Study On Low Damage Well Killing Fluid System In Middle-shallow Formation

Jilin Oilfield gangliosides in Yitong through, small co-Lung, Shuangtuozi four reservoirs, the main gas reservoir. Four blocks of five different Sensing Properties, a certain degree of sensitivity to easily create the reservoir caused by falling debris particles, migration of pore or channel block, causing permeability damage.In this paper, the main gas layer on the sensitivity of Jilin Oilfield and mechanism of injury, to carry out the killing fluid reservoir damage assessment system on the analysis of various reservoir for low-damage control fluid system. The results show that (1) 1 #, 2 # kill fluid on Shuangtuozi, small co-Lung, Honggang, Iraq reservoir through four blocks were a great degree of core damage, injury level of 50 to 98% savings The higher the injury rate increased permeability layer; (2) 3 # kill fluid on the pre-appraisal block in low permeability reservoirs (reservoir gas permeability is less than 10×10^-3μm² pm) are very small degree of core damage , injury rate of about 10%, while for high-permeability reservoir is relatively large degree of core damage, injury rates in the 70 90%, and that with the increase in permeability, damage rate increased. (3) 4 # kill fluid that is 2% KCl solution on Shuangtuozi, small co-Lung, Honggang, Iraq reservoir through four blocks of low permeability cores (permeability less than 10×10^-3μm²) the degree of injury in 20 25%, and for high permeability reservoirs, the extent of its damage between 10 to 17%.Developed low-friction, low filtration medium density, high-density low fluid loss control fluid system 3, after evaluation the following conclusions: (1) suitable for all low-friction control fluid reservoir system: (2) low-density control fluid filtration system on the level of each block were not significant core damage, injury rate for high-permeability layers in between 13% and 19%, while the injury rate for the low permeability layer of 20% to 22.5% of rooms. (3) high-density low-killing fluid filtration system, the degree of each block of core damage are not very high injury rate for high permeability of 15% to 18%, and the injury rate for the low permeability layer at between 18% 26.3%.