In order to study the cement slurry system suitable for low-pressure leaky formation and containing CO2 corrosive gas in oil and gas wells,low-density preservative C-JX52 was prepared,and a high-temperature and low-density CO2 corrosion-resistant cement slurry system was constructed to evaluate the performance of the cement slurry system.The experimental results show that the rheological properties,water loss and thickening time of the low-density anticorrosive cement slurry meet the requirements of site construction.The compressive strength of 24 h is greater than 14 MPa.Under the conditions of 150℃and CO2 partial pressure of 20 MPa,the corrosion depth of 30 d is less than 2 mm,the compressive strength decay rate is less than 15%,and the permeability increase rate is less than 25%.
关键词
高温/低密度/防腐/水泥浆/固井
Key words
high temperature/low-density/anti-corrosion/cement slurry/cementing
万方数据