Study of inter-well interference in shale gas reservoirs by a robust production data analysis method based on deconvolution

In order to overcome the defects that the analysis of multi-well typical curves of shale gas reservoirs is rarely applied to engineering,this study proposes a robust production data analysis method based on deconvolution,which is used for multi-well inter-well interference research.In this study,a multi-well conceptual trilinear seepage model for multi-stage fractured horizontal wells was established,and its Laplace solutions under two different outer boundary conditions were obtained.Then,an improved pressure deconvolution algorithm was used to normalize the scattered production data.Furthermore,the typical curve fitting was carried out using the production data and the seepage model solution.Finally,some reservoir parameters and fracturing parameters were interpreted,and the intensity of inter-well interference was compared.The effectiveness of the method was verified by analyzing the production dynamic data of six shale gas wells in Duvernay area.The results showed that the fitting effect of typical curves was greatly improved due to the mutual restriction between deconvolution calculation parameter debugging and seepage model parameter debugging.Besides,by using the morphological characteristics of the log-log typical curves and the time corresponding to the intersection point of the log-log typical curves of two models under different outer boundary conditions,the strength of the interference between wells on the same well platform was well judged.This work can provide a reference for the optimization of well spacing and hydraulic fracturing measures for shale gas wells.

Inter-well internal resonance analysis of rectangular asymmetric cross-ply bistable composite laminated cantilever shell under transverse foundation excitation

The chaotic dynamic snap-through and complex nonlinear vibrations are investigated in a rectangular asymmetric cross-ply bistable composite laminated cantilever shell,in cases of 1:2 inter-well internal resonance and primary resonance.The transverse foundation excitation is applied to the fixed end of the structure,and the other end is in a free state.The first-order approximate multiple scales method is employed to perform the perturbation analysis on the dimensionless two-degree-of-freedom ordinary differential motion control equation.The four-dimensional averaged equations are derived in both polar and rectangular coordinate forms.Deriving from the obtained frequency-amplitude and force-amplitude response curves,a detailed analysis is conducted to examine the impacts of excitation amplitude,damping coefficient,and tuning parameter on the nonlinear internal resonance characteristics of the system.The nonlinear softening characteristic is exhibited in the upper stable-state,while the lower stable-state demonstrates the softening and linearity characteristics.Numerical simulation is carried out using the fourth-order Runge-Kutta method,and a series of nonlinear response curves are plotted.Increasing the excitation amplitude further elucidates the global bifurcation and chaotic dynamic snap-through characteristics of the bistable cantilever shell.

基于Packet Tracer的虚拟医疗网络设计与性能分析

在Packet Tracer模拟环境中针对虚拟医疗网络进行设计与性能分析。系统需求与设计部分详细考虑了医疗网络的功能需求、拓扑设计和安全性措施。通过Packet Tracer模拟环境的建立,成功模拟了医院内部网络、医疗设备网络和远程连接,符合实际医疗场景。在性能分析中,使用Packet Tracer工具对带宽、延迟、安全性和可靠性进行了全面评估。通过优化网络配置,确保实时医疗应用的高效运行,同时强调了网络的安全性和可靠性。这一综合性的设计和性能分析为虚拟医疗网络的实际部署提供了有力的支持。

Inter-well interferences and their influencing factors during water flooding in fractured-vuggy carbonate reservoirs

Based on the characteristics of injection-production units in fractured-vuggy carbonate reservoirs,nine groups of experiments were designed and performed to analyze the interference characteristics and their influencing factors during water flooding.Based on percolation theory,an inversion model for simulating waterflooding interferences was proposed to study the influence laws of different factors on interference characteristics.The results show that well spacing,permeability ratio,cave size,and cave location all affect the interference characteristics of water flooding.When the cave is located in high permeability fractures,or in the small well spacing direction,or close to the producer in an injection-production unit,the effects of water flooding are much better.When the large cave is located in the high-permeability or small well spacing direction,the well in the direction with lower permeability or smaller well spacing will see water breakthrough earlier.When the cave is in the higher permeability direction and the reserves between the water injector and producer differ greatly,the conductivity differences in different injection-production directions are favorable for water flooding.When the injection-production well pattern is constructed or recombined,it’s better to make the reserves of caves in different injection-production directions proportional to permeability,and inversely proportional to the well spacing.The well close to the cave should be a producer,and the well far from the cave should be an injector.Different ratios of cave reserves to fracture reserves correspond to different optimal well spacings and optimal permeability ratios.Moreover,both optimal well spacing and optimal permeability ratio increase as the ratio of cave reserves to fracture reserves increases.

