摘要
无动力加药工艺以掺水压力与套管压力差为动力源,利用毛细管阻力节流,设备流程简单,节能环保。本文报导了无动力井口加注液体防垢剂的实验规律,考察了黏度与毛细管内径、长度,及掺水压力和套管压力差对液体防垢剂流量的影响。结果表明:液体防垢剂流量随黏度增加而减小,随加药压差增大而增加,随毛细管长度增加而减小,随毛细管内径增加而增加。毛细管内径变化对流量影响显著。在大庆采油一厂北一区断东二类油层强碱体系三元复合驱试验区5口井现场试验,毛细管内径0.3mm或0.35mm、长1.6m或1.3m,掺水温度43℃,药剂黏度1.08mPa·s,加药压差0.3MPa,产出水中防垢剂平均浓度为28.3mg/L,和设计产水的药剂浓度30mg/L相近。平均检泵周期由137d延长至大于372d,最长大于507d。
The non-dynamic technology of injecting liquid scale inhibitor at wellhead used the pressure difference between the water blending pressure and the casing pressure as power source,and was throttled by capillary resistance.This technology had many advantages,such as simple process equipment,energy conservation and environmental protection,etc.The experiment discipline of this technology was reported and the impacts of the viscosity of liquid scale inhibitor agent,the inner diameter and length of the capillary and the pressure difference between the water blending pressure and the casing pressure on liquid scale inhibitor flow were investigated.The results showed that the flow volume of liquid scale inhibitor decreased with increasing the viscosity and the length of capillary,but increased with increasing the dosing pressure difference and the capillary inner diameter.The capillary inner diameter had significant impact on the flow volume.The experiment condition of the technology applied in 5 wells on the first oil production factory of Daqing oilfields was：0.3 mm or 0.35 mm inside diameter of capillary,1.6 m or 1.3 m length of capillary,43℃ water blending temperature,1.08 mPa·s the viscosity of scale inhibitor,0.3 MPa dosing differential pressure.The average concentration of scale inhibitor in the output water was of 28.3 mg/L,which was approach to the designed value 30 mg/L.The average value of the inspection period of pump was extended from 137 days to more than 372 days,and the longest value had reached 507 days.
出处
《油田化学》
CAS
CSCD
北大核心
2010年第4期453-456,共4页
Oilfield Chemistry
关键词
无动力加药
液体防垢剂
毛细管
流量
现场试验
大庆油田
non-dynamic dosing
liquid scale inhibitor
capillary
flow
field test
Daqing oil fields
