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

作　　者：戴秀兰 魏俊 闫秀 王冰 严诗婷 唐雨 DAI Xiulan;WEI Jun;YAN Xiu;WANG Bing;YAN Shiting;TANG Yu(SSC-Jianghan Shale Gas Development Technology Service Company,Wuhan,Hubei 430074)

机构地区：[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

出　　处：《钻井液与完井液》2024年第2期262-269,共8页Drilling Fluid & Completion Fluid

基　　金：中石化江汉石油工程有限公司重点研发项目“复兴区块陆相页岩储层压裂工艺研究与应用”(SG2102-09K)。

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,3min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2 h,黏度稳定在50 mPa·s以上,携砂性能好,支撑剂2 h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 m^(3)/min,最高砂比30%、单段平均加砂220 m^(3),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。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 m^(3)/min,the highest sand/fluid ratio was 30%,and the sand used in one fracturing segment was averaged at 220 m^(3),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 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]