Inter-Well Coupling and Resonant Tunneling Modes of Multiple Graphene Quantum Wells

We investigate the inter-well coupling of multiple graphene quantum well structures consisting of graphenesuperlattices with different periodic potentials.The general form of the eigenlevel equation for the bound states of thequantum well is expressed in terms of the transfer matrix elements.It is found that the electronic transmission exhibitsresonant tunneling peaks at the eigenlevels of the bound states and shifts to the higher energy with increasing the incidentangle.If there are N coupled quantum wells,the resonant modes have N-fold splitting.The peaks of resonant tunnelingcan be controlled by modulating the graphene barriers.

A Long-Time-Step-Permitting Tracer Transport Model on the Regular Latitude–Longitude Grid

If an explicit time scheme is used in a numerical model, the size of the integration time step is typically limited by the spatial resolution. This study develops a regular latitude–longitude grid-based global three-dimensional tracer transport model that is computationally stable at large time-step sizes. The tracer model employs a finite-volume flux-form semiLagrangian transport scheme in the horizontal and an adaptively implicit algorithm in the vertical. The horizontal and vertical solvers are coupled via a straightforward operator-splitting technique. Both the finite-volume scheme's onedimensional slope-limiter and the adaptively implicit vertical solver's first-order upwind scheme enforce monotonicity. The tracer model permits a large time-step size and is inherently conservative and monotonic. Idealized advection test cases demonstrate that the three-dimensional transport model performs very well in terms of accuracy, stability, and efficiency. It is possible to use this robust transport model in a global atmospheric dynamical core.

Efficacy and prognostic analysis of carbon nanotracers combined with the da Vinci robot in the treatment of esophageal cancer

BACKGROUND Traditional methods cannot clearly visualize esophageal cancer(EC)tumor contours and metastases,which limits the clinical application of da Vinci robotassisted surgery.AIM To investigate the efficacy of the da Vinci robot in combination with nanocarbon lymph node tracers in radical surgery of EC.METHODS In total,104 patients with early-stage EC who were admitted to Liuzhou worker's Hospital from January 2020 to June 2023 were enrolled.The patients were assigned to an observation group(n=52),which underwent da Vinci robot-assisted minimally invasive esophagectomy(RAMIE)with the intraoperative use of nanocarbon tracers,and a control group(n=52),which underwent traditional surgery treatment.The operation time,intraoperative blood loss,postoperative drainage tube indwelling time,hospital stay,number of lymph nodes dissected,incidence of complications,and long-term curative effects were comparatively analyzed.The postoperative stress response C-reactive protein(CRP),cortisol,epinephrine(E)and inflammatory response interleukin(IL)-6,IL-8,IL-10,and tumor necrosis factor-alpha(TNF-α)were evaluated.RESULTS Compared with the control group,the observation group had significantly lower postoperative CRP,cortisol,and E levels(P<0.05)with a milder inflammatory response,as indicated by lower IL-6,IL-10,and TNF-αlevels(P<0.05).Patients who underwent RAMIE had less intraoperative blood loss and shorter operation times and hospital stays than those who underwent traditional surgery.The average number of dissected lymph nodes,time of lymph node dissection,and mean smallest lymph node diameter were all significantly lower in the observation group(P<0.05).The rate of postoperative complications was 5.77%in the observation group,significantly lower than the 15.38%observed in the control group.Furthermore,the lymphatic metastasis rate,reoperation rate,and 12-and 24-month cumulative mortality in the observation group were 1.92%,0%,0%,and 0%,respectively,all of which were significantly lower than those in the control group(P<0.05).CONCLUSION The treatment of EC using the da Vinci robot combined with nanocarbon lymph node tracers can achieve good surgical outcomes and demonstrates promising clinical applications.

基于PacketTracer和Onenet的物联网家居系统

针对实物物联网家居成本过高、搭建过程复杂的问题,文中使用PacketTracer和OneNet云平台设计了一种物联网智能家居系统。该系统使用PacketTracer方法进行了设计,并通过MCU将智能家居设备远程接入OneNet云平台。测试结果表明,与传统的实物物联网家居相比,该系统不仅缩短了设计周期,还能实现对家居设备的远程控制。

基于Packet Tracer的智慧校园网络设计及仿真

为了适应现代教育的发展,对传统校园网络进行智能化改造。针对智慧校园网络的需求,着重介绍了设计思路,并使用Packet Tracer网络仿真软件构建了智慧校园网络模型,利用冗余设计、端口聚合、负载均衡等技术使校园网络更加可靠、稳定。该模型主要利用多种传感器、物联网服务器、SBC/MCU微处理器以及智能网关实现不同的物联网功能,用户可以利用手机或PC终端远程登录物联网服务器,监控校内电子设备、网络设备。该设计能够为智慧校园网络的升级改造提供参考,有力推进校园教育信息化建设。

