All gas vented during the snubbing / stripping operation must be flared and burned a minimum of 50m from the well 要在离井口至少50米开外点着并燃烧承压起下管柱操作过程中排出的气体。
2.
Gravity ball check may be converted for air or gas venting by replacement of standard ball with floater pp ball 通过用漂浮的pp球更换标准球，重力球形止回阀可以改造为适用于空气或气体排气口。
