Face engine

FIELD: oil and gas industry.

SUBSTANCE: device has turbine module, screw gear couple, including stator and rotor, assembly for connection of rotor of screw gear couple to turbine module and spindle, according to invention, rotor of screw gear couple has pass channel, into which a valve is mounted, including locking element and saddle, while locking element is mounted on resilient element with space to saddle surface and with possible contact with saddle surface. When engine is launched whole flow of drilling mud skirts screw gear couple through pass channel in rotor and open valve, i.e. through space between locking element and saddle surface and is directed into turbine module. In face engine loads on elements of gear couple are decreased during its launch due to redistribution of flows of working liquid between screw gear couple and turbine.

EFFECT: higher reliability, higher durability.

2 cl, 3 dwg

 

The invention relates to means for drilling oil and gas wells, namely, downhole motors to drive the bit.

Analogue of the invention is Downhole motor”described in A.S. No. 346967, CL E 21 03/12 (publication from 25.09.1978, Bulletin of Inventions No. 35).

In the analog described downhole motor including surround the engine and the turbo-drill, and their shafts are connected kinematically and casing are connected socket.

The design of the engine has similar shortcomings that reduce its competitiveness in comparison with commercially available volumetric screw downhole motors used for drilling vertical and directional wells.

The main drawback of the engine is similar large axial dimensions of 19.5-26 meters that cannot be used when drilling directional and horizontal wells, as well as this engine has a high price and operating costs.

Known invention “Screw screw engine with turbine activator” RF patent No. 2203380, CL 7 E 21 04/02, F 03 In 13/02, (publication from 27.04.2003, Bulletin of Inventions No. 12). This is the closest analogue and is used as a prototype of the claimed invention.

In the prototype solved the problem by reducing the size of the engine, but this engine has a number of the merits of the different disadvantages, affecting the reliability of the engine.

In the prototype engine contains screw gyratory couple and up to 60 of the turbine stages - activator gyratory pair turbine module with input and output cavities, the spindle including a radial bearing, the rotor speed of the turbine fixed on the shaft of the working section together with the rotor screw screw section, and a stator stage of the turbine in the housing together with the stator coil gyratory pair. Screw gyratory pair has reduced step, the elevation angle of helix in the range from 30 to 50°that allows one meter its working body to accommodate the growing number of steps.

In practice, however, such working couples in the mode of the hydraulic motor are braking, which negatively affect the operation of the engine.

When enabled, mud pump drilling mud enters the screw gyratory couple is forced through the gap between the rotor and stator and then flows into the turbine - activator. Due to the fact that the gyratory pair is resumezapper, this engine function “starter” performs turbine - activator, which, producing the torque overcomes the static friction torque between the rotor and stator screw screw pair, then the engine starts to rotate and enters the working mode.

When you run the engine the entire flow of mud coming from the mud pump, gets to screw gyratory couple and forced through the gap between the rotor and stator. This triggered a significant pressure drop from 50 MPa to 140 MPa with the value of the starting pressure 160-180 atmospheres, exceeding the working pressure of 100-120 ATM mud pump, which requires additional power drill pumps.

A significant pressure difference presses the rotor against the stator with great effort and deforms the elastic lining of the stator, causing misalignment of the rotor relative to the stator, which also adversely affects the performance of the engine.

In such conditions for starting the engine requires an increased torque. For this purpose the turbine-trigger, trigger additional pressure drop, however, this does not protect against increased wear parts gyratory pair, which is a significant lack of engine prototype.

Another disadvantage of this design is a big loss of power turbine - activator due to the fact that the turbine rotor rotates eccentrically relative to the stator. This calls for increasing the radial clearance, which sealed additional seals in the form of a rubber ring, which complicates and increases the cost of design is the ie engine.

The technical task of the present invention is to provide a downhole motor with high reliability.

The problem is solved due to the fact that in the known downhole motor containing the turbine module with input and output cavities, screw gyratory couple with the input and output cavities, comprising a stator and a rotor, the connection node of the rotor screw screw pair with the turbine module and the spindle according to the invention the rotor screw screw pair contains a passage that hydraulically connects the input cavity screw screw pair with the input cavity of the turbine module through the gap of the valve, including the shut-off element and the seat, with the locking element installed on an elastic element with a gap to the surface of the saddle and with the possibility of contact with the surface of the saddle moreover , the locking element may be in the form of a piston with the ability to move freely flow channel, the upper end of the piston has a spherical or conical surface, under which a radial groove.

In the present invention, when the engine is running the entire flow of the drilling fluid bypasses screw gyratory couple through a passage in the rotor and open valve including a closing element, made for example in the form of a piston, and a saddle, that is, through the gap between long is it and the surface of the saddle, and sent to the turbine module. The turbine is started and, acting as a “starter”, starts screw gyratory couple. When this screw screw pair is running in pump mode. Then, when triggered valve, i.e. the piston comes in contact with the surface of the seat under the influence of the mud flow, overcoming the resistance of the elastic element, the entire flow of the drilling fluid passes through the screw gyratory pair, generating a main torque on the rotor screw screw a couple turns in the motor mode.

This saves the high-performance power characteristics of the downhole motor, at the same time reduces the load on the screw elements gyratory pair when it is run through the flow distribution of the working fluid between the screw gyratory pair and turbine module, which increases the reliability of the engine.

