【作者】 修春红；

【导师】 艾池；

【作者基本信息】 大庆石油学院 ， 油气井工程， 2002， 硕士

【摘要】 大庆油田自实施聚合物驱以来，在采油工艺上暴露出一个严重的问题，即抽油杆与油管偏磨较水驱时速度和程度加剧，其主要原因是聚驱油井比水驱油井的采出液粘度增加，导致与粘度有关的各种摩擦力增加，聚合物驱抽油机井见聚后悬点最大载荷较水驱时增大，悬点最小载荷较水驱时变小，抽油杆柱受力状况变坏，而且抽油杆在下行程时纵向压缩载荷增大，使得抽泊杆柱失稳产生纵向弯曲的屈曲变形波数增加，因此抽油杆与油管偏磨加重，杆断率增大，作业井次明显增加，影响聚驱油井生产；同时作业费用增加，使得采油成本加大。 本论文针对此问题，进行了聚驱油井杆管偏磨机理分析，根据现场数据得出偏磨的影响因素，首先从聚驱井产出液的流变性研究，给出了聚驱油井产出液粘度计算公式；其次建立了抽油杆柱受力模型及上、下冲程阻力计算模型，得出采出液流变性是影响悬点载荷变化的重要因素；推导了计算抽油杆屈曲变形的临界载荷公式的系数，得出抽油杆柱轴向分布力和抽油杆直径是影响临界载荷的主要变量，进而对防偏措施，主要是下加重杆及扶正器，进行了设计与计算；并根据以上理论编制了聚驱抽油机井杆管偏磨诊断分析和防偏磨措施设计系统软件，分析了偏磨影响因素，通过对现场实际数据的检验，符合率较高，表明该软件理论正确，设计合理，实用性强，对聚驱采油井延长检泵周期具有重要的指导意义。更多还原

【Abstract】 A problem has been put forward that the rate and degree of eccentric wear between sucker rod and oil tube aggravated in polymer flooding wells than which in water flooding wells since polymer wells put into production in Daqing oil field. The main reason is that the viscosity of produced liquid increases in polymer flooding wells than water flooding wells, it makes for all the frictional resistances increased correspondingly, the result is the maximal load become larger during upstroke and the minimum load become smaller during downstroke than water flooding after polymer output from polymer flooding well, force status of the rod turn too bad, and the lengthways buckling load increased in downstroke, make the buckling numbers brought by lose stability of sucker rod also increased, eccentric wear between sucker rod and oil tube become serious, the rate of sucker rod broken be increased, operating wells obvious add a lot, so it must influence the production of polymer flooding well. While operating charge increase, and the production cost enhanced also.This paper aimed at the problem, carry through the mechanism analysis of eccentric wear between sucker rod and oil tube for polymer flooding, based on datum on-site and educed influencing factors of eccentric wear. At first, study rheological property of produced liquid in polymer flood well, presented the formula of viscosity calculation of produced liquid; Second established the force model of sucker rod and the resistance calculating model on up and down stroke, we can conclude that the rheological property of produced liquid is an important factor to influence the hanging load; Educed the coefficient of critical load equation while sucker rod flexure transformed, the conclusion is that the distributing force along the axis direction and the diameter of sucker rod are main variables to influence critical load, advanced to bring forward measures of protection eccentric wear, mainly is lower sinker rod and centralizer, and based on the above-mentioned theories, programmed the software of eccentric wear, analyzed the influencing factors, through verified by datum on-site, the rate of accordance can be reached 80% or so, it can well direct the work of oil field.更多还原