Impact Resistance Mechanical Properties and Damage Characteristics of Set Cement Containing Nitril Rubber Powders
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摘要: 油井水泥是一种典型的脆性材料，提高水泥环韧性和降低水泥环脆性是目前的研究热点，在保证油气井安全生产的前提下还能延长油气井使用寿命。该研究将球形丁腈橡胶颗粒(Microsphere nitrile Rubber Powder，MRP)与不规则丁腈橡胶颗粒(Nitrile Rubber Powder，NRP)分别加入到油井水泥中，探讨其抗冲击力学性能与损伤特征。采用直径为50 mm的分离式霍普金森压杆(Split Hopkinson Pressure Bar-SHPB)设备测试了不同体系水泥石的动态抗冲击性能，讨论了动态抗压强度、能量演化、损伤特征的变化规律。球形丁腈橡胶颗粒加量为6%的油井水泥石试样动态抗压强度可达（64.0±1.6） MPa，试样吸收能为39.93 J，吸能率可达49.91%；不规则丁腈橡胶颗粒加量为6%的油井水泥石试样动态抗压强度为（74.1±1.8） MPa，试样吸收能为46.56 J，吸能率可达58.20%。通过高速摄影和微观形貌发现，不规则丁腈橡胶颗粒与水泥基体间结合更加紧密，通过裂纹偏转机制提高阻裂能力，利于延长试样承载时间，加大载荷能量的消耗。Abstract: Oil well cement is a typical brittle material, presently many studies are focused on improving the toughness and reducing the brittleness of the cement sheath, as well as prolonging the service life of an oil/a gas well without impairing the safety of the well. In this study, the microsphere nitrile rubber powder (MRP) and the irregular nitrile rubber powder (NRP) were separately added to cement slurry to investigate the mechanical performance of impact resistance and the damage characteristics of the set cement. Using a split Hopkinson pressure bar (SHPB) with a diameter of 50 mm, the dynamic impact resistance performance of different set cement samples was tested. The dynamic compressive strength, energy evolution and damage characteristics of the set cement samples were discussed using the test results. A set cement sample containing 6% MRP had dynamic compressive strength of 64.02 MPa, and the absorbed energy of the sample was 39.93 J, equivalent to an absorbed energy rate of 49.91%. Another set cement sample containing 6% NRP had dynamic compressive strength of 74.06 MPa, and the absorbed energy of the sample was 46.56 J, equivalent to an absorbed energy rate of 58.20%. It was found from high-speed photographing and micromorphology observation that NRP is more closely bonded with the set cement matrix, and the crack resistance of the set cement was improved through crack deflection mechanism, which is beneficial to prolonging the load bearing time of the sample and increasing the consumption of the load energy.
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表 1 不同水泥石试样SHPB测试能量特征数据
试样
编号入射能/
J反射能/
J透射能/
J吸收能/
J吸能率/
%峰值强度/
MPaControl 80 36.32 35.94 7.74 9. 68 19.3±1.5 MRP-2% 80 31.08 20.70 28.22 35.28 42.1±2.7 MRP-4% 80 29.50 18.45 32.05 40.06 53.7±2.0 MRP-6% 80 26.39 13.68 39.93 49.91 64.0±1.6 MRP-8% 80 28.92 16.84 34.24 42.80 57.5±2.0 NRP-2% 80 29.02 23.64 27.34 34.18 46.0±2.5 NRP-4% 80 26.95 13.07 39.98 49.98 63.7±2.0 NRP-6% 80 24.49 8.95 46.56 58.20 74.1±1.8 NRP-8% 80 26.17 11.58 42.25 52.81 66.6±2.1 
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