产稠油ALX气井井筒流动型态研究

发布时间：2018-01-11 17:04

本文关键词：产稠油ALX气井井筒流动型态研究　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：在进行稠油组分及粘温特性分析的基础上,从常用的水基和油基两大类降粘剂中选取11种降粘剂,将其与稠油配制成5种不同浓度的试样,在井口温度为9℃和井底温度34℃条件下,懫用RS-6000流变仪对试样进行流变性测试,分别给出了稠油流变性参数及视粘度。结果表明:在低用量条件下,水基降粘剂会使稠油的粘度增大,ALX气井中不能采用;油基降粘剂可以有效地降低稠油的粘度,从技术指标和经济成本两方面综合考虑,优选出了CY1JL降粘剂,且最佳用量范围为22%~25%。根据风吹水面激起波浪的杰弗里斯(Jeffreys)波浪产生条件,参照泰特尔-杜克勒(Taitel-Dukler)水平管气液两相流动型态判别准则及流动型态分布图,懫用极值法确定了波浪向下游传播的速度并选取平均杰弗里斯遮蔽系数,建立了在环雾流状态下气流可携带稠油的最大粘度方程式,根据实际生产资料,求出了ALX气井中气流可将所产稠油携带出来时稠油粘度的最高值(气井稠油降粘目标值)为0.02092914mPa.s,化学降粘技术无法将稠油粘度降到此值。根据特纳(Turner)方法,从提高气井产量和优选生产管柱的角度考虑,进行了大量计算。计算结果表明:要想将气井中稠油采出,产气量需提高到近2.4×104m3/d,远大于气井的实际产量;要想将气井中的最大液滴举升到地面,需将生产管柱直径从62mm降到30mm。在水平向,如果能将液膜以液滴的形式从油管内壁上剥离下来,并随气流一同上升,气流速度需要克服稠油液膜的表面张力和粘弹性模量,结合杰弗里斯提出的产生波浪的方程,建立起了修正杰弗里斯方程。根据修正杰弗里斯方程的计算结果表明:当同时考虑表面张力和粘弹性模量影响时,气井井筒已全部被稠油液膜占据,气井被堵死,无产量。在垂直向,根据安萨瑞(Ansari)方法,液膜如果能沿井筒内壁向上流动,需要井筒中气芯的压力梯度和液膜的压力梯度收敛。根据大量的计算结果表明表明:当稠油液膜厚度大于3mm(除了液膜厚度等于15mm)时,液膜均可沿井筒内壁向上流动,稠油可以被采到地面。
[Abstract]:Based on analysis of heavy oil fractions and viscosity temperature characteristics, selected 11 kinds of viscosity reducer from water-based and oil-based two kinds of viscosity reducer, the heavy oil and prepared into 5 different concentrations of samples at the wellhead temperature is 9 DEG C and the bottom temperature under 34 DEG C, Zhi RS-6000 rheology instrument for sample rheology test, the rheological parameters are given and the heavy oil. The results showed that the apparent viscosity at low dosage, water-based viscosity reducer will make the oil viscosity increase, not used in ALX gas well; oil viscosity reducer can effectively reduce the viscosity of heavy oil, considered from the two aspects of technical indicators and the economic cost, optimized the CY1JL viscosity reducer, and the optimum dosage range of 22%~25%. according to the wind surface wave Jeffries (Jeffreys) conditions of wave, referring to his - Duke Le (Taitel-Dukler) of gas-liquid two phase flow patterns identification in horizontal pipe Criterion and flow pattern map, Zhi using extreme value method to determine the velocity of wave propagation to the downstream and select the average Jeffries shading coefficient, the maximum viscosity equation in annular mist flow under the condition of air flow can carry heavy oil was established, according to the actual production data, the air can be produced by ALX gas well in carrying out the highest value of heavy oil when the viscosity of heavy oil (sticky target value is 0.02092914mPa.s, reduced gas heavy oil) chemical visbreaking technology cannot the viscosity drop this value. According to Turner (Turner) method, from the point of improving the yield and optimization of production string wells consideration, have done a lot of calculations. The calculation results show that to wells in heavy oil recovery the gas production, need to be increased to nearly 2.4 x 104m3/d, actual output is far greater than the wells; to lift the largest drop in gas wells to the ground, the column diameter decreased from 62mm to 30mm. in the horizontal direction, if you can The film will be in the form of droplets from the pipe wall on the stripped down, and with the air flow rate will rise, to overcome the surface tension and viscoelastic modulus of heavy oil film, combined with the wave equation proposed by Jeffries, established a modified Jeffries equation. According to the modified Jeffries equation calculation results: when considering the effect of surface the tension and viscoelastic modulus, wellbore has been heavy oil film occupy, gas is blocked, no production in the vertical direction, according to Ann monsouri (Ansari) method, if the film can flow upward along the shaft wall in the shaft, need core pressure gradient and liquid pressure gradient according to a large number of calculation convergence. The results showed that when the oil film thickness is greater than 3mm (except for the film thickness is equal to 15mm), the liquid can flow upward along the wellbore wall, heavy oil can be taken to the ground.

【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE345;TE31

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