Study on Thermally Viscosifying Copolymer as a High Temperature Stabilizer for High Density Cement Slurries
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摘要: 针对水泥浆高温沉降失稳问题，设计开发了一种基于热增黏共聚物的高温高密度水泥浆稳定剂。首先，合成了一种热增黏共聚物，共聚物中引入新型疏水单体，测试了热增黏共聚物溶液不同温度下的流变性能，探索了其热增黏机理。热增黏共聚物溶液表观黏度随着温度的升高逐渐增加，115～125 ℃时达到最大值，温度持续升高，表观黏度略有降低，但150 ℃表观黏度仍可维持在初始表观黏度的2～4倍，表现出良好的热增黏效果。基于合成的热增黏共聚物，与助剂复配，制备了高温高密度水泥浆悬浮稳定剂，评价了稳定剂对高密度水泥浆沉降稳定性的影响，和加有稳定剂的高密度水泥浆流变性能、失水量、游离液、稠化性能和抗压强度等综合性能。实验结果显示，2.50 g/cm3高密度水泥浆中加入1%稳定剂后，150 ℃水泥浆密度差由0.58 g/cm3降低至0.07 g/cm3，水泥石密度差降到0.08 g/cm3以下，水泥浆高温变稀现象得到抑制，稳定性显著改善。加入稳定剂后，高密度水泥浆失水量及游离液降低，对水泥浆稠化时间、流变性能及抗压强度影响小，综合性能能够满足现场施工需求。Abstract: To dela with the loss of settling stability of cement slurries at elevated temperatures, a high temperature high density cement slurry stabilizer based on a thermally viscosifying copolymer was developed. A new hydrophobic monomer was introduced into the molecule of the thermally viscosifying copolymer. To understand the thermal viscosification mechanisms of this copolymer, the rheology of the copolymer solution was tested at different temperatures. The apparent viscosity of the copolymer solution increases with temperature, and reaches its maximum value at 115-125 ℃. Continued increasing the temperature, the apparent viscosity of the copolymer solution was slightly decreasing, however, the apparent viscosity of the solution at 150 ℃ was still two to four times the apparent viscosity of the solution at the beginning of the test, indicating that the copolymer has good thermally viscosifying effect. A high temperature suspending stabilizer for high density cement slurries was developed with this copolymer and other additives. In laboratory experiment, the effects of the stabilizer on the settling stability of cement slurries were evaluated, the rheology, filter loss, free water content, thickening performance as well as compressive strength of the cement slurry containing the stabilizer were measured. The experimental results showed that a 2.5 g/cm3 cement slurry treated with 1% stabilizer had its differential density at 150 ℃ reduced from 0.58 g/cm3 to 0.07 g/cm3, and the differential density of the corresponding set cement reduced to less than 0.08 g/cm3. The thinning effect of the cement slurry at elevated temperatures was mitigated and the stability of the cement slurry was significantly improved. After treatment with the stabilizer, the high density cement slurry had low filter loss and free water content, and the stabilizer had only minor effect on the thickening time, rheology and compressive strength of the cement slurry. The overall properties of the cement slurry treated with the stabilizer have satisfied the needs of field operations.
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