Feasibility Study Of Geopolymer Based Metakaolin Applied To High Temperature Cementing

As the development of carbon dioxide storage,carbon dioxide drive and ultra deep well,and heavy oil thermal recovery well,the requirements of the high temperature resistant and corrosion resistant properties of well cementing cement constantly improve.Normal Portland cement cannot meet the needs of the field.Geopolymer material has extensive sources,don't pollute the environment,but also has the high strength traditional cement don't have,high temperature resistance,corrosion resistance and other excellent performance and is increasingly concerned by people.Geopolymer have preliminary application in the construction industry,but less research in oil well cementing,so the research of high temperature cementing geopolymer consolidation system has a big significance.This paper use metakaolin,fly ash,slag,such as volcanic ash material,through the optimization of geopolymer excitation material and ratio of various mineral on consolidation system to study the influence of compressive strength,preliminary developed a geopolymer consolidation of high temperature resistance and corrosion resistance system.This paper also carried on the exploration of all the factors affecting the setting time and retarder adapted to the system,and tested the rheological properties and filtration properties of the system,which provided a guarantee for the safety construction of high temperature well cementing.Through experimental research,the optimal activator are sodium hydroxide and sodium silicate.The amount of sodium silicate is 40%to 60%,the amount of sodium hydroxide is 4%to 6%,water cement ratio is 0.7.Under the temperature below 140?,the optimization of geopolymer mineral group is divided into:metakaolin accounted for 60%of geopolymer,each of fly ash and slag accounted for 20%;Under the temperature higher than 140?,only use metakaolin to make geopolymer.This thesis durability experiment of geopolymer found that the strength of geopolymer still can maintain more than 20 MPa under the condition of high temperature 220?curing a month.Corrosion resistance research of geopolymer found that the strength remained stable under the condition of CO₂ corrosion curing 15 days.This paper tests the influence of different factors on the geopolymer setting time and has carried on the exploration to retarder.This paper selected the retarder is barium chloride,plus the amount of 5%,the setting time can reach four hours,But bad thickening performance and bad impact on the strength,is not conducive to its application Selected the dispersant is syjz-1,plus the amount of 2%,geopolymer's water loss is 32 m L in 30 minutes,can meet the requirements of cementing.