针对井眼状况、作业管柱结构、修井液性能、套磨铣施工参数等维度,分析了套磨铣作业对套管损伤机理,建立了套磨铣作业设计方法,开发了套磨铣作业管柱力学分析及参数优化设计软件,实现了井眼轨迹计算、管柱力学分析、扭矩及拉力计算、套

针对同井注采系统井下封隔锚定失效检测困难且时效性差,造成生产及能源浪费的问题,研究了一种井下油管封隔锚定松脱预警方法,并开发了相应的同井注采系统封隔失效检测装置。通过检测井口套管应变以及受力状况,推导油管受力情况,从而分析判断井下封隔锚定装置的工作状态。基于WIN CE嵌入式操作系统开发了便携式油管封隔锚定失效预警检测仪器,以12V蓄电池作为能源,在井口套管贴应变片组成惠斯通电桥,以此测量井口套管应变,利用油管封隔锚定失效预警检测仪器采集并记录井口套管应变数据,通过对比井口套管应变历史数据,即可判定井下油管锚定工作状况。在对30口同井注采井的长期监测中,发现4口井的坐封载荷远低于坐封时加载的载荷,判定这4口井属于封隔锚定失效井,这与实际情况相符。现场测试结果表明该仪器可以及时预警井下封隔锚定装置松脱故障,有效指导生产,提高经济效益。

针对我国油田抽油机井系统效率低和能耗大的问题,首先对进油阀的结构、开启程度、流量系数、流体过阀流动形态划分及阀球直径进行计算分析,确定进油阀球直径为38. 1mm。然后建立了抽油泵进油阀实体模型和流体域模型,结合有限元仿真技术,对抽油泵阀隙流进行了数值模拟,分析了流量、液体黏度和密度等因素对液体过阀流动规律的影响,采用二元线性回归方法得出进油阀流量系数与雷诺数、泵阀开启程度的函数关系。研究结果表明:进油阀球室越高,开启程度越大,流体阻力压降损失越小,但当泵阀开启程度大于0. 8时,对流体过阀流动性能的影响很小,因此球室高度只需限制开启程度略大于0. 8即可,即球室高度不小于阀球直径的1. 25倍。研究结果可进一步推动抽油泵泄漏理论的研究,也可为抽油泵的结构改进和效率提高提供理论依据。

潜油电泵用旋转式气液分离器具有分离效率高、结构紧凑等优点,并广泛应用于含气油田油井的开采。利用CFD技术对分离器内流流道进行了数值仿真,获得了气体分数在流场内的分布情况,以及压力场和速度场,结果表明CFD计算结果很好地诠释了气液分离器的分离机理和内流道两相流的流动情况,为分离器的优化设计和改型设计提供了一种科学的计算工具。

中国油气资源品位呈劣质化趋势,主力老油田普遍进入特高含水期,油田进入到深度精细开发的新阶段。高校和油气生产企业联合技术攻关,开展了精细化、智能化分层注采工艺技术研究,研制了注采生产调控系统,提升了油气生产全局洞察、优化决

天然裂缝或层理等弱界面的剪切破坏是体积压裂裂缝网络形成的关键因素。利用数字散斑相关技术,通过三点弯曲构建了Ⅰ型裂缝经过弱界面时的扩展特性实验,获得了试件表面位移场和应变场的变化规律。实验结果表明:Ⅰ型裂缝扩展至弱界面层后,裂缝发生短暂停滞扩展,裂缝尖端张开位移迅速增加,Ⅰ型裂缝尖端钝化,弱界面剪切应变迅速增加,裂缝由Ⅰ型裂缝转变为Ⅰ--Ⅱ复合型裂缝并转向扩展。

The difficulty of collecting fault data samples is one of the application problems of the deep learning method in fault diagnosis of mechanical production; the second is that when the depth of the learning network increases, the network accuracy is saturated or even decreased. Therefore, based on the deep learning algorithm and the DenseNet model, this paper establishes a fault diagnosis model for the beam pumping unit through the transfer learning method. The model uses the global pooling layer as the classifier. The model is used to classify and test various working conditions such as wax deposition, pump leakage, insufficient liquid supply, and pump leakage in oil wells. The results show that the model can obtain a classification model with high accuracy by learning a limited number of sample data; in the case of uneven data samples, the model can also basically complete the task classification task accurately. Through the evaluation of the test set, the model has an average accuracy of more than 95% in identifying various working conditions.

With the development of hydraulic system to high pressure gradually, the leakage risk of sealing system increases, and it is necessary to confirm the performance parameters of sealing structure through analysis and calculation. The traditional analysis of the friction and wear performance of the seal ring is limited to the amount of wear, and cannot describe the surface wear characteristics of the O-ring in detail. Based on the Archard model, this paper constructs a model to analyse and calculate the friction and wear performance of the dynamic seal structure through the material characteristics and operating parameters, analyses the friction and wear characteristics of the O-ring seal structure under different compression ratio, medium pressure, relative slip velocity and temperature, and summarizes the influence of each single variable on the wear characteristics of the dynamic seal structure. According to the analysis in this paper, the increase of medium pressure of 5 MPa will cause the wear concentration area of the contact surface to move to the back pressure side, and the overall wear will be reduced, but the increase of contact area will lead to the weakening of sealing effect. By the action of 15 MPa, when the compression ratio is between 5% and 10%, the change of cumulative wear rate and the wear rate of each node is small.

针对多级滑片泵在输送高含气量流体时发生的空化现象,研究流体气相体积分数对多级泵流场的影响。采用专业的泵仿真软件对多级滑片泵内部流场进行了数值模拟,结果表明:随着流体气相体积分数从10%增至20%,容积效率逐渐降低,瞬时流量脉动

The "Oil and Gas Water Well Production Data Management System Database" provides great assistance for oilfield production, monitoring, and management. However, due to the harsh conditions of oil field wells and the lack of some test data, traditional management methods are no longer suitable for present condition. At the same time, optimization analysis for a single oil well has a high cost and low efficiency, and it is difficult to achieve the modern management goal of large-scale pumping well groups. In this paper, the grey correlation method is used to analyze the direct correlation between the influencing factors and the system efficiency, surface equipment driving efficiency, and wellbore lifting efficiency, and the improvement method against factors with strong correlation is prioritized. A multi-node evaluation index system for pumping well systems and corresponding improvement methods were constructed, and evaluation software was compiled. This technology considers the running condition of the pumping unit in one oil field block, and selects the oil wells to be improved according to the evaluation index, and puts forward the targeted improvement methods according to the common problems of the oil well. This paper provides a set of reliable technical methods for the efficient management of the oil well in the oil field block. © 2021, Strojarski Facultet. All rights reserved.