考虑多因素致密双重介质气藏产能计算新模型
A New Model for Calculating Well Productivity of Compact Double Medium Reservoir Considering Multiple Factors
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- 引用格式:
-
李芳,于超,丁海帆,王珍珍.考虑多因素致密双重介质气藏产能计算新模型[J].天然气与石油,2017,35(1):0.doi:
Li Fang, Yu Chao, Ding Haifan,Wang Zhenzhen.A New Model for Calculating Well Productivity of Compact Double Medium Reservoir Considering Multiple Factors[J].Natural Gas and Oil,2017,35(1):0.doi:
- DOI:
- 作者:
- 李 芳1 于 超1 丁海帆1 王珍珍2
Li Fang, Yu Chao, Ding Haifan,Wang Zhenzhen
- 作者单位:
- 1.中国石油新疆油田公司采油二厂油田地质研究所, 2.中国石油新疆油田公司采油一厂油田地质研究所
1.Oilfield Geological Research Institute, No.2 Oil Production Plant of Xinjiang Oilfield Company; 2.Oilfield Geological Research Institute, No.1 Oil Production Plant of Xinjiang Oilfield Company
- 关键词:
- 致密气藏;滑脱效应;启动压力梯度;产能方程
Compact gas reservoir; Slippage effect; Threshold pressure gradient; Productivity equation
- 摘要:
- 目前对于气藏滑脱效应和启动压力梯度的研究,主要集中在低压的情况下,这与气藏的实际情况不符。气藏的废弃压力一般都比较高,研究高压下的启动压力梯度和滑脱效应对致密气藏的开发非常重要。通过室内高压试验,来评价气藏开发过程中这两种效应,结果发现双重介质岩心在高压下存在滑脱效应和启动压力梯度,滑脱效应随着压力降低和渗透率的减小而变大;同时,启动压力梯度会随着气藏压力的降低而增加,孔隙度增大,启动压力梯度减小。建立同时考虑高速非达西、启动压力梯度和滑脱效应这三种效应的产能方程。计算表明,启动压力梯度对气藏的渗流起到了阻碍的作用,而滑脱效应使渗流速度变大,但是启动压力梯度的影响程度更大,考虑滑脱效应与启动压力的产能公式对孔隙-裂缝性双重介质致密气藏的开发具有一定的实用价值。
The research of slippage effect and threshold pressure gradient for gas reservoir is done under low pressure, which is not in accord with the actual situation of the gas reservoir. For the high waste pressure of gas reservoir, the study of the two effects under high pressure is quite vital for the development of compact gas reservoir. By way of indoor high pressure experiments, it can be used to evaluate their effect on development of gas reservoir. The slippage effect will be more serious with the decrease of pressure and permeability. The threshold pressure gradient will be greater when reservoir pressure decreases. But it will decrease as the increasing of porosity. In consideration of high-speed non-Darcy, slippage effect and threshold pressure gradient, the new productivity equation is established. The results show that the threshold pressure gradient will be an obstacle for the gas flow, while the slippage effect is good for the gas flow. The effect of threshold pressure gradient is greater. The new productivity equation is significant for the development of gas reservoir with porosity-crack double medium.
