Abstract:

Well Ma02 is a horizontal monitoring well located in the fault block of well block Ma13 in Mahu Sag of the central depression of Junggar Basin. The conglomerate strata of Baikouquan Formation in this well block are broken after volume fracturing，and are very difficult for coring. For 270 m continuously coring in the horizontal section of well Ma02，there exist many uncertain factors，and it is difficult to control the trajectory. The horizontal well conformal coring technology developed by Research Institute of Engineering Technology，CNPC Western Drilling Engineering Co.，Ltd. was used，and the problem of loose and shapeless in target layer coring was satisfactorily solved^[1]. It has been proven by continuously multi-barrel coring practices that this technology can effectively improve the core recovery in horizontal sections，providing experience for coring in loose strata. The adopted tools，technical parameters，technical measures and actual application results of this coring technology are introduced in details.

Key words: conformal coring, horizontal well coring tool, trajectory control, volume fracturing

摘要： 马02井是一口位于准噶尔盆地中央坳陷玛湖凹陷玛13井区断块的水平监测井。该井区百口泉组砂砾岩地层经过体积压裂后地层破碎，取心难度大。马02井水平段连续取心270 m，轨迹控制难，具有不确定性因素多的特点，采用了西部钻探工程技术研究院水平井保形取心技术，较好地解决了该井目的层松散不成形的问题。通过连续多筒取心实践证明，该项技术能有效提高长水平段取心收获率，对松散地层取心提供经验。详细介绍了该项取心技术所使用的工具、采用的技术参数、技术措施和实际应用的效果。

关键词: 保形取心, 水平井取心工具, 轨迹控制, 体积压裂