During the two years that have passed since the previous conference, the volume of submersible electric centrifugal pumping plants (SECPP) produced by the joint-stock company ALNAS decreased initially from 600 to 200 units, and then increased again to 850 units. These fluctuations in plant utilization could not have made an impression on the performance of all plant services.All this time, the establishment has been working actively with the largest oil companies of Russia -LUKOIL, YuKOS, TNK, Tatneft', the Siberian Oil Company, and others. These companies periodically formulate or define more precisely their own requirements for submersible equipment, which we not only take into account, but also optimize.During this period, ALNAS has successfully solved several problems among those posed to us by individual oil companies. Improvement in Resistance of Insulation for Stator Winding. Work with the LUKOIL Company has conf'trmed that requirements for the insulation of the stator winding of the electric motor have increased sharply. The following steps have been taken to fulfill these requirements.Most importantly, impregnation of stators with a plugged internal opening has been implemented; this has made it possible to improve the impregnation process and increase the resistance of the insulation by a factor of 1.5-2.In conjunction with the Special Design Office for the cable industry (Mytishi, Moscow Oblast), moreover, two new types of lead wires have been developed to replace the polyphenol chloride wires. The insulation placed around the first of these wires is made up of tbur layers of a polytetrafluorethylene film (with subsequent baking) and a fluoroplastic layer applied by the extrusion method. Insulation of the second wire consists of two layers of a Grade PMR-S 352 polyimide-fluoroplastic film or a Capton | film (with subsequent baking) and a fluoroplastic layer applied by the extrusion method.The outside diameter of these wires is reduced by 1-1.5 mm as compared with the polyphenol chloride wire; moreover, the resistance of the insulation has been increased by a factor of 10, the breakdown voltage raised by 3-5 times and has reached 45---60 kV, and the operating temperature raised to 200~Use of the new wires has made it possible to improve the resistance of the insulation by as much as 1.5-2 times. These measures taken in combination have provided for an increase in the resistance of the insulation on the stator windings of electric motors from 200 to 1000 Mr2 in the cold state. Improvement in Pump Reliability, Reduction in "Flight" Risk. The following measures have been adopted in this direction.The vibration levels of all pumps are being measured over a two year period on a test plant; this will make it possible to monitor the stability of the procedure employed for their fabrication.The fabrication of pumps with an elongated wheel boss was begun in 1998; moreover, the wheels are fabricated from Ni-Resist; according to the joint-stock company NOVOMET, this provides for an eleven-fold increase in the pump...
One of the key problems associated with the manufacture of immersed systems, their service, and repair is a problem of the interaction between producers and users regarding technical problems. Therefore, the ALNAS Plc started in 1996-1997 the development of a system of mutual relationships of the plant as a producer of the electroimmersion centrifugal pumps (EICP) with the users (Fig. 1). This resulted in the formation of a stable three-contour system with feedbacks so that it is possible to solve quite efficiently the problems of modernization and increase the quality of production.In the ALNAS PIe, two design sections are concerned with these problems: the chief designer (CDS) and the engineering center. The CDS is involved mainly in modernizing commercially manufactured products, optimization, and other adaptation of products for specific conditions and requirements of the user.We shall now examine the problems facing the CDS at present, the main problem being the breakdown of the pump, so-called "flights." In order to reduce the probability of "flights," it was decided to produce f~dng components along the entire length of the system using bolts of strength not lower than 10.9, and the pin and nuts, of material with a strength grade not lower than 10. The loop connection was developed. Service tests were carried out and positive results were obtained. It should be noted that this solution has not yet been used by oil engineers because the Kogalymneftegaz Company only recently showed interest in obtaining these pumps.The organiTation was one of the first ones to start producing pumps with the flange-casing joint. At present, these pumps have been sent to experimental service to Surgnt, Nizhevartovsk, Urai, and "Tatneft'."Another novelty is the replacement of the output module (head module) by a trap head positioned on one of the sections. Tiffs enables the number of bolted joints to be reduced.In addition, to prevent the possibilities of rotation of the bolts in the flange-casing joint, a new collar is produced on the base of the pump (working name ALNAS). The collar is produced in two types (simple for placing on the existing base), and in the form combined with the protective elements of the cable. At present, the NGDU is carrying out selection and these holders will be then subjected to experimental service.Finally, simple reinforcement of the joint areas and liquidation of the stress concentrators do not remove fully the possibility of "flights" because the first reason for their formation, i.e., the vibration, cannot be removed by this method. Therefore, the CDS is carrying out intensive work to fred methods of reducing vibrations.At present, all the pumps manufactured by ALNAS Plc are fitted with intermediate bearings. The production of a bearing designed by Central Design Bureau of the Surgut Company is about to start.The head of pumps manufactured in the USA contains a radial bearing. The development of the flange-casing joint has also made it possible to install a radial bearing in the pumps manufactu...
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