基于双指标评价的负压冲砂射流泵排出压力影响研究

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中图分类号：TE934 文献标识码：A DOI：10.12473/CPM.202507093

Abstract：The current evaluation system for jet pumps relies heavily onpump efficiency，which，however， cannot directlyreflect thecore engineering objective（i.e.bottomhole sand cleaning efficiency）of negativepressure sand washing.This paper presents a dual-index collborative evaluation system for jetpumps in negativepressure sand washing，where solid-phase conveying rateand pump eficiency arecombined to represent the solidphase suction capacity of jetpumps.Using the Fluent software，the solid-liquid two-phase flow numerical simulationwasconducted to investigate the influence of discharge pressureon the solid-phase suctioncapacity of jet pumps.The results show that there exists acritical threshold efectof discharge pressure on the solid-phase suction capacity of jet pumps.When the discharge pressure exceeded 3MPa ，the effective pressure difference in the throat wassignificantly reduced by over 80% ，leading toa steep decline in the solid-phase conveying rate.Meanwhile， the pump efficiency peaked near a discharge pressure of 2MPa ，revealing a contradiction between energy conversion efficiency and sand cleaning eficiency.High discharge pressure intensified the kinetic energy dissipation in thethroatanddownstreamregionsof the jetpump，and the sharpatenuationof kinetic energydirectlyinhibited the solid-liquid energy exchangecapacity，，whichindirectlyconfirms theessential reason behindthelossofsolid-phase conveyingcapacity.Asthe annular solid-phase volume fraction increased，the solid-phase conveying rate rose by approximately 40% .In practical operations，it is necessary to balance the negative-pressure sand washing efficiencyand the energy eficiency.This research providesatheoreticalbasis andengineering optimizationguidelines for efficient sand washing in low-pressure oil and gas wells.

Keywords：negative-pressure sand washing；jet pump；dual-index evaluation；discharge pressure；solid phase conveying rate；suction capacity；sand cleaning

0 引言

随着油田开采进入中后期，地层能量下降、出砂严重，造成井底砂堵，严重影响了油气井生产，已成为低压油气井减产的主要问题[1-5]。（剩余11226字）