ISSN 1673-8217 CN 41-1388/TE
主管:中国石油化工集团有限公司 主办:中国石油化工股份有限公司河南油田分公司
孙恩慧, 侯亚伟, 张东, 汪巍, 彭琴. 2020: 低渗透油藏油气两相下水平井产能预测及影响因素分析——以渤海油田A油藏为例. 石油地质与工程, 34(01): 74-78.
引用本文: 孙恩慧, 侯亚伟, 张东, 汪巍, 彭琴. 2020: 低渗透油藏油气两相下水平井产能预测及影响因素分析——以渤海油田A油藏为例. 石油地质与工程, 34(01): 74-78.
SUN Enhui, HOU Yawei, ZHANG Dong, WANG Wei, PENG Qin. 2020: Productivity prediction of horizontal well under oil and gas two-phase in low permeability reservoirs and influencing factors analysis——by taking Bohai A oilfield as an example. Petroleum Geology and Engineering, 34(01): 74-78.
Citation: SUN Enhui, HOU Yawei, ZHANG Dong, WANG Wei, PENG Qin. 2020: Productivity prediction of horizontal well under oil and gas two-phase in low permeability reservoirs and influencing factors analysis——by taking Bohai A oilfield as an example. Petroleum Geology and Engineering, 34(01): 74-78.

低渗透油藏油气两相下水平井产能预测及影响因素分析——以渤海油田A油藏为例

Productivity prediction of horizontal well under oil and gas two-phase in low permeability reservoirs and influencing factors analysis——by taking Bohai A oilfield as an example

  • 摘要: 水平井开发已广泛应用在低渗透油藏中,若井底流压小于饱和压力时,预测水平井产能应考虑油气两相渗流的影响。基于考虑启动压力梯度和应力敏感的运动方程,运用保角变换和等值渗流阻力原理,建立了低渗透油藏油气两相下水平井产能预测新公式,并开展了影响水平井产能敏感性因素分析。研究表明,启动压力梯度对水平井产能影响呈线性关系,在相同水平段下,启动压力梯度增大,水平井产量减少,在不同水平段下,水平段长度越小,启动压力梯度对产能影响越大;应力敏感系数增大,水平井产量下降,当应力敏感系数小于0.06 MPa~(–1)时,应力敏感对水平井产能的影响较小。

     

    Abstract: Horizontal well development has been widely used in low permeability reservoirs. If bottom-hole flow pressure is less than saturation pressure, the influence of two-phase flow should be considered when predicting the productivity. Based on the motion equation, a new formula for predicting the productivity in low permeability reservoirs is established, and the factors affecting the productivity sensitivity are analyzed. The example shows the prediction formula established has less relative error and higher accuracy. The results show the effect of starting pressure gradient on productivity is linearly decreasing. At the same horizontal section, the start-up pressure gradient increases and the production decreases. At different horizontal sections, the smaller the length of the horizontal section, the greater the impact of starting pressure gradient on productivity. When the stress sensitivity coefficient increases, the production decreases. When the stress sensitivity coefficient is less than 0.06 MPa~(-1), the impact of stress sensitivity on horizontal well productivity is smaller.

     

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