A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Retarder for high-temperature stratum and preparation method thereof
The invention relates to the technical field of retarder production and processing, and discloses a retarder for a high-temperature stratum and a preparation method thereof. A DMAAPA/IA copolymer is added into cement paste, the initial consistency of the cement paste of the copolymer is reduced, the high-temperature and high-pressure thickening time is remarkably prolonged, the consistency of the cement paste is almost unchanged in the pressure and temperature rising process, the low viscosity is always maintained, thus the copolymer has good temperature resistance and pressure resistance, and can well cementation construction under the high temperature condition, and the normal hydration state of the cement particle surface is interfered due to the adsorption of the retarder so as to inhibit or partially inhibit the generation of calcium hydroxide and the growth of crystal nucleus during the cement hydration, the hydration induction period of cement is prolonged, resulting in delayed setting, and the copolymer is adsorbed on the surfaces of cement particles to inhibit the coagulation of the cement particles, and thus the hydration and structure formation of the cement are delayed, and the copolymer can also be adsorbed on the crystal surface of a new phase to further prevent the structure formation so as to play a role in retarding.
本发明涉及缓凝剂生产加工技术领域，且公开了一种用于高温地层的缓凝剂及制备方法，通过在水泥浆加入DMAAPA/IA共聚物，该共聚物的水泥浆初始稠度降低，高温高压稠化时间显著延长，在压力与温度升高过程中，水泥浆的稠度几乎不变，一直保持低稠度，因此共聚物拥有良好的抗温耐压性，能够较好地满足高温条件下的固井施工，并且由于缓凝剂的吸附，水泥颗粒表面的正常水化状态受到干扰，抑制或部分抑制了水泥水化时氢氧化钙的生成及晶核生长，使水泥的水化诱导期延长，产生了缓凝作用，该共聚物吸附于水泥颗粒表面，抑制水泥颗粒凝聚，从而延缓水泥的水化和结构形成，它也能吸附在新相的晶体表面上，进一步阻止结构形成而起缓凝作用。
Retarder for high-temperature stratum and preparation method thereof
The invention relates to the technical field of retarder production and processing, and discloses a retarder for a high-temperature stratum and a preparation method thereof. A DMAAPA/IA copolymer is added into cement paste, the initial consistency of the cement paste of the copolymer is reduced, the high-temperature and high-pressure thickening time is remarkably prolonged, the consistency of the cement paste is almost unchanged in the pressure and temperature rising process, the low viscosity is always maintained, thus the copolymer has good temperature resistance and pressure resistance, and can well cementation construction under the high temperature condition, and the normal hydration state of the cement particle surface is interfered due to the adsorption of the retarder so as to inhibit or partially inhibit the generation of calcium hydroxide and the growth of crystal nucleus during the cement hydration, the hydration induction period of cement is prolonged, resulting in delayed setting, and the copolymer is adsorbed on the surfaces of cement particles to inhibit the coagulation of the cement particles, and thus the hydration and structure formation of the cement are delayed, and the copolymer can also be adsorbed on the crystal surface of a new phase to further prevent the structure formation so as to play a role in retarding.
本发明涉及缓凝剂生产加工技术领域，且公开了一种用于高温地层的缓凝剂及制备方法，通过在水泥浆加入DMAAPA/IA共聚物，该共聚物的水泥浆初始稠度降低，高温高压稠化时间显著延长，在压力与温度升高过程中，水泥浆的稠度几乎不变，一直保持低稠度，因此共聚物拥有良好的抗温耐压性，能够较好地满足高温条件下的固井施工，并且由于缓凝剂的吸附，水泥颗粒表面的正常水化状态受到干扰，抑制或部分抑制了水泥水化时氢氧化钙的生成及晶核生长，使水泥的水化诱导期延长，产生了缓凝作用，该共聚物吸附于水泥颗粒表面，抑制水泥颗粒凝聚，从而延缓水泥的水化和结构形成，它也能吸附在新相的晶体表面上，进一步阻止结构形成而起缓凝作用。
Retarder for high-temperature stratum and preparation method thereof
一种用于高温地层的缓凝剂及制备方法
DING HAIRUI (author)
2021-09-28
Patent
Electronic Resource
Chinese
High-strength gypsum retarder and preparation method thereof
| European Patent Office | 2015
High-temperature-resistant oil well cement retarder and preparation method thereof
| European Patent Office | 2024