Production analysis and optimal design of explosive fracturing technology for low permeability reservoir
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摘要: 基于爆炸压裂裂缝分布规律，提出爆炸压裂缝网双重介质复合流动产能模型，应用Laplace变换Stehfest数值反演，得到了定压条件下封闭外边界低渗透油藏爆炸压裂生产井产能表达式。在模型正确性验证的基础上结合某低渗透油藏储层特征参数研究了爆炸压裂改造区域参数对封闭边界油藏产量的影响，同时对爆炸压裂改造改造体积优化设计进行了研究。研究结果表明，爆炸压裂改造区域半径主要影响生产中期产能，改造区域渗透率对生产早期和中期影响比较大，且对于实例油藏爆炸压裂改造比为0.1时效果最好。Abstract: The explosive fracturing technique is often adopted to produce and expand fractures due to its great shock waves, thus improving the low permeability of oil reservoirs. Based on the distribution characteristics of the explosive fracturing network and applying the Laplace transform and the Stehfest numerical inversion, this paper presents a new analytic mathematical production model for the complex-flow to an explosive fracturing well and obtains the formulas for the oil output under the constant pressure in different boundary conditions. On the basis of the model validation, this paper investigates the influence of the fracture network parameters on the output and the optimal design of the explosive fracturing. It is shown that the permeability of the fracture network exerts a great influence on the production. In addition, this paper offers an optimal design for explosive fracturing. The results from this study are expected to be significantly helpful for the optimal design of explosive fracturing and provide a rational design about the explosive quantity in low permeable reservoirs.
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图 2 储层压裂改造前后生产井产量对比
Figure 2. Comparison of production before and after reservoir stimulation
图 3 不同改造区域半径下油井日产量对比
Figure 3. Comparison of daily production between different reservoir stimulation region radii
图 4 不同裂缝渗透率下油井日产量对比
Figure 4. Comparison of daily production between different fracture permeabilities
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