A coiled tubing four-ram blowout preventer semi-sealing device and method
A technology of blowout preventer and four rams, which is applied in earthwork drilling, sealing/isolation, wellbore/well components, etc., can solve the problems of half-sealing device failure, poor sealing, failure, etc., and avoid half-sealing Ineffectiveness, avoiding man-made damage, reducing the effect of hard friction
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Embodiment 2
[0051] Embodiment 2, the difference from Embodiment 1 is: the section of the side of the setting expansion side (5.1) of the present invention in contact with the coiled tubing is an arc-shaped structure, and the section of the other side is a protrusion that is conducive to rebound Arc structure.
[0052] The method of use is the same as that of Example 1, the difference is: as the hydraulic pressure rises, the setting expansion side (5.1) expands in one direction under the action of pressure to form a cup seal structure, so that it is tight and continuous The outer wall of the tubing forms a seal; while the cross-section of the side in contact with the coiled tubing is an arc-shaped structure, the opposite direction forms a raised bowl-bottom shape.
Embodiment 3
[0053] Embodiment 3, difference with embodiment 1 and 2 is: with reference to appended Figure 5 , the setting expansion side (5.1) of the present invention is a three-stage structure, the cross-section of the side in contact with the coiled tubing is composed of an arc structure, a plane structure and an arc structure, and the middle section is a plane structure. In this way, the plane structure in the middle is better combined with the outer wall of the coiled tubing, forming a larger sealing surface and a longer-lasting sealing effect.
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