深圳大学学报理工版

为研究致密油储层改造参数对压裂水平井非稳态流动特征的影响,有效预测压裂水平井产能,基于复杂缝网特征,建立了缝网双重介质压裂水平井渗流数学模型,采用有限元法对模型进行数值求解.结合长庆油田Z183井区致密油资料,通过对比不同改造方式及不同储层改造体积模式的模型计算结果,分析压裂水平井非稳态产量特征,并采用信息量分析法对压裂水平井产能影响因素进行研究.研究发现,储层改造带宽与初期线性流动阶段持续时间和压裂水平井产能正相关,与产量下降时间负相关; 各主要因素按影响的显著程度从小到大依次为:主裂缝半长、水平井段长度、主裂缝导流能力和裂缝条数; 次要影响因素包括基质渗透率、孔隙度和裂缝簇数等.

To account for the influence of reservoir stimulation on characteristics of unsteady-state flow and forecast the production capacity of horizontal well in tight oil reservoir, a dual-porosity model for stimulating the fracture network flow is established and the finite-element method is introduced to achieve numerical solutions. Field data of Z183 is used to study the characteristics of unsteady-state production and the corresponding impact factors of fractured well transient performance by using information analysis method. The results show that the increase of fracture network width helps decrease the decline rate of production at early time and increase well production in the life time. The main factors in descending order according to the significance are as follows: the half-length of hydraulic fracture, the length of horizontal wellbore, the conductivity of hydraulic fracture and fracture stage, all of which are the primary influencing factors. Matrix permeability, porosity and fracture cluster are the secondary influencing factors.

引言
1 缝网双重介质压裂水平井物理模型
2 缝网双重介质压裂水平井数学模型
3 压裂水平井非稳态产量特征分析
4 非稳态产量影响因素分析
5 结语

$图1 双重介质压裂水平井物理模型<br/>Fig.1 Physical model of fractured horizontal well in dual-porosity reservoir$

图1 双重介质压裂水平井物理模型
Fig.1 Physical model of fractured horizontal well in dual-porosity reservoir

$图2 压裂水平井网格剖分<br/>Fig.2 The grid of fractured horizontal well$

图2 压裂水平井网格剖分
Fig.2 The grid of fractured horizontal well

图3 Bakken致密油压裂水平井非稳态产量动态特征 <br/>Fig.3 Unsteady-state production feature in Bakken tight oil reservoir

图3 Bakken致密油压裂水平井非稳态产量动态特征
Fig.3 Unsteady-state production feature in Bakken tight oil reservoir

图4 长庆致密油CQ-HP井非稳态产量动态特征<br/>Fig.4 Unsteady-state production feature in Changqing tight oil reservoir

图4 长庆致密油CQ-HP井非稳态产量动态特征
Fig.4 Unsteady-state production feature in Changqing tight oil reservoir

图5 储层部分改造地层压力动态变化规律<br/>Fig.5 Dynamic formation pressure distribution of partial SRV stimulation

图5 储层部分改造地层压力动态变化规律
Fig.5 Dynamic formation pressure distribution of partial SRV stimulation

图6 不同储层改造方式非稳态产量动态特征<br/>Fig.6 Unsteady-state production for different modification modes

图6 不同储层改造方式非稳态产量动态特征
Fig.6 Unsteady-state production for different modification modes

图7 Bakken两口致密油生产井非稳态产量对比 <br/>Fig.7 Comparison of two product wells in Bakken oil field

图7 Bakken两口致密油生产井非稳态产量对比
Fig.7 Comparison of two product wells in Bakken oil field

图8 不同储层改造带宽非稳态产量动态特征<br/>Fig.8 Unsteady-state production for different fair-width

图8 不同储层改造带宽非稳态产量动态特征
Fig.8 Unsteady-state production for different fair-width

$图9 不同储层改造体积模式与非稳态产量动态特征<br/>Fig.9 Unsteady-state production at different angle between horizontal well hydraulic fracture$

图9 不同储层改造体积模式与非稳态产量动态特征
Fig.9 Unsteady-state production at different angle between horizontal well hydraulic fracture

表1 Z183区压裂水平井参数及累积产量统计结果<br/>Table 1 Well parameters and accumulative production statistics in Z183 area

表1 Z183区压裂水平井参数及累积产量统计结果
Table 1 Well parameters and accumulative production statistics in Z183 area

$表2 主裂缝半长信息量计算表<br/>Table 2 Result of information content analysis of the fracture with different half-lengths$

表2 主裂缝半长信息量计算表
Table 2 Result of information content analysis of the fracture with different half-lengths

图10 各因素信息量<br/>Fig.10 Information content of different factors

图10 各因素信息量
Fig.10 Information content of different factors

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引言

1 缝网双重介质压裂水平井物理模型

2 缝网双重介质压裂水平井数学模型

3 压裂水平井非稳态产量特征分析

4 非稳态产量影响因素分析

5 结语

期刊信息

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