Plain thrust-journal bearing on shaft driving end of asychronous machine of vetohin for oil-and-gas wells (amv ogw)

FIELD: electricity.

SUBSTANCE: creation of multipurpose high-loaded thrust-journal bearing on shaft driving end of submersible electric motor of vertical open design is executed using inserts made of high-density frictionproof powder material. Asynchronous machine (AMV OGW) contains housing (1), shaft (2) with collar (3) on driving shaft end and having thrust surfaces (4) and (11) at both sides which surfaces function as moving sliding surfaces (4) for pump, (11) for drilling gear. For immovable parts of bearing, inserts (6) and (10) are used which are made of high-density frictionproof powder material with the same sliding surfaces (4) and (11) allowing motor to work with its driving end up for pump driving and down - for drilling gear driving. Cooling of bearing sliding surfaces is executed by fluid environment through holes (13) and (14) in the housing (1) and through free gaps (7), (15), (16), (17) between the housing (1) and the shaft (2).

EFFECT: higher reliability and lifetime of asynchronous machine operating at submergence depth up to 3000 m and at high temperature of strata water.

2 dwg

The invention relates to the field of electrical engineering, in particular to a submersible electric machines, which are used for drives of various underwater mechanisms drilling and production units in the development and production of minerals and mineral resources of oil and gas on the seabed, as well as for drives borehole pumps and drilling mechanisms in the exploration and commercial development of the marine continental shelf for oil and gas.

Known electric machine open design for operation in sea water at any depth with active cooling of the internal parts outboard marine water (see "Electrical machine Vetohina EMW", patent No. 2072609, BI No. 3, 27.01.97), which has a stator, a rotor with a shaft and bearings, enclosed in a leaky casing filled with liquid coolant, and bearing shields with holes. As the cooler used sea water, and the holes in the bearing shields for cold entrance and exit of heated water are the two groups. As the bearings in the specified machine uses ball bearing type U1 and U from corrosion-resistant stainless steel.

The disadvantages of these bearings are:

1. Small resource in seawater (500-700 hours).

2. Not intended for operation in vertical execution is Aline.

Known closest to the claimed chosen for the prototype is an electric machine Vetohina EMW (see "Electrical machine Vetohina EMW", patent No. 1833703, USSR. 1989). This machine has a journal-thrust bearings for electrical machines of the type EMW liners which are made of high density anti-friction powder material (ceramic), and the movable sleeve is made of high-strength, corrosion-resistant, heat-treated stainless steel. On the shaft at the free ends of installed flexible sleeve and bearing shields pressed inserts. -Thrust bearings in this machine ensure its reliable operation as a drive any underwater mechanism in an infinite depth of immersion in sea water when all the rolls and trim. The disadvantage of this design EMW in relation to submersible electric motors (SEM) Neftekhim is co measurement of the diameter and length of the rotor of the big sizes, as well as the inability to carry out the bearings with movable bushings submersible electric motors for pumps and mechanisms "Boers" for oil and gas wells with small diameter casing and stator for a permanent tower, at which the load will only support moving powers the ü. Pad for oil and gas wells have a small diameter to 150 mm, and the length of the large capacity of the engine reach up to 8 m, with the protector up to 16 m, in which the stators, the rotors and the protector are multistage. In addition, when the drilling depth up to 3000 m ambient temperature acidic aggressive formation water reaches 150°C, so the bearings should be compact and resistant to corrosive formation water at high temperatures at high specific loads and have high reliability and availability.

The objective of the invention is to increase reliability and service life designed asynchronous machine "CA NGS vertical shaft up to the pumps, the shaft down to the mechanism of "Drilling" on the immersion depth up to 3000 m and the temperature of the reservoir water up to 150°C due to the use of universal persistently high load-bearing small bearing from the drive shaft end with liners made of powder materials, perceiving the main thrust load from the pump or drilling mechanism.

The task is solved in that in the known asynchronous submersible electric machine vertical performance with a drive end of the shaft up or down, containing a multipackage the stator and ventkanalami the rotor monolithic VA is om, bearings, cathodic protection active parts in the form of bushings and rings from aluminum-magnesium-zinc alloy, enclosed in a housing with openings for inlet and outlet of the surrounding formation water for cooling, drive shaft end provided with a flange serving as a movable part of a hard-bearing sliding bearing with two-way thrust sliding surfaces, and on the shaft with bearing sliding surfaces with precision machining of surfaces up to 7-10 cleanliness class as the stationary parts of the bearing with both sides of the thrust surfaces of the flange applied liners high-density anti-friction powder material (ceramic), which also have thrust with side flange and the support side of the shaft sliding surface rough treatment, and in the case of the engine with the drive inserted bearing the shield of the body material with a recess for the flange that is pressed wtogua one liners, the fastening of the bearing shield is screws with countersunk head through symmetrically located holes in the housing, the second the opposite of the same size liner pressed wtogua in the recess of the vehicle body, the liners are provided with continuous grooves on the sliding surfaces to remove abrasives coolant flowing through the free the data gaps between the bearing shield, the housing and the shaft, and cooling the produced water flows from the environment through symmetrically located holes in the case at the beginning of the bearing and the clearance between the shaft and the housing, and the heated water exits through similar openings in the building in the center of the bearing on the collar.

The invention is illustrated by drawings, where:

- figure 1 shows a bearing unit from the drive shaft end;

- figure 2 shows the liner-thrust sliding bearing from the drive shaft end.

