哈特曼声波发生器在出砂井解堵中的室内实验与应用

Experimental study and application of plugging removal by Hartmann acoustic generators on sandy wells

一些出砂井在生产过程中,由于化学防砂效果较差及机械防砂有效期短等原因,极易造成近井地带和井底堵塞。针对该问题,提出了声波解堵与绕丝筛管防砂相结合的方法,即绕丝筛管防砂与声波解堵同步进行。设计了一套油层模拟器,并利用它模拟了地层堵塞和哈特曼声波发生器解堵的实验过程。研究结果表明,出砂井生产时存在着极限压力和极限产量,超出该极限值,地层会严重出砂,造成井底和近井地带堵塞;声波解堵后,相对于污染地层的渗透率恢复程度最高达到了336.92%,相对于原始地层的渗透率恢复程度最高达到了76.92%。现场应用结果表明,该方法对绕丝筛管堵塞不供液停产井均见到了较好的解堵效果,产液量和产油量均得到了大幅度提高,平均单井增液量为20t/d,平均单井增油量为5.4t/d;同时,该方法不仅可以延长绕丝筛管防砂油井的生产周期而且能够提高出砂地层注水井的吸水能力。

In the process of sandy wells production,immediate vicinity of wellbores and downholes are blocked easily because of poor effect of chemical sand control and narrow validity of mechanical sand control.Aiming at this issue,the method of plugging removal by acoustic wave assisting sand control by wire wrapped liner was proposed.A reservoir emulator was designed to simulate formation plugging,as well,experimental study of plugging removal by Hartmann acoustic generators was investigated.The result shows that,sandy wells have threshold pressure and yield,beyond the limit values,immediate vicinity of wellbores and downholes will be blocked.Maximum of return permeability relative to damaged layers and virgin formation reach 336.92%and 76.92%after plugging removal by acoustic wave.Field application indicates that,this method can recover and promote daily oil production of damaged wells and can not only extend production cycle of sand controlled wells with wire wrapped liners but also improve water absorbability of injection wells in sandy layers. Average increased liquid and oil yield for single well is 20t/d and 5.4t/d respectively.