华北储气库韧性水泥浆及增韧机理  

The Toughening Mechanisms of Tough Cement Slurries for the Underground Gas Storage in North China

作　　者：李立昌 曹洪昌 高阳 刘景丽 马骏 黄建 刘俊华 孙文昭 LI Lichang;CAO Hongchang;GAO Yang;LIU Jingli;MA Jun;HUANG Jian;LIU Junhua;SUN Wenzhao(Engineering Technology Research Institute,BHDC,Tianjin 300451;No.1 Cementing company,BHDC,Renqiu,Hebei 062552;No.2 Drilling Engineering Company,BHDC,Langfang,Hebei 065000;Chengdu University of Technology,College of Energy,Chengdu,Sichuan 610059)

机构地区：[1]渤海钻探工程技术研究院,天津300451 [2]渤海钻探第一固井分公司,河北任丘062552 [3]渤海钻探第二钻井工程分公司,河北廊坊065000 [4]成都理工大学能源学院,成都610059

出　　处：《钻井液与完井液》2025年第2期239-246,共8页Drilling Fluid & Completion Fluid

基　　金：中国石油集团公司项目“高温高压固井与测试完井技术集成配套与应用”(2023ZZ20)。

摘　　要：储气库作为中国“能源保供”的重点工程,具备季节调峰、事故应急及国家能源战略储备三大功能。华北储气库普遍具有地质条件复杂、埋藏深、井底温度高、密度窗口窄、漏失风险大、一次封固段长、井筒长期密封完整性要求高等固井难点,普通的水泥浆难以满足该条件下的固井要求。通过大量实验研究出一种多功能活性增韧材料HFOC,探究了加入HFOC的韧性水泥浆的综合性能及其增韧机理,形成一套适用于储气库固井的韧性水泥浆体系,并优化了预应力固井等工艺技术。结果表明,韧性水泥浆体系密度范围为1.88~1.92 g/cm^(3),稠化时间可调,直角稠化,沉降密度差为0,游离液为0,API失水量不大于50 mL,7 d弹性模量小于6.48 GPa,80℃、24 h抗压强度大于14 MPa。从物理和化学两方面探索了韧性水泥浆的增韧机理,水泥成分中铁铝酸四钙对水泥石的韧性和力学性能有积极影响,铁铝酸四钙含量的增加可以更好地防止微裂纹扩展,提高水泥环的密封完整性。该项技术成功应用于华北储气库生产套管固井,固井质量满足储气库要求,可为其他储气库固井提供技术支持和借鉴。As the important engineering of China’s“energy resource supply guarantee”,underground gas storage(UGS)has three functions,which are seasonal peak shaving,emergency response to accidents and national energy strategic reserve.The formations into which the UGSs have been built in north China generally have such characteristics as complex geological conditions,deep buried depths,high bottom hole temperatures,narrow density windows,high fluid loss risks,long intervals that need to be cemented in one job,as well as rigorous requirements for borehole integrity because of long-term sealing of the wellbores,etc.Common cement slurries do not have the required properties to satisfy the requirements of well cementing under these conditions.To solve these problems,a multi-functional active toughening material HFOC was developed through extensive experimental research.The general performance and the toughing mechanisms of tough cement slurries were investigated.Using HFOC,a tough cement slurry was formulated for use in cementing UGS wells,and the well cementing techniques,such as prestressed well cementing,were also optimized for the use of the new cement slurry.Laboratory experimental results show that the tough cement slurry has its density adjustable between 1.88 g/cm^(3) and 1.92 g/cm^(3),the thickening time of the cement slurry is adjustable and the cement slurry shows right-angle thickening behavior,the top and bottom density difference of the cement slurry is zero,no free water is observed in the cement slurry,the API filter loss is less than 50 mL,the 7-day elastic modulus is less than 6.48 GPa,and the 80℃/24-hour compressive strength is greater than 14 MPa.The toughening mechanisms of the tough cement slurry are investigated from both physical and chemical aspects.It was found that tetracalcium aluminoferrite(C4AF)in a cement has positive effects on the toughness and mechanical properties of the set cement;an increase in the content of C4AF in the cement can better prevent the extension of the micro fractures

关 键 词：储气库 韧性水泥浆 增韧机理 铁铝酸四钙 固井工艺 

分 类 号：TE256[石油与天然气工程—油气井工程]