适用于储气库固井自愈合水泥浆体系
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摘要
针对储气库在交变载荷作用下易发生封隔失效的问题,优选了热熔型自愈合材料RS-1,研究了其对水泥石自愈合的影响规律,同时为改善体系水泥石的弹、韧性及胶结强度,加入纤维增韧剂XW46和膨胀剂BS500,配合其他外加剂形成了密度1.89 g/cm~3的自愈合水泥浆体系,研究了该体系的常规性能、自愈合性能和力学性能。研究结果表明,自愈合水泥石1 d愈合缝宽可达150μm以上;7 d压折比与胶结强度较常规水泥浆分别提高33%、67%;弹性模量仅5854 MPa,弹性极限应力与应变则分别为37 MPa、0.77%,同时交变循环应力加载第7周时弹性恢复率达77%以上。该自愈合水泥浆体系适用于储气库75数90℃的井口压力为13数37 MPa范围的储气库固井。图5表5参16
Aiming at the problem that gas storage is prone to seal failure under alternating load,a hot-melt self-healing material RS-1 was selected and its influence on self-healing of cement paste was studied. At the same time,in order to improve the elasticity,toughness and cementing strength of cement paste,fiber flexibility agent XW46 and expansive agent BS500 was added with other additives to form a self-healing cement paste system with a density of 1.89 g/cm3. The conventional properties,self-healing properties and mechanical properties of the system were studied. The results showed that the 1-day healing crack width of cement paste could reach more than 150 μm;the 7-day compression-folding ratio and cementation strength of cement paste could be increased by 33% and 67%,respecitively,compared to that of the conventional cement paste;the elastic modulus was only 5854 MPa,while the elastic limit stress and strain was 37 MPa and 0.77%,respectively,and the elastic recovery rate was over 77% after 7 times of cyclic stress loading. The self-healing cement paste system is suitable for gas storage cementing with wellhead pressure rang of 13—37 MPa at the temperature of 75—90℃.
Aiming at the problem that gas storage is prone to seal failure under alternating load,a hot-melt self-healing material RS-1 was selected and its influence on self-healing of cement paste was studied. At the same time,in order to improve the elasticity,toughness and cementing strength of cement paste,fiber flexibility agent XW46 and expansive agent BS500 was added with other additives to form a self-healing cement paste system with a density of 1.89 g/cm3. The conventional properties,self-healing properties and mechanical properties of the system were studied. The results showed that the 1-day healing crack width of cement paste could reach more than 150 μm;the 7-day compression-folding ratio and cementation strength of cement paste could be increased by 33% and 67%,respecitively,compared to that of the conventional cement paste;the elastic modulus was only 5854 MPa,while the elastic limit stress and strain was 37 MPa and 0.77%,respectively,and the elastic recovery rate was over 77% after 7 times of cyclic stress loading. The self-healing cement paste system is suitable for gas storage cementing with wellhead pressure rang of 13—37 MPa at the temperature of 75—90℃.
引文
[1]刘凯.储气库固井水泥浆体系的研究与应用[D].大庆:东北石油大学,2014.
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[10]申薛靖,刘科海,高东岳,等.微胶囊型自愈合聚合物基复合材料研究进展[J/OL].复合材料学报:1-17[2018-09-07].https://doi.org/10.13801/j.cnki.fhclxb.20180111.002.
[11]杨敏毅,曾俊杰,王胜年,等.渗透结晶材料对混凝土裂缝自愈合的影响[J].硅酸盐通报,2017,36(10):3542-3547.
[12]YUAN B,YANG Y G,TANG X,et al.A starting pressure prediction of thixotropic cement slurry:Theory,model and example[J].J Petrol Sci Eng,2015(133):108-113.
[13]YANG Y G,YUAN B,WANG Y Q.Updated methodology for evaluating lost circulation control of cement slurry for double lost channels[J].J Petrol Sci Eng,2018(171):16-22.
[14]岳跃展,杨远光,杨生荣,等.改性乙烯醋酸乙烯酯共聚物对水泥浆性能的影响[J].油田化学,2017,34(1):16-20.
[15]黄海鸿.页岩气水平井固井水泥浆体系研究[D].成都:西南石油大学,2014.
[16]袁彬.压裂对水泥环受力及改善其力学特性材料研究[D].成都:西南石油大学,2016.
[2]钟福海,刘硕琼,徐明,等.苏桥深潜山枯竭油气藏储气库固井技术[J].钻井液与完井液,2014,31(1):64-67.
[3]ADIB S,REZA A,ABBAS Z.Cement design for underground gas storage well completion[J].J nat Gas Sci Eng,2014(18):149-154.
[4]范伟华,冯彬,刘世彬,等.相国寺储气库固井井筒密封完整性技术[J].断块油气田,2014,21(1):104-106.
[5]张幸,覃毅,李海伟,等.平顶山盐穴储气库固井技术[J].石油钻采工艺,2017,39(1):61-65.
[6]TAOUTAOU S.Avoiding sustained casing Pressure in gas wells using self healing cement[C].//The International Petroleum Technology Conference,Bangkok,Thailand,2012
[7]YANG Y G,YUAN B,SUN Q L,et al.Mechanical properties of EVA-modified cement for underground gas storage[J].J Nat Gas Sci Eng,2015(27):1846-1851.
[8]ALI M.The Use of self-healing cement to ensure long-term zonal isolation for HPHT wells subject to hydraulic gracturing opeartiong in pakistan[C].//The International Petroleum Technology Conference,Doha,Qatar,2009.
[9]杨远光,龚雨,袁彬,等.一种自愈合水泥自愈合能力的评价装置及方法:CN 104502419A[P].2015-04-08.
[10]申薛靖,刘科海,高东岳,等.微胶囊型自愈合聚合物基复合材料研究进展[J/OL].复合材料学报:1-17[2018-09-07].https://doi.org/10.13801/j.cnki.fhclxb.20180111.002.
[11]杨敏毅,曾俊杰,王胜年,等.渗透结晶材料对混凝土裂缝自愈合的影响[J].硅酸盐通报,2017,36(10):3542-3547.
[12]YUAN B,YANG Y G,TANG X,et al.A starting pressure prediction of thixotropic cement slurry:Theory,model and example[J].J Petrol Sci Eng,2015(133):108-113.
[13]YANG Y G,YUAN B,WANG Y Q.Updated methodology for evaluating lost circulation control of cement slurry for double lost channels[J].J Petrol Sci Eng,2018(171):16-22.
[14]岳跃展,杨远光,杨生荣,等.改性乙烯醋酸乙烯酯共聚物对水泥浆性能的影响[J].油田化学,2017,34(1):16-20.
[15]黄海鸿.页岩气水平井固井水泥浆体系研究[D].成都:西南石油大学,2014.
[16]袁彬.压裂对水泥环受力及改善其力学特性材料研究[D].成都:西南石油大学,2016.