钻井液与完井液2023，Vol.40Issue(5)：629-636,8.DOI:10.12358/j.issn.1001-5620.2023.05.012
ATP负载杂环两性共聚物型超高温降失水剂的合成与性能评价
The Synthesis of ATP Loaded Heterocyclic Amphoteric Copolymer and Its Performance and Mechanisms of Reducing Filtration Rate under Ultra-High Temperatures
摘要
Abstract
The AMPS copolymer filter loss reducers have obvious thinning effect which is detrimental to the ultra-high temperature settling stability cement slurries.To solve this problem,an ultra-high temperature cement slurry filter loss reducer ATP-FLA is developed for use at elevated temperatures to weaken the high temperature dispersion side-effect of pure copolymers.ATP-FLA is synthesized as an attapulgite(ATP)loaded heterocyclic amphoteric copolymer.Comparison of the copolymer with and without ATP loading shows that in a temperature range of 150-240℃,a cement slurry treated with 4.0%-6.0%ATP-FLA and 2.0%-4.0%suspending agent has API filtration rate of less than 40 mL and density difference from settlement of the cement slurry of not greater than 0.03 g/cm3.After aging at 240℃and 120 MPa,the cement slurry has flow index of 0.897,6 as well as high thickness and shear resistance at high temperatures.To evaluate the compatibility of the filter loss reducer ATP-FLA,ultra-high temperature cement slurry samples were taken from several wellsites.The evaluation test results show that the ATP-FLA can control the filtration rate without affecting the other properties of the cement slurries.Study on the working mechanisms of ATP-FLA using molecular dynamics shows that ATP-FLA has advantages over conventional ionic copolymers in that the disturbances to the molecular chains of ATP-FLA from the"dehydration"effect of metal ions in the environment are weakened,and the ATP-FLA molecules are therefore resistant to the attack of the metal ions,and this is why,on the basis of mechanisms,the ATP-FLA filter loss reducer is more adaptable to the metal ion environment prevailing in cement slurries.关键词
超高温固井降失水剂/超高温沉降稳定性/凹凸棒土/杂环两性共聚物/分子动力学模拟Key words
Ultra-high temperature cement slurry filter loss reducer/Ultra-high temperature settling stability/Attapulgite/Heterocyclic amphoteric copolymer/Molecular dynamics simulation分类
能源科技引用本文复制引用
王其可,刘文明,凌勇,许艺馨,张航,段云刚,郭锦棠..ATP负载杂环两性共聚物型超高温降失水剂的合成与性能评价[J].钻井液与完井液,2023,40(5):629-636,8.基金项目
渤海钻探博士创新基金项目"抗温240℃油井水泥降失水剂、缓凝剂分子结构设计及合成工艺研究"(2022BC72F). （2022BC72F）
