高速通道压裂通道率影响因素实验研究

Research on the influencing factors of channel rate for channel fracturing

高速通道压裂是近几年在非常规致密油气资源开采中出现的新工艺。通道率是影响高速通道压裂技术的一个重要指标。运用平板裂缝模型研究压裂液黏度、纤维浓度、支撑剂浓度、排量、脉冲时间和孔密6个因素对通道率的影响,以期获得良好的通道率。通过单因素影响实验研究各参数对通道率的影响,并在此基础上,采用正交实验进行多因素组合分析各参数对通道率的影响程度。实验表明,压裂液黏度、纤维浓度以及孔密的增加会使通道率增大;脉冲时间、支撑剂浓度的增加会导致通道率的减小;排量的增加使通道率呈现出先增大后减小的趋势。在黏度大于100 mPa·s实验条件下,6个因素对通道率的影响程度大小为:支撑剂浓度>脉冲时间>纤维浓度>排量>压裂液浓度>孔密。

In the exploitation of unconventional tight oil and gas resources, channel fracturing is a new fracturing technology in re- cent years, and channel rate is a very important factor to influence channel fracturing. In order to gain good channel rate, this paper studies six influential factors of fracturing fluid viscosity, fiber concentration, proppant concentration, discharge rate, pulse time and shooting density by using plate fracture model. In addition, the impact of parameters on channel rate is studied by single factor experiment. Furthermore, the orthogonal experiment is adopted to analyze the effect degree of every parameter on channel rate. The research shows that the increase of fracturing fluid viscosity, fiber concentration and shooting density lead to the increase of chan- nel rate, the increase of pulse time and proppant concentration lead to the decrease of channel rate, and the increase of discharge rate lead to channel rate increase firstly and then decrease. When the viscosity is higher than 100 mPa.s, the effect degree of six pa- rameters from big to small is proppant concentration, pulse time, fiber concentration, discharge rate, fracturing fluid viscosity, and shooting density.