生物碳化固化水基钻屑作用机理及力学性能研究

Mechanism and Mechanical Properties of Water⁃based Drilling Cuttings Solidified by Bio⁃carbonization

钻屑作为油气勘探开发中形成的固废,主要通过水泥进行固化,但水泥生产过程中会形成大量的二氧化碳。因此,需要研究高效、环保的钻屑固化处理方法。生物碳化作为新型松散颗粒加固方法,为钻屑固化处理提供了新思路。生物碳化固化水基钻屑试验表明:固化体强度随含水率、尿素浓度的增加而减小,随活性氧化镁浓度、养护时间的增加而增加。利用相关表征方法分析了水基钻屑固化体中产物种类为玫瑰花状水菱镁石和针状水碳镁石。分析水基钻屑固化体的微观结构,发现产物以连续的碳酸盐网络将水基钻屑固化成连续的固化体,证实了生物碳化固化钻屑的可行性。

Drilling cuttings,as solid waste formed during oil and gas exploration and development,was mainly solidified by cement.However,a large amount of carbon dioxide is formed during cement production.Therefore,a more efficient and environmentally method is urgently found for solidifying drilling cuttings.Bio-carbonization is a new reinforcement method for loose particles,which provides a new idea for the solidification treatment of water-based drilling cuttings.The experiment of water-based drilling cuttings solidified via bio-carbonization demonstrated that the strength of solidified body was decreased by increasing water content and urea concentration,and increased with increasing reactive magnesium oxide concentration and curing time.The water-based drilling cuttings solidified bodies were analyzed using related characterization.The results indicated that rosette Hydromagnesite and acicular Nesquehonite were yielded via synergy of Bio-carbonization.The microstructure of water-based drilling cuttings solidified bodies was observed,the results indicated that water-based drilling cuttings were solidified with continuous carbonate networks.The feasibility of water-based drilling cuttings solidified with bio-carbonization was verified through above researches.