Gyratory hydraulic motor

 

(57) Abstract:

The invention relates to the field of drilling directional wells by drilling hydraulic motor. The invention consists in that the working fluid is supplied to the bearings of the spindle to screw channels of elastic sliding bearing, throttled and is admixed to the fluid flow in the channels of the adapter and provides cooling supports rotation and damping stresses from bending and torque transmitted from the planetary motion of the rotor to the stator via the drive shaft sections and couplings, as well as reactive bending moment due to the cutting forces on the bit. The invention provides improved precision drilling wells and reliability in the operation of the engine. 1 C.p. f-crystals, 6 ill.

The invention relates to hydraulic actuators for rotary movement, in particular, to devices for drilling directional wells in earth formations.

Known downhole motor for directional drilling, comprising a motor section, a rotor and a torsion bar which is connected at its upper part, and a spindle section, a case which the decomposition is the lack of devices for secure retention of the bit when breaking (cutting) of the spindle shaft, and devices for cooling the bearings of the spindle wash mud, perform the function of damping stresses from bending and torque transmitted from the motor rotor, and reactive bending moment due to the cutting forces on the bit. It is not possible to optimize the process parameters of drilling and to reduce accidents in the production and operation of slant wells.

Closest to the claimed design is a gerotor hydraulic motor (type "Moineau"), containing a hollow body placed inside multiple gyratory mechanism comprising coaxially located stator and mounted inside the stator, the rotor and the spindle including a spindle shaft is placed in the bearings of the rotation of the spindle body and coupled to the input drive shaft with the rotor, and the output from the bit and the motor housing and the spindle are connected by a bent sub with threads at its edges [2].

Famous invention includes a stabilizer with variable geometry, including remote control, contributing to the geometry changes under the influence of hydrostatic pressure in the drill string.

The disadvantage of the invention is the absence of reliable devices for keeping bits 47 at destruction (cutting) of the area outside poles of rotation on the slave (low-speed) shaft 46.

In addition, the lack of the invention is the lack of cooling for the bearings of the shaft 46 (spindle Assembly or gearbox) a countercurrent method, i.e., the flow of operating fluid from the bit 47 upward through the flow limiter, which would perform the function of damping vibration stresses from the planetary motion of the rotor 91 in the stator 90 and reactive bending moment due to the cutting force on the bit 47.

This reduces the possibility of using well-known inventions, and does not allow to optimize the process parameters of drilling in the production of directional wells with curved subs between the downhole motor and the spindle. In addition, the invention does not allow to reduce the cost, complexity and accidents in the manufacture and operation of slant wells increases the likelihood of irreversible attachment of the cost and complexity of maintenance works, associated with the disconnection and installation of the bent sub. Another technical challenge is to improve the accuracy of drilling a well, due to the damping torque and bending moments of the rotor of the downhole motor, as well as reactive bending moment due to the cutting force on the bit flow limiter made in the form of elastic sliding bearing with helical channels directed against the rotation of the spindle shaft.

Another technical problem is to increase the reliability of the drive shaft and provide sealing elements of the coupling of the rotor and the spindle, as well as reducing the likelihood of irreparable loss of the bit in the borehole.

The essence of the technical solutions is that in a gerotor hydraulic motor, containing a hollow body placed inside multiple gyratory mechanism comprising coaxially located stator and mounted inside the stator, the rotor and the spindle including a spindle shaft is placed in the bearings of the rotation of the spindle body and coupled to the input drive shaft with the rotor, and the output from the bit and the motor housing and the spindle are connected by a bent sub with resilence edge covering a gap spindle shaft and the spindle shaft has a circumferential collar located between the support rotation and a circumferential edge, with a circumferential collar on the shaft of the spindle and the circular edge in the spindle body made according to the type of continuous mating between a chamfer, the direction of screwing of the shaft and the housing of the spindle opposite to the direction of rotation of the spindle shaft, and the shortest distance between the edges of the ribs on the shaft and in the housing of the spindle equal to the step edges, while the drive shaft is movable between a bent sub and the engine, place the coupling of the sections made in the form of surfaces of solids of revolution about the common axis of the motor and spindle, and the spindle body-side connection with a curved sub contains a flow limiter made in the form of elastic sliding bearing with helical channels directed against the rotation of the spindle shaft.

In addition, according to the invention, the spindle shaft and the rotor are connected with each corresponding section of the drive shaft by a clutch, allowing angular misalignment, such as propeller-ball, and contains a flexible casing and a pair of rings coaxially covering the inside and outside edge of the casing and scriptmaster coupling without disturbing the integrity of the enclosure.

The execution of the body of the spindle from its end directed to the bit, with the County edge covering with a clearance of the spindle shaft and the spindle shaft with the district collar disposed between the support rotation and a circumferential rib in the housing ensures reliable retention of the bit when breaking (cutting) of the spindle shaft.

