Synthesis and performance evaluation of novel high-temperature-resistant fluid loss additive for oil wells

doi:10.7623/syxb201605011

Acta Petrolei Sinica ›› 2016, Vol. 37 ›› Issue (5): 672-679.DOI: 10.7623/syxb201605011

• Petroleum Engineering • Previous Articles Next Articles

Synthesis and performance evaluation of novel high-temperature-resistant fluid loss additive for oil wells

Yan Siming, Yang Shen, Wang Fuhui, Wang Yongji, Wu Yanan, Yan Shengdong

School of Chemical Engineering and Technology, Southwest Petroleum University, Sichuan Chengdu 610500, China

Received:2015-11-18 Revised:2016-03-22 Online:2016-05-25 Published:2016-06-06

新型耐高温油井降失水剂的合成与性能评价

严思明, 杨珅, 王富辉, 王永吉, 吴亚楠, 严圣东

西南石油大学化学化工学院四川成都 610500

通讯作者: 严思明,男,1963年5月生,1988年获四川大学放射化学专业学士学位,2012年获西南石油大学油气井工程专业博士学位,现为西南石油大学化学化工学院教授,主要从事油田化学方面的教学和研究工作。Email:yansm843@163.com
作者简介:严思明,男,1963年5月生,1988年获四川大学放射化学专业学士学位,2012年获西南石油大学油气井工程专业博士学位,现为西南石油大学化学化工学院教授,主要从事油田化学方面的教学和研究工作。Email:yansm843@163.com
基金资助:
中国石油化工股份有限公司西北油田分公司项目"顺南地区高压气井固井技术优化研究"(34400000-15-ZC0607-0003)资助。

Abstract

Abstract:

By taking acrylamide (AM), acrylic acid (AA) and a sulfonic monomer (TS) with special structure were as materials, and ammonium persulfate as an initiator, a novel high-temperature-resistant fluid loss additive (FR) for oil wells is synthesized in this study. The structure and thermostability of FR are characterized using infrared spectrum, nuclear magnetic resonance and thermogravimetric analysis, so as to evaluate the fluid loss, temperature resistance, salt tolerance, thickening time and other engineering performances of the cement slurry with FR. The results show that acrylamide (AM), acrylic acid (AA) and sulfonic monomer (TS) are effectively polymerized to the fluid loss reducer FR; FR has good fluid loss control ability and high-temperature resistance ability, and can be used in the temperature range of 90-200℃. When the temperature is 200℃ and FR mass fraction is 1.0%, the fluid loss of cement slurry is 48 mL, indicating excellent ability to resistant water loss. In the 25% NaCl salt-water cement slurry system, the fluid loss is 24 mL, proving a good salt resistance performance. Moreover, FR shows good applicability to different brands of cement and multiple oil well cement additives with little impact on the rheological property of the cement slurry and compressive strength of the cement stone. Then the mechanism of viscoelasticity adsorption layer theory regarding FR is studied based on chemical analysis, SEM and other means. The macromolecules are adsorbed to positively charged cement particles by charge effect, thus forming a compressible viscoelasticity adsorption layer. Under the pressure difference function of fluid loss, the adsorption layer is compressed to fill the interspace of cement particles, so as to block the fluid loss channel effectively and stably as well as reduce the permeability of filter cake. This theory can give a rational explanation to the mechanism of fluid loss additives through adsorption and viscosity increasing.

Key words: well cementation, cement slurry, fluid loss additive, high-temperature resistance, salt tolerance, viscoelasticity adsorption layer

摘要：

以丙烯酰胺(AM)、丙烯酸(AA)和一种具有特殊结构的磺酸基单体(TS)为原料,过硫酸氨为引发剂,合成了新型抗高温抗盐油井水泥降失水剂FR。利用红外光谱、核磁共振、热重分析表征降失水剂FR的结构及热稳定性,评价了含降失水剂FR的水泥浆的降失水性能、抗温性能、抗盐性能、稠化时间等工程性能。结果表明:丙烯酰胺(AM)、丙烯酸(AA)和磺酸基单体(TS)有效聚合到降失水剂FR中;该降失水剂耐温性能和控制失水性能良好,可在90~200℃内使用,当温度为200℃、FR质量分数为1.0%时,水泥浆体系失水量为48 mL;降失水剂FR耐盐性能良好,可在含有25% NaCl的水泥浆体系中使用,并控制其失水量为24 mL;降失水剂FR适应性良好,可应用于不同品牌的水泥中,对水泥浆流变性、水泥石抗压强度等无不良影响。采用化学分析、扫描电镜等手段研究了降失水剂FR的黏弹性吸附层理论的作用机理:高分子通过电荷作用吸附到带正电的水泥颗粒上,形成一层可压缩的黏弹性吸附层,在失水的压差作用下,吸附层被挤压并填充到水泥颗粒间的空隙中,从而有效、牢固地堵塞了失水通道、降低了滤饼渗透率。该理论能合理解释吸附增黏类降失水剂的作用机理。

关键词: 固井, 水泥浆, 降失水剂, 抗高温, 抗盐, 黏弹性吸附层

CLC Number:

TE256

Yan Siming, Yang Shen, Wang Fuhui, Wang Yongji, Wu Yanan, Yan Shengdong. Synthesis and performance evaluation of novel high-temperature-resistant fluid loss additive for oil wells[J]. Acta Petrolei Sinica, 2016, 37(5): 672-679.

严思明, 杨珅, 王富辉, 王永吉, 吴亚楠, 严圣东. 新型耐高温油井降失水剂的合成与性能评价[J]. 石油学报, 2016, 37(5): 672-679.

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Synthesis and performance evaluation of novel high-temperature-resistant fluid loss additive for oil wells

新型耐高温油井降失水剂的合成与性能评价

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