低温等离子体改性岩沥青对油井水泥石力学性能的影响

发布时间：2018-04-22 17:10

本文选题：岩沥青 + 低温等离子体　；参考：《西南石油大学》2017年硕士论文

【摘要】：针对油井水泥环易脆裂,抗冲击能力差的问题,本文拟将具有粘弹性的岩沥青颗粒掺入油井水泥浆中来改善油井水泥石的力学性能。但是,岩沥青是一种难以分散于油井水泥浆内的憎水物质,而且其对油井水泥石性能的影响会随着温度的改变而改变。因此,本文首先使用低温等离子体技术来改善岩沥青颗粒表面的憎水性,然后探究在不同的养护温度下改性岩沥青对油井水泥石的力学性能的影响。通过红外光谱分析和接触角测试分别探讨了等离子体处理时间、等离子体处理功率和氧气气体流量对低温等离子体改性前后岩沥青颗粒表面基团和表面润湿性的影响。然后研究0-4%掺量的改性岩沥青对油井水泥浆浆体性能的影响。再研究不同养护温度(30℃、60℃和90℃)下改性岩沥青对油井水泥石力学强度的影响。通过测试纯油井水泥石和掺有4%改性岩沥青的油井水泥石在30℃、60℃和90℃下杨氏模量和泊松比的发展变化,研究改性岩沥青对油井水泥石形变能力的影响。通过对纯油井水泥石试样和掺有4%改性岩沥青的油井水泥石试样进行X射线衍射分析、红外光谱分析和热重分析来探究改性岩沥青对油井水泥水化程度的影响。通过扫描电子显微镜观察改性岩沥青颗粒与油井水泥水化产物的界面粘结情况以及改性岩沥青对裂纹发展的影响。改性结果表明:经低温等离子体改性后岩沥青表面生成的磺酸基团(-SO3H)使岩沥青的憎水性得到明显改善。当处理时间、处理功率和氧气气体流量分别为3分钟、100W和40Sccm时改性效果较佳,岩沥青与水的接触角由107°降低至32.48°。改性岩沥青对油井水泥石抗压强度的影响结果表明:改性岩沥青的加入降低了油井水泥石的抗压强度。掺有4%改性岩沥青的油井水泥石在30℃、60℃和90℃下养护28天的抗压强度较纯油井水泥石分别降低了 11.65%、12.35%和13%。改性岩沥青对油井水泥石抗拉强度的影响结果表明:改性岩沥青对油井水泥石抗拉强度的影响因温度的不同而不同。掺有4%改性岩沥青的油井水泥石分别在30℃和60℃下养护28天的抗拉强度较纯油井水泥石分别降低了 26.3%和24.8%,在90℃下改性岩沥青掺量为4%的油井水泥石的抗拉强度较纯油井水泥石提高了 33.1%。改性岩沥青对油井水泥石形变能力的影响结果表明:改性岩沥青对油井水泥石形变能力的影响因温度的不同而不同。掺有4%改性岩沥青的油井水泥石分别在30℃和60℃下养护7天的泊松比较纯油井水泥石分别降低了 7.69%和3.73%,7天杨氏模量较纯油井水泥石分别提高了 10%和8%;在90℃下改性岩沥青掺量为4%的油井水泥石7天的泊松比较纯水泥石提高了 7.14%,7天杨氏模量较纯水泥石降低了 7.3%。改性岩沥青对油井水泥水化程度的影响结果表明:改性岩沥青的加入延缓了油井水泥的水化。微观结构分析表明:改性岩沥青颗粒与油井水泥水化产物胶结良好。在30℃和60℃下,改性岩沥青的加入不利于提高油井水泥石的形变能力;在90℃下,改性岩沥青的加入有利于提高油井水泥石的形变能力。
[Abstract]:In view of the brittle crack and poor impact resistance of the oil well cement ring, this paper intends to mix the viscoelastic bitumen particles into the oil well cement slurry to improve the mechanical properties of the oil well cement. However, the rock bitumen is a kind of hydrophobic material which is difficult to disperse in the oil well cement slurry, and its effect on the performance of the oil well cement stone will be with the temperature. Therefore, this paper first uses low temperature plasma technology to improve the hydrophobicity of the surface of rock asphalt particles, and then explores the effect of the modified rock bitumen on the mechanical properties of the oil well cement rock at different curing temperatures. The plasma treatment time and plasma are discussed by infrared spectrum analysis and contact angle test. The effect of body treatment power and oxygen gas flow on the surface groups and surface wettability of rock bitumen before and after plasma modification at low temperature. Then the effect of Modified Rock bitumen with 0-4% content on the performance of oil well cement slurry is studied. The mechanical strength of Modified Rock bitumen under different curing temperatures (30, 60 and 90 C) is studied. By testing the development and change of the young's modulus and Poisson's ratio at 30, 60 and 90, the influence of the modified rock asphalt on the deformation capacity of the oil well cement stone by testing the cement stone of pure oil well cement and 4% Modified Rock bitumen. The effect of Modified Rock Asphalt on the hydration degree of oil well cement was investigated by X ray diffraction analysis, infrared spectrum analysis and thermogravimetric analysis. The interfacial bond between the modified rock asphalt particles and the hydration products of oil well cement and the effect of Modified Rock Asphalt on the crack development were investigated by scanning electron microscope. The results showed that the modified rock bitumen had the effect of low temperature and so on. The sulfonic group (-SO3H) generated by the surface of the modified bitumen on the surface of the bitumen made the bitumen hydrophobicity improved obviously. When treatment time, the treatment power and oxygen gas flow rate are 3 minutes respectively, the modified effect of 100W and 40Sccm is better, the contact angle of rock bitumen and water is reduced from 107 degrees to 32.48 degrees. The compressive strength of modified rock asphalt to oil well cement stone The results show that the addition of Modified Rock Asphalt reduces the compressive strength of the oil well cement stone. The compressive strength of the oil well cement stone with 4% Modified Rock bitumen at 30, 60 and 90 C reduces 11.65%, 12.35% and 13%. modified rock asphalt to the tensile strength of the oil well cement stone, respectively. The effect of the modified rock asphalt on the tensile strength of the oil well cement stone varies with the temperature. The tensile strength of the oil well cement mixed with 4% Modified Rock bitumen at 30 and 60 degrees centigrade is 26.3% and 24.8% lower than the pure oil well cement stone respectively. The tensile strength of the oil well cement stone with the modified rock asphalt content of 4% at 90 centigrade. The results of the effect of 33.1%. modified rock asphalt on the deformation capacity of oil well cement stone show that the effect of Modified Rock Asphalt on the deformation capacity of oil well cement stone varies with temperature. The oil well cement stone with 4% Modified Rock bitumen at 30 and 60 centigrade for 7 days is compared with pure oil well cement. Don't reduce 7.69% and 3.73%, and the young's modulus of the 7 days is 10% and 8% higher than that of the pure oil well cement stone. At 90 C, the cement stone with the modified rock asphalt content of 4% is 7.14% in 7 days, and the young's modulus is less than that of the pure cement. The effect of the 7.3%. modified rock asphalt on the hydration degree of the oil well cement is reduced in 7 days. The addition of Modified Rock Asphalt postponed the hydration of oil well cement. The microstructure analysis showed that the modified rock bitumen particles were cemented well with the hydration products of oil well cement. At 30 and 60 C, the addition of Modified Rock bitumen was not conducive to the improvement of the deformation ability of the oil well cement. The addition of Modified Rock bitumen at 90 C was beneficial to the improvement of oil well cement. The deformation capacity of stone.

【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ172.75

【参考文献】