浅层低渗透油气井超低温压裂液体系研究  

Study on ultra-low temperature fracturing fluid system for shallow oil and gas wells with low permeability

作　　者：李风光 吕选鹏 王晓磊 张华[4] 曹孟君 尹海霞 LI Fengguang;LYU Xuanpeng;WANG Xiaolei;ZHANG Hua;CAO Mengjun;YIN Haixia(Engineering Technology Research Institute,CNPC Bohai Drilling Engineering Co.,Ltd.,Tianjin 300457,China;Engineering Technology Division,CNPC Bohai Drilling Engineering Co.,Ltd.,Tianjin 300457,China;Downhole Technology Service Company,CNPC Bohai Drilling Engineering Co.,Ltd.,Tianjin 300280,China;Oil&Gas Cooperation and Development Company,CNPC Bohai Drilling Engineering Co.,Ltd.,Tianjin 300280,China;Petroleum Engineering General Contracting Branch,CNPC Bohai Drilling Engineering Co.,Ltd.,Xi′an,Shaanxi 710016,China)

机构地区：[1]中国石油集团渤海钻探工程有限公司工程技术研究院,天津300457 [2]中国石油集团渤海钻探工程有限公司工程技术处,天津300457 [3]中国石油集团渤海钻探工程有限公司井下技术服务分公司,天津300280 [4]中国石油集团渤海钻探工程有限公司油气合作开发分公司,天津300280 [5]中国石油集团渤海钻探工程有限公司石油工程总承包分公司,陕西西安710016

出　　处：《油气井测试》2021年第5期37-43,共7页Well Testing

基　　金：中国石油集团渤海钻探工程公司2017年重大研发项目“超低温压裂液体系研究与现场试验”(2017ZD10K-02)。

摘　　要：低渗透储层埋深1800 m以浅、温度低于60℃的浅层油气井,常规压裂液体系在压裂施工过程中存在高砂比携砂和低温破胶技术难题。通过提高空间网状结构的交联效率,研发了低浓度有机硼交联剂,根据氧化还原反应原理,研发了低温破胶剂,形成了超低温压裂液体系。实验结果表明,当瓜胶用量为0.25%、交联比100∶0.3,该体系在170 s^(-1)、连续剪切90 min后黏度维持在65 mPa·s以上,满足现场施工技术要求;最低破胶温度可低至20℃,在120 min内完全破胶,破胶液黏度为2.3 mPa·s,残渣含量为126.2 mg/L,对储层伤害低。2018年以来该压裂液体系在青海油田现场应用200余口井,最高携砂砂比达30%,总用液量达10×10^(4) m^(3)以上,成功率100%,最高单井日产油达10.68 t,为青海油田低温浅层油气井效益开发提供有力的技术支撑。For shallow oil and gas wells with a buried depth within 1800 m and a temperature lower than 60℃,there are technical problems of high sand ratio sand carrying and low temperature gel breaking in the fracturing operation of conventional fracturing fluid system.By improving the crosslinking efficiency of spatial network structure,a low concentration organic boron crosslinking agent was developed.According to the principle of redox reaction,a low-temperature gel breaker was developed to form an ultra-low temperature fracturing fluid system.The experimental results show that when the amount of guar gum is 0.25%and the crosslinking ratio is 100∶0.3,the viscosity of the system is maintained above 65 mPa·s after 170 s^(-1) and continuous shear for 90 min,which meets the technical requirements of on-site construction;The minimum gel breaking temperature can be as low as 20℃,and the gel can be completely broken within 120 min.the viscosity of gel breaking liquid is 2.3 mPa·s,and the residue content is 126.2 mg/L,which has low damage to the reservoir.Since 2018,the fracturing fluid system has been applied in more than 200 wells in Qinghai Oilfield,with a maximum sand carrying ratio of 30%and a total fluid consumption of more than 10×10^(4) m^(3),with a success rate of 100%.After using this technology,the maximum daily oil production of a single well reaches 10.68 t,which provides strong technical support for the benefit development of low-temperature shallow oil and gas wells in Qinghai Oilfield.

关 键 词：浅层油气井 低渗透储层 超低温压裂液 羟丙基胍胶 有机硼交联剂 低温破胶剂 青海油田 

分 类 号：TE348[石油与天然气工程—油气田开发工程]