统一粘度模型预测天然气粘度

本文采用基于对应态原理的统一粘度模型对天然气气相和液相的粘度进行了预测。模型通过引入混合规则,仅需天然气各组分的基本物性数据即可预测混合物粘度,计算简便可行。应用于二元轻烃混合物７４９个数据点及天然气高压粘度的预测,平均绝对差分别为４．１３％和２．１３％,优于现有的其它粘度模型。     

��Ȼ��ճ�ȵļ򵥼��㷨

实验测定天然气粘度的精确度十分困难,大多利用图版查取,而查图容易造成人为误差。本文介绍这套天然气粘度的计算公式是根据现场资料拟合所得到的,经实例计算结果表明:计算值与实测值相当吻合。计算公式 1.标准压力下压力为0.1Mpa时,天然气粘度(μ_3)_(T.0.1)与温度和非烃类气体的摩尔分数有关,可用下式计算: (μ_3)_(T.0.1)=[(μ_3)_(T.0.1)]_H+[(μ)_(T.0.1)]_(NH) (1)     

计算油、气、水物理性质参数的新公式

本文介绍了计算油、气、水物理性质参数(如地面脱气原油粘度、饱和原油粘度、不饱和原油粘度、溶解油气比和原油体积系数等)的较新公式,并给出了计算水的粘度、原油-天然气和水-天然气的表面张力公式,可供油田开发、采油工艺和油气集输工作者使用.     

普光气田高含硫天然气粘度计算模型优选与评价

通过试验可以测定高含硫天然气的粘度,但费用高,危险性大.以室内试验数据和Elsharkawy提供的测试数据为基础,采用未校正的Dempsey模型、Lee模型、LBC模型、DS模型、Londono模型,以及YJS校正法、Standing校正法和Elsharkawy校正法,计算了普光气田高含硫天然气的粘度,并与试验测试值进...     

基于PR状态方程的粘度模型

基于p-v-T和T-μ-p图形的相似性。结合两参数Peng-Robison状态方程,建立了一个能够同时预测流体气、液相粘度的统一模型。该模型的特点是能够同时描述气、液相及超临界流体的粘度随温度、压力和组成的变化,并能够连续通过临界点。在宽广的温度、压力范围内,对22种烷烃及二氧化碳、氮气共计4250个数据点的粘度进行了计算,绝对平均误差为7.01%;通过引入vanderWals单流体混合规则,将PR粘度模型应用于明确烃类混合物及油气藏流体粘度的计算。三个二元烃类混合物2441个数据点的绝对平均误差为15.71%;9种天然气及22种油藏原油粘度计算值的绝对平均误差分别为9.8%和13.99%,计算结果优于现有的油气藏流体粘度模型。     

从50和100℃运动粘度计算石油产品粘度指数的方法

本文是根据我国石油产品粘度分级的特点,按粘度指数定义,在验证了 Walther 方程式的基础上,用统计法确定方程式中的经验常数 a,导出了从50和100℃运动粘度计算石油产品粘度指数的方法.在此基础上编制了《粘度指数换算表》,绘制了粘度指数计算图。大量的验证数据证明,本方法的计算结果与 ASTM_(D2270-64)方法的结果平均偏差两个单位,个别的相差接近7个单位。本方法具有计算简单的优点,适用于石油产品特别是润滑油粘度指数的计算。     

中华人民共和国国家标准天然气发热量、密度和相对密度的计算方法

本标准参照采用国际标准ISO 6976-1983(E)《天然气发热量、密度和相对密度的计算》. 1 主题内容与适用范围本标准规定了当已知天然气的摩尔组成时,用各纯组分的物性值计算天然气的发热量[包括高(位)发热量和低(位)发热量]、密度和相对密度的方法. 本标准也描述了由分析方法精密度确定计算发热量的精密度的方法.     

高凝高粘原油井筒粘度计算模型

大港油田高凝高粘原油在不同含水、不同温度下的粘度测试结果表明,在不同含水条件下,随温度的升高,高凝高粘原油的粘度都有不同程度的降低,表现出了很明显的粘温特性;在同一温度下,原油的粘度随着含水率的变化是一个先增加后减小的过程,峰值含水区间为20%～40%;对实测原油粘度数据进行回归得到粘度计算经验模型。根据幂律流体流动规律分别建立了有杆抽油井上冲程和下冲程过程中井筒和杆管环形管道内流体流动的速度场模型和相对应的流体粘度计算模型。计算结果显示,所建立的井筒粘度计算模型与实测结果误差较小,大大优于常规油井井筒粘度计算模型,能够满足工程需要。     

��Ȼ�������½�����ģ��

基于能量守恒原理和范德华混合规则，导出了天然气节流温降的数学模型，该模型采用Peng-Robinson方程描述天然气节流的相平衡过程。应用Brown烙墒图版数据进行实例计算，并将本模型计算结果与查焓熵图的值进行了对比分析。在天然气相对密度0．6-1．0、压力0．0344—68．95MPa和温度93．3—371．1℃的条件下，两种不同方法得到的计算结果十分吻合，其平均误差仅为—0．21％，平均绝对误差为0．55％，由此证明本模型的正确性且具有较宽的适用范围。应用本模型的计算机程序较查焓墒图版方法具有快捷、简便和适应性好等优点，为工程上进行采输工艺设计和生产动态分析(如天然气水合物的预测和防止等)提供了重要手段。     

