Research on KD-4 flowing gel profile control system and its application

In view of the problems of agglomeration and alcohol volatility exist in field application of phenolic resin cross linking agents containing alcohol used for profile control on high-temperature reservoir,experimental research is conducted on moving gel integrating technologies,formula composition,gelling time,effects of thermal stability.Therefore,KD-4 profile control formula,which takes water soluble pre-polymerization resin cross linking agent with methylolation as its main body.Lab test is conducted on gelling time and thermal stability of KD-4 profile control system,as well as physical model test study on pre-slug and mobility is carried out.According to experimental results,total slug is designed as 'pre-slug + main plug + conservation plug + oil displacement plug(determined by well conditions)'.Gelling viscosity alters from high to low.Since July 2006,the technology has been applied to six wells,with the effective rate of well groups reaching 100%.By the end of October 2007,according to the stationary point method,output of crude oil has totally increased by 16158.7 tons.It is indicated that the technology has performed well with stable profile control performance and scientific design.