内置电缆对连续抽油管内流体状态的影响规律研究

发布时间：2018-01-17 13:27

本文关键词：内置电缆对连续抽油管内流体状态的影响规律研究　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：潜油泵采油系统效率高,能耗低,在国内外得到广泛应用。内置电缆的连续抽油管,作为潜油泵采油系统中重要的组成部分,会改变原油采收过程中的流动特征,直接影响潜油泵的选型及采油作业效率。因此在实际深井抽油过程中有必要对内置电缆连续抽油管内的流体流动进行研究,以便对现场采油装置及参数的选择提供依据。首先建立无电缆连续抽油管和内置电缆连续抽油管内流体流速、压降的理论分析模型,在此基础上,在流量恒定为0.890 m~3/h的情况下,进行了无电缆、内置同心电缆连续抽油管内原油流场数值模拟,得到电缆对管内流体流态影响不大,流速降低,压降增大。并分析了入口流量从0.099 m~3/h增加至2.070 m~3/h时,流场的变化规律。当内置电缆弯曲度从0.000增加到0.990时,得到出现二次流的最小电缆弯曲度为0.297,且宽间隙处流速峰值逐渐增大,窄间隙区流速峰值逐渐减小。在内置电缆弯曲度为0.594时,随着弯曲井段长度由3m增加到80m,连续抽油管内宽间隙处流速峰值、窄间隙区流速峰值基本不变,但压降的增大。同时进行了原油流动实验,通过观察无电缆、内置电缆连续抽油管内流体流动的流态、监测对应工况下的压力的变化值,得到的实验结果与数值模拟结果、理论计算值基本吻合,验证数值模拟计算结果的可靠性。本文的研究获得了内置电缆对连续抽油管内原油流动状态的影响规律及内置电缆连续抽油管内流体流动的影响因素,对以后在钻井工程以及其他领域中遇到此类问题的研究具有现实意义。
[Abstract]:The submersible pump oil recovery system has high efficiency and low energy consumption, which is widely used at home and abroad. The continuous pumping pipe with built-in cable is an important part of the submersible pump oil recovery system. It will change the flow characteristics of crude oil recovery process and directly affect the type selection of submersible pump and the efficiency of oil recovery. Therefore, it is necessary to study the fluid flow in the continuous tubing with built-in cable during the actual deep well pumping process. In order to provide the basis for the selection of field oil recovery equipment and parameters. Firstly, the theoretical analysis model of fluid velocity and pressure drop in continuous tubing without cable and in continuous tubing with built-in cable is established. Under the condition of constant flow rate of 0.890 mm2 / h, the numerical simulation of the crude oil flow field in the continuous tubing without cable and concentric cable is carried out, and the results show that the cable has little effect on the fluid flow in the tube. The flow rate decreased and the pressure drop increased, and the inlet flow rate increased from 0.099 mt3 / h to 2.070 mm3 / h. When the bending degree of built-in cable increases from 0.000 to 0.990, the minimum cable bending with secondary current is 0.297, and the peak velocity increases gradually at wide gap. The peak velocity in narrow gap region decreases gradually. When the bending degree of built-in cable is 0.594, with the length of curved well section increasing from 3m to 80m, the peak velocity at wide gap in continuous pumping pipe is obtained. The peak velocity in narrow gap region is almost unchanged, but the pressure drop increases. At the same time, the crude oil flow experiment is carried out, and the fluid flow pattern in the continuous tubing with no cable and built-in cable is observed. Monitoring the change of pressure under corresponding working conditions, the experimental results are in good agreement with the numerical simulation results. Verify the reliability of numerical simulation results. In this paper, the influence of built-in cable on the flow state of crude oil in continuous tubing and the influence factors of fluid flow in continuous tubing of built-in cable have been obtained. It is of practical significance to study such problems in drilling engineering and other fields.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE933.8

【相似文献】