The implementation of the district collar on the shaft of the spindle, and the district of edges in the spindle body type continuous mating between a chamfer is achieved by executing the body of the spindle integral, without folding threaded pins, increases the reliability of the device, eliminates threaded connections, which can turn in the destruction of the spindle shaft.

Opposite to the direction of rotation of the spindle shaft screwing shaft and housing of the spindle prevents the loosening of the cut portion of the spindle shaft with a chisel. The shortest distance between the edges of the ribs on the shaft in the housing of the spindle equal to the step edges, prevents loosening cut of the shaft with a chisel at an oblique slice of the shaft parts, edges, or faces of adjacent surface areas of cut spindle shaft.

Performing a collapsible drive shaft between the bent sub and the engine, and months is to reduce the complexity and cost of works, associated with the disconnection and installation of the required bent sub. Also excluded are damages balls and rings, couplings, limiting their axial movement, when replacing a bent sub, increases reliability and service life of the drive shaft, because when disassembling the drive shaft axial forces on the balls of the coupling are not transmitted.

Run spindle body-side connection with a bent sub of the flow limiter in the form of elastic sliding bearing with helical channels directed against the rotation of the spindle shaft, provides throttling and circulation flushing and cooling of the drilling fluid from the drill bit up through the bearings of the spindle, and then in the channels H threaded adapter 38. This provides improved cooling of the bearings of the spindle. In addition, it provides damping stresses from bending and torque transmitted from the planetary motion of the rotor and its simultaneous rotation when running the motor stator, as well as reactive bending moment due to the cutting forces on the bit.

In addition, the connection of the spindle shaft and rotor with the corresponding section of xialin covering the inside and outside edge of the casing and connected by a threaded sleeve with the coupling without disturbing the integrity of the casing, ensures the retention of grease inside the enclosure increases the reliability and lifetime of the drive shaft.

In Fig. 1 shows a longitudinal section of the upper part of the gyratory motor;

in Fig. 2 shows the output portion of the gyratory motor connected to a bent sub with the input part of the spindle;

in Fig. 3 shows the output portion of the spindle and the point of attachment of the bit;

in Fig. 4 shows a drive shaft connected to the coupling;

in Fig. 5 shows the element I in Fig. 3 elastic sliding bearing;

in Fig. 6 shows the element II in Fig. 3 devices for keeping cut the spindle shaft with a chisel.

Below are the most preferred variant gyratory hydraulic motor.

Gyratory hydraulic motor includes a hollow body 1 placed inside multiple gyratory mechanism comprising coaxially located stator 2 and placed inside the stator, the rotor 3 and the spindle comprising a hollow spindle shaft 4, is placed in the bearings of rotation 5 in the spindle body 6 and is connected to the input drive shaft 7 of the rotor 3, and the input bit; shows the transition sleeve 8 for connecting the bit.

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The body 1 of the engine is connected with a curved sub 9 by means of a threaded casing 12.

The spindle body 6 is connected to the bent sub 9 by means of a threaded casing 13.

The spindle body 6 from the side of its end 14, which is directed to the bit, showing the sleeve 8 for fastening the bit has a circumferential rib 15, covering with a clearance of the spindle shaft 4, see Fig. 6. The hollow shaft of the spindle 4 has a circumferential collar 16 that is located between the backbone of rotation 5 and the circumferential rib 15 in the spindle body 6.

While the district collar 16 on the shaft of the spindle 4 and the circumferential rib 15 in the spindle body 6 made according to the type of continuous mating between a chamfer 17, 18, see Fig. 6.

The direction of screwing of the spindle shaft 4 and the housing of the spindle 6 (building) opposite to the direction of rotation of the spindle shaft 4.

The minimum distance "a" between the edges of the ribs, i.e., between the edge 15 and the district collar 16, is equal to the step t of edges or chamfer 17, 18, see Fig. 6.

The drive shaft 7 is movable between a bent sub 9 and the motor, see Fig. 2, 4.

The drive shaft 7 is made of two sections: the lower part (section) actually drive shaft 7 and the transition section 19. Thus the top h is oski surfaces 23, 24 in the slot T of the transition section 19.

The connection section 19 and the drive shaft 7 is made in the form of surfaces of the rotating bodies 20, 21 relative to the common axis 25, see Fig. 2, the motor and spindle.

In Fig. 2 shows: 26 - axis motor 27 to the spindle axis; the angle of the sub 9 defined by the location of the threads 10 and 11.

The spindle body 6 by connection with a curved sub 9 contains a flow limiter 28, see Fig. 3, 5, made in the form of elastic sliding bearing 29 with a screw channels 30 (or one channel with a single thread), directed against the rotation of the spindle shaft 4.

The spindle shaft 4 and the rotor 3 are connected with each respective section 7 and 19 of the drive shaft 7 by means of the clutch 31 or 32, see Fig. 2, 4, allowing angular misalignment , for example, drive-ball, and contains elastic casing 33 and a pair of rings 34 and 35, coaxial covering the inside and outside edge 36 of the casing 33 and is fastened by a threaded sleeve 37 with the coupling 31.

