Ansys在射孔完井中的应用

本文详尽的介绍了在Ansys软件平台下裸眼完井和射孔完井有限元三维模型的建立及网格划分方法。用热流场模拟渗流场,用无限大导热材料模拟井筒和孔眼,可以很好的模拟射孔完井渗流场。利用所建模型分析了裸眼完井和射孔完井的渗流场速度分布,分别得出了其出口处的面流量,然后计算了产率比。另外编写了APDL语言,可以方便的修改射孔完井参数和地层参数,以更快捷的方式来预测产率比。     

数字正交解调在定点DSP上的实现

将数字正交解调算法应用到船用无线气象传真机的数字化信号处理平台上,对传真信号进行解调。对解调算法进行仿真验证并基于定点数字信号处理器DSP芯片对算法进行了实现。仿真和实验结果表明,开发的信号处理平台工作稳定可靠,算法可以实现对相信号解调,验证了方案的可行性和正确性。     

A sand production prediction model for weak sandstone reservoir in Kazakhstan

Weakly consolidated reservoirs are prone to sand production problem,which can lead to equipment damages and environmental issues.The conditions for sand production depend on stresses and properties of rock and fluid.Accurate sand volume estimation is,however,still a challenging issue,especially for reservoirs in weak formations.The weak reservoirs containing viscous or heavy oil are mainly discovered in shallow depths in Kazakhstan,with moderate temperature and pressure.Many prediction models developed for open-hole completions where the reservoir materials usually possess certain strength are not applicable for the local reservoirs where the materials are significantly weaker even if casing is used to support the wellbore with oil produced through the perforation tunnels.In this context,a prediction model was proposed where the volume of the produced sand was estimated as the volume of the plastic zone of the failed materials surrounding the perforation tunnels.The model assumes an evolving truncated conical shape for the damage zone and takes into account stress distributions and shear failure in this zone.Then,the proposed model was used to estimate sand volumes in 20 wells during oil production with sequential increase of flow rates.The predictions match well with the measured sand volumes in a local oil field.Finally,a sensitivity analysis was conducted on the model performance.It shows that the permeability of the plastic zone was the most significant controlling factor in the prediction results.     

国有大型油气企业矿权流转机制及建议

2017年,我国出台了《关于深化石油天然气体制改革若干意见》,随后有关部门又相继出台了一系列油气体制改革新政,其中加强油气矿权流转就是落实上述改革的重要内容之一。在油气体制改革的背景下,研究国有大型油气企业矿权流转机制,分析流转过程中出现的问题进而提出解决路径,既有必要性更有紧迫性。为此,结合其他国家矿权管理和国际石油公司矿权流转的主要做法,基于我国油气矿权流转政策、竞争性出让和流转实践,提出了国有大型油气企业矿权流转的基本思路、机制及措施建议。结论认为:①应遵循分级、分类、分阶段的指导思想,总体上坚持市场化的原则,按照"四类别、三方式、两阶段"的思路进行矿权流转框架设计;②成立矿权管理领导小组,建立专业化风险勘探公司,完善矿权流转决策机制,健全矿权流转管理办法;③应持续加强Ⅰ类和Ⅱ类区块的矿权保护和内部流转,近期加强重点保障区块专项投入、创新勘探与未动用储量项目管理体制机制、创新甲乙方合作运行机制等,远期探索积极有效的矿权管理制度、建立矿权保护和流转的长效联动机制、培育竞争有序的内部矿权市场;④稳健开展Ⅲ类区块的合资合作,如适当增加合作勘探开发矿权比重,重点关注海上及深水项目合作勘探开发等;⑤逐步探索Ⅳ类区块的外部竞争性流转,近期结合国家资质审批进展逐步扩大流转范围,远期实现市场化竞争性流转。     

外围油田埋地金属管道腐蚀穿孔原因及控制建议

管道作为大量输送石油、水、气体等介质的最为安全经济的方法在油田得到广泛应用,而输送油、气的管道大多处于复杂的土壤环境中,所输送的介质也多有腐蚀性,因而管道内壁和外壁都可能遭到腐蚀。据统计,采油九厂在2008、2009年平均每年更换腐蚀老化管线10.25 km,而在2010年更换腐蚀老化管线达到了15.195 km,可以说管线腐蚀问题,已经严重的影响到油田的正常生产。本文对龙虎泡油田腐蚀管线的成因进行分析并对采油九厂阴极保护实施效果进行评价,得出了外围油田埋地金属管道腐蚀穿孔的主要原因,并提出了相应的腐蚀穿孔控制建议,为管道安全输送提供技术保障。     

浅析高感应电压输电线路的定相及绝缘测试

针对输电线路感应电压较高的特点,介绍几种高感应电压输电线路定相及绝缘试验方法,并进行分析比较.现场实测分析表明,降低感应电压后直接用兆欧表的测试方法对人身和设备安全都有保障.     

An analytical model for perforation of ceramic/multi-layered planar woven fabric targets by blunt projectiles

An analytical model has been developed in this paper for perforation of ceramic/multi-layer woven fabric targets by blunt projectiles. In previous Chocron–Galvez analytical model the semi-angle of ceramic conoid is constant and the strain rate effects are also neglected in the stress–strain behavior of the yarns and only strain energy absorbed by the yarns is considered.     

Comparative analysis of perforation models of metallic plates by rigid sharp-nosed projectiles

Based on the mode of ductile hole enlargement, the present paper compares the models of a rigid sharp-nosed projectile perforating the ductile metallic target plate, given by Chen and Li [1] and Forrestal and Warren [2], respectively. It indicates that the formulae of ballistic limit and residual velocity of these two perforation models are consistent in form but with different applicable range, which due to them employing the spherical cavity expansion theory and cylindrical cavity expansion theory, alternately. Further analyses are conducted to discuss the effects of target material and plate thickness on the terminal ballistic performance with referring the experimental results of aluminum alloy and Weldox E steel plates. It is confirmed that the perforation mechanisms may transform with increasing the plate thickness and the strength of target material.     

大红山铁矿采区贯通后的围岩应力重分布监测

为研究大红山铁矿围岩应力分布特征，以大红山铁矿两个特大采区逐步因爆破而贯通这一特殊工程背景，在探究围岩应力分布机理的基础上，通过对微震监测和应力监测结果进行分析，重点研究了采区贯通后围岩应力重分布情况。研究结果表明：位于中II采区南部的采空区围岩体中以应力增加为主，应力增加的程度与离采空区的远近呈反比，但是在靠近采空区约20 m左右的近距离范围内产生了一定程度的卸载，结合现场观察来看，该区域岩体受力变形破裂较严重；南翼采区440 m分段、420 m分段相继回采的过程中，围岩内的应力增加速度开始明显变大，应力增加程度增大，部分临近采空区的围岩从卸载变为应力增加；中II采区下方，即南翼采区的南部区域的围岩以应力卸载为主，这对南翼回采中布置在下盘的回采进路与沿脉干线的稳定性有益，除了会受矿体回采的扰动应力外，采空区贯通产生的扰动应力对这些区域的巷道影响较小.     

京沪高铁无锡东站站区配套工程建筑设计特点分析

京沪高铁无锡东站站区配套工程作为一个多交通模式相结合的交通综合配套工程,其建筑设计特点主要包括:以轨道线高铁和地铁为中心、以竖向换乘为主导的站区布局;零换乘的设计;多种节能措施的使用及可再生能源的利用;灵活分期与预留接口等。