低渗透油藏分段压裂水平井流入动态曲线研究

Study on Inflow Performance Curve of Staged Fracturing Horizontal Well in Low Permeability Reservoir

随着低渗透油田的不断发展,对油井流入动态提出了更高的需求,用于油井流入性能和生产率预测。基于低渗透储层的渗流特性,考虑到启动压力的存在,为垂直井建立单相,气液两相和三相流入动态方程,简单地分析了流入动态方程水平孔,具有溶解气体驱动油和气体两相流。然而,对于具有启动压力梯度的低渗透储层,动态预测非常重要。在本文中,给出了流入动力学预测的关系,通过使用流体生产指数作为来源的三相流量的流入动力学之间的关系。同时,考虑到启动压力梯度是影响低渗透储层的重要因素,提出了一种计算启动压力的简单方法,通过从速度敏感测试获得的基本数据来计算,以及潜力叠加原理用于推导储层生产预测公式,适用于低渗透油藏。最后,使用ANSAI油田的低渗透性的例子来进一步验证流入动态关系的准确性。然后更有效地提高低渗透油藏的生产水平和生产效果。

With the continuous development of low permeability oilfields,there is a higher demand for oil well inflow performance,which can be used to predict oil well inflow performance and productivity.Based on the percolation characteristics of low permeability reservoir,considering the existence of starting pressure,the single-phase,gas-liquid two-phase and three-phase inflow dynamic equations are established for vertical wells.And the horizontal hole of inflow dynamic equations is simply analyzed,which has dissolved gas driving oil and gas two-phase flow.However,dynamic prediction is very important for low permeability reservoirs with starting pressure gradient.In this paper,the relationship of inflow dynamics prediction is given,and the relationship between inflow dynamics of three-phase flow using fluid production index as the source is given.At the same time,considering that the starting pressure gradient is an important factor affecting low permeability reservoirs,a simple method for calculating the starting pressure is proposed,which is calculated by the basic data obtained from velocity sensitive test,and the potential superposition principle is used to derive the reservoir production prediction formula,which is suitable for low permeability reservoirs.Finally,the low permeability example of ANSAI Oilfield is used to further verify the accuracy of inflow dynamic relationship.And then the production level and effect of low permeability reservoirs can be improved more effectively.