海上油井井筒结蜡剖面预测新模型

发布时间：2018-09-11 14:46

【摘要】：为了缓解井筒结蜡给海上油田油气开采造成的消极影响,研究了海上结蜡油井的蜡质沉积规律,并建立了一种海上油井井筒结蜡剖面预测新模型。该模型基于对4种现有模型的机理分析,采用理论与试验相结合的方法,综合考虑了分子扩散、剪切弥散和蜡层的老化与剥蚀损失等结蜡机理。通过实例对新模型与4种现有模型的结蜡剖面预测结果进行了对比分析,并结合渤海油田海上结蜡油井的生产数据,检验了新模型对结蜡井筒流体温度和压力的计算精度,新模型计算井口温度的相对误差为1.32%,计算井下压力的相对误差为0.30%,计算精度良好;利用新模型分析了生产时间、产量、含水率和生产气油比等影响结蜡因素的敏感性,认为结蜡厚度随生产时间递增,受产量和含水率的影响较大,受生产气油比的影响相对较小。研究结果表明,新模型能够较为准确地预测海上结蜡电动潜油离心泵油井井筒的结蜡剖面,可以为海上电潜泵结蜡井的清蜡防蜡工艺优选与实施提供指导。
[Abstract]:In order to alleviate the negative effect of wellbore wax deposition on oil and gas production in offshore oil fields, the waxy deposition law of offshore waxy oil wells is studied, and a new model for prediction of waxy profile in offshore wells is established. Based on the mechanism analysis of four existing models, the waxing mechanism such as molecular diffusion, shear dispersion, aging and denudation loss of wax layer is considered by combining theory with experiment. The prediction results of waxing profile between the new model and four existing models are compared and analyzed through an example. Combined with the production data of offshore waxy oil wells in Bohai Oilfield, the accuracy of the new model for calculating fluid temperature and pressure in waxy wellbore is tested. The relative error of the new model for calculating wellhead temperature is 1.32 and the relative error for calculating downhole pressure is 0.30. The new model is used to analyze the sensitivity of the factors affecting wax deposit, such as production time, production rate, water cut and ratio of gas to oil, etc. It is considered that the wax deposit thickness increases with the production time, which is influenced by the yield and water content, but less by the ratio of gas to oil. The results show that the new model can accurately predict the waxing profile of the well bore of the electric submersible oil centrifugal pump, and can provide guidance for the optimization and implementation of the waxing and anti-waxing technology of the offshore electric submersible pump waxing well.
【作者单位】：中海油能源发展股份有限公司工程技术分公司;中国石油大学(华东)石油工程学院;
【基金】：中海油能源发展股份有限公司科研项目“渤海油田油水井结蜡结垢预测及防治工艺研究”(编号:GCJSLZBG-1605)部分研究内容
【分类号】：TE53

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