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旋转式井壁取心适用于全井段不同地层取心,特别适用于坚硬地层井壁取心,它兼有钻井取心和撞击式井壁取心的优点,但对取心仪器本身的设计以及钻井施工作业质量的要求高。从取心仪器设计角度出发,以中国海洋石油设计的旋转式井壁取心器为例,介绍了该取心器的结构组成、性能指标以及工作原理;从确保取心收获率的角度出发,探讨了影响取心收获率的地层因素、仪器本身因素以及与钻井相关的其他因素,明确提出了识别影响因素的工作流程以及针对具体因素相应的处理途径。
Rotary wellbore coring is suitable for coring in different strata of whole well, especially for hard coring wellbore coring. It has the advantages of drilling coring and percussion wellbore coring, but the design of coring instrument itself As well as the drilling operation quality requirements. From the perspective of coring instrument design, this paper introduces the structure, performance index and working principle of rotary hearth coring device designed by China National Offshore Oil Corporation. From the perspective of ensuring the coring rate, The stratigraphic factors affecting the rate of coring harvesting, the equipment itself and other factors related to drilling are discussed. The work flow of identifying the influencing factors and the corresponding processing approaches for specific factors are clearly put forward.