Rotary engine

 

(57) Abstract:

Rotary engine designed for use in the field of power engineering in the hydraulic motors for deep drilling to drive the downhole tools. The motor has a rotor with straight blades parallel to the axis of the rotor interacting with flexible working cameras installed around the perimeter of the housing parallel to the blades and the axis of the housing. On the inlet and outlet flexible working chambers of the valves with the help of the spools and the pressure of the springs control the flow of the working agent through the camera and adjust the pressure in the chambers and the amount of torque on the motor shaft. The engine includes a housing, a shaft, a rotor, a stator consisting of a pipe shaped slots and attached flexible working chambers. The shaft rotates in the housing on bearings. Housing bushings installed the intake and exhaust valves. The spools are rotated together with the shaft. The closing plane and the channels on the spools kinematically connected to the rotor blades and ensure the timely opening of the intake valve and closing the exhaust valves flexible working chambers. It has high energy the definition of mechanical engineering, and specifically to the class of hydraulic motors for deep drilling (E 21 4/02) to drive the downhole rock cutting tools. Can be used to develop engines for drilling oil and gas wells and solid minerals.

Known motors for downhole rock cutting tools: rotary drills, screw motors, other downhole motors.

Screw downhole motors all modifications consist of motor and spindle sections. In the motor section includes a stator and a rotor, which gerotor mechanism. The stator is designed as a steel case, vulcanized rubber with a profiled helical teeth, the number of which is greater by one than the number of teeth of the rotor. Spindle section consists of a housing and a shaft with a set of radial and axial bearings. The torque from the rotor of the motor is transmitted to the spindle shaft cardan or torsion shaft. The separation of the screw of the engine into two sections due to the fact that the rotor in the stator is not installed coaxially with the housing and offset by half the height of the tooth of the screw. Such kinematics causes severe engine vibration and other downhole mechanisms connected with him. Vibration is RA, as well as premature wear of tools and equipment connected with the engine.

Due to the fact that on one coil of the pair of teeth per stator torque is small, to obtain the total torque on a shaft, sufficient to ensure the technology of drilling operations, it is necessary length of the shaft and housing to increase to the desired dimensions. But most of the length of the downhole motor limits the rate of drift during the drilling of directional wells, especially during the drilling of additional barrels of emergency wells. These disadvantages are partially corrected in later constructions screw downhole motors at the expense of more sophisticated profiles of the teeth of the rotor and the stator, providing a continuous contact between them during operation (patent of the USSR 671463, published. 07.09.93. Bull.33-36, SV 926209 AND 07.05.82., SV 1384702 A1 30.03.88., SV 1794176 A1, 07.02.93., RV 2075589 C1, 20.03.97., as well as in the construction of hydraulic downhole motors, where the axis of the rotor and stator are combined, for example, RV 2017921 C1, 5 E 21 4/02 13.12.90., published. in bull. 15, 15.08.94.

Closest to the proposed rotary engine of all solutions is the "hydraulic downhole motor (RV 2017921 C1, 5 E 21 4/02), consisting of a housing, a stator with zakreplennye, installed coaxially with the stator. Elastic shell otlavlivatsya from the cylindrical surface of the stator fluid and forms channels camera, bounded on the sides of the locking rods. When liquid flows through the channel, the membrane is pressed against the faces of the screw shaft, on line overlapping the channel edge of the shaft creates the force and torque that causes the shaft to rotate. Due to the alignment of the shaft with stator significantly reduced vibration mechanism. Torque created by the pressure differential on line overlapping the channel edge of the shaft on the area of the segment formed by the arc of contact of the edges of the shaft with an elastic shell of the camera and the projection of the arc on the face of the shaft is very small, since the area of the segment and the differential pressure is limited by the design of the device, the strength and thickness of the elastic membrane. Therefore, to obtain on the shaft torque required for rotation of the bit, the number of consecutive chambers and the length of the engine will be comparable to the number of turns and length of the serial of the downhole motor of the same size and power.

An object of the invention are to improve energy and operational characteristics of the downhole motor is a motor, comparable in diameter, increasing the manageability engine to change speed shaft and the torque, the vibration reduction mechanism, the improvement of wear resistance of the machine, reducing its cost.

