连续油管压裂技术在辽河外围低渗油藏的应用

连续油管水力喷射压裂是解决纵向多层压裂难题的有效手段。通过对连续油管水力喷射环空压裂技术的原理、工艺流程、摩阻、优缺点评价等方面进行分析,认为这种环空加砂压裂通过连续油管内喷砂射孔与环空加砂相结合的方式拓展了连续油管的应用深度,提高了连续油管的利用率,降低了对水力喷射喷嘴寿命的要求,提高了连续油管压裂的排量限制,从而使连续油管具有更高的现场适用性。辽河油田采用国内自主连续油管设备、井下工具,自主设计、组织实施了一次连续油管水力喷射环空加砂分段压裂,取得了良好的效果,获得了大量的宝贵经验。     

下寺湾油田柳洛峪区长8油层组裂缝特征与开发效果关联评价

利用构造应力场的研究结果,结合岩心薄片观测和测井解释资料,本文对下寺湾油田柳洛峪区长8油层组裂缝特征进行了综合研究。结果表明：研究区长8储层微裂缝以构造缝为主,占微裂缝总数的70%;大部分为全充填缝（即闭合缝）;充填物成分主要为泥质,少数为方解石和铁质及其它充填物;压裂施工过程中当油井不存在过井天然缝时,压裂过程中破压明显,产生新人工缝。当存在过井天然缝时,压裂过程中破压不明显,人工缝沿天然裂缝延伸。长8层的裂缝方位与构造最大主应力方向一致,均为为北偏东70°左右。     

燃气透平IGV液压油管振动原因分析

燃气透平入口导叶IGV液压油上油管振动剧烈,多次引发裂纹或断裂造成机组停车。为消除这一影响合成氨装置安全运行的重大隐患,相继采取了例如更换油泵、阀门及油管的一系列措施,最后彻底解决。     

一种用于水基压裂液伤害性评价的型煤制备方法

目前对于水基压裂液伤害性评价的方法主要是针对碎屑岩,没有专门针对煤的评价方法,就其原因在于难以制备实验用的煤心,也没有统一的制样方法。由于部分煤样裂缝发育、结构疏松难以制成柱塞样品最终导致伤害实验无法完成。因此,在大量实验的基础上我们采用四步制样法挑选出粒度为40目~70目的煤样,用30 MPa~40MPa的制样压力将煤样压制成型煤煤心,并利用热收缩管和导流垫块对煤心封装成形。通过该方法制备成的型煤煤心既克服了以往样品装卸困难,也保证了实验的重复性和数据的可考性,用该方法制备的型煤煤心已成功应用于水基压裂液对煤层伤害性评价。     

腔体数量对压电装置性能的影响

为确定腔体数量对压电泵和压电液压驱动器性能的影响,制作双腔至九腔串联压电装置并进行试验。结果表明：压电泵的输出随腔体数量增加而提升。压电泵的输出流量以腔数5个为界限,输出压力以腔数6个分界。腔数低于此数时,每增加一个腔室,二者均提升显著,流量最大可提升2.42倍,压力最大可提升1.96倍;腔数高于此数时,提升幅度较低。压电液压驱动器的输出速度/输出推力以腔体数量5为界,低于此数时,驱动器输出随腔数增加提升的幅度大;腔数在5以上时,提高幅度变小,但增量基本一致。驱动器负载时,随着腔数增加,输出能力和负载能力也逐渐提高。且在260 Hz、腔体数量高于5、负载低于15 N时,二者近似成正比。     

基于ADAMS的重载液压机械臂动力学建模与仿真

针对七自由度重载液压机械臂,建立精确、高效的重载液压机械臂系统逆动力学模型。利用牛顿-欧拉递推法、Spong柔性关节模型和Stribeck摩擦模型建立机械臂动力学模型;利用Creo完成机械臂三维模型搭建并导入ADAMS分析计算。与试验结果对比,确定系数均大于0.6,与无摩擦纯刚体模型计算结果相比有明显提升,验证了建模方法的准确性。     

铝加工厂液压油系统的化学清洗

介绍了轧机液压油系统的特点,并通过中国铝业陇西铝厂的清洗实例,对经过油运二次污染后的液压油系统清洗进行详细介绍,并总结清洗中的注意事项。     

TDI双管板换热器制造质量的控制简

介绍了TDI双管板换热器的结构特点和深孔强度胀接技术。简述了制造过程中的质量控制关键点。通过用模拟管板进行了内管板胀接工艺评定的方法,采取了控制管孔加工精度、强度胀接、管板组装、调整开槽间距及宽度、安排合理的胀接焊接次序、选择合适的胀接压力等措施;采用了新的检验和检测技术,保证了产品质量;增设了压力传感器,完善了安全监测系统。     

Simulation of the interactions between hydraulic and natural fractures using a fracture mechanics approach

HYDROCK method aims to store thermal energy in the rock mass using hydraulically propagated fracture planes. The hydraulic fractures can interact with the pre-existing natural fractures resulting in a complex fracture network, which can influence the storage performance. This study investigates the interactions between hydraulic and natural fractures using a fracture mechanics approach. The new functionality of the fracture mechanics modelling code FRACOD that enables crossing of hydraulically driven fracture by a pre-existing fracture is presented. A series of two-dimensional numerical models is prepared to simulate the interaction at different approach angles in granitic rock of low permeability. It is demonstrated that multiple interaction mechanisms can be simulated using the fracture mechanics approach. The numerical results are in agreement with the modified Renshaw and Pollard analytical criterion for fracture crossing. The results show that for large approach angles, the hydraulic fracture crosses the natural fracture, whereas for small approach angles, the hydraulic fracture activates the natural fracture and the wing-shaped tensile fractures are propagated from its tips. Thus, the presence of fractures with low dip angles can lead to the growth of more complex fracture network that could impair the thermal performance of the HYDROCK method.     

An overview of particle-based numerical manifold method and its application to dynamic rock fracturing

This review summarizes the development of particle-based numerical manifold method (PNMM) and its applications to rock dynamics. The fundamental principle of numerical manifold method (NMM) is first briefly introduced. Then, the history of the newly developed PNMM is given. Basic idea of PNMM and its simulation procedure are presented. Considering that PNMM could be regarded as an NMM-based model, a comparison of PNMM and NMM is discussed from several points of view in this paper. Besides, accomplished applications of PNMM to the dynamic rock fracturing are also reviewed. Finally, some recommendations are provided for the future work of PNMM.