连续油管注入器是连续油管作业装置的关键设备，根据其工作原理，将油管夹紧机构及张紧机构采用单缸杠杆方式，链条驱动机构采用油马达加减速机构方式，可以在保证性能的条件下，降低注入器制造成本。对于油管在高压井作业时的失稳问题，只要注入器的夹紧压块以下到油管导口问距离小于３８０ｍｍ，常用油管就可用于７０ＭＰａ的高压井内作业而不会失稳。根据对连续油管注入器载荷的分析，得出注入器链条载荷与井口压力和油管下入井深间的关系及夹紧油缸和张紧油缸负载计算方法，对于３８．１油管，在井口压力大于或等于２５ＭＰａ的情况下，链条的牵引载荷始终与链条牵引力的方向相反，油马达不会受到扭矩；井口压力小于２５ＭＰａ，油管下入一定深度后，链条的牵引载荷会与链条牵引力的方向相同，但这时载荷的绝对值较小，对系统影响不大。若欲减小注入器张紧油缸的载荷，设计时应尽可能减小驱动链轮的轴线与张紧链轮的轴线间的水平距离。 Coiled tubing injector is the key equipment for coiled tubing operation device. According to its working principle, the tubing clamping mechanism and tensioning mechanism adopts single-cylinder lever method, the chain drive mechanism adopts oil motor acceleration and deceleration mechanism, Lower injector manufacturing costs. For tubing instability in high-pressure well operation, as long as the distance between the clamping clamp of the injector and the tubing guide is less than 380mm, the common tubing can be used for operation within a 70MPa high-pressure well without destabilization. Based on the analysis of the load of coiled tubing injector, the relationship between injector chain load and wellhead pressure and tubing downhole depth is obtained, and the calculation method of clamping cylinder and tensioning cylinder load is obtained. For 38.1 tubing, Equal to 25MPa, the traction load of the chain is always opposite to that of the traction force of the chain, and the torque of the oil motor will not be affected. When the pressure of the wellhead is less than 25MPa, the pulling load of the chain will be the same as that of the traction force of the chain At this time the absolute value of the load is small, little impact on the system. To reduce the load on the injector tensioning cylinder, the design should minimize the horizontal distance between the axis of the drive sprocket and the axis of the tensioning sprocket.