This technical problem is solved by the installation of the proposed motor rotor with straight blades, parallel to each other and the axis of the shaft interacting with rectilinear flexible working cameras located around the perimeter of the housing, parallel to the blades and the axis of the rotor and the stator, while the input and output flexible working chambers of the valves and on the shaft of the rotor - valve, with the possibility of rotation and overlap the respective valves for filling flexible working chambers of the working agent and release them from him. A spring installed on the exhaust valves, adjustable pressure in flexible working chambers.

Coaxial shaft in the housing allows you to remove the spindle and drive shaft, bearings on the shaft are selected taking into account the loads occurring on the bit during drilling. In the contact area between cameras with blades, which is determined by the length of the blade and the diameter of the chamber creates a force equal to the product of vcamera in areas touching the edges multifaceted shaft with elastic shell of the stator in the engine of the prototype or on the crowns of the teeth of the downhole motor, allowing for a small length of the blades to create a torque required for drilling operations. As a serial screw engine D designed for use in wells with a diameter 124-130 mm, has a length of 3.2 m, a rotary engine, designed to work in the same wells and with the same energy and operating parameters will have a length of 0.7-0.8 m with subs. In serial propeller engines and engine with multi-faceted spiral shaft, i.e. in the case of engines with a continuous flow of the working agent through the camera, the number of revolutions of the shaft and torque simultaneously depend on the flow of the working agent, i.e. it is not possible to change the number of revolutions of the shaft without changing the torque.

In the proposed engine torque on the motor shaft, the number of revolutions of the shaft and the engine are determined by the relationship:

M=P L d R m KnKto,

N = Q/0,785 d L m b,

H = 2 3,14 M N/A 75 60 1,36,

where M is the torque on the motor shaft, NM;

N is the number of revolutions of the shaft 1 min;

H engine power, KW;

Q is the flow rate of the working agent, m3;

P is the pressure inside the elastic chamber, MPa;

L is the length of the rotor blades, m;

d - internal di is icesto rotor blade, PCs;

TOn- coefficient of the blades under load is 0.33 and 0.35;

Ktothe averaging factor of the contact area during the cycle of operation of the chamber under pressure to 0.6;

I - efficiency - 0,7-0,75.

Since the pressure inside the elastic of the working chambers is maintained in the settlement within the spring exhaust valve, irrespective of the flow of the working agent, it becomes possible to change the speed of the shaft to the technologically optimal, leaving the torque within the specified limits, which is of great importance when working the mill within a casing. At the stage of manufacture of the engine is possible, without changing its basic structure and diameter, to prepare the engine slow speed with high torque or high-speed motor by increasing or decreasing the length of the blades and cameras.

In the proposed engine of its active parts (rotor blades, the outer surface of cells in contact with the blades of the rotor, a metal support piece stator) is not in contact with the working agent, as the entire stream it passes through flexible working camera.

Slide cameras on the blades when the transmission from the camera to the shaft is less than flooring the ve agent from the working chambers, i.e. in the absence of pressure in them. The free space of the cavity between the blades and flexible working chambers, limited bushings mounting valves, is filled with oil. This reduces the wear on the most loaded parts of the engine. In propeller engines and engine prototype friction shafts about rubber occurs constantly during their rotation under pressure pumped agent that accelerates their wear.

Comparable analysis of the technical parameters of the proposed engine parameters downhole screw motors and prototype shows that a significant difference of the rotary engine from downhole screw motors and prototype is:

- installation of the rotor with straight blades, parallel to each other, the axes of the rotor and the motor housing, interacting with flexible working chambers of the stator mounted around the perimeter of the body parallel to its axis and the rotor blades;

- installation on the inlet and outlet flexible working chambers of the valves with spools control the flow of the working agent through them and give the ability to create flexible working chambers necessary pressure to ensure that the estimated torque presses the valve to the valve, for vibration damping spools and maintaining the pressure inside the chambers within the specified limits.

Thus, the proposed rotary engine meets the criteria of the invention of "novelty" and "significant differences".

The solution of the technical problems of creating, on the basis of the proposed engine "normal range" downhole motors with a wide range of torque and number of revolutions of the shaft for drilling holes of various diameters and assignments, as well as giving the engine the possibility of changes in the process of drilling the numbers of revolutions of the shaft with the retaining torque value, the solution of which still failed to specialists, as can be seen from the analysis of the Park worked for the last fifty years downhole motors in Russia and abroad, as well as the analysis of the patent literature, are entitled to assume that the proposed rotary engine meets the criterion of "inventive step".

