第37卷第5期 2016年10月
文章编号：1001-3873(2016)05-055605
新疆石油地质
XINJIANG PETROLEUM GEOLOGY DOI:10.7657/XJPG20160510
带油环凝析气藏物质平衡方程新形式
王怒涛！张武2.李璨3
Vol. 37,No.5 Oct.2016
（S0019）摘要：用物质平衡法计算气裁动态储量是目前最常用的一种方法，但是对于带油环的凝析气蔗，其动态储量不仅与产油量和产气量有关，还和反凝析程度有关。研究发现，不同类型的产出物之间存在质量转换，且转化量很难确定，
体积系数直接转换，也不能用气油比得出气与油的量，其物质平衡方程与常规气藏相比，有较大差别。根据质量守恒定理，建立了天然水驱的带油环的凝析气藏在开采条件下的物质平衡方程通式，应用多相流驱替理论及曲线插值相应的含油馋和度，通过非线性回归并最优化目标函数，得到带油环的凝析气藏动态储量。不需要采用经验公式将囊析油折算为等价气体，不需要引入两相偏差系数以及液体状态方程等概念，避免了考虑复杂相态变化引起的油、气组分
及体积变化。得出的物质平衡方程的理论基确更强，更符合凝析气蔗的实际情况。关键词：凝析气藏；油环；物质平衡方程；质量守恒；反凝析
中图分类号：TE15
文献标识码：A
ANewFormof MaterialBalanceEquationforCondensateGasReservoirswithOilRings
WANG Nutao', ZHANG Wu, LI Chen
(1.School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2.Zhundong Oil Production Plant, Xinjiang Oilfield Company, PetroChina, Fukang, Xinjiang 831511, China)
Abstract: Material balance equation is one of the most commonly-used methods to calculate dynamic reserves of gas reservoirs, but for condensate gas reservoirs with oil rings, their dynamic reserves are not only related to oil and gas production, but also to retrograde conden sation degree. Since mass conversion occurs among different products, it is difficult to accurately calculate the amount of conversions and to establish material balance equation with volume balance or molar balance. Also, conversion from wellhead oil and gas flow rate to bottom-hole inflow rate can't be realized by the direct use of the volume factor and the gas-oil ratio, hence the material balance equation for con ventional gas reservoirs greatly differs from that for condensate gas reservoirs with oil rings. On the basis of the law of mass conservation this paper proposes a general formula of the material balance equation for natural water-drive condensate gas reservoirs with oil rings under production conditions, in which multi-phase flow displacement theory and oil saturations corresponding to curve interpolation are used to get the dynamic reserves of such reservoirs with oil rings by optimizing the objective function through non-linear regression, without con-verting condensate oil into equivalent gas with empirical formula and without by means of concepts of two-phase deviation factor and state equation of liquid. Therefore, the new formula can avoid the variations in oil and gas components and their volumes resulted from complicat ed phase changes, The obtained material balance equation has a stronger theoretical foundation and can better reflect the actual status of condensate gas reservoirs.
Keywords: condensate gas reservoir; oil ring; material balance equation; mass conservation; retrograde condensation
凝析气藏作为一种特殊的复杂气藏，在开采过程中，凝析油气体系在地层中的渗流状态随着复杂的相态变化而变化，使得其物质平衡方程不同于常规气藏物质平衡方程。很多学者对凝析气藏的物质平衡方程进行了研究"-5]。文献[6]推导了不同驱动力作用下的气藏物质平衡方程，并将方程用于凝析气藏，只是在凝析气藏中将凝析油折算为等价气量，将干气量与凝析油气当量之和作为总累计产量，且
收稿日期：2016-03-02
修订日期：2016-07-07
基金项目：国家科技重大专项（2011ZX05030-005-06)
气体偏差系数为流体总偏差系数；文献[7]利用摩尔量平衡原理，建立了凝析气藏物质平衡方程，但是没有描述累计并流体中油、气的转换：文献8采用摩尔量平衡原理建立了带油环的凝析气藏物质平衡通式，同样没有论述累计井流体中的油、气的转换方式，也未定义井流体偏差因子；文献[9]依据烃孔隙体积平衡的基本原理，考虑凝析气藏储集层流体组分及相态变化特征，并引入凝析油体积系数和生产
作者简介：王怒涛(1968-)，男，四川岳池人，副教授，油气藏工程和油气井试井技术，(Tel)13980431010(E-mail)wnt_3993@163.com 万方数据