However, the two rings 34, 35 limit the angular displacement of the clutch 31 without disturbing the integrity of the casing 33, i.e., the threaded sleeve 37 does not touch the casing 33 at the maximum distortions of the clutch 31.

In addition, in Fig. 2 pok is La transmission fluid to the bit or sleeve 8 for securing it, see Fig. 2.

In Fig. 1 - working fluid 39, the arrow shows the direction of its supply through a column of drill pipe, which is provided for the operation of this invention.

In Fig. 3 - shows the direction of flow of the working fluid 40 for lubrication, cooling and damping elastic bearing of the slide 28.

Gyratory hydraulic engine works as follows: the working fluid 39 under pressure of 20 to 70 kg/cm2the column of drill pipe is served in a helical flow channels between the rotor 3 and the stator 2, the rotor profile is made closed. The possibility of working fluid is provided due to the difference in number of teeth, i.e., the number of teeth of the rotor is one less than the teeth of the stator. Emerging on the rotor 3 torque causes its planetary motion relative to the stator 2, which by means of a transition section 19, the drive shaft 7 and shaft-ball clutches 31, 32 is converted into rotational movement of the spindle shaft 4, the sleeve 8 and the bit.

The working fluid 39 at the output of the engine is directed through the channel N of the threaded coupler 38 to the inside of the hollow shaft of the spindle 4, the sleeve 8 to the bit where it blurs the rock during the drilling of wells. On bottom of SLE the new channels 30 elastic sliding bearing 29, choked and routed to the thread 39 of the working fluid in the channels N adapter 38 and provides cooling at the poles of rotation 5 and the damping stresses from bending and torque transmitted from the planetary motion of the rotor 3 and the stator 2 through the drive shaft section 19, 7 and couplings 31, 32, and reactive bending moment due to the cutting force on the bit, i.e., away from the sleeve 8.

In practice, the vertical wellbore is drilled to the desired depth. Then drill string is retrieved and changed the bent sub 9 between gyratory motor and the spindle.

To end a bent sub 9 spindle is held in a vertical position in the clamps (the spiders) directly on the rig for the band on the threaded casing 13. Then turns the thread 10 and the screw housing 12.

Section 19 and the drive shaft 7 are separated by means of a cone Morse 21, propeller-ball clutches 31 and 32 when not loaded.

The spindle shaft 4 is so designed that the place of its destruction (cut) is located between the poles of rotation 5 and district collar 16. In emergency cases, destruction of the spindle shaft 4 bits (sleeve 8) is held by a circumferential shoulder 16 of the shaft of SPI the Torno hydraulic motor improves the cooling of the bearings of the spindle, simplifies the separation and installation of a bent sub, improves the accuracy of drilling a well by damping and compensation of lateral forces from the bits and moments of the rotor in the spindle curved columns borehole pipes, and stores the bit when cutting the spindle shaft.

Sources of information

1. RU, patent 2081986, CL 6 E 21 IN 4/02, 1993

2. US patent 5316093, CL E 21 In 7/06, E 21 In 4/02, 1994.

1. Gyratory hydraulic motor, containing a hollow body placed inside multiple gyratory mechanism comprising coaxially located stator and mounted inside the stator, the rotor and the spindle including a spindle shaft is placed in the bearings of the rotation of the spindle body and coupled to the input drive shaft with the rotor, and the output from the bit and the motor housing and the spindle are connected by a bent sub with threads at its edges, characterized in that the spindle body from its end directed to the bit, has a circumferential edge of the covering with a clearance of the spindle shaft, and the spindle shaft has a circumferential collar located between the support rotation and a circumferential edge, with a circumferential collar on the shaft of the spindle and the circular edge in the spindle body made according to the type continuous direction of rotation of the spindle shaft, and the shortest distance between the edges of the ribs on the shaft and in the housing of the spindle equal to the step edges, while the drive shaft is movable between a bent sub and the engine, place the coupling of the sections made in the form of surfaces of solids of revolution about the common axis of the motor and spindle, and the spindle body-side connection with a curved sub contains a flow limiter made in the form of elastic sliding bearing with helical channels directed against the rotation of the spindle shaft.

2. Gyratory hydraulic motor under item 1, characterized in that the spindle shaft and the rotor are connected with each corresponding section of the drive shaft by a clutch, allowing angular misalignment, such as propeller-ball, and contains a flexible casing and a pair of rings coaxially covering the inside and outside edge of the casing and fastened by means of a threaded sleeve with the clutch at the same time, at least one of the rings limits the angular displacement of the coupling without disturbing the integrity of the casing.

 

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FIELD: oil and gas extractive industry.

SUBSTANCE: device has metallic hubs of stator and rotor, wherein crowns of stator and rotor are concentrically pressed. Crowns of stator and rotor are made of durable ceramics and are additionally equipped with connections, allowing to exclude non-controlled turning of crowns in hubs and spontaneous axial displacement thereof.

EFFECT: higher reliability and efficiency.

2 dwg

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