﻿ 利用生产数据计算气井控制储量和水侵量

1. 油气藏地质及开发工程国家重点实验室(西南石油大学), 四川成都 610500;
2. 中国石油新疆油田分公司, 新疆克拉玛依 834000

A Method to Calculate Gas Well Controlled Reserves and Water Influx from Production Data
Liu Qiguo1, Liu Zhenping1, 2, Wang Hongyu1, 2, Chen Xing1, Cai Rushuai1, Qin Ke1
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University), Chengdu, Sichuan, 610500, China;
2. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang, 834000, China
Abstract:To avoid complex water influx calculations, a new formula was derived to calculate gas well controlled reserves and water influx based on water storage volume coefficient which was expressed by the gap between current water saturation and initial water saturation of the gas reservoir.Using the new formula, the controlled reserves and water influx of three wells in a water driven gas reservoir were calculated.The results showed that this method provided a precision equivalent to other methods.Moreover, the formula was used to calculate water saturation, single well controlled reserves and water influx of a well in such reservoir at different times, which indicated recovery degree, water saturation of gas reservoir increased and gas well controlled reserves and water influx increased over the well production time.The well controlled reserves had a linear relation to formation pressure difference or water saturation, while water influx had a linear relation to the formation pressure difference and an exponential relation to the water saturation.This method requires steady production data to calculate the water saturation, so it is only suitable for the gas wells that have been produced for some time.
Key words: water driven gas reservoir    single well controlled reserves    material balance equation    water storage volume coefficient    water influx

1 当前气藏含水饱和度的确定

2 气藏水侵量和动态储量的确定

3 实例计算

 图 1 气水的相对渗透率曲线 Fig. 1 Gas-water relative permeability curves

 井号 单井控制储量/108m3 水侵量/104m3 流动物质平衡法 动态拟合法 文中方法 胡俊坤法 文中方法 1 6.73 6.94 6.86 74.46 75.07 2 2.75 3.13 2.94 35.22 37.69 3 9.05 8.27 8.49 92.09 87.63

 测试时间 p/MPa Bg Rwgp /(m3·10－4m－3) Gp/108m3 Wp /m3 Sw G/108m3 We /104m3 2010-01-30 41.32 0.003 8 0 2010-06-27 40.37 0.003 8 0.108 0.230 1 254 2011-07-17 37.44 0.004 0 0.174 0.977 9 1 151 0.386 6 6.37 23.64 2012-06-25 35.83 0.004 2 0.708 1.617 1 3 645 0.466 0 6.39 43.21 2013-06-26 34.22 0.004 3 2.683 2.299 7 14 914 0.557 1 6.42 66.70 2014-01-23 33.47 0.004 4 2.749 2.649 1 23 447 0.568 7 6.86 75.07

 图 2 单井控制储量和水侵量与地层压力差Δp的关系曲线 Fig. 2 Single well controlled reserves vs.water influx or formation pressure difference Δp
 图 3 单井控制储量和水侵量与气藏含水饱和度Sw的关系曲线 Fig. 3 Single well controlled reserves vs.water influx or water saturation Sw of gas reservoir
4 结 论

1) 笔者提出的方法，不用考虑水体的形态和大小，仅利用生产数据和相对渗透率数据就可以求得气藏的动态储量和水侵量，实用性强，但由于求取气藏含水饱和度时要用稳定生产数据，因此该方法仅适应于生产时间较长(一般不少于半年)的气井。

2) 利用同一口气井不同时刻的数据，计算出不 同时刻的单井控制储量和水侵量，有利于跟踪和分析气井控制范围的变化。

3) 煤层气藏、页岩气藏中由于存在解吸过程，利用生产数据计算气井控制储量存在较大误差，需进一步根据其特殊的渗流机理提出新的计算方法。

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#### 文章信息

Liu Qiguo, Liu Zhenping, Wang Hongyu, Chen Xing, Cai Rushuai, Qin Ke

A Method to Calculate Gas Well Controlled Reserves and Water Influx from Production Data

Petroleum Drilling Techniques, 2015, 43(01): 96-99.
http://dx.doi.org/10.11911/syztjs.201501016