碳纤维与胶乳液协同作用对固井水泥浆力学性能的影响
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摘要
为提高水泥石在井下抵抗外部载荷破坏的能力,需要对油井水泥材料增强增韧,碳纤维和胶乳液是油井水泥常用的改性材料。为研究碳纤维与胶乳液协同作用对水泥浆力学性能的影响,通过在水泥浆中加入不同配比的碳纤维和胶乳液,测试了水泥浆常规性能和力学性能,并使用扫描电镜对水泥石的微观结构进行观察。试验表明,相比较单掺碳纤维和单掺胶乳液的水泥石,两种材料协同作用水泥石力学性能提高。在0. 2%碳纤维和1%胶乳液加量协同作用下的水泥石抗压强度、抗折强度、抗冲击强度分别为35. 44 MPa、11. 15 MPa、2. 08 k J/m2,弹性模量达到5. 8 GPa。通过扫描电镜观察可以发现,胶乳的网状结构和碳纤维的桥接作用综合提高水泥石性能,有效的控制了水泥石微裂隙的发展,从而提高水泥石的力学性能。
In order to improve the ability of cement stone to resist the damage of external load in the underground,it is necessary to strengthen and toughen the cement material of the oil well. Carbon fiber and latex were commonly used as modified materials for oil well cement and in order to study the synergetic effect of 1 mm carbon fiber and latex on the mechanical properties of cement slurry,mechanical properties tests were carried out by adding different proportions of carbon fiber and latex in the slurry,and the electron microscopy would used to scan the internal microstructure. The tests show that compared with cement stone with single carbon fiber and single blending latex,the cement stone under the synergistic effect of 0. 2% carbon fiber and 1% latex can have high compressive strength of35. 44 MPa,high flexural strength of 11. 15 MPa,high impact strength of 2. 08 k J/m2 with low modulus of elasticity of 5. 8 GPa which shows the characteristics of elastic materials. By scanning electron microscopy observation of the microstructure of cement stone,it is found that the network structure of latex and the bridging effect of carbon fiber have not been affected and constrainted,and they can effectively control the development of micro-cracks,thereby enhancing the mechanical properties of cement stone.
In order to improve the ability of cement stone to resist the damage of external load in the underground,it is necessary to strengthen and toughen the cement material of the oil well. Carbon fiber and latex were commonly used as modified materials for oil well cement and in order to study the synergetic effect of 1 mm carbon fiber and latex on the mechanical properties of cement slurry,mechanical properties tests were carried out by adding different proportions of carbon fiber and latex in the slurry,and the electron microscopy would used to scan the internal microstructure. The tests show that compared with cement stone with single carbon fiber and single blending latex,the cement stone under the synergistic effect of 0. 2% carbon fiber and 1% latex can have high compressive strength of35. 44 MPa,high flexural strength of 11. 15 MPa,high impact strength of 2. 08 k J/m2 with low modulus of elasticity of 5. 8 GPa which shows the characteristics of elastic materials. By scanning electron microscopy observation of the microstructure of cement stone,it is found that the network structure of latex and the bridging effect of carbon fiber have not been affected and constrainted,and they can effectively control the development of micro-cracks,thereby enhancing the mechanical properties of cement stone.
引文
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[2]杨智.影响固井水泥石韧性强度的因素研究[D].成都:成都理工大学,2011.
[3]许明标,张群,王晓亮,等.微膨胀纤维增强水泥浆的性能试验研究[J].石油地质与工程,2007(2):97-99+10.
[4]谭春勤,刘伟,丁士东,等. SFP弹韧性水泥浆体系在页岩气井中的应用[J].石油钻探技术,2011,39(3):53-56.
[5]李早元,郭小阳,韩林,等.胶乳对水泥石三轴力学形变能力的作用[J].石油学报,2007(4):126-129.
[6]郭小阳,唐琪,黄成霞,等.碳酸钙晶须对油井水泥增强抗收缩机理及应用[J].钻井液与完井液,2015,32(5):66-68+105-106.
[7]李明,刘萌,杨元意,等.碳酸钙晶须与碳纤维混杂增强油井水泥石力学性能[J].石油勘探与开发,2015,42(1):94-100.
[8]张鹏,刘晨辉,李清富.聚丙烯纤维水泥稳定碎石抗弯拉弹性模量试验研究[J].公路,2010(8):185-187.
[9]高云文,刘子帅,胡富源,等.合平4致密油水平井韧性水泥浆固井技术[J].钻井液与完井液,2014,31(4):61-63.
[10] Vliet J P M van,Kleef R P A R van,Smith T R,et al. Development and field use of fibre-containing cement[C]. The 27th Annual OTC in Houston,Texas,U. S. A. 1-4 May 1995.
[11] Walter M,Marcelo A. Criado,SPE,Jorge Robles,SPE and Gustavo Bianchi/San Antonio-Pride Int Neuquen[C]. Argentina. 27-30 April 2003.
[12] Melcher J. Evaluation of strength characteristics of fibre-cement slab material[A]. Information Engineering Research Institute,USA. Proceedings of2012 International Conference on Advances in Materials Science and Engineering(AMSE 2012 V650)[C]. Information Engineering Research Institute,USA:智能信息技术应用学会,2012:6.
[13] Vajihollah A,Abbas T,Reza G,et al. Effect of composition and length of PP and polyester fibres on mechanical properties of cement based composites[J]. Construction and Building Materials,2012,36(11):534-537.
[14]步玉环,王瑞和,穆海朋,等.碳纤维改善水泥石韧性试验研究[J].石油大学学报(自然科学版),2005(3):53-56+60.
[15]尚国秀.碳纤维水泥基复合材料纤维分散性及导电性能试验研究[D].郑州:郑州大学,2015.
[16]耿国伟.固井胶乳水泥研制及性能评价[D].天津:天津科技大学,2014.
[17]王志鹏.油井水泥胶乳增韧剂的合成与性能评价[D].天津:天津大学,2014.
[18]华苏东,姚晓.油井水泥石脆性降低的途径及其作用机理[J].中国石油大学学报(自然科学版),2007(1):108-113.
[19]李明,杨雨佳,郭小阳.碳纤维增强油井水泥石的力学性能[J].复合材料学报,2015,32(3):782-788.
[20]任伟华,乔生儒,敖强. 3D-C/SiC复合材料热震损伤行为[J].材料工程,2003(12):26-28.
[21]王彦军,罗云,曹景萍.纤维水泥增强增韧实验[J].大庆石油学院学报,2005(5):28-32+123-124.
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