Cementing technology of anti-high temperature latex cement slurry for Changshen 5 well in Jilin oilfield

Changshen 5 well is the deepest natural gas wildcat well in Jilin oilfield,which is with 5321 m well depth and 180℃ static temperature.For technical difficulties in production casing cementing such as high temperature,deep well,large temperature difference of whole seal,sour gas corrosion,and so on,technical measurements such as leaking proof,channeling prevention and anti-corrosion are needed to consider in cementing.In order to ensure cementing quality of the well,analysis on technical difficulties is done,and anti-high temperature pad fluid and latex cement slurry system is developed.Production casing cementing construction operation of Changshen 5 well is accomplished successfully using domestic oil well cement,admixture and additive completely in terms of optimization design of cementing technology parameter and a series of laboratory researches such as thermal stability,thickening time,strength development,water loss at high temperature,medium stop simulation,and so on.Although additive cost is equivalent to one third of imported products,the cementing has 100% qualified segment and 96.46% high quality segment,which provides reliable approach for cementing technology of high temperature and deep layer natural gas well nationalization in Songliao basin.