延长气田微弱伤害胍胶压裂液体系的研究应用

本文针对延长气田(深井)开发的微弱伤害胍胶压裂液体系为:0.35%胍胶+0.50%黏土稳定剂+0.50%起泡助排剂+0.15%温度稳定剂+0.14%Na2CO3+0.10%杀菌剂+0.015%压裂专用螯合剂,压裂液体系交联剂为专利产品,施工过程中采用了专利产品高分子断裂催化剂取代了尾追的过硫酸铵。该压裂液体系具有良好的性能,在130℃时体系经过120 min剪切黏度仍可维持在100 mPa·s左右,在90℃的条件下测定压裂砂沉降速度为0.008 37 cm/s,沉降速度大幅度降低。与目前现场使用的胍胶压裂液体系相比,胍胶用量降低率大于30%,岩心伤害率下降率为59.87%。经过现场应用表明当地层温度达到133℃时仍可按设计顺利加砂,平均砂比可达到21.5%,对生产数据进行统计发现返排效果、产气效果与邻井相比提升明显,产气提升量最低达到了0.196 2×10^4m^3/d,提升率最低达到了35.09%,该压裂液体系不仅具有良好的性能优势,且可实现降本增效的作用,具有良好的应用价值。

The study of the weak damage guanidine gum fracturing fluid system of Yanchang gasfield

This paper report the weak damage guanidine gum fracturing fluid system of Yanchang gasfield(deep well), the fracturing fluid system was: 0.35 % guanidine gum+0.50 %clay stabilizer+0.50 % foaming and clean up additive +0.15 % temperature stability agent+0.14 % Na2CO3+0.10 % bactericide +0.015 % chelating agent for fracturing.In this system,the crosslinking agent of fracturing fluid series is a patented product, and the breaking catalyst of polymer chain used in the process of subsequent additional agent replace the ammonium persulfate is also a patented product.The fracturing system has good heat resistance and shear resistance at 130 ℃, after 120 minutes of shearing, the shear viscosity can still be maintained at about 100 mPa·s.The decline velocity of fracturing sand in the fracturing was0.008 37 cm/s, the decline rate was greatly reduced. Compared with conventional guanidine system, the amount of guanidine was reduced by more than 30 % and the damage rate decreased to 59.87 %.The engineering construction was successful at the stratum temperature of 133 ℃ through experiments,the sand was completed according to the design and the average sand ratio can reach 21.5 %.Compared with the adjacent gas wells, the fracturing fluid flowback result and gas production increased obviously, the gas production increased reach0.196 2×10^4 m^3/d, the lowest improvement rate of gas production reached 35.09 %. The fracturing fluid system has a better advantage at the property aspect and the economic aspect,which can reducing the cost and enhance the effect of fracturing construction and has a good application value.