A NEW CALCULATION METHOD FOR GAS-WELL LIQUID LOADING CAPACITY A NEW CALCULATION METHOD FOR GAS-WELL LIQUID LOADING CAPACITY

A NEW CALCULATION METHOD FOR GAS-WELL LIQUID LOADING CAPACITY

  • 期刊名字:水动力学研究与进展B辑
  • 文件大小:143kb
  • 论文作者:WANG Yi-wei,ZHANG Shi-cheng,YA
  • 作者单位:Ministry of Education Key Laboratory of Petroleum Engineering,Petroleum Exploration and Production Research Institute,Si
  • 更新时间:2020-09-15
  • 下载次数:
论文简介

Availableonlineatwww.sciencedirectcomScienceDirectJoumal of HydrodynamicsELSEVIER2010,22(6)823-828www.sciencedirect.com/Do:10.106S1001-6058(09)601220science/journal/10016058A NEW CALCULATION METHOD FOR GAS-WELL LIQUID LOADINGCAPACITYWANG Yi-wei, ZHANG Shi-chengMinistry of Education Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249,E-mail:wangyw@pepris.comYaN JinPetroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, ChinaCHen Wen-binSinochem Petroleum Exploitation and Production Co, Ltd, Beijing 100031, chinaReceived april 8, 2010, Revised June 15, 2010)Abstract: This article proposes a new model for calculating the gas-well liquid loading capacity, which is critical to an accurateprediction of gas well production. Based on analysis of flow regime during the gas well production with water, which is regardedmany single particles in the model, with the shape of particles being assumed as disk -like ellipsoid instead of traditional sphere andchanging according to the forces exerted on them, the infuences of non-Darcy flow, compressibility, and non-sphere shape onfriction factor are analyzed. The differences between the new model and other models are discussed and a new formula forcalculating the critical flow rate is obtained. The calculation results and a comparison with other two models show that the newmodel is more consistent with the actual situation and is practicaKey words: gas well, accumulated liquid, drag factor, critical flow rate1 Introductionaccepted and applied models in the prediction ofMost gas fields in exploration in China contain liquid accumulation are the wall film mobility modelsome water, so two phases, that with water and that and the high speed gas drag model.. There are twowithout water, coexist in the whole exploring process. different points of views concerning the geometry ofAn optimized production, based on a detailed analysis the liquid drop which is not continuous.Oneof dynamic process, pressure system and other factors, assumes that the liquid drop is still spherical and ofis desirable to make the production period without the Newton liquid, and a model can be built based onuids will begin to this assumption, The other assumes that the liquidaccumulate in the well once the carrying capacity is drop is ellipsoidal due to the pressure differences, anot enough after the beginning of gas-carrying liquids model can be built based on that assumption and abeing produced! and this will disturb the exploration formula can be derived for the critical gas-rate7-10)seriously. The prediction of the gas carrying capacityThe widely used calculation models are Turnerand to make a good use of this capacity are very model and Li Min mode!-13), with results apparentlyimportant in planning a proper exploration strategy In different due to factors of turbulent flow,this article, the formulas for the critical velocity and compressibility and non-sphere geometry. 151.In thisflow rate are derived through theoretical analysis of article, the formulas for critical velocity and flow ratethe forces affecting liquid dropsare derived through theoretical analysis of the forcesThe studies of vertical tubing models may be affecting liquid dropstraced back to a quite early time and the popularly中国煤化工.Biobraphy: WANG Yi-wei(1973), Male, Ph D Candidate. 2. LiCNMHSenior engineeris the annular-mistflow, with the liquid being continuously brought outby the high speed gas flow. The liquid drop will move liquid drop. The Renault number reflects the influencein the opposite direction once the velocity of gas is of the liquid property, geometry and moving velocitylow a critical value and the liquid accumulation will on the liquid drop. Hostaux number is the ratiogin(Fig. 1). Thus, the continuous liquid movement between the gravity and the surface tension, whichin the wellbore should also be described by the liquid reflects the physical property of the continuous phasedrop modelThe Renault number usually is more than 1 000 forproducing gas well and the Morton number for waterLiquid filmand normal low molecular weight organic liquid isusually between 10 to 10, and the geometry ofFmixedmoving liquid drop should be a flat ellipsoid4. Calculation of drag coefficientNatural flow Liquid accumulating Liquid accumulatedNavier-Stokes equation for incompressibleliquid flowing around a sphere. It is however mainlyFig. I The liquid accumulation processdetermined by experiments. The relation between dragcoefficient and Renault Number. obtained from alaof experiments, with a single3. Geometry of liquid dropcompressible sphere steadily flowing in a stable,two main forces acting onisothermal and infinite medium, is defined as theliquid drop, one is the velocity pressure, the other is standard drag coefficient curve(in Fig 4)the surface force. The two forces jointly make thepe of sphere or flat ellipsoidduring the flowing (Fig. 2). The liquid drop isNewtonspherical when the surface force is large and the dropis difficult to be brought out, because the effectivearea in the flow direction will be less than that for anStokesellipsoid. The moving velocity of gas is quite highand the velocity pressure on the liquid drop could beneglectedFig 4 Standard curve of drag coefficient vs Renault numberThe factors, such as turbulence flowcompressibility of gas, non-isothermal conditionnon-spherical shape and rotation of liquid drop. areFig. 2 The geometry of liquid drop during high speed movingnot discussed here. The experiments carried out1971 by Baily and Hiatt indicate that the actuallymeasured results of drag coefficient is far deviatedfrom the standard drag coefficient curve. The mainDiscoidal elfactors influencing the moving liquid dropturbulence, gas compressibility and non-sphericalshape, and their joint effect can be described by afactorCD=C f(Re)f(O(M)Pwhere f(o) is the turbulence effective modificationg3 Thefactor, f(M,factor, B the non-spherical shape modificatiThe geometry of the liquid drop is shown infactor中国煤化工Re ), Hostaux number Eo) and Morton numberCNMHGfrom experiments(Nm ), are used to describe the forces acting on the will be higher than the standard drag coefficient curvewhen the turbulence reaches 8%, and this difference liquid cannot be compwill increase as the turbulence increases. The dragThe gravity to make liquid drop or fall down iscoefficient curve will obey the theoretical curve onlywhen the turbulence is less than 1% and Re

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