基于Packet Tracer的VLAN间路由仿真实验设计

每个虚拟局域网(VLAN)在逻辑上都相当于一个独立的网络,拥有自己的广播域,VLAN之间不能直接通信,但是有时候又需要在不同网段间跨VLAN进行通信,因此研究使用Packet Tracer模拟软件实现了不同VLAN间路由的配置。

Cisco packet tracer在计算机网络实训中的应用

随着信息技术的飞速发展,计算机网络实训已成为信息技术教育中不可或缺的一环。在这一过程中,实训工具的选择至关重要,Cisco Packet Tracer提供了一个虚拟的实验环境,用户可以在其中模拟各种网络设备,如交换机、路由器和服务器等,并通过拖拽的方式构建网络拓扑结构。该软件作为一款功能强大的网络模拟软件,凭借其直观的操作界面、丰富的设备库和灵活的组网功能,在计算机网络实训中得到广泛应用。本文就Cisco packet tracer在计算机网络实训中的应用进行探讨。

基于Packet Tracer的BGP路由协议实践教学仿真

在西部地区有些高校缺乏网络实验设备,很难满足网络工程专业的高级路由技术课程中实践教学的需求,提出了一种在Packet Tracer模拟环境下实现BGP路由协议的配置,并对实践结果进行了验证。通过仿真实验,可以降低实验投资成本,是一种可行的、廉价的高效解决方案。

基于Packet Tracer软件的小型局域网络设计与仿真

小型局域网络作为一种常见的网络,其设计思路与实现过程成为网络工程课程教学中重要的实验内容。为了让学生更好地掌握网络工程的设计与实现过程,采用案例驱动方式设计了一个小型局域网络实践题目,详细阐述了如何运用Cisco Packet Tracer对网络进行设计与仿真实现。应用结果表明,此项目实践在网络工程课程教学中取得了良好效果。

基于Packet Tracer的路由综合实验设计与实现

阐述了网络层路由的基本概念、工作原理及特点,通过Packet Tracer仿真设计了静态路由、动态路由综合实验,实现了不同网络结点之间的通信,让学生能够从理论上和实践上更好地掌握网络层路由技术。

Packet Tracer软件在无线网络技术实验教学中的应用

介绍了Packet Tracer软件包含的无线网络仿真设备及其加密认证技术。借助Packet Tracer软件完成了无线网络技术课程的实验教学,由无线网卡、无线接入点和无线路由器构成无线网络,通过对无线网络的配置介绍了仿真实验过程。学生通过完成仿真实验,培养了组建、使用和管理无线网络的技能,加深了对无线网络技术理论及概念的掌握和理解。

基于Packet Tracer的“信息安全”教学实例

针对"信息安全"课程教学过程中内容枯燥、演示实验搭建复杂、演示效果不佳的状况,在分析现有实验演示工具的基础上,提出基于Packet Tracer进行信息安全实验演示,并给出了数个实例,经实际教学反馈,收到良好的教学效果。

基于Packet Tracer的帧中继实验设计与分析

帧中继实验是计算机网络课程中广域网实验的一个重要组成部分,从帧中继网络实验教学出发,以工学结合案例为引导,设计实验项目、实验拓扑、实验环境与参数数据,使用Packet Tracer仿真软件给出实验拓扑设计与配置流程,并对实验结果进行了验证与分析。

利用Packet Tracer模拟组建大型单核心网络的研究

利用模拟软件进行辅助教学能起到非常好的教学效果,阐述了利用Cisco模拟器Packet Tracer模拟组建大型单核心网络的过程。将这一在实际环境中很难实现的工程项目利用模拟软件引入到教学中,能够开拓学生的创新思维,激发学生的学习积极性。

基于Packet Tracer的NAT实验教学设计

针对当前网络实验教学的要求和特点,提出运用Packet Tracer软件提供的虚拟平台进行仿真实验教学设计,解决当前网络实验室建设中的重要问题。介绍了网络地址转换(Network Address Translation,NAT)的工作原理和分类,重点探讨基于Packet Tracer的NAT实验教学的设计过程。

基于Packet Tracer的计算机网络仿真实验教学

阐述了将Packet Tracer网络模拟器应用到计算机网络实验的教学中,进行仿真实验,可降低实验投资成本,提高学生做实验的效率,培养学生的探索精神和创造性思维。通过跨交换机实现Vlan的实例介绍了仿真实验的过程。