一种固井合成水泥石的研制与室内评价

对一种基于环氧树脂的合成水泥石技术进行了研究,通过研制不同密度的浆体,考察了浆体在不同温度下的可泵性、力学性能、抗污染性能、胶结强度以及清洗问题。研究结果表明,采用减轻剂(如玻璃微珠)或加重剂(如炭黑、micro Max),并配套防沉降剂,可得到密度范围为0.8~1.80 g/cm3的合成水泥石;采用不同活性芳香胺类固化剂、固化促进剂及其组合,可实现合成水泥浆在45~125℃范围内的泵送要求;合成水泥石力学性能远好于基于橡胶粉改性的弹韧性水泥石;合成水泥浆抗油基钻井液污染可达30%。另外,合成水泥浆还能明显提高油井水泥的胶结强度;使用20%的乙醇水溶液,可较容易地清洗残留在器皿上的合成水泥浆。该合成水泥石是一种非常理想的油井封隔材料。

Development and Evaluation of a Compound Set Cement for Well Cementing

Cement slurry of different densities were prepared and studied on their pumpability, mechanical properties, contamination tolerance, bonding strength and cleaning at different temperatures. Compound set cement with densities ranging from 0.8 g/cm3 to 1.80 g/cm3 can be made by adding light weight agent or weighting agent and epoxy, combined with settling preventer. Using solidifying agents such as aromatic amines of different activity, and solidification accelerator to treat cement slurry, the cement slurry can be pumped at 45-125℃. The compound set cement has mechanical property much better than that of the elastic tough set cement modified with rubber powders. The compound set cement is resistant to oil base mud contamination, and has higher bonding strength. The residue compound cement slurry can be readily cleaned with 20% alcohol.