脉动注水器的研制与应用

根据风琴管、亥姆霍兹振动腔的脉冲射流原理，结合模拟试验，优化设计了适合注水用的脉动射流喷嘴，该喷嘴可以利用注水井自身能量，将稳定注入水转化为周期脉冲射流，在注入井附近地层建立振动场，使地层疏通或产生裂缝网，提高渗透率。计算机模拟此种喷嘴在非淹没状态下振幅可达９０％以上，现场试验３６口井，有效率达９５％，平均注水压力降低幅度达１１．６％。

Development and application of pulsed water injector.

According to the principle of pulse jet flow of Helmholtz vibration cavity, on which an organ pipe is based, and through modeling experiments, a jetting nozzle suitble for water injection has been optimized and designed. This jetting nozzle can convert stablly injected water into periodical pulse jet flow using the energy of a water injetion well itself, so that a vibrating field is set up in formation close to a injection well to dredge formation and creat fracture network, consequently permeability is improved. In a computer simulation of this kind of nozzle, the amplitude in non submerging state can reach more than 90%. The nozzle has been tested in 36 wells with the effective ratio coming up to 95% and the average water injection pressure dropping by 11.6%.