The turbine section of the turbo-drill

 

The invention relates to the field of drilling, in particular, to a downhole motors. The turbine section includes a body placed in it a packet turbine stator packets turbine rotor with angular contact bearings on the movable about their hubs profile shaft, made in the form of a cylindrical shaft, which is formed of spaced angle 120to each other in the cross section of three centering the flats with the possibility of engagement with the centering faces formed in the turbine hub of the rotor and angular contact bearings. The width of the centering faces is determined from the formula: profile for shaft -for hubs -where k is a coefficient selected in the range of 1.6 - 2; d - the diameter of the core shaft;- gap diameter between the core shaft and the hub. The invention provides improved efficiency, reliability and durability of the turbine section, reducing the cost of its maintenance. 3 Il.

The invention relates to the field of drilling, in particular the ora and angular contact bearings, turbine rotor mounted on movable relative to their hubs profile shaft [1].

The disadvantages of the known device is that on the core shaft and the hub turbine rotor is made of one inch, which may not provide a satisfactory centering of the turbine rotor even with a small gap between the hub and shaft profile. But with a small gap in the drilling process and storage due to rusting of the steel shaft and into the gap of many small solid particles from the drilling mud is sticking turbine rotor on the core shaft, which loses mobility. Section becomes unserviceable, it is difficult disassembly, and increase maintenance costs.

The closest device to the same destination to the claimed invention on the totality of symptoms is the turbine section of the turbo-drill, comprising a body placed in it a packet turbine stator packets turbine rotor with angular contact bearings on the movable about their hubs profile shaft [2], which is adopted for the prototype.

The disadvantages that impede the achievement of specified following technical result when using known is the Nene hex, who can provide a satisfactory centering of the hub turbine rotor and angular contact bearings with a small gap between them and the core shaft. But with a small gap often occurs the output section of the system due to jamming turbine rotor on the core shaft, it is difficult disassembly and increase maintenance costs. With increasing clearance to prevent jamming, increasing the offset of the turbine rotor on the core shaft, resulting in the need to increase the radial clearance between the turbine rotor and the stator, through which the increase of parasitic leakage of the solution past the guide vanes of the turbines, i.e. growing volume hydraulic losses, decreases the efficiency of the device.

Task to be solved by the claimed invention is directed, is the increase of efficiency of functioning of the device.

The technical result of the invention is to increase the efficiency, reliability and durability of the turbine section, reducing the cost of its maintenance.

This result in the implementation of the invention is achieved by cotora with angular contact bearings on the movable relatively to their hub core shaft, a feature of the invention is that the latter is in the form of a cylindrical shaft, which is formed of spaced angle 120to each other in the cross section of three centering the flats with the possibility of engagement with the centering faces formed in the turbine hub of the rotor and angular contact bearings, the width of the flats is determined from the ratios of:

- profile shaft

for hubs

where k is a coefficient selected in the range of 1.6-2;

d is the diameter of the core shaft; and

- gap diameter between the core shaft and the hub.

In addition, the feature of the turbine section is that contains an elastic sealing element, made for example of rubber in the form of toroidal rings or half-rings and placed on the core shaft between the hubs angular contact bearings and the upper turbine rotor in each package.

This technical result, in particular higher efficiency turbine section, is achieved by reducing the volume of hydraulic losses due to the decrease glad for the three made them centering the flats.

Improving reliability and durability, reduce maintenance costs of the section is achieved by preventing the jamming turbine rotor on the core shaft and the preservation of its mobility in the process of drilling and storage section by increasing the gap between the core shaft and the turbine hub of the rotor to prevent jamming.

All the features of independent claim are significant, that is necessary to ensure the technical result.

Other signs are part of the essential and necessary for the implementation of the particular solution structure of the device.

Thus, the placement of the elastic sealing element, made for example of rubber in the form of toroidal rings or half-rings, on the core shaft between the hubs angular contact bearings and the upper turbine rotor in each package allows for the elastic end preload all turbine rotor in the package, bridging the gap between the turbine rotor shaft and profile to prevent over drilling fluid through the gap, rust and sediment particles of the solid phase therein, thereby to maintain the mobility profile of the shaft, to increase NSI with the what this technology does not know the set of indicators proposed by the invention, allows to make a conclusion that the claimed invention meets the condition of “novelty.”

From the above it follows that the invention meets the condition of “inventive step”, as it is not obvious to a person skilled in the industry.

The drawings show: Fig.1 shows a turbine section of the turbo-drill; Fig.2 is a cross section profile of the shaft with the hub of the turbine rotor in a static position; Fig.3 is a cross section profile of the shaft with the hub of the turbine rotor in the working position.

The turbine section consists of a housing 1 holds packets turbine stator 2, packets turbine rotor 3 and the angular contact bearings 4, placed on a movable about their hubs 5 and 6 core shaft 7, which is made cylindrical with three centering faces 8, in engagement with which includes centering the flats 9 formed in the turbine hub of the rotor and angular contact bearings.

In the turbine section can be mounted on the core shaft between the hubs angular contact bearings skolian in the form of toroidal rings or half-rings.

The turbine section is as follows. When pumping drilling mud through it of the turbine rotor 3 rotates relative to the turbine stator 2, fixed in the housing 1, whereupon the hub 5 of the turbine rotor rotates relative to the core shaft 7, concatenated with its centering faces 9 with centering flats 8 core shaft and centered on it (Fig.3). Profile shaft starts to rotate, rotates relative to the hub 6 angular contact bearings 4, engages with its centering flats with centering faces of the hub 6 and is centered in the radial-thrust bearings. Rotation from the core shaft is transmitted to the bit.

When used in the construction of the turbine section of the elastic sealing elements 10 mounted on the core shaft between the hubs angular contact bearings and the upper turbine rotor in each batch (Fig.1), prevents the flow of drilling fluid through the gaps between the turbine hub of the rotor and shaft profile and accumulation in the gaps sediment solid phase. In addition, when the downhill section into the well on the string of drill pipes and filling the latter through a section of borehole zhidkostyami fluctuations bit elastic sealing elements prevent the occurrence of connectors between the turbine hub on the core shaft, getting through them a solid phase in the gaps between the turbine hub of the rotor and shaft profile. Thus remains the mobility of the shaft relative to the package turbine rotor and angular contact bearings.

Thus, the tool embodying the claimed device in its implementation, is intended for use in drilling wells, namely, mud motors, in particular, in turbodrills. For the claimed device as it is described in the independent clause sets out the claims, confirmed the possibility of its implementation using known means. The device embodying the claimed invention capable of achieving the above technical result.

Therefore, the claimed invention meets the condition of “industrial applicability”.

Sources of information

1. A. C. SU # 137075, CL E 21 In 4/00, 1960.

2. A. C. SU # 1550068, CL E 21 In 4/00, 1987 (prototype).

Claims

1. The turbine section of the turbo-drill, comprising a body placed in it a packet turbine stator pack is m shaft, characterized in that the latter is in the form of a cylindrical shaft on which are formed spaced at 120° to each other in the cross section of three centering the flats with the possibility of engagement with the centering faces formed in the turbine hub of the rotor and angular contact bearings, the width of the centering faces is determined from the ratios of the

for profile shaft

for hubs

where k is a coefficient selected in the range of 1.6 - 2;

d is the diameter of the core shaft; and

- gap diameter between the core shaft and the hub.

2. Section under item 1, characterized in that it contains an elastic sealing element, made for example of rubber in the form of toroidal rings or half-rings and placed on the core shaft between the hubs angular contact bearings and the upper turbine rotor in each package.

 

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2 dwg

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