Cementing technology of gas well in Shuangtuozi region of Jilin Oilfield

Slurry loss and gas channeling between the formations often occur during cementing owing to the low pressure and easy lost circulation,imparity pressure gradient,long gas reservoir distribution interval,alternating with gas and water layers exist in the top formations in Shuangtuozi region of Jilin Oilfield.In this paper,solving methods to gas well cementing are presented,anti-channeling cement additives are selected based on analyzing the necessary conditions for the anti-channeling cement slurry system,and a new G302 cement slurry system is developed.What’s more,a comprehensive anti-channeling technology is developed based on employing G302 anti-channeling cement slurry and separably setting cement slurry.Technical measures such as JSS-1 drilling fluid and NCH-2 spacer fluid are proposed to improve displacement efficiency suitable for low-pressure and easy lost circulation conditions.This technology has been applied in Shuangtuozi region for four well-times in 2005 and good cementing results have been achieved.For that,the problem of long production interval cementing in multiple series of strata of this region has been solved and a set of comprehensive systematic technologies have been developed to guide the gas well cementing in this region,providing an effective solution to similar gas well cementing problems.