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针对射孔和增产措施使油井水泥环产生脆性破坏,带来层间流体窜流和套损率上升等难题,开发了一种新型增韧剂HD[合成橡胶粉H的质量分数(下同)w=5.5%;特种化纤D的w=0.2%]。评价了掺HD水泥石的力学性能和微观结构及水泥浆的工程性能。结果表明:掺HD油井水泥石的韧性和弹性均被显著提高,抗冲击功提高了198%～222%,Young模量降低了38%～40%;掺HD(w=5.7%),减阻剂USZ(w=0.2%),降滤失剂F17B(w=1.2%)和晶体膨胀剂F17A(w=3%)水泥浆综合性能满足固井施工的基本要求。对不同水泥环中应力波传播速率的计算和模拟射孔实验表明:水泥石弹性模量的降低有利于韧性的提高。
In view of the problems of perforation and stimulation measures, such as brittle failure of oil well cementing ring, cross-flow of fluid and increase of casing damage rate, a new type of toughening agent HD [mass fraction of synthetic rubber powder H w = 5.5%; specialty fiber D w = 0.2%]. The mechanical properties and microstructure of HD cement admixture and engineering properties of cement slurry were evaluated. The results show that the toughness and elasticity of cement admixture with HD are significantly increased, the impact energy increased by 198% -222% and the Young modulus decreased by 38% -40%. HD (w = 5.7%), The comprehensive performance of USZ (w = 0.2%), fluid loss additive F17B (w = 1.2%) and crystal expansion agent F17A (w = 3%) grout meet the basic requirements of cementing construction. The calculation of stress wave propagation velocity in different cement rings and the simulation of perforation experiments show that the decrease of the elastic modulus of cement stone is beneficial to the improvement of toughness.