一种重建井筒用胍胶压裂液的制备及性能
Preparation and properties of A Guanidine Gel Fracturing Fluid System for Wellbore Reconstruction
戴秀兰 1魏俊 1闫秀 1王冰 1严诗婷 1唐雨1
作者信息
- 1. 中石化江汉石油工程有限公司页岩气开采技术服务公司,武汉 430074
- 折叠
摘要
为了解决重建井筒重复压裂施工面临的压裂液成本高、施工摩阻高、施工压力波动大、加砂困难等问题,合成了一种接枝改性胍胶和多级螯合交联剂,形成了一种适用于重建井筒重复压裂用胍胶压裂液.该压裂液体系溶胀性能好,3 min黏度可达到最高黏度的 87%;组分剂量低,3.8 g/L的加量液体黏度与普通胍胶 6 g/L的加量相当;降阻率高于 70%,残渣含量小于 70 mg/L,在 150℃条件下剪切 2h,黏度稳定在 50 mPa·s以上,携砂性能好,支撑剂 2h基本无沉降.该压裂液在首口全国产化的重复压裂重点井进行了应用,最高排量 17.5 m3/min,最高砂比 30%、单段平均加砂 220 m3,解决了重复压裂施工加砂困难的难题,取得了良好的应用效果.
Abstract
In reconstructing wellbores by refracturing of the reservoirs,several problems such as high cost of the fracturing fluids as well as difficulties in controlling friction and adding sands into the fracturing fluids,need to be solved.In this study a guar gum modified by graft and a multilevel chelating crosslinking agent are synthesized and are used to formulate a guar gum fracturing fluid for reconstructing wellbores through refracturing.This fracturing fluid has good swelling property,its 3 min viscosity can be as high as 87%of its maximum viscosity.The viscosifying capacity of this new guar gum is better than that of the conventional guar gum;A fracturing fluid treated with 3.8 g/L of this new guar gum has viscosity that is the same as the fracturing fluid treated with 6 g/L conventional guar gums.This new guar gum reduces the friction of fracturing fluids by at least 70%and the content of residues left in a used fracturing fluid is less than 70 mg/L.After shearing at 150℃ for 2 h,the viscosity of the fracturing fluid is 50 mPa∙s or higher.The fracturing fluid has good sand carrying capacity,almost no settling of proppants is found after 2 h of standing of the fracturing fluid.This fracturing fluid has been applied on the first well fractured with equipment and facilities that are all homemade.In the fracturing operation,the flowrate of the fracturing fluid was 16 m3/min,the highest sand/fluid ratio was 30%,and the sand used in one fracturing segment was averaged at 220 m3,solving the difficulty of adding sand into the fracturing fluid.Good application results are achieved in this operation.
关键词
重建井筒/胍胶压裂液/接枝改性/多级螯合/性能评价/现场应用Key words
Wellbore reconstruction/Guar gum fracturing fluid/Graft modification/Multi-level chelation/Performance evaluation/Field application引用本文复制引用
基金项目
中国石化江汉石油工程有限公司重点研发项目(SG2102-09K)
出版年
2024
国家科技期刊平台
NSTL
万方数据