Improve The System Efficiency Of Pumping Wells

Abstract

：System efficiency of pumping wells is an important indicator of whether the oil well running well. The higher the single well system efficiency, the more balance in whole system, and the less consumption of electricity. The results of test show that the pumping wells average system efficiency of Chaheji oilfield is 25.5%, and the efficiency of surface and underground are 59.4% and 42.9%. There is much promotion space for improvement. In this paper, by analyzing the influential factors of system efficiency, we put forward the methods including optimizing ground equipment parameters, rational using the wellbore technology, enhancing the formation energy to further improve the efficiency of the system.

Multi-objective optimization method using an improved NSGA-II algorithm for oil–gas production process

“…Based on the basic flow of oil-gas production process and referring to the related literatures [5,9,11,12,15], the corresponding decision variables of each subsystem are selected by analyzing the entire production process. The stroke and the stroke times of each rod-pumped well in the block are selected as the decision variables of the sucker-rod pumping system.…”

“…n w j is the water cut, and J is the number of rod-pumped wells. When the reservoir characteristics, crude oil physical property and suction parameters (S, n, D, L, {d i , L i } i=1,2,...,I ) are certain, the pump efficiency α is only the function of the submergence pressure p s [5]. Then, basing on the oil well production capacity cooperative equation and the relationship between the bottom hole flowing pressure and the submergence pressure, Eq.…”

“…(5) and (6), it is easy to see that Q w (X ) is also the function of S j and n j when other parameters are constant.…”

“…When the method is applied in oilfields, it can effectively cut down the energy consumption and greatly improve the efficiency of sucker-rod pumping system. When the technical equipment conditions are certain, an optimization model is set up by Dong et al [5] to improve the efficiency of sucker-rod pumping system, in which the suction parameters of the sucker-rod pumping system are taken as decision variables and the highest system efficiency is taken as the objective. The pump efficiency of sucker-rod pumping system is also improved by Wu et al [6] through optimizing some influential variables.…”