低渗透裂缝型碳酸盐岩酸压气井动态特征分析
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TE355

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十三五国家科技重大专项(2017ZX05009-003)


Dynamic Characteristic Analysis for Acid Fracturing Gas Well of Low Permeability Fractured Carbonate Reservoir
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Major national science and technology projects in the 13th five year plan(2017ZX05009-003)

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    摘要:

    低渗透裂缝型碳酸盐岩基质低孔低渗、天然裂缝发育,为了分析低渗透裂缝型碳酸盐岩气藏酸压后渗流特征和产量递减规律,建立了考虑低速非达西流动、应力敏感的动态特征分析模型。利用对数变换和摄动法得到不稳定产量和压力解,基于典型曲线特征分析了四类因素对产量递减的影响。结果表明:低渗透裂缝型碳酸盐岩酸压气井存在8个流动阶段;低速非达西在生产中后期影响明显,会削弱窜流对产量递减的补偿作用,明显降低气井产能;应力敏感在生产后期影响凸显,对气井递减率和产能影响较小;改造程度越高,产量递减率越大,产能下降越明显;改造范围越大,气井稳产能力越强。因此,实际低渗透裂缝型碳酸盐岩气藏产能分析中不可忽略低速非达西渗流和对应力敏感产能的影响;为了保持气井的稳产能力,酸压改造应以增大改造范围为主。

    Abstract:

    In order to analyzed the transient production performance and transient pressure behavior of acid fracturing gas well of low permeability fractured carbonate reservoirs, the dynamic characteristic analysis model, considering acid fracturing degree and area, stress sensitivity, low-velocity Non-Darcy flow, was established. Logarithmic transformation and perturbation method are used to obtain the rate and pressure transient solution. The research results show that: First, there are eight flow stages in low permeability fractured carbonate acid fracturing gas well, inter-porosity flow can offset production decline. Second, low-velocity non-Darcy flow is obviously affected in middle and late stage, which will weaken the compensation effect of inter-porosity flow and reduce gas well productivity. Stress sensitivity is prominent in late stage, which has little effect on gas productivity and decline rate. Third, the higher the acid fracturing degree, the faster the decline rate, the more obvious the decrease of production performance. The bigger the area of acid fracturing reconstruction the stronger the stable production capacity. It is concluded that low-velocity Non-Darcy flow and stress sensitivity should be considered in low permeability fractured carbonate gas reservoir, and acid fracturing should be based on increasing the scope of construction in order to maintain the stable production capacity.

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史文洋,程时清,姚约东,等. 低渗透裂缝型碳酸盐岩酸压气井动态特征分析[J]. 科学技术与工程, 2020, 20(22): 8948-8956.
Shi Wen-yang, Yao Yue-dong, Feng Nai-chao, et al. Dynamic Characteristic Analysis for Acid Fracturing Gas Well of Low Permeability Fractured Carbonate Reservoir[J]. Science Technology and Engineering,2020,20(22):8948-8956.

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  • 收稿日期:2019-10-20
  • 最后修改日期:2020-02-24
  • 录用日期:2020-03-12
  • 在线发布日期: 2020-08-25
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