乌拉泊水库除险加固勘察及其成果分析

制定了乌拉泊水库除险加固勘察工作要点,并对库区进行了实际勘察。通过对勘察成果的详细分析,为乌拉泊水库的除险加固工程提供了重要依据,同时也为该水库的安全运行提供了科学的资料。     

State variable analysis of hydrological systems

The concepts of state and state variables are introduced. From a mathematical point of view the concept of state variables provides the means of transforming a differential equation of any order into an equivalent set of first-order equations. From a physical point of view the state of a system, specified by numeric values of the system state variables at a given time, contains all the relevant information about the system necessary to predict the behaviour of the system in the future. The state variable concept is thus very much suited for analysis of dynamic systems. Examples of the state variable concept applied to analysis of discharge from a reservoir and from two reservoirs operating in series are presented.     

黄陵地区长6、长8储层物性与电性特征分析

鄂尔多斯盆地南部黄陵地区延长组长6、长8储层主要发育残余粒间孔、溶蚀粒间孔和溶蚀粒内孔等孔隙类型,多为小-微孔—微细喉型和中孔—细-微细喉型孔隙结构。通过储层物性与电性特征分析等途径认识储层性质。研究区长6储层属于特低孔、超低渗储层,长8储层属于超低孔、超低渗储层。长6、长8储层测井解释孔隙度、渗透率结果与岩心物性实测结果差别较大。     

Determination of best possible correlation for gas compressibility factor to accurately predict the initial gas reserves in gas-hydrocarbon reservoirs

Gas compressibility factor or z-factor plays an important role in many engineering applications related to oil and gas exploration and production, such as gas production, gas metering, pipeline design, estimation of gas initially in place (GIIP), and ultimate recovery (UR) of gas from a reservoir. There are many z-factor correlations which are either derived from Equation of State or empirically based on certain observation through regression analysis. However, the results of the z-factor obtained from different correlations have high level of variance for the same gas sample under the same pressure and temperature. It is quite challenging to determine the most accurate correlation which provides accurate estimate for a range of pressures, temperatures, and gas compositions. This paper presents a novel method to accurately estimate GIIP of an Australian tight gas field through identification of the most appropriate z-factor correlations, which can accurately determine the z-factor and other PVT properties for a wide range of gas compositions, temperatures, and pressures. The sensitivity study results demonstrated that a single correlation cannot work across the range of pressures and temperatures for a certain gas sample necessary to calculate z-factor during simulation process and/or other analysis, such as material balance and volumetric estimate.     

尹回水库除险加固工程中高喷灌浆技术的探讨

灌浆施工为隐蔽性工程，文中介绍了尹回水库除险加固工程的灌浆施工过程，总结了施工中需要注意的一些关键程序，为工程的施工管理提供了参考。     

A Hybrid Symbiotic Evolution–Neuro Fuzzy Strategy for Permeability Estimation of the Reservoir

A key parameter for reservoir characterization is permeability distribution. Most well log data and core permeability values are corrupted by noise (such as uncertain depth-matching, core testing conditions, and thin beddings). In this work, the authors first used wavelet as a new powerful tool for de-noising data points and then they investigated how the integration of back propagation with group based symbiotic evolution improves the reliability and prediction capability of neuro-fuzzy systems for predicting permeability of real reservoir data.     

深层水平井双聚胺基钻井液技术研究与应用

针对大庆油田深层致密气埋藏深,储层砾岩、火山岩裂缝发育,水敏性强,钻井过程中易发生漏失、垮塌、缩径及高温钻井液性能变差等复杂,且深层水平井钻进会带来摩阻、携岩和储层污染及使用油基钻井液存在成本高、后期环保压力大等难题,在分析总结前人研究成果及经验基础上,从致密气藏地质特征及深层水平井钻井难点出发,明确了钻井液技术对策,通过开展聚胺和聚醚多元醇"双聚"抑制、封堵防塌剂的研究,配合自主研制的新型高效随钻封堵材料,研发出一套适合于深层致密气藏水平井施工的双聚胺基钻井液技术。室内研究及现场应用表明,该钻井液具有较强的封堵防塌、井眼清洁和润滑防卡能力,抗温达180℃以上,有效地解决了深层水平井漏失、垮塌、携屑、润滑问题和储层保护问题,保证了深层水平井的顺利施工,创造了大庆油田深层水平井钻井周期最短(109d),井深最深(5048 m),水平段最长(969.22 m),井底温度最高(180℃)等几项新纪录,完全满足了徐家围子地区深层致密气藏的钻探需求,为深层水平井安全、快速、高效钻井提供了技术保障。     

克拉玛依油田九_5区石炭系火山岩储层分类及开发实践

克拉玛依油田九5区石炭系油藏是准噶尔盆地克-百断裂带上盘石炭系油藏的一部分,属裂缝性火山岩油藏,为低孔低渗双重介质块状油藏。通过油藏微观研究和单井产量分析,认为石炭系储层主要表现为I类裂缝型(IF)、I类裂缝-基质型(IFM)、II类裂缝-基质型(IIFM)、II类基质型(IIM)、III类基质型(IIIM)共3大类5小类,各类型储层静态和动态特征明显。平面上,石炭系储层从火山口向外依次发育I类、II类、III类储层;剖面上,I类储层主要分布于石炭系中上部,II类储层在石炭系全层段均有分布,III类储层主要分布于石炭系下部。根据不同类型储层特点及其分布规律,制定了针对性的增产措施,并取得了较好的开发效果,预测油藏最终采收率可达16.7%。     

特高含水油藏CO_2气水交替驱注入参数优化方法

影响CO2气水交替驱开发效果的参数较多,为了得到最佳开发效果,以特高含水开发阶段的A井组为研究对象,运用数值模拟方法,对该井组CO2气水交替驱注入参数进行了优化,建立了一套CO2气水交替驱、提高采收率注入参数优化的思路和方法。结果表明:实施CO2气水交替驱能使高含水井含水率下降5~10个百分点,增加产油,并保持地层压力稳定,维持油井长时间经济有效生产。     

大牛地致密低渗气田水平井压裂穿层可行性分析

大牛地气田纵向上发育七套气层,目前成熟的水平井压裂工艺技术仅能满足单层开发,如何在不改变现有工艺技术条件下,实现两层同时动用成为一个开发难点。通过数值模拟,对水平井人工裂缝穿层影响因素进行分析,明确了地质因素穿层界限;对施工参数进行优化,确定了一套适合穿层井的最优参数。现场试验表明:水平井压裂过程中人工裂缝能够实现有效穿层,达到了提高单井产量的同时也降低开发成本的目的。