低温等离子体改性橡胶颗粒及其在油井水泥浆中的应用
发布时间：2019-03-16 16:12
【摘要】：为降低油井水泥石脆性,保持油井水泥环的完整性,解决油气井开采安全隐患,本文将橡胶颗粒掺入到水泥基材中。为改善橡胶颗粒表面的疏水特性,增强橡胶颗粒与水泥基体的粘结力,本文采用低温等离子体法对废旧轮胎橡胶颗粒进行了表面处理。对低温等离子体改性橡胶颗粒表面性能、改性后橡胶颗粒表面的时效性和低温等离子体接枝改性橡胶颗粒的表面特性及与水泥基体的粘结性进行了研究。本文通过接触角测试、分散性测试对低温等离子体改性橡胶颗粒表面润湿性的改变,优选出最佳改性参数。通过比表面积及孔径测试仪测试橡胶颗粒比表面积,通过红外测试橡胶颗粒表面基团变化情况,来表征低温等离子体改性对橡胶颗粒表面结构的影响。通过X射线电子能谱,测试橡胶颗粒表面元素变化,研究低温等离子体改性橡胶颗粒表面的作用机理。通过SEM观察低温等离子体改性前后橡胶颗粒的表面形貌。将低温等离子体改性后橡胶颗粒按照0-5%质量比掺入到水泥中,制成水泥浆体,考察低温等离子体改性后橡胶颗粒对水泥浆体性能的影响。将水泥浆体在30℃和90℃,分别测试养护1天、3天、7天、14天和28天水泥石的抗压强度、抗折强度和抗拉强度,考察低温等离子体改性后橡胶颗粒对水泥石力学性能的影响。测试水泥石三轴力学性能,考察低温等离子体改性后橡胶颗粒对水泥石变形能力的影响。通过SEM观察橡胶颗粒与水泥基材界面粘结情况。并将低温等离子体改性后橡胶颗粒放置1天、10天和20天,考察橡胶颗粒表面性能的变化及与水泥基材粘结性能的影响,来研究低温等离子体改性橡胶颗粒表面的时效性。通过低温等离子体汽化接枝水,来改善低温等离子体改性的时效性。结果发现,低温等离子体改性后橡胶颗粒表面润湿性明显增强,接触角降低至32.7°。比表面积增大,在3129cm-1、1625cm-1、1440cm-1、3440cm-1特征吸收带加强,所对应的是-CH2、-CH键、-C=C-键和-OH键,材料表面O/C比提高。因为低温等离子改性时,等离子体将橡胶粉表面的-C-C-、-C-H键被打断,断裂后的碳自由基可能形成-C=C-键,或者与氧等离子或原子氧反应,产生含氧极性基团-C-O-键或-C=O键,使得橡胶颗粒表面的亲水性得到改善。将改性后橡胶颗粒掺入到水泥浆体中,发现低温等离子改性橡胶颗粒能有效改善水泥石抗压强度的衰退,提高抗折强度和抗拉强度,降低弹性模量,增大水泥石变形能力。受低温等离子体改性时效性影响,橡胶颗粒表面性能均略有降低,但仍优于未处理橡胶颗粒。通过低温等离子体汽化接枝水来改善低温等离子体改性的时效性,接枝改性后的橡胶颗粒表面性能较好,与水泥基材粘结紧密。
[Abstract]:In order to reduce the brittleness of oil well cement stone, keep the integrity of oil well cement sheath and solve the hidden trouble of oil and gas well production safety, rubber particles were mixed into cement substrate in this paper. In order to improve the hydrophobic properties of rubber particles and enhance the adhesion between rubber particles and cement matrix, the surface treatment of waste tire rubber particles was carried out by low temperature plasma method. The surface properties of rubber particles modified by low-temperature plasma, the time-effect of modified rubber particles, the surface characteristics of rubber particles modified by low-temperature plasma grafting and the adhesion between rubber particles and cement matrix were studied. In this paper, the surface wettability of rubber particles modified by low temperature plasma was changed by contact angle test and dispersion test, and the optimum modification parameters were optimized. The effect of low temperature plasma modification on the surface structure of rubber particles was characterized by measuring the specific surface area and pore size of rubber particles by measuring the specific surface area of rubber particles and the change of the surface groups of rubber particles by infrared spectroscopy. The surface element changes of rubber particles were measured by X-ray electron spectroscopy, and the mechanism of modification of rubber particles surface by low temperature plasma was studied. The surface morphology of rubber particles before and after low temperature plasma modification was observed by SEM. The rubber particles modified by low-temperature plasma were added into cement according to the mass ratio of 0% to 5%. The effect of rubber particles modified by low-temperature plasma on the properties of cement paste was investigated. The compressive strength, flexural strength and tensile strength of cement paste were measured at 30 鈩，
本文编号：2441711
[Abstract]:In order to reduce the brittleness of oil well cement stone, keep the integrity of oil well cement sheath and solve the hidden trouble of oil and gas well production safety, rubber particles were mixed into cement substrate in this paper. In order to improve the hydrophobic properties of rubber particles and enhance the adhesion between rubber particles and cement matrix, the surface treatment of waste tire rubber particles was carried out by low temperature plasma method. The surface properties of rubber particles modified by low-temperature plasma, the time-effect of modified rubber particles, the surface characteristics of rubber particles modified by low-temperature plasma grafting and the adhesion between rubber particles and cement matrix were studied. In this paper, the surface wettability of rubber particles modified by low temperature plasma was changed by contact angle test and dispersion test, and the optimum modification parameters were optimized. The effect of low temperature plasma modification on the surface structure of rubber particles was characterized by measuring the specific surface area and pore size of rubber particles by measuring the specific surface area of rubber particles and the change of the surface groups of rubber particles by infrared spectroscopy. The surface element changes of rubber particles were measured by X-ray electron spectroscopy, and the mechanism of modification of rubber particles surface by low temperature plasma was studied. The surface morphology of rubber particles before and after low temperature plasma modification was observed by SEM. The rubber particles modified by low-temperature plasma were added into cement according to the mass ratio of 0% to 5%. The effect of rubber particles modified by low-temperature plasma on the properties of cement paste was investigated. The compressive strength, flexural strength and tensile strength of cement paste were measured at 30 鈩，
本文编号：2441711
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