The most decisive constituent of operating expenditures in sucker-rod pumping operations is related to the system's electric power use as installations are driven by motors. Consequently, reduction costs can be translated energy losses both downhole and on surface. Therefore, efficiency surface components system well overall play a big role maximizing profits. paper presents critical analysis individual introduces novel models find total efficiency. typical main (the pump, string, unit,...

Abstract Worldwide more than two thirds of the oil wells are placed on some kind artificial lift, mostly sucker-rod pumping, ESP, or gas lift. Because great number installations it is extremely important that they operate under optimum conditions. Even small changes in operational efficiencies can significantly increase expenditures, so optimization energy efficiency has a impact profitability production. The presentation deals with establishing most energy-efficient operation lift...

Power requirements and profitability of sucker-rod pumping are basically determined by the torque load on unit’s gearbox. Gearbox torques include required to drive polished rod used rotate counterweights. In addition these, inertial arise in those parts unit that turn at varying speeds. As shown paper, all components functions crank angle; consequently, their exact calculation necessitates knowledge angle versus time function. This circumstance, however, complicates calculations because...

Abstract First, the paper gives a classification of calculation models commonly used for multiphase vertical pressure drops in oil wells. The main parameters experimental data to develop different empirical correlations are presented indicating ranges where expected perform best. Next, an analysis and many possible causes error is given. Deviation calculated measured shown stem from sources that can have importance case case. author collected summarizes findings previously published...

Electrical submersible pumping is the most inflexible of any artificial lift system because a specific ESP pump can only be used in definite, quite restricted range rates. If it outside specified range, and efficiencies rapidly deteriorate eventually mechanical problems leading to complete failure develop. When serious deviation from design production rate experienced, possible solutions are (a) running different with proper recommended operating or (b) using variable speed drive (VSD) unit....

Summary A properly designed sucker-rod string should provide failure-free pumping operations for an extended period. Improper design of rod tapers can lead to early mechanical failures (rod breaks) with a complete termination action and inevitable loss production. Because its prime importance in technology, several rod-string-design procedures that are based on different assumptions were developed the past. most breaks fatigue failures, must consider cyclic nature loading appropriate...

Abstract A properly designed sucker-rod string should provide failure-free pumping operations for an extended period. Improper design of rod tapers can lead to early mechanical failures (rod breaks) with a complete termination action and inevitable loss production. Because its prime importance in technology several procedures based on different assumptions were developed the past. Since most sucker breaks are fatigue must consider cyclic nature loading appropriate endurance limit material....

Summary Two of the most important artificial-lift methods applied in oil wells are sucker-rod pumping (SRP) and electrical submersible (ESP, with thousands installations all over world. Their operational features application ranges quite different, but many cases either them can be used a given well. The final selection proper method has to on basis energy efficiency, one requiring least amount surface power input is selected. This paper provides necessary background for evaluating...

The profitability of sucker-rod pumping depends mainly on the prime mover's power use because dominant part operational cost is bill. required mover power, however, defined by torque loading unit's gearbox. paper analyzes different kinds gearbox components, their possible calculation methods, and introduces a novel procedure that utilizes data dynamometer survey. Traditional counterbalancing methods normally assume combined center gravity crank plus counterweights system falls centerline...

Abstract One of the most successful long-stroke pumping units available today is Rotaflex, a completely mechanical device. Its construction entirely different from traditional beam pump mechanisms and has polished rod stroke lengths up to 366 in. Due low speeds required special geometrical arrangement Rotaflex require significantly less torque than provide several other advantages over those. The unit's important component uni-directionally rotating roller chain connected through an elastic...

ABSTRACT This study presents an improved method for designing sucker rod taper percentages. The API RP11L is the usual source When it was last revised, in 1976, necessary to make several simplifying assumptions because complete calculations were too laborious hand calculation.

The design of an ESP installation is started with the selection centrifugal pump, heart system. To choose one must calculate installation's Total Dynamic Head (TDH) that a measure required pressure increment to be generated by pump under operating conditions. Although this basic task in process, some controversies still exist industry about way TDH should calculated and many standard literature sources recommend incorrect formula. paper discusses available calculation models for single-phase...