【摘要】 泡沫压裂在提高低渗砂岩和碳酸盐储层的油气产量方面取得了极其显著的效果 ,得到了广泛应用。但过去针对CO2 泡沫压裂液的实验研究大多压力较低 ,CO2 处于气体状态 ,而在实际压裂工艺中对CO2 泡沫压裂液来说 ,CO2 常处于超临界状态。为了更好地预测压裂效果 ,对处于超临界状态时的CO2 泡沫压裂液的流变参数进行研究就显得很有必要。为此 ,建立了一套大型的高压、高温实验系统 ,利用管式流变仪来研究实际压裂条件下CO2 泡沫压裂液的流变特性。结果表明 :该压裂液具有剪切稀化性质 ,可用幂律模型处理 ;通过数据处理得到了该压裂液在不同压力、温度和泡沫质量下的有效粘度、流变指数和流变系数 ;并详细研究了压力、温度和泡沫质量对泡沫压裂液有效粘度、流变指数和流变系数的影响更多还原

【Abstract】 CO 2 foam fracturing fluid has been applied successfully in the exploration of low-permeability oil and/or gas sand and carbonates. Most of the experiments were finished at lower pressure, so that CO 2 was in the gas state. But, in the field, CO 2 is normally in the supercritical state. In order to accurately evaluate the actual fracturing effect, it is necessary to study the flow behavior of CO 2 foam fracturing fluid simulating the field conditions. A high pressure and high temperature flow loop was constructed to study the rheological properties of CO 2 foam fracturing fluid. The experiment results show that the foam fluid is a shear-thinning fluid, can be simulated with power-law model. The effective viscosity and power-law parameters were measured under different flow conditions, and the influences of pressure, temperature and foam quality on the flow behavior parameters were discussed in detail.更多还原