基于Pearson相关系数的集输管道流动腐蚀主控因素分析

油气田集输管道腐蚀穿孔直接影响油田的安全、环境和生产,明确管道腐蚀的主控因素至关重要。采用多相流瞬态模拟软件OLGA建立管道的里程-高程模型,模拟管道内部流动状态,如温度、压力、持液率、壁面剪切力、气液相流速等参数,利用Pearson相关系数确定影响腐蚀的主控因素,结果表明:随着里程的增加,温度、压力和持液率呈现降低的趋势与腐蚀速率的规律一致,气液壁面剪切力和气液流速随着里程的增加呈现逐渐升高的趋势,但整体规律与腐蚀速度规律一致;影响集输管道腐蚀的主要因素是持液率(0.626),其次是气体流速(0.591),为油气集输管道“一管一策”的针对性实施提供了依据。

双锥旋流分离器内固-液分离过程的数值模拟

为了进一步认识双锥旋流分离器的固-液分离过程．利用基于计算流体动力学的多相流模型对直径100mm双锥旋流分离器内粒径为5~50μm的颗粒的分离过程进行数值模拟．比较模拟所得颗粒的分离效率与实验结果的一致性。结果表明：粒径为5μm的颗粒进入内旋流后紧靠空气芯快速上升；粒径为25μm的颗粒进入内旋流后上升速度较慢，且在上升过程中逐渐远离空气芯；粒径为50μm的颗粒偶有进入内旋流的现象，但最终仍从底流排出；颗粒在分离器内的分布规律是．颗粒越小越趋向于分布于整个分离器内，随着粒径的增大，颗粒的分布先后出现浓度偏移及空间偏移，颗粒越大越趋向于分布于壁面附近及锥底部分。

微流量控压钻井水力模型研究

微流量控压钻井是一种以环空流量为监测和控制对象的控压钻井技术,它能够及时发现和控制井下微小的溢流或漏失,减少井下事故的发生。多相流环空压力的计算是微流量控压钻井的关键技术,它关系到整个控压钻井的精确性,文章建立了一种多相流环空压力计算方法和模型,为水力软件的编制和微流量钻井系统的开发设计提供了理论依据。

井筒与油藏耦合数值模拟技术现状与发展趋势

从井流量方程、井筒内热多相管流计算、多段井模型和近井区域加密的扩展井模型等4个方面总结了井筒与油藏耦合数值模拟技术的研究进展,指出目前存在的主要问题包括:复杂结构井流量方程中参数取值误差很大,不能提供准确的源汇项;高含水阶段井筒内多相管流非常复杂,常用的计算流体力学模型误差很大;非等温井筒内流固耦合模拟机理认识不清楚,数值计算时间长;模拟多层合采时未考虑纵向非均质性,薄差油层的动用情况与实际不符。提出了基于多相管流计算的多段井模型与油藏耦合的数值模拟技术、扩展井模型与油藏耦合的数值模拟技术、考虑井筒出砂和结蜡等复杂现象的流固耦合数值模拟技术是未来的发展趋势。

Experimental verification of mathematical model for multiphase flow in air-agitated seed precipitation tank

In order to check the validity of the mathematical model for analyzing the flow field in the air-agitated seed precipitation tank,a scaled down experimental apparatus was designed and the colored tracer and KCl tracer were added in the apparatus to follow the real flow line.Virtue tracers were considered in the mathematical model and the algorithm of tracers was built.The comparison of the results between the experiment and numerical calculation shows that the time of the tracer flows out of stirring tube are 40 s in the experiment and 42 s in numerical calculated result.The transient diffusion process and the solution residence time of the numerical calculation are in good agreement with the experimental results,which indicates that the mathematical model is reliable and can be used to predict the flow field of the air-agitated seed precipitation tank.

Phase-field simulation of forced flow effect on random preferred growth direction of multiple grains

The random distribution problem of dendrite preferred growth direction was settled by random grid method.This method was used to study the influence of forced laminar flow effect on multiple grains during solidification.Taking high pure succinonitrile （SCN） undercooled melt as an example,the forced laminar flow effect on multiple grains was studied by phase-field model of single grain which coupled with flow equations at non-isothermal condition.The simulation results show that the random grid method can reasonably settle the problem of random distribution and is more effective.When the solid fraction is relatively low,melt particles flow around the downstream side of dendrite,and the flow velocity between two dendrite arms becomes high.At the stage of solidification time less than 1800Δt,every dendrite grows freely;the upstream dendrites are stronger than the downstream ones.The higher the melt flow rate,the higher the solid fraction.However,when the solid fraction is relatively high,the dendrite arm intertwins and only a little residual melt which is not encapsulated can flow;the solid fraction will gradually tend to equal to solid fraction of melt without flow.

γ-CT Technique Used for Industrial Multiphase Flow Detection

A gamma-ray Computed Tomography （CT）technique based on MATLAB has been developed,and its potential for the application of multiphase flow detection has been demonstrated with simulation results.Aiming to improve the real time performance,we design a CT system with fixed sources and limited detecors.By dissecting the imaging region with Delaunay triangulation method,the algebraic reconstruction algorithm and simultaneous multiplicative algebraic reconstruction algorithm re implemented respective algebraic reconstruction algorithm are implemented respectively to reconstruct cross-sectional images.The resultant images can be utilized to identify flow regimes or extract characteristic parameters.

Computer Simulations and Measurements of RadialSolid Flow Distribution in a Riser

Comparisons between the numerical predictions from a two-phase model and the experimental hydrodynamic data have been performed in fully developed gas-solid flows for FCC catalysts. The resultssuggested the existence of self-similar solid flux profiles at low solid fluxes. Non-uniformity in theradial solids fluxes was found with a high solid flowing mainly downward near the wall. The modelpredictions were reasonably caught up the experimental trends.

Transverse flowmetry of carbon particles based on photoacoustic Doppler standard deviation using an auto-correlation method

In order to measure the flow velocity of carbon particle suspension perpendicular to the receiving axis of ultrasound transducer, the standard deviation of photoacoustic Doppler frequency spectrum is used to estimate the bandwidth broadening, and the spectrum standard deviation is calculated by an auto-correlation method. A 532 nm pulsed laser with the repetition rate of 20 Hz is used as a pumping source to generate photoacoustic signal. The photoacoustic signals are detected using a focused PZT ultrasound transducer with the central frequency of 10 MHz. The suspension of carbon particles is driven by a syringe pump. The complex photoacoustic signal is calculated by Hilbert transformation from time domain signal before auto-correlation. The standard deviation of the Doppler bandwidth broadening is calculated by averaging the auto-correlation results of several individual A scans. The feasibility of the proposed method is demonstrated by measuring the spectrum standard deviation of the transversal carbon particle flow from 5.0 mm/s to 8.4 mrn/s. The experimental results show that the auto-correlation result is approximately linearly distributed within the measuring range.