Influence of complicating factors on a rod pump productivity

Relevance. In the Russian Federation rod screw pumps installations are widely used in the Ural-Volga region and first of all in the Republic of Tatarstan as they allow extracting reservoir liquid of the increased viscosity with the content of mechanical impurity and gas. The main aim of the research...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Izvestiâ Tomskogo politehničeskogo universiteta. Inžiniring georesursov 2018-05, Vol.329 (4)
Hauptverfasser: Galia Ildusovna Bikbulatova, Anatoliy Andreyevich Isaev, Yulia Anatolievna Boltneva
Format: Artikel
Sprache:rus
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Relevance. In the Russian Federation rod screw pumps installations are widely used in the Ural-Volga region and first of all in the Republic of Tatarstan as they allow extracting reservoir liquid of the increased viscosity with the content of mechanical impurity and gas. The main aim of the research is to determine the effect of complicating factors, such as the presence of mechanical impurities, increased viscosity, water cut of formation fluid, on operational efficiency of rod screw pumps; determine the regularities in reducing the operating time of the rod column and the elastomer of the pump. Objects. The main number of rod screw pumps is in wells, which have opened the layers of the Bashkirian stage and the Verean horizon. They are distinguished by high viscosity of oil and presence of water-oil emulsion. The analysis of the chemical properties of oil samples from 188 wells in Sheshmaoyl, Kondurchaneft and Ideoloyl, operated by rod screw pumps, showed that the average viscosity of oil wells is 610 mPas. At the same time, a significant proportion falls on the wells producing reservoir fluid with a viscosity of more than 500 mPass. Methods. The accumulated volume of operational data on Bashkirian and Vereisk horizon wells equipped with rod screw pumps allows determining the operating time of the rod pumps reduction with an increase in viscosity of the fluid caused by a significant growth in hydraulic resistance to rotary motion of the rod string. The carried out statistical analysis of the rod screw pumps repair determined the regularity of wearout degree of the elastomer depending on a number of accumulated rotor speed, water content, content of mechanical impurities in the produced fluid, saturation pressure, fluid level in the well and with favorable conditions. Results. We defined the main complicating factors which influence the efficiency of rod pump operation. The analysis of the rod screw pumps repair causes shown that low quality of polished rods produced by the manufacturer, rod deviation from geometric parameters of different structures, hardness, chemical composition of rods (factory defect) are often the causes of breaks. Open threaded rod or polished rod was primarily due to insufficient torque screwing the threaded connection or a bend in the rod head. The breackage of polished rods mainly occur in the oil seal and due to fatigue voltage. The fatigue fracture occurs as a result of permanent deformation forces and temperature action. One o
ISSN:2500-1019
2413-1830