固井用遇油自修复材料的研制与性能评价

Cementing in Oil Self-healing Materials Development And Performance Evaluation

采用悬浮聚合法,以甲基丙烯酸十二烷基酯(LMA)、苯乙烯(St)、甲基丙烯酸羟乙酯(HEMA)为聚合单体,过氧化苯甲酰(BPO)为引发剂,聚乙烯醇(PVA)为分散剂,二乙烯基苯(DVB)为交联剂,合成了一种树脂并应用到固井水泥石中。通过正交实验考察了单体、分散剂、引发剂、交联剂、温度对三元共聚树脂吸油性能的影响。结果表明:当m(LMA)∶m(St)∶m(HEMA)=6∶3∶1、w(PVA)=2.5%(以单体的总质量为基准,下同)、w(BPO)=1.0%、w(DVB)=0.5%、t=85℃时,三元共聚树脂的吸油性能最佳,二甲苯的吸油率达12.78 g/g。通过人工造缝,对加入树脂水泥石的渗透率和抗压强度进行了考察,结果表明:在25℃下,养护30 d后,水泥石渗透率随树脂的增加而降低,在w(树脂)=8.0%(以水泥质量为基准,下同)时低至2.50×10^(-4)μm^2,而抗压强度随树脂的增加先增加后减小,在w(树脂)=2.0%时达到最大值20.8 MPa,抗压强度恢复率达70.5%。

A resin was synthesized by suspension polymerization and applied to cementing cement.Lauryl methacrylate（ LMA）,styrene（ St）,hydroxyl ethyl methacrylate（ HEMA） as the co-monomer,benzoyl peroxide（ BPO） as initiator,polyvinyl alcohol（ PVA） as dispersant,divinyl benzene（ DVB）as crosslinking agent. Using orthogonal experimental method to research the monomer ratio,the dosage of dispersants,dosage of initiator,crosslinking agent and reaction temperature on the properties of the ternary copolymer resin oil absorption effect. The results showed the optimum polymerization condition of the ternary copolymer are as follows： m（ LMA） ∶ m（ St） ∶ m（ HEMA） = 6 ∶ 3 ∶ 1、w（ PVA） = 2. 5% 、w（ BPO） = 1. 0% 、w（ DVB） = 0. 5% 、t = 85 ℃,and the oil absorption rate of xylene was 12. 78 g/g.Through the artificial joint,The resin was added to the slurry system and discussed the variation of cement compressive strength and permeability. The results showed that after curing 30 days at 25 ℃,the permeability decreased with the increase of resin,reduced to 2. 50 × 10^-4μm2at w（ resin） = 8. 0%（ based on mass of cement,the same below）,while the compressive strength increased with resin increases and then decreased,reacheed the maximum value of 20. 8 MPa at w（ resin） = 2. 0%,and the compressive strength of the recovery rate was 70. 5%.