发明名称 Drag block for increasing the fluid resistance in a well production tubing
摘要 The present invention pertains to a drag block that is attached over the exterior of, or screwed onto as an integral part of, oil well production tubing to increase the fluid resistance of the tubing. The increased fluid resistance of the tubing slows its descent through an oil or gas well filled or partially filled with fluid, thereby reducing the risk of damage to the casing, tubing or the well itself when a string of production tubing is inadvertently dropped through the well and hits bottom.
申请公布号 AU7471394(A) 申请公布日期 1996.01.25
申请号 AU19940074713 申请日期 1994.06.30
申请人 GEORGE C. BITTING, 发明人 GEORGE C. BITTING,
分类号 E21B17/10;E21B23/00;E21B41/00 主分类号 E21B17/10
代理机构 代理人
主权项
地址