Singular step of turbodrill turbine

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

 

The invention relates to the field of drilling oil and gas wells hydraulic downhole motors, namely, turbodrills.

Known single-stage turbine, which are made of steel casting on the model in the form of a stator and a rotor, which is a finished product after machining [1, page 53; 2, p.73].

The disadvantages of the known devices are not high enough lifespan of a single stage turbine when working in abrasive drilling fluids and volatile energy response of the turbine itself.

Also known single stage of the turbine of the turbo-drill, comprising a metal hub of the stator and rotor, in which concentric pressed crowns stator and rotor made of cast steel [3, p.44-47, 4, 5]. Fabrication of the crowns of the stator and rotor by precision casting method enhances product quality and improves energy characteristic of the turbine as a whole.

The disadvantages of the known device is the following.

First, not enough high service life of a single stage turbine, about 400-600 hours when working on drilling fluids containing a high percentage of the solid phase.

Secondly, when working on the water and abrasive drilling fluids, the flow rate of the liquid metal turbines is limited to 5-8 m/s, as if led is the increase of the flow velocity of the fluid above the specified value, the wear of blades sharply intensified, in proportion to the ratio of velocities in Cuba, and the operation time of the turbine drops significantly (150-350 hours).

Thirdly, as the metal of the turbine in the mud decreasing its energy characteristics. Industrial tests were conducted showed that since the start of operations of the turbodrill efficiency of the turbines is reduced by 27-32%, and torque at 22-32% [3, page 46-47].

Fourthly, metal turbines do not work on weighted drilling fluids with a density of ρ ≥ 1700 kg/m3and at low costs drilling fluid Q≤ 20· 10-3m3(for example, dimensions 195 mm). That is, modern turbines are not able to fully utilize all the potential inherent in the turbine drilling method - turbodrills.

Fifthly, in conditions of high vibration and periodic presuppression crowns in the hub is split place under press-fit, with possible spontaneous rotation of the crowns.

The aim of the invention is to increase the service life of the flow channel of the turbine and the reliability of its work.

This goal is achieved by the fact that in a single stage of the turbine of the turbo-drill, comprising a metal hub of the stator and rotor, in which concentric pressed crowns stator and rotor, the crowns of the stator and rotor are made of wear-resistant ceramics is IKI, while the crown of the stator has projections included in grooves made on the hub of the stator, the rotor hub has a flange to prevent movement of the crown of the rotor down, and down on the hub of the rotor is a metal sleeve-retainer having a cavity, and on the crown of the rotor is made projections that are included in the cavity of the sleeve-retainer for fixing the crown of the rotor from rotation and axial displacement.

Comparative analysis of the prototype shows that the proposed device has new features and links.

First, the crowns of the stator and rotor are made of wear-resistant ceramics, which allows significantly, at least 10-20 times, to raise the service life of the flow channel of the turbine. Completely remove all restrictions on the density of the drilling fluid, the fluid flow, the flow velocity of the liquid in the impeller to the turbine apparatus, and more fully use the potential of the turbodrill.

Secondly, the crowns of the stator and rotor equipped with connections to prevent uncontrolled rotation of the crowns in the hubs and their spontaneous movement, which promotes reliable fixing of the crowns in the hub prevents unintentional turning them relative to each other under the action of torque, as well as their axial displacement. In addition, standing ceramic Venza is relative to the hub prevents their mechanical destruction from the action of axial forces.

Figure 1 shows a single stage of the turbine of the turbo-drill with ceramic crowns, figure 2 is a view As in figure 1.

A single stage of the turbine of the turbo-drill includes a hub 1 of the stator and the crown 2 of the stator is made of ceramics, and the hub 3 of the rotor ceramic crown 4 of the rotor and the sleeve-retainer 5.

Because ceramics works well for compressive stresses, the crown 2 of the stator is installed in the hub 1 of the stator on lagopesole landing and their projections 6 enters into the grooves 7, which is made on the hub 1 of the stator.

The crown 4 of the rotor is installed in the hub 3 of the rotor on the carrier landings, because ceramics is very bad for tensile stresses. The flange on the hub 3 of the rotor does not allow the crown 4 of the rotor to move down. Top on the hub 3 of the rotor bushing-latch 5 on the press fit. Moreover, the depression 8 in the sleeve-retainer 5 are projections of the crown 9 of the rotor and reliably limit the crown 4 of the rotor from rotating and axial movements.

The work of a single stage of the turbine is as follows.

