水力喷射压裂射流密封压力场研究

摘要

Hydrajet-fractruing is a new stimulation technique in oilfield. It is very necessary to research jet parameters for the technique. Based on the experiments and computational fluid dynamics, the jet sealing pressure field in casing annular had been performed. The velocity and pressure distribution is obtained by fluid simulation. The following parameters were analyzed; nozzle space location, the number of jet, differential pressure and nozzle diameter. The result shows that the sealing pressure will be increased with the jetting pressure and nozzle diameter increasing. The sealing pressure field created by jetting has good independence. The space location and the number of nozzle have no influence to the sealing pressure. The conclusions can provide scientific basis for the oilfield performance of hydrajet-fracturing.%水力喷射压裂工艺是集水力射孔和压裂一体的新型油田增产技术.本文在室内试验基础上,运用计算流体力学方法,对水力喷射压裂过程中射流密封压力场开展研究.得到了井下水力射流在套管环空和孔道内部的压力及速度分布.揭示了喷嘴空问位置、喷嘴数量、射流压力和喷嘴直径对射流密封压力场影响规律.结果表明:高速射流之间具有很强的独立性,喷嘴空间位置和喷嘴数量不会影响射流密封压力；孔道压力随射流压力和喷嘴直径的增大而增加.研究结果对水力喷射压裂工艺现场施工提供科学依据.