低速非达西渗流油藏产能分析
Analysis on Low Permeability Reservoir Productivity Based on Low Speed Non-Darcy Seepage Model
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- 引用格式:
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姜瑞忠,杨仁锋,徐建春,李林凯.低速非达西渗流油藏产能分析[J].天然气与石油,2012,30(6):0.doi:
.Analysis on Low Permeability Reservoir Productivity Based on Low Speed Non-Darcy Seepage Model[J].Natural Gas and Oil,2012,30(6):0.doi:
- DOI:
- 作者:
- 姜瑞忠1 杨仁锋2 徐建春1 李林凯3
- 作者单位:
- 1.中国石油大学（华东），2.中海油研究总院，3.威德福（中国）能源服务有限公司
- 关键词:
- 低渗透油藏；非达西渗流；应力敏感；产能模型
Low permeability reservoir； Non-Darcy seepage； Stress sensitivity； Capacity model
- 摘要:
- 低渗透油藏具有启动压力梯度、非达西渗流和应力敏感性等特点，其产能与常规中高渗储层有较大差异。根据低渗透油藏的特点，建立了考虑非达西渗流、启动压力梯度和应力敏感性的渗流数学模型，得到了低渗透油藏的产能公式，并对各影响因素进行分析。结果表明，低渗透油藏与传统达西渗流和拟启动压力模型渗流有明显区别，相同压差下，达西模型产能最高，非达西渗流模型次之，拟启动压力模型最低；应力敏感性是油井产能的不利因素，压差越大，影响越大。因此，在实际低渗透油藏开发产能评价中应考虑非达西渗流特征和储层的应力敏感性。
Capacity modelLow permeability reservoirs have such characteristics as start-up pressure gradient， non-Darcy seepage and stress sensitivity and their production capacity is quite different from that of conventional medium and high permeability reservoirs. Established is a mathematical model considering non-Darcy seepage， start-up pressure gradient and stress sensitivity according to the characteristics of low permeability reservoirs， obtained is a formula for calculating production capacity of low permeability reservoirs and analyzed are effects of different factors. Analysis results show that the production capacity of low permeability reservoirs is obvious different from that of traditional Darcy seepage and start-up seepage pressure model. In same pressure difference condition， Darcy model has high capacity， non-Darcy seepage model has low capacity and quasi start-up pressure model has lower capacity. Stress sensitivity is a negative factor and the greater the pressure difference， the greater the effect. Therefore， non-Darcy seepage characteristics and reservoir stress sensitivity shall be considered in actual assessment on production capacity of low permeability reservoir development.
