页岩气井滑溜水连续加砂技术研究与应用

Research and Application on Continuous Carrying Sand with Slick-Water in Shale Gas Well

摘要: 随着页岩气规模开发，滑溜水压裂液因其低黏、低摩阻、易滤失、低成本以及更适应特低渗、超低渗储层的压裂改造等特性，应用越来越广泛。滑溜水加砂可以分为段塞式和连续式两种模式。从各油气田统计数据来看，压后效果与加砂量呈一定的正相关关系，因此采用滑溜水连续加砂技术提高加砂量是必然也是最为有效的手段。通过对大型可视平板裂缝模拟系统的试验数据进行分析，掌握了滑溜水携砂规律，并进行了滑溜水连续加砂成功率影响因素分析，制作了连续加砂优化版图，确立了实施低粘滑溜水连续加砂工艺方案，同时结合现场施工经验，提出了实施连续加砂前确保成功率的预判方法。现场应用结果表明，该项加砂工艺可以实现控液提砂，提高加砂强度，在同等液量的情况下，加砂量提高100%~200%，压裂增产效果提高10%~30%。

Abstract: With the large-scale development of shale gas, fracturing fluid of slick-water has been more and more widely used due to its low viscosity, low friction, easy filtration, low cost and more suitable for stimulation of ultra-low permeability and ultra-low permeability reservoirs. The model of carrying sand with slick water is divided into plug type and continuous type. To improve the quantity of sand, continuous sand with slick-water technology is inevitable, and is also the most effective means. By analyzing the test data of large visual plate crack simulation system, the author masters the law of carrying sand with slick-water, and analyzes the influencing factors of the success rate of slick-water, and establishes continuous carrying sand optimized layout, and shows the plan for continuous sand with slick-water technology, combines with experience in fracturing field, and shows the forecasting methods before continuous sand. The results of field application show that continuous carrying sand is one method of carrying sand efficiently by more sand with less liquid, under the same liquid quantity, increasing the sand quantity by 100%~200% and increasing the fracturing stimulation effect by 10%~30%.