模拟套管固井滑套工况下冲蚀实验方案设计

发布时间：2019-05-17 11:11

【摘要】：新研发的井下工具必须经严格实验检验才能投放现场,因此,实际工况的准确模拟显得尤为重要。针对固井滑套在压裂时具有大排量与高含砂比的特点,设计了四泵串并联方式的工况模拟实验模型。根据实验条件,先假设冲蚀实验设备连接方案为两泵并联方式,而理论计算得出泵为管路所提供的扬程需达到35.82 m,与实测单台离心泵Q H特性曲线相结合,最终确定了设备连接方案为四泵串并联方式。通过监测模拟冲蚀实验中的排量与含砂比,结果表明,所设计的实验方案能够满足模拟大排量(4.5～7.0 m3/min)、高含砂比(体积比25%)的冲蚀要求且存在较大余量;同时得出进行压裂作业时不同孔眼数的滑套对管路整体压力损耗、实验流量、泵送能力等影响明显。
[Abstract]:The newly developed downhole tools must be strictly tested before they can be put on the spot, so it is particularly important to simulate the actual working conditions accurately. In view of the characteristics of large displacement and high sand content in fracturing, a working condition simulation experimental model of four pumps in series and parallel mode is designed. According to the experimental conditions, it is assumed that the connection scheme of the erosion experimental equipment is the parallel mode of the two pumps, and the theoretical calculation shows that the lift provided by the pump for the pipeline needs to reach 35.82 m, which is combined with the measured Q-H characteristic curve of a single centrifugal pump. Finally, the equipment connection scheme is determined to be a series-parallel mode of four pumps. By monitoring the ratio of displacement to sand content in the simulated erosion experiment, the results show that the designed experimental scheme can meet the simulated large discharge (4.5 m3/min). The erosion requirement of high sand content ratio (volume ratio 25%) is high and there is a large margin. At the same time, it is concluded that the sliding sleeve with different number of holes has obvious influence on the overall pressure loss, experimental flow rate and pumping capacity of the pipeline.
【作者单位】：西南石油大学机电工程学院;中国石化石油工程技术研究院;
【分类号】：TE931.2

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