稀土微合金化稠油热采井套管BT100H的研究

Study on Casing BT100H of Rare Earth Microalloying for Heavy Oil Thermal Recovery Well

稠油开采的套损率要远高于稀油开采过程中的套损率,大大增加了稠油开采的成本,API标准套管已远远不能满足稠油生产的需求,近年来,油田倾向于采用专门针对稠油开采而特殊设计的非API稠油热采专用套管,该类套管附加值较高、有较好的市场前景。通过合理的钢种成分和生产工艺设计,采用中碳Cr-Mo钢以及稀土微合金化的思路,利用稀土的微量固溶、净化晶界、变质夹杂物等作用,设计出了满足稠油热采井工况用BT100H套管,使得套管材料具有高温强度高、蠕变极限高、应力松弛稳定性好、膨胀系数低、横向冲击韧性高等特点。

The casing damage rate of heavy oil well is much higher than that of dilute oil well in the process of oil exploitation, which greatly increased the cost of heavy oil exploitation. API standard casing is far from meeting the demand of heavy oil production. In recent years, the oil field tends to adopt special designed non API heavy oil thermal recovery casing. This kind of casing has high added value and good mar-ket prospect. Through the reasonable chemical composition and production process design, the medium carbon Cr-Mo steel and rare earth microalloy are adopted. The use of rare earth trace solid solution strengthening, purification of grain boundaries, such as the role of metamorphic inclusions, the heavy oil well BT100H casing was designed to meet the needs, the casing material has the advantages of high temperature strength, high creep limit, good stress relaxation stability, low expansion coefficient and high transverse impact toughness.