水平井自适应控水与砾石充填复合工艺试验

在易出砂地层水平井开发中，单独应用自适应调流控水筛管难以实现良好的防砂效果，需要研究一种自适应调流控水与砾石充填相结合的新型完井工艺。为此，对影响充填砾石运移的排量、砂比、冲筛比、漏失量、携砂液黏度等试验工艺参数进行设计优化。根据试验工艺参数设计结果，自主设计并搭建水平井自适应调流控水砾石充填的地面模拟试验装置，并开展两次水平井自适应调流控水砾石充填试验。试验结果表明，优选的低密度砾石，解决了充填排量受限的难题。在优选的充填参数条件下，充填效率达到100%。充填砾石的轴向渗流阻力远大于径向渗流阻力，可实现环空封隔器作用，充分发挥调流控水装置的控水稳油功能。最终得到合理的施工参数范围，为现场应用提供有效指导。

Experimental Study on Adaptive Water Control and Gravel Packing in Horizontal Wells

In the development of horizontal wells for easy production of sand, it is difficult to achieve good sand control effect by using adaptive flow-regulating water-control screen alone. It is necessary to study a new completion technology combining adaptive flow control and gravel packing. To this end, design and optimization were performed for experimental process parameters affecting the displacement, sand ratio, flushing ratio, loss of the transported gravel, and viscosity of the sand carrying fluid. According to the design results of the test process parameters, a ground-based simulation experimental device was independently designed and built for adaptive flow control and gravel packing in horizontal wells, based on which the experiment was performed twice. The test results show that the optimized low-density gravel solves the problem of limited packing displacement. Under the optimized packing parameters, the packing efficiency reached 100%. The axial seepage resistance of the packed gravel is much larger than its radial seepage resistance, realizing the function of an annulus packer, and the function of water control and oil stabilization of this flow-regulating water-control device is fully exerted. Eventually, reasonable ranges of construction parameters are obtained to provide effective guidance for field applications.