高凝高粘原油井简粘度计算模型

大港油田高凝高粘原油在不同含水、不同温度下的粘度测试结果表明，在不同含水条件下，随温度的升高，高凝高粘原油的粘度都有不同程度的降低，表现出了很明显的粘温特性；在同一温度下，原油的粘度随着含水率的变化是一个先增加后减小的过程，峰值含水区间为20％～40％；对实测原油粘度数据进行回归得到粘度计算经验模型。根据幂律流体流动规律分别建立了有杆抽油井上冲程和下冲程过程中井筒和杆管环形管道内流体流动的速度场模型和相对应的流体粘度计算模型。计算结果显示，所建立的井筒粘度计算模型与实测结果误差较小，大大优于常规油井井筒粘度计算模型，能够满足工程需要。     

��ѹ����KQ��A����ˮ��̾�ʵ���о�

��This paper presents a new cementing method with KQ��A aerated cement which provides a new way to solve the problem of gas leakage caused by "weightlessness" of cement slurry. Through cementing practice in sever gas wells of South Sichuan Petroleum Mine, Sichuan Petroleum Administration (i.e. Sha��9, O��1, Bao��61, Ba��14, Tonglan��5, Lu��14, Long��40��1 etc.), it isproved that this method can prevent gas leakage at the well head or fluid inter. connection among zones in the gas wells with high pressure and multizone reservoirs respectively, and the cementing quality has been obviously improved.     

�������ˮ���ض�̬Ԥ��ģ��

��In order to advance the rational development of a gas field, we introduce a method using a microcomputer Z-80 to predict the constant production rate stage of a depletion gas reservoir, to determine the decline stage under constant wellhead pressure, and to choose para-meters. Finally an example is calculated by using this method.     

����Ͷ�����̼��������ڼ׻����Ҵ���ˮ��Һ�е��ܽ��

��The equilibrium solubility of sour gas mixture of H₂S and CO₂ in MDEA aqueous solution (2.5kmol/m³),had been determined at 40�� and 100��.The scope of partial pressure of H₂S is 0.03��149.35 kPa and that of CO₂ is 1��416.85 kPa.A solubility isoline chart of the sour gas mixture of H₂S and CO₂ is shown in this paper also.     

�ѷ�������������������

��In a closed finite circle formation with double porous media (fracture-porosity system),when the well produces at a constant flow rate the apparent steady state will be arrived just as in sandstone after the pressure has propagated to the boundary. This theory has been proved by gas well test in field. According to the apparent steady state date in pressure drawdown curve,the control reserves of a gas well can be calculated correctly. This test method is simple,the calculated result is of high accuracy and it is Convenient to be applied and popularized.     

��ѹ���ߺ�H2S��CO2��������ѹ���ļ���

��Bottom pressure calculation method of surpressure gas well and how to correct the pseudo-critical parameters of natural gas with high content of H₂S and CO₂ are presented in this paper. As an example, three gas wells in Luzhou region are given out, The calculated result is near to the production data with maxium error of 7.89 kg/cm² and minimum one of only 0.07 kg/cm².     

�ùػ��������ۺ�¼�������ж�������Ϣ

��It is stated in this work that the rule that reflected on the composite log curves while drilling,the overflow informations of different fluids in four main reservoirs belonging to ultra-high pressure formations in Guan key well come early or late,is"the volume of mud��the gas logging total hydrocarbon��the density of mud."     

ȷ�������������������ļ򵥷���

��A relative long time is spent on the multi-points steady well test in gas well capacity test. This paper proposes a simple predicting method Which just by the reservoir pressure of gas well and the bottom flow pressure and corresponding production rate at a test point can obtain a absolute open flow which is very approximate to the result calculated with the conventional multi-points steady test. This method is able to continuously predict the capacity changes of gas well at various bottom flow pressures also.     

����ѹ��ϵ��ŵģͼ����ѧģʽ��̽��

��Based on applying the katz (u. s) chart of natural gas compressibility factor to obtain compressibility factors in a gas well, this paper designs and draws a normograph with which the natural gas compressibility factors may be directly read off according to the bottom hole flowing pressure and well depth, and derives a corresponding mathematical model of compressibility factor, its reliability has been proved in design and experiment of water withdrawal in gas production technique.     

��Ȼ��ճ�ȵļ��㼰����������

��This paper proposes a set of calculation formulas of natural gas viscosity which are obtai-ned from computer fitting by use of the chart concerned.The viscosity values ealeulated by this set of calculation formulas are uniform with the values obtained from the chart. Based on this set of calculation formulas,a computer program had been worked out,which can be applied in the design calculation concerned.     

��ɫϵͳ���������￪���е�Ӧ��

��This paper utilizes the G M (1.1) model of prof. Deng Julong's grey system theory to set up a performance model of gas field development, and proposes a new simple equation for estim-sting the reserve of gas reservoir and a new method for well testing, i. e. constant step well testing, which can he used to predict the bottom pressure and temperature.