Application and Research of Wellbore Lifting by Chemical Viscosity Reducing Technology for Super Heavy Oil in Liaohe Oilfield
In view of the problem of high energy consumption associated with wellbore electric heating for lifting super heavy oil in Liaohe Oilfield, wellbore lifting technology with chemical viscosity reducing is developed. Test results indicate that the technology exhibits high viscosity reducing ratio (up to 99.9％) for super heavy oil, good automatic demulsifying and dewatering performance ( Water cut of treated oil is reduced to 3％ after settling at 85~C for 72h.) and good compatibility with demulsifiers used in CPUs (Water cut of treated oil is reduced to 1％ after 400ppm demulsifier is added to low viscosity oil/water emulsion and then automatic settling is allowed for 72h), resolving completely the contradiction between viscosity reducing and demulsifying and dewatering for super heavy oil. Pilot tests of the technology had been conducted in 8 wells and commercial application had been conducted in 32 wells in Special Oil Development Company in Liaohe Oilfield from Sept. 10<th> 2002 to sept.10 <th> 2004, achieving good application results. The results from the 40 wells indicate that the technology of wellbore chemical viscosity reducing can take the place of the technology of wellbore electric heating lifting to maintain normal production. The electric current of the pumping units in the test wells is reduced by 10-30A and the viscosity of the produced fluids at the wellhead is reduced by over 99％. Wastewater can be mixed in the process flow, realizing cyclic use of wastewater and thus saving lots of fresh water resources. The cost of oil lifting decreases by RMB￥38.56/t on the average after the chemical viscosity reducing technology is used and energy saving can reach RMB ￥5,066,800/a.
Xiaoming Wei Xilin Liu Dezhu Liu Chunshan Zhang
Liaohe Oilfield Company Panjin, Liaoning, China
国际会议
首届世界重油大会(The Technical Sessions of the First World Heavy Oil Conference)
北京
英文
493-499
2006-11-12（万方平台首次上网日期，不代表论文的发表时间）