摘要
为研究温控化学压裂液的滤失特性,首次利用动态滤失仪分析了相变压裂液体积分数、温度、滤失压差、渗透率对滤失过程的影响.结果表明,相变压裂液体积分数越小、温度越高、滤失压差越大、渗透率越高,化学压裂液的滤失系数越大,且相变压裂液体积分数影响相对较小,而滤失压差和渗透率影响较为显著.因此,高温储层可通过注前置液的方式降低化学压裂液的滤失,且在高渗储层或采用大排量施工时有必要采取一定的降滤措施以提高液体效率.
Abstract
To investigate the filtration characteristics of temperature-controlled chemical fracturing fluids,a dynamic filtration instrument was employed to analyze the influence of phase change fracturing fluid volume fraction,temperature,filtration pressure difference,and permeability on the filtration process.The results indicate that a lower phase change fracturing fluid volume fraction,higher temperature,greater filtration pressure difference,and higher permeability correspond to an increased filtration coefficient of the chemical fracturing fluid.The phase change fracturing fluid volume fraction has a relatively minor impact,while the filtration pressure difference and permeability have significant effects.Thus,in high-temperature reservoirs,the filtration loss of chemical fracturing fluid can be mitigated by injecting a pre-fluid.Additionally,in high-permeability reservoirs or at high injection rates,certain filtration reduction measures should be implemented to enhance liquid efficiency.
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