When the flow of fluid through the turbine blades due to the velocity difference on the “back” and “trough” of the scapula occurs the pressure difference. The trough and the pressure more. The product of pressure to the square determines the force that creates a moment about the axis of the turbine. The rotor curb the us starts to rotate, and the stator perceives the reactive torque.

On the stator reaction torque from the blade apparatus is transmitted to the rim of the stator, then through lagopesole landing, the grooves 7 and the projections 6 on the hub 1 of the stator, which is clamped by the axial force at the Assembly in the body of the turbodrill. In the manufacture of the stator must be sure that the crown 2 of the stator housed his end is lower than the end face of the hub 1 of the stator, 0.5 mm, to prevent its destruction at the Assembly.

When leggierezza landing in the stator may be undesirable and would lead to the destruction of the ceramic crown 2, when assembling the connection of the crown 2 of the stator and the hub 1 of the stator on glue that will prevent inadvertent movement of the crown 2 relative to the hub 1 in the axial direction.

The torque from the guide vanes of the rotor is transmitted to the inner rim of the rotor, then through the slots 8 and projections 9 on the metal nut-lock 5, which is installed on the press fit in the hub 3 of the rotor. Thus, it is a reliable transmission of torque and reactive moment with crowns 2 and 4 of the hub 1 and 3.

Technical and economic efficiency from the use of ceramic crowns is very high. Practically installs all the disadvantages of a single speed turbines made of metal. The turbine of the turbo-drill with ceramic the crowns may not work reliably on drilling fluids with high density ρ W2700 kg/m3and the cost of washing fluid Q≈ (10-12)· 10-3m3/s without any reduction of the energy characteristics of the mud motor during its operation. This so-called qualitative indicators that may affect the technical and economic indicators of the drilling process and the cost of one meter of penetration.

The most notable economic effect is achieved due to high service life of a single stage turbine.

First, decide the value of life. According to field data nozzle apparatus, made of wear-resistant ceramics CM-332 or SCI-303, when the speed of the expiration of 100 m/s have a resistance of 80 hours. Nozzle wear is on the order of 1 mm, assuming that to allow the turbine apparatus identical Solovay apparatus of the nozzles of the bit and can be wear at 0.25 mm, in this case, it motorjesus will be 20 hours at a speed of 100 m/S.

As noted above, the flow rate in the turbine is limited to 5-8 m/S. let us Assume that the speed of the shoulder apparatus of the turbine is equal to 10 m/s Then the resistance of ceramic crowns will be

t=20· (100/10)3=20· 1000=20000 hours.

If you apply the safety factor for the service life of k=2,0, guaranteed service life of ceramic turbine will be 10000 hours, instead of 400-600 hours metal curb the us, that is, 16.7-25 times more. When the utilization rate of downhole equipment in drilling in year k=0,125 single stage turbine, equipped with ceramic crowns, can work successfully for 10 years. When the value of the serial single-stage turbine precision casting in 375 rubles and considering the fact that during the year there is a change of three sets of turbines in the amount of 330 degrees, for example, in one three-section of the turbodrill TSS-195, the total cost will amount to 375· 330· 3=371250 rubles. When using a single stage turbine, which is equipped with ceramic crowns, these costs will not.

Thus, in the year one turbodrill type TSS-195 excluding transportation costs from the turbine shop drill and back, as well as loss of funds on lifting, testing and dismantling of the turbodrill profit will be at least 371250 rubles per year. If the profits to distribute one drilling company with a fleet of turbodrills 100 pieces, the annual economic effect from the use of ceramic crowns will be at least 37125000 rubles.

References

1. Wppreview. Maintenance and repair of turbodrills, M.: Nedra, 1966

2. Wavedeck. Drilling oil and gas wells, M.: Nedra, 1985

3. Survey information series “Machines and oil equipment,” Design and characteristics of the modern turbodrills” Urikhanyan, Vol, Saimona, M.: UNIJECT, 1980

4. Autosaved. The USSR №111795 And class. E 21 In 4/02, 1958

5. RF patent №2005890 C1, 1994

A single stage of the turbine of the turbo-drill, comprising a metal hub of the stator and rotor, in which concentric pressed crowns stator and rotor, characterized in that, the crowns of the stator and rotor are made of wear-resistant ceramics, and the crown of the stator has projections included in grooves made on the hub of the stator, the rotor hub has a flange to prevent movement of the crown of the rotor down, and on top of the rotor hub mounted metal sleeve-retainer having a cavity, and on the crown of the rotor is made projections that are included in the cavity of the sleeve-retainer for fixing the crown of the rotor from rotation and axial displacement.



 

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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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