetermined couple is maintained in the drill stem and whlch indicates this couple for the drillers information. The operation of the apparatus -is based upon the fact that in a steam driven rotary rig the couple in the drill stem is directly proportional to the mean efiective pressure in the engine cylinder. This M. E.

is of course, when the rig is running normally with the throttle partly open, somewhat less than the boiler pressure due to the wire-drawing or throttling efiect of the throttle valve.

The accompanying drawing Figure 1 shows a diagrammatic plan view of one method of carrying out the, invention, and Fig. 2 is a diagrammatic plan showing the line shaft and drum connected to the well known rotary table. v

Referring now to the drawing 1 is the usual drum, 2 the line shaft and 3 the engine.

An additional sprocket wheel 4 is mounted upon the drum shaft 5, to which it may be coupled or uncoupled as required by means of clutch member 6. This sprocket wheel is' driven by means of a chain 7 by the sprocket wheel 8 mounted upon the reduction gear 9 which in its turn is driven from the line shaft 2. This reduction gear is so desi ed that the sprocket wheel 8 revolves more ow- 1y than the belt pulleys 10 of the reduction gear, the gear in its turn being driven as follows :-A belt pulley 11 is mounted on the line shaft and carries two belts '12 and 13, the belt 12 bein shown as crossed which pass over a set 0 fixed and loose pulle s 10 mounted on the high speed shaft 21 o the 1923. Serial No. 639,928.

reduction gear. With the line shaft revolving in one direction by suitably moving the belts, the gear can be driven in either direction or left free with the belts on the loose pulleys. The belts are moved by shifting rod 14 operated by means of piston 15 operating in a cylinder 16. This piston is caused to move to the right depending upon the steam pressure supplied throu 7 11 the pipe 17 and to the left by any suitab e means such as a weight 18. Th pipe 17 is connected to the main engine in such a way that it is filled with steam at a pressure equal or proportional to the M. E. P. in the main engine cylinder. For this purpose it should of course be connected to both ends of the main engine cylinder or cylinders, but in practice, as drilling engines areusually run in full gear, that is, with constant outwit, it is found that the pipe 17 may be connected to the steam chest or to any part of the steam passage between the engine and the throttle.

A valve, not shown, ma be placed in this pipe and .partially close so as to damp out the cyclic pressure variations from the main engine and maintain a gil'essure on the piston 15 proportional to the E. P. This ressure may be indicated to the driller y a Bourdon gauge 19 mounted in a convenient position. The .dial 20 of this gauge could be marked in a suitable manner, for instance, in pounds-feet or kilogrammesemetres and could further have markings representing a. safe couple for different qualities and'dimensions of drill stem.

Fig. 2 shows theconnections between the line shaft and drum to the well known rotary table in which the frame 28 supports the rotary table 22 which is provided with teeth 24 on the under 'side as indicated by the dotted lines. B rotation of the drum 1 the drill stem 26 can be raised or lowered as the case may be by means of the cable or rope 23 secured to the drill at 27. Motion is imparted to the table by means of a chain 29 which receives its motion from the line shaft 2 by means of gear wheel 30. Chain 29 rotates gear wheel 31 which rotates the gear 25 thereby imparting motion to the table and drill by the meshing of teeth 24 of the table with the gear 25.

The operation of the machine'is' as follows: the bit is lifted a short distance from the bottom, the rotary table drive coupling thrown in and the coupling connecting the sprocket wheel 4 to the drum shaft engaged,

its

the throttle of the'main engine being opened until the table is running at a suitable speed. The weight 18 having; been suitably chosen, the piston 15 with its attached belt shifting rod will take up a position depending upon the M. E. P. in the main engine, that is, depending upon the load on the main engine. For example, should the bit meet with an obstruction by taking .too big a cut, the engine will be slowed down slightly, the M. E. P. will automatically rise and the belt that turns the reduction gear which operates to work the drum in the lifting direction will be moved on to the fixed pulley. In this way the bit will be automatically raised, to be automatically lowered as soon as the load on the engine ecreases. Should the couple in the drill stem continue to'rise in spite of the bit being lifted up, the piston 15 in its extreme position to the right can be arranged to throw out the-ta le coupling or shut off steam to the main engine.

It will be appreciated that the invention is not limited to the precise construction hereinbefore-described, for obviously many modifications may be made in the exact. details of the mechanical construction without departing from the scope of the present invention. For instance, the above description and drawing refer to the invention as applied to existing rotary machiner with only slight alterations. Should the raw-works be s ciall designed from the beginning, a [pee anica ly more plerfect apparatus could be incorporated wit them. For instance, the belts and ear might be replaced by a car and clutc es mounted directly on the 'ne or drum shaft. According to another feature of the invention thefeed could be controlled by an auxiliary steam engine geared to the drum and supplied with steam at line pressure but With Its retion of rotation cont'rolle similar to that described above ling the position of the belts.

' I claim as my invention 1. Drilling machinery comprising an o rating engine; a line shaft rotated by sai engine; a drum adapted to be operated from said line shaft; a belt pulley on said line bfy a device or controlshaft; a reduction gear adapted to c'ontrolsaid drum and having a plurality of ulleys; adplura 'ty of belts'on said belt pu ey and a apted to operate the plurality of pulleys of said reduction gear; and means responsive to the pressure of the operating medium of said engine for automatically shifting said belts in order to control the drum.

2. A controlling device for a drum of a machine comprising a reduction wer and digear having a plurality ,of pulleys thereon and adapted to drive said drum; means associated withsaid pulleys for driving the reduction gear; and means res onsive to the pressure of the o crating me ium of the engine of said drilling machine for controlling the lastnamed means for varying the speed and direction of rotation of said drum.

3. A controlling device for a drum comprising a line shaft operated by an engine; a reduction gear adaptedr'to control said drum; means for operating said reduction gear from said line shaft; a piston and cyl' 5. Drilling machinery comprising an en gine; a line shaft driven by said engine; a drum; a reduction gear driven by means of belts from said line shaft and adapted to drive said drum; a cylinder; a piston in said cylinder operatively connected to said belts; and means for communicating the pressure of the operatng medium of said engine to the cylinder in or er to shift said belts by means of said piston to thereby va the speed and direction of rotation of said rum. 6. Drilling machinery comprising an operating engine; a line shaft rotated by said engine; a drum adapted to be operated from said line shaft; a belt pulley on said line shaft; 9. reduction gear adapted to control said drum and having a plurality of pulleys; a plurality of belts on said belt pu ley and adapted to operate the plurality of pulleys of said reduction gear; and a piston and cylinder responsive to the pressure of the operating medium of said engine for automatically shifting said belts in order to control the drum.

7. Awcontrolling device for a drumeof a drillin machine comprising driving mechanism riven by an engine and adapted to drive said drum; and a piston and cylinder responsive to the ressure of the operating medium of the engine for operating and controlling said drivmg mechanism.

In testimony whereof I have signed my name to this specification.

JOHN THOMSON