In Fig. 1 shows a longitudinal section of the engine; Fig.2 - section a-a in Fig. 1; Fig. 3 - scheme of the intake valve 13.

The engine includes a housing 1, a shaft 2, a rotor 3 that has three blades, parallel to the axis of the shaft (3.1, 3.2, 3.3), a stator consisting of a pipe 12 with PepsiCo 4, 5, the inner ring which seals 15, 16 mounted on the shaft 2 by a nut 19 and the sub 20. The housing 1 is connected with the column of drill pipe sub 6. Installed in the housing sleeve 8 and 9 for fastening the inlet 10 and outlet 11 of the valve. All items inside the fixed nipple 7. Sub 20 is connected with the rock cutting tool. The spools 13 and 14 mounted on the shaft 2 on the dowels on a sliding fit, providing a floating movement of the spools in the valve. On the polished planes spools 13 and 14 facing the valve, cut channels segments required depth and width for feeding the working agent in flexible working chamber 21 through the inlet valve 10 and out through the exhaust valve 11. The number of channels segments equal to the number of blades on the rotor. The spool 13 is mounted on the shaft 2 so that the inlet valve is opened the flow of the working agent in one of the working chambers 21 at the moment when one of the rotor blades will take a position against it. The width of the segments, opening the flow of the working agent in flexible working chamber is equal to the distance between the valves in a circle of their location. In Fig. 2 shows that the blade 3.1 is against the camera 21.1.

The piano is accommodated, valve 10.1 is not yet open. Upon further movement of the valve blades 10.1 opens. The valve 14 mounted on the output from the working chambers, while filling it closes the exhaust valve and opens it, as soon as the blade will be the sector of the camera. On the spool 14, the sizes of the segments, the locking release of flexible working chambers, more sizes of the segments on the slide valve 13 that opens the entrance flow in them, the value of providing a complete closing of the exhaust valves when the flow of fluid into the said chamber. To compress spools to the valve shaft 2 worn springs 17 and 18. The spring 18 limits the fluid pressure in the flexible working chambers to specified limits. The number of blades on the rotor and flexible working chambers in the stator, depending on the size and design of the engine, may be different, but to avoid "dead spots" when the engine is running, the quotient from dividing the number of cells by the number of blades should not be a multiple of.

The operation of the rotary engine

Working substance (liquid, gas) is supplied through the drill pipe, sub 6, the Central channel in the shaft, the hole 23 in the cavity between the shaft and the housing. The upper part of the cavity with high pressure isolated from signet flexible working chamber 21 through the open valves 10.

In Fig. 3 by the dotted shading shows the closed valves 10.1, 10.2, 10.4, 10.6 and 10.7. Valves 10.3 and 10.5 are open, through them, the worker agent is supplied into the elastic working camera 21.3, 21.5, which shift the blades 10.2 and 10.3 on the length of the arc occupied by the cameras. As can be seen in Fig. 3, the valve 10.1 opens when another is closed valves 10.3 and 10.5. Thus, during operation of the engine will always be open two or three valves, therefore, two or three flexible working chamber will be under load, and the rest of the camera will be under the sink. Each blade, moving from one elastic working chamber to the other, for a time left without effort on the part of the camera, but as the number of flexible working chambers is not a multiple of the number of rotor blades, idling blades will not coincide in time and the rotor is stably rotate at constant torque. The amount of torque, number of revolutions of the shaft and the engine depend on the size, the design of the engine and the flow of the working agent. But as shown by approximate calculation, the proposed engine of comparable power parameters with turbodrills, screw engines and engine with multi-faceted spiral shaft, will be several times less GABA is wells consisting of a body with it set on radial-axial bearings of the rotor shaft and a stator fixed on the perimeter of flexible working chambers, parallel to each other and the axis of the housing, subs for connection with the column of drill pipe and drill bit, characterized in that the rotor is constructed with straight blades parallel to the axis of the shaft and flexible working chambers, the inlet and outlet flexible working chambers of the valves and on the shaft of the rotor - valve, with the possibility of rotation and overlap the respective valves for filling flexible working chambers of the working agent and release them from him.

2. Rotary engine under item 1, characterized in that under the valve exhaust valve set spring for regulating pressure limits of the working agent in flexible working chambers.

3. Rotary engine on PP. 1 and 2, characterized in that the number of flexible working chambers in the stator is not a multiple of the number of blades on the rotor.

 

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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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