针对蒸汽驱采油过程中套管长期处于高温高压状态导致套管损坏现象频繁等问题,统计分析辽河油田齐40块蒸汽驱套管损坏状况,对套管损坏过程进行力学和热力学研究。研究结果表明:油井注汽时,套管温度升高,产生热膨胀力,热膨胀力随温度升高而增大;当热膨胀力大于套管固井胶结阻力时,套管挣脱水泥环自由伸缩,同时在两者接触面产生斜面效应,使热膨胀力由纵向弹性力转变为不断增大的横向挤压力,导致套管挤压损坏,形成一套完整的套管损坏机理。据此研发了套管挂片技术,经初步试验表明,套管挂片可大幅提高其固井胶结力,降低套管损坏几率。研究成果对提高稠油老区开发效益具有重要参考意义。
In view of the long-term high temperature and high pressure of the casing and frequent casing damage in the process of steam flooding, a statistical analysis of the casing damage in the steam flooding of the Qi 40 Block in Liaohe Oilfield was conducted, and the mechanical and thermodynamic study was conducted for the casing damage process. The results showed that when steam was injected into the oil well, the casing temperature raised, resulting in thermal expansion force which increased with temperature; when the thermal expansion force was greater than the cementing resistance of the casing, the casing broke away from the cement sheath and expanded freely, and an inclined plane effect was produced on the contact surface of them, making the thermal expansion force change from the longitudinal elastic force to the increasing lateral squeezing force that brought extrusion damage to the casing, which is the complete casing damage mechanism. Based on the damage mechanism, the casing coupon technology was developed. Preliminary tests have shown that the casing coupon can greatly increase its cementing force and reduce the probability of casing damage. The study results are of important significance for improving the development benefits of heavy oil old areas.
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