粉煤灰-矿渣地质聚合物套管浮鞋芯体材料的室内研究
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摘要
利用地质聚合物快硬早强且胶结性能优异的特性,以期代替水泥基材料,制备粉煤灰-矿渣二元体系地质聚合物套管浮鞋芯体材料。对比研究了地质聚合物与水泥芯材的基本物理性能,分析了芯材与浮鞋外壳及回压阀壳体间的胶结强度,并采用压汞孔隙率分析仪(MIP)及岩芯流动仪表征地质聚合物的孔隙率及渗透率。结果表明:地质聚合物浆体在低温(5℃)条件下的凝结时间短且早期强度高,1 d抗压强度为10. 8 MPa,比G级油井水泥石提高了18. 7%;与钢制浮鞋外壳和铸铁回压阀壳体的3 d胶结强度分别为2. 43 MPa和0. 89 MPa,相比于油井水泥石分别提高了40. 5%和50. 8%;总孔隙率为16. 1%,比油井水泥石降低了9. 5%; 20 MPa下渗透率为1. 39×10~(-5)μm~2,比油井水泥石渗透率小4个数量级。地质聚合物芯材既实现了低温环境下无需养护的快速成型脱模工艺,又可改善浮鞋的承压密封作用,为其在特种浇注材料领域开辟新的应用方向。
The fly ash-slag geopolymer with high early strength and excellent bonding performance was prepared as alternatives to Portland cements as core material for casing float shoe. This work investigated the physical properties of the geopolymers,and the bonding strengths between the pastes and steel float shoe shell and cast iron back pressure valve shell. The porosity and permeability of the geopolymer were characterized by mercury intrusion porosimetry( MIP) and core permeameter. The results show that 1 d compressive strength of the geopolymers cured at 5 ℃ is 10. 8 MPa,which increases by 18. 7% compared with the cement paste. The 3 d bonding strengths between geopolymer and steel float shoe shell and cast iron back pressure valve shell are 2. 43 MPa and 0. 89 MPa,respectively. These values increase by 40. 5%and 50. 8% compared with the cement paste. The porosity of geopolymer is 16. 1%,which decreases by9. 5% compared with the cement paste. The permeability of geopolymer under 20 MPa displacement pressure is 1. 39 × 10~(-5)μm~2,which decreases by four orders of magnitude compared with the cement paste. As core material for casing float shoe,geopolymers cured under low temperature exhibit the rapid strength development,good pressure-bearing and sealing properties. This work shows the feasibility of using geopolymers as the special type of casting material.
The fly ash-slag geopolymer with high early strength and excellent bonding performance was prepared as alternatives to Portland cements as core material for casing float shoe. This work investigated the physical properties of the geopolymers,and the bonding strengths between the pastes and steel float shoe shell and cast iron back pressure valve shell. The porosity and permeability of the geopolymer were characterized by mercury intrusion porosimetry( MIP) and core permeameter. The results show that 1 d compressive strength of the geopolymers cured at 5 ℃ is 10. 8 MPa,which increases by 18. 7% compared with the cement paste. The 3 d bonding strengths between geopolymer and steel float shoe shell and cast iron back pressure valve shell are 2. 43 MPa and 0. 89 MPa,respectively. These values increase by 40. 5%and 50. 8% compared with the cement paste. The porosity of geopolymer is 16. 1%,which decreases by9. 5% compared with the cement paste. The permeability of geopolymer under 20 MPa displacement pressure is 1. 39 × 10~(-5)μm~2,which decreases by four orders of magnitude compared with the cement paste. As core material for casing float shoe,geopolymers cured under low temperature exhibit the rapid strength development,good pressure-bearing and sealing properties. This work shows the feasibility of using geopolymers as the special type of casting material.
引文
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[13]杨涛,姚晓,诸华军.矿渣掺量对碱激发粉煤灰-矿渣反应过程及产物组成的影响[J].南京工业大学学报,2015,37:19-26.
[2]张明昌.固井工艺技术[M].北京:中国石化出版社,2007.
[3]姜向东,朱和明,孙文俊.易钻浮箍浮鞋的研制及应用[J].石油钻采工艺,2012,34:107-110.
[4]刘运楼,李福德,刘伟.浮箍井下工作环境与失效分析[J].天然气工业,2006,26:94-97.
[5]张洪新,程建中.稠油油藏水平井套管附件的研制及应用[J].钻采工业,1998,32:58-61.
[6]姜伟.现代综合配套快速钻井技术在渤海的运用[J].天然气工业,1998,18:40-44.
[7]朱和明,吴晋霞,郭朝辉,等.浮箍和浮鞋失效原因分析及预防[J].石油矿场机械,2013,42:66-71.
[8] Rickard W D A,Williams R,Temuujin J,et al. Assessing the suitability of three Australian fly ashes as an aluminosilicate source for geopolymers in high temperature applications[J]. Mater. Sci. Eng. A,2011,528:3390-3397.
[9] Kumar S,Kumar R,Mehrotra S P. Influence of granulated blast furnace slag on the reaction,structure and properties of fly ash based geopolymer[J]. J. Mater. Sci.,2010,45:607-615.
[10] Onisei S,Pontikes Y,Van Gerven T,et al. Synthesis of inorganic polymers using fly ash and primary lead slag[J]. J. Hazard. Mater.,2012,205-206:101-110.
[11] Komnitsas K,Zaharaki D,Perdikatsis V. Geopolymerisation of low calcium ferronickel slags[J]. J. Mater. Sci.,2007,42:3073-3082.
[12] Maragkos I,Giannopoulou I P,Panias D. Synthesis of ferronickel slag-based geopolymers[J]. Miner. Eng.,2009,22:196-203.
[13]杨涛,姚晓,诸华军.矿渣掺量对碱激发粉煤灰-矿渣反应过程及产物组成的影响[J].南京工业大学学报,2015,37:19-26.