【摘要】 针对目前天然气气藏进入后期开采阶段后普遍产水并对天然气生产有较大影响的问题 ,特别是低压低渗致密性气藏中所存在的深井低压小底水工程情况 ,文章在深入研究超声空化作用物理原理的基础上 ,首次提出了利用超声波排水采气的方法。该方法的核心是在井下建立人工功率超声波场 ,通过功率超声对地层积水的空化作用 ,使地层积水的局部产生高温高压、并快速雾化 ,高效率雾化后的地层积水伴随着天然气生产气流沿采气油管排至地面 ,从而能有效地提高采气油管的带水能力 ,达到降低和排除井筒中积水、开放地层产气微细裂缝、提高单井产能的目的。应用该方法可有效延长气井自喷采气周期、提高天然气产气量 ,也可用于天然气采气井的早期防水、解堵和除垢工艺。文章提出的方法已获国家发明专利权 ,并将在未来的采气工程中发挥作用。更多还原

【Abstract】 Aiming to the problem of water production when gas reservoirs go to the later stage of production and gas production decreasing, especially to the gas reservoirs with low pressure, low permeability, dense formation, deep wells and little bottom water, based on the physical principle of ultrasonic cavitations, the article first proposes the water-removing and gas-recovering method with ultrasonic waves. The key of the method is to establish the artificial power-ultrasonic field in the down hole. By the cavitations of power-ultrasonic waves against the bottom-hole accumulated water, the water obtains high temperature and pressure locally, and is atomized quickly. The atomized water will be removed to the ground along the tubing with gas flow. So, the water-carrying capacity of the tubing will be improved greatly to get the goal to decrease and remove the bottom-hole accumulated water, open the tiny gas cracks of formations, and increase the single-well gas productivity. Applying the method, the flow period of gas wells can be prolonged effectively, and the gas production can be improved. The method can also be used for the early water control, broken down and scale removal. The method proposed in the article has obtained the state patent and will play big role for gas recovering in the future.更多还原