1 shows a bearing unit from the drive end of the shaft, which includes a shaft 2 with the thrust collar 3 having resistant comb sliding surfaces 4 and 11 with precision machining grinding up to 7-10 cleanliness class. Perpendicular to the shaft there is a reference comb sliding surfaces 5 and 12 with the same processing parameters as the flange. To drive the pump when the motor shaft is located upward in the housing 1 is pressed wtogua liner 6 of the powder material (ceramic) brand BRGM, which is also resistant 4 and reference 5 sliding surfaces. For cooling of the sliding surfaces has a free space 7 through which flows produced water from the cavity CA NGS. For the drive of the drilling mechanism, when the motor is located is Agueda shaft down on the other hand flange for support of the weight of the rotor in the housing 1 of the motor zapressovyvajutsja on a hot landing bearing shield 8 from corrosion-resistant stainless steel 12X18H10T with a hollow in the form of a cylinder for pulling the liner. The fastening of the bearing shield through symmetrically located holes in the housing 1 by screws 9 diameter M6-M8 from high-strength heat-treated stainless steel 40H13. In the recess of the bearing shield 8 zapressovyvajutsja wtogua the liner 10 of the high-density anti-friction and anti-corrosion powder material, which is resistant 11 and the base 12 of the sliding surfaces. In the cavity CA NSAs in the region of the bearing unit water from the environment comes through symmetrically located holes 13 in the casing 1, and through holes 14 of the heated water exits from the cavity of the machine. The circumference of the holes 13 and 14 are evenly placed at an angle β relative to each other, the holes of one group 13 is shifted by the angle β/2 relative to the other groups 14 to improve water exchange and to preserve the mechanical strength of the casing. Choose 6 holes in each group with a diameter of 5 mm each with diameter up to 150 mm For cooling the moving pairs of bearing water from the cavity of the engine through the gaps 7, 15, 16, 17 between the housing 1 and the shaft 2 is transmitted for which hladiny directly on the sliding surfaces of the bearing. For cathodic protection against galvanic corrosion of the bearing unit and the shaft on the shaft 2 is pressed wtogua protective sleeve 18 and the housing 1 is inside him pressed ring 19 made of magnesium alloy grades ML with tight electrical contact with the housing 1 and the shaft 2. The liners 6, 1, and 10, figure 2, high-density powder antifriction material BRDM can carry a specific load of 120 kgf/cm²in axial and radial directions at temperatures up to 300°C, therefore the working gap of the sliding pair in the horizontal and vertical directions should be running 60÷80 MK for shaft diameter up to 60 mm, in order To improve the cooling of the sliding pair and removal of the particulate liners 6 and 10 has an axial groove 20 on the support surface and the slots 21 on the hard surface as a continuation of the grooves. The geometric dimensions of the grooves on the diameter of 5-6 mm, the configuration of the cross section is a semicircle, 2.

When using an electric motor as a drive for drilling mechanisms driving end of the shaft down added in this regard, additional operations during Assembly. After mounting the rotor front bearing shield 8 is pressed liner 10 zapressovyvajutsja wtogua in the motor housing and is fixed by screws 9 on the circumference of the body, after which zapressovyvajutsja on the shaft protectora the sleeve 18 and the housing - the tread ring 19. Thus, when the engine is running with the drilling mechanism the load from the weight of the rotor and "Bura" perceives resistant surface 11 of the liner 10. Thrust and thrust surfaces of the flange 3 should be termoobrabotannyj and polished to 7-10 grade purity. These surface liners must be rough, lathe processing, it is necessary only to observe the clearance between the sliding surfaces with respect to temperature of the heated environment of the pad up to 200°C with regard to the run of the rotor, so as not stalled rotor during operation.

The rotor shaft must be continuous to enhance the torsional rigidity during operation. Cooling it is provided by heat transfer into the surrounding water and due to the large thermal conductivity of the material of the shaft, it almost warms up to (1-2°C higher than the water in the gap between the stator and the rotor.

The proposed solution allows considerably to improve the reliability, performance and increase the lifetime of the CA NGS on the immersion depth up to 3000 m ambient temperature fluid 150°C through the use of universal small-size high-loaded journal-thrust bearing at the drive end of the shaft for operation as a pump drive shaft up and as a mechanism for "Borax" shaft down, and with a significant deviation from rtically axis of the machine up to 80°.

Asynchronous machine (CA NGS) vertical performance with a drive end of the shaft up or down, containing a multipackage the stator and ventkanalami the rotor monolithic shaft, bearings, cathodic protection active parts in the form of rings and bushings aluminum-magnesium-zinc alloy, enclosed in a housing with openings for inlet and outlet of the surrounding formation water for cooling, characterized in that the drive shaft end provided with a flange serving as a movable part of a hard-bearing sliding bearing with two-way thrust sliding surfaces, and on the shaft with bearing sliding surfaces with precision machining of surfaces up to 7-10 cleanliness class in as the stationary parts of the bearing with both sides of the thrust surfaces of the flange applied liners high-density anti-friction powder material (ceramic), which also have thrust with side flange and the bearing from the shaft sliding surface rough treatment, and in the case of the engine with the drive inserted bearing the shield of the body material with a recess for the flange that is pressed wtogua one liners, the fastening of the bearing shield is screws with countersunk head through symmetrically located holes in the housing, the second the opposite of the same sizes in ladys pressed wtogua in the recess of the vehicle body, the liners are provided with continuous grooves on the sliding surfaces to remove abrasives coolant flowing through the gaps between the bearing shield and the shaft, the cooling produced water comes from the environment through symmetrically located holes in the case at the beginning of the bearing and the clearance between the shaft and the housing, and the heated water exits through similar openings in the building in the center of the bearing above the collar.