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深井、超深井钻井时间长,井下工况复杂,套管磨损严重,威胁油气井的安全。在不同密度的聚磺体系水基泥浆中进行了N80、P110、VM140和TP140套管磨损试验,测得磨损预测所需的磨损效率、摩擦系数和磨损综合影响因子(CWIF)等参数,分析了泥浆密度和套管钢级对套管磨损性能的影响。通过套管磨损表面扫描电镜图片分析了磨损机理。结果表明:套管钢级越高,其耐磨性越好;泥浆密度越高,套管与钻杆试样间的摩擦系数越大,磨损越严重;套管钢级越高,泥浆密度越大,磨损效率对泥浆密度越不敏感;套管钢级越低,机械犁沟磨损和疲劳磨损越严重;泥浆密度越大,犁沟磨损减轻,疲劳磨损增加。提出了用凿削式磨损机理分析套管表面磨损的成因。
Deep wells and ultra-deep wells have a long drilling time, complicated underground conditions and serious casing wear and threaten the safety of oil and gas wells. N80, P110, VM140 and TP140 casing wear tests were carried out in different density polysulfone-based water-based muds, and the wear efficiency, friction coefficient and CWIF parameters required for wear prediction were measured. Effect of Mud Density and Casing Steel Grade on Casing Wear. The mechanism of wear was analyzed by scanning electron microscope (SEM) images of the casing wear surface. The results show that the higher the bushing steel grade, the better the wear resistance. The higher the mud density, the larger the friction coefficient between the bushing and the drill pipe specimen, the more severe the wear. The higher the bushing steel grade, the higher the mud density Large, wear efficiency is less sensitive to the mud density; the lower the bushing steel grade, the more serious the mechanical furrow wear and fatigue wear; the greater the mud density, the furrow wear reduced, fatigue wear increased. It is proposed that the cause of wear on the casing surface is analyzed by chiseling wear mechanism.