The article considers the problem of determining conditions under which use a frequency converter in submersible pump control station leads to reduction electrical energy costs and becomes efficient from an point view. Analytical expressions are given that allow calculating specific during artificial lift oil production for case when operating mode well flow rate provided by wellhead choke thro...

<span>This paper is aimed at addressing the design of an effective adaptive nonlinear control a photovoltaic (PV) water pumping system powering submersible induction motor and centrifugal pump. Four objectives are achieved using Backstepping controller. First, it applied to ensure maximum power point tracking, uses latter as reference in regulation rotor speed convert electrical into mech...

Standard ISO method for chlorophyll a quantification (extraction into ethanol, spectrophotometrical quantification at 665 and 750 nm), spectrofluorometry (reader for 96 wells, excitation 410 nm, emission 670 nm), and a submersible fluorescence probe for in situ phytoplankton quantification (excitation 410, 525, 570, 590, and 610 nm, emission 685 nm) were compared in different freshwater environ...

This paper presents the effect of high viscosity oil and two-phase foamy-oil flow on the performance of a single stage centrifugal pump. As a part of this, the applicability of a pipe viscometer to determine the foamy oil viscosity is investigated. Unlike previous studies, a sealed fluid tank is used in a closed flow loop to allow conditioning the two-phase mixture to create foamy-oil. Furtherm...

A convolutional neural network support vector machine (CNN–SVM) method based on multichannel feature fusion is used for progressive fault diagnosis of offshore oil and gas wells. The excellent classification performance CNN attributed to its ability extract representations from large amounts easily distinguishable data. However, the capability severely constrained by noisy small sample amount e...

Natural gas hydrate (NGH) is a kind of clean energy with great potential because its huge reserves. There are several effective methods for exploiting sediments such as depressurization, thermal excitation, inhibitor injection and displacement, etc. Among these methods, the combined depressurization heat method considered very promising method, which solves problem insufficient supply during pr...

Although the use of low-order equivalent models is common and extensively studied for control of aircraft systems, similar analysis has not been performed for submersible systems. Toward an improved understanding of the utility of low-order equivalent models for submersible systems, we examine control design for pitch-axis motion of an autonomous underwater vehicle (AUV). Derived from first pri...

The prospect of the National Aeronautics and Space Administration developing a second generation Ocean Color Scanner has produced the need for coincident in A= scientific measurements which examine the primary productivity of the upper ocean on time and space scales that are large compared to the environmental scales of interest. Central to the investigation of the productivity, are questions o...

In this paper we present a novel feature initialization technique for the Simultaneous Localization and Mapping (SLAM) algorithm. The initialization scheme extends previous approaches for identifying new confirmed features and is shown to improve the steady-state performance of the filter by incorporating tentative features into the filter as soon as they are observed. Constraints are then appl...