Drill string disconnection and re-hookup device for non-riser dual-gradient drilling operation
A double-gradient and riser technology, which is applied in the direction of wellbore/well valve devices, drilling equipment, drill pipes, etc., can solve the problems of no drill string tie-back and channel re-opening, economic loss, unsatisfactory ball valve plugging effect, etc. problems, to achieve the effect of reducing the economic cost of mining and protecting the environment
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[0033] The present invention will be further described below in conjunction with the accompanying drawings. The protection scope of the present invention is not limited to the following description:
[0034] Such as Figure 1~11 As shown, a double-gradient drilling drill string release and tie-back device without riser includes an upper joint 1, a stop pin slider 2, an ejection rod member 3, a rotating shaft 4, a shear pin 5, a spring sleeve 6, Push pin spring 7, outer housing 8, drive sliding sleeve 9, O-ring Ⅰ10, inner housing 11, drive spring 12, rotating shaft 13, valve seat 14, valve disc 15, lower joint 16, torsion spring 17 and connecting screw 18; The upper joint 1 and the outer shell 8 are connected by a connecting screw 18. The push pin spring 7 is installed in the spring sleeve 6 and the shear pin 5 is screwed on the spring sleeve mounting boss on the outer shell 8 to form the male body part. The pin member 3 is fixed in the installation rectangular hole 1103 of the i...
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