摘要
针对常规胍胶压裂液悬砂性差、水中不溶物含量高污染地层等难题,采用GTA(C6H14ClNO)对胍胶(GG)进行醚化改性,通过环氧化合物的双分子亲核取代反应引入疏水碳链,得到GTA-GG,将其作为压裂液的主剂,研究GTA-GG与体系悬砂性之间的关联。结果表明,压裂体系悬砂性受主剂粘度与水中不溶物含量的影响,而GTA-GG可利用其长分子链与高相对分子质量优化此两种性能,从而提升支撑剂铺置效率,减小沉降速度,增大体系悬砂性能;测量GTA-GG压裂液在变温条件下的应用特性,其实验数据显示,0.3%GTA-GG与0.3%XJL-2交联所得冻胶的粘度为203.6 mPa·s,水中不溶物含量为6.8%,支撑剂沉降速度为0.071 mm/s;100℃条件下,初始滤失量、滤失系数、滤失速度分别为3.810×10^-4m^3/m^2,0.141×10^-4m^3/m1/2,0.685×10^-4m^3/(m^2·min);添加0.02%的DQPJ破胶剂,2 h破胶后溶液粘度为1.7 mPa·s,表面张力为23.91 mN/m。GTA-GG体系悬砂性得到提升,各项性能良好,适用于中高温低渗储层压裂作业。
Aiming at the problems of poor suspended sand property of conventional guar gum fracturing fluid and high water insoluble matter content in polluted formation,etc.GTA-GG was synthesized by etherification of guanidine gum(GG)with GTA(C 6 H 14 ClNO).The hydrophobic carbon chain was introduced through the bimolecular nucleophilic substitution reaction of epoxy compounds.GTA-GG was used as the main fracturing fluid agent to study the relationship between GTA-GG and suspended sand.The result shows that the suspension property of fracturing system is affected by the viscosity of main agent and the content of insoluble substance in water,and GTA-GG can optimize these two properties through long molecular chain and high molecular weight,thus increasing the efficiency of proppant placement,reducing the settling velocity and increasing the suspension property of fracturing system.The application characteristics of GTA-GG fracturing fluid at different temperatures were measured.The experimental data show that the gel obtained by 0.3%GTA-GG and 0.3%XJL-2 has a viscosity of 203.6 mPa·s,an insoluble content of 6.8%in water and a settling velocity of 0.071 mm/s.The rheological property is good,the initial filtration loss,the filter loss coefficient and filtration rate under the condition of 100 DEG C are 3.810×10^-4 m^3/m^2,0.141×10^-4 m^3/m 1/2,0.685×10^-4 m^3/(m^2·min),respectively.When 0.02%gel breaker DQPJ,2 h was added,the viscosity of the solution was 1.7 mPa·s and the surface tension was 23.91 mN/m.The suspended sand property of the system has been improved and its properties are good,so it is suitable for fracturing operation of medium and high temperature and low permeability reservoirs.
作者
孙孟莹
潘一
王瞳煜
杨双春
ABUBAKAR RANA MUHAMMAD
李敏
SUN Meng-ying;PAN Yi;WANG Tong-yu;YANG Shuang-chun;ABUBAKAR RANA MUHAMMAD;LI Min(College of Petroleum and Natural Gas Engineering,Liaoning Shihua University,Fushun 113001,China;College of International Education,Liaoning Shihua University,Fushun 113001,China;College of Chemical Engineering and Environment,China University of Petroleum,Beijing 100000,China)
出处
《应用化工》
CAS
CSCD
北大核心
2020年第8期2004-2008,共5页
Applied Chemical Industry
基金
辽宁省2017年科技厅项目(20170520344)
辽宁省2017年教育厅项目(L2017LFW012)
中石油2017年科技创新基金项目(2017D-5007-0201)。
关键词
石油
水基压裂液
改性胍胶
性能
粘度
沉降
petroleum
water-base fracturing fluid
modified guanidine gum
property
viscosity
sedimentation