For the radial groove of the spherical or conical surface of the upper end of the piston while the piston is able to move freely flow channel of the rotor, allows for the maintenance of downhole motor to extract the piston from the rotor special gripping devices.

Figure 1 shows a General view of the downhole motor in longitudinal section.

Figure 2 shows a section of downhole number is I in the place of installation of the piston with a clearance to the surface of the seat;

Figure 3 shows a section of the downhole motor in place of the piston without a gap, with the possibility of contact with the surface of the saddle.

Downhole motor (figure 1) consists of a spindle 1, a turbine module 2 and screw gyratory 3 pairs. Screw gyratory pair includes a rotor 4 and a stator 5. The stator 5 is fixed to the drill pipe (not shown) by sub 6. In the lower part of the rotor 4 is located the valve (figure 2, 3), comprising a locking element 7, a seat 8 and the elastic element 9. The locking element 7 is made, for example, in the form of a piston, and an elastic element 9 is made, for example, in the form of a spring.

Screw gyratory pair 3 is connected to the turbine module 2 with subs 10 and 11 (figure 1).

The turbine module 2 includes a shaft 12 and installed rotor blades 13 and the sleeve 14, the housing 15 and the installed vanes 16 and the radial bearing 17. The rotor blades 13 and sleeve 14 mounted on the shaft 12 of the turbine module 2 through a torque, for example, sub 18. Vanes 16 and the radial bearing 17 fixed in the housing 15 of the turbine module with sub 11 by tightening the package details.

In the case of the spindle 1 (Fig 1) has a shaft 19. The shaft 19 of the spindle mounted on ball bearings (not shown). The shaft 19 of the spindle connected to the shaft 12 of the turbine module 2 through a clutch (not shown). To the lower part Vala spindle mounted rock cutting element, for example, the bit (not shown).

The rotor 4 is connected to the shaft 12 of the turbine module using the connection node, such as a hinge 20. The rotor made a passage 21 for the hydraulic connection of the input cavity And (1) screw gyratory pair 3 with output cavity B through holes 22 (figure 2, 3), performed in the saddle 8. The output cavity B (1) screw gyratory pair 3 hydraulically connected to the input cavity In the turbine module 2.

Downhole motor operates as follows.

During the descent downhole motor in the well of its internal cavity B In (1) are filled with drilling mud through the gap G (figure 2) and a passage 21. Then the drilling fluid fills the cavity and the internal cavity of the drill pipe.

When enabled, mud pump drilling fluid flows through the drill pipe of the downhole motor. From the cavity And drilling mud flows, bypassing the inter-turn camera screw 23 gyratory pair 3, flow channel 21, through the gap G and the holes 22 in the output cavity B and then into the input cavity Century, When the inflow of drilling fluid to the rotor blades 13 and the stator blades 16 last generate torque, the shaft 12 of the turbine module 2 starts to rotate, resulting in the forced rotation of the rotor 4 screw screw pair and the shaft 19 of the spindle 1. When this screw gyratory pair 3 p is operating in the pump mode, pumping a portion of the drilling fluid from the cavity And into the cavity B through inter-turn camera 23 and the turbine module operates in mode “starter”.

When increasing the flow rate of the drilling fluid pressure in the flow channel 21 is increased, the piston 7 descends, overcoming the resistance of the elastic element 9. Working surfaces 24 and 25 (figure 2, 3) of the piston 7 and seat 8 touching, blocking the gap, Then the entire flow of the drilling fluid passes through the inter-turn the cameras 23 coil pair 3, generating a torque on the rotor 4. When the rotor 4 screw gyratory pair 3 operates in the motor mode, creating a main torque on the shaft 19 of the spindle.

Thus, the launch of the rotor 4 screw gyratory pair 3 and the transfer screw gyratory 3 pairs in the motor mode occurs when the normal operating pressure of the drilling fluid (less than 100 ATM) at the time of rotation of the rotor 4 shaft 12 of the turbine module 2.

This ensures reliable start downhole motor, without creating a large pressure drop in helical gyratory pair, eliminating the skew of the rotor 4 relative to the stator 5, increases the service life of the downhole motor. Downhole motor has a simple structure compared with the prototype, making the cost of its manufacture and operation are reduced, small dimensions allow IP is to alsowhat not only for drilling of vertical, but deviated wells, while maintaining high efficiency and energy performance. Reduction of loads on the screw elements gyratory pair when the engine is running due to the flow distribution of the working fluid between the screw gyratory pair and the turbine increases the reliability of the engine.

1. Downhole motor containing the turbine module with input and output cavities, screw gyratory couple with the input and output cavities, comprising a stator and a rotor, the connection node of the rotor screw screw pair with the turbine module and the spindle, characterized in that the rotor screw screw pair contains a passage that hydraulically connects the input cavity screw screw pair with the input cavity of the turbine module through the gap of the valve, including the shut-off element and the seat, with the locking element installed on an elastic element with a gap to the surface of the saddle and with the possibility of contact with the surface of the saddle.

2. The engine according to claim 1, characterized in that the locking element is designed as a piston and is able to move freely flow channel, and the upper end of the piston has a spherical or conical surface, under which a radial groove.



 

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4 cl, 2 dwg, 5 ex

FIELD: oil and gas extractive industry.

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