Research on Wellbore Blocking Mechanism and Field Unblocking Process in Linxing Gas Field
Since Linxing area has been put into production,the problem of wellbore blocking has become in-creasingly serious,leads to the failure of gas well production test and stimulation operation.Combined with the results of particle size analysis,inorganic composition XRD and infrared analysis,it is clear that the composition of the blocking mainly includes quartz,stone salt,insoluble salt scale(mainly aluminate silicate scale),a small amount of iron scale and solid sand gravel,etc.,the main types of blocking are sand blocking,corrosion scale and salt blocking.Two kinds of unblocking agent systems,HYJD-10 and CAWF,were optimized to solve the problem through unblocking test.The highest dissolution rate of static dissolution experiment could reach 25.3％and 18.3％respectively,and the optimal permeability improvement rate of replacement experiment could reach 105.9％and 91.3％respectively.Combined with the injection of unblocking agent,gas lift and foam fluid,the average production increase of single well is not less than 9 000 m3/d,and the highest increase is 25 000 m3/d.This study provides a reference for the tight gas wellbore unblocking test.
NETL
NSTL
万方数据
维普
