Pneumatic slip type elevator chuck

Abstract

The invention discloses an air operated slips-type elevator chuck. The air operated slips-type elevator chuck comprises a main body and slips which are arranged in the main body, wherein each dental plate groove of the slips is provided with two bearing sections from top end to the lower part of a slips body, the two bearing sections are respectively arranged in the middle position and the lower part of the dental plate groove, the main body is provided with a lug boss which is connected with a drilling platform, slips teeth are installed on the dental plate groove of the slips body, the center of each dental plate groove and an outer tapered surface of the slips body are designed into an eccentric structure, and a gap is arranged between the outer tapered surface of the slips body and the inner tapered surface of the main body. After bearing a large-ton load, the bottom of each dental plate groove is unlikely to deform, a greater torque can be borne, the slips can be easily raised, a traveling switch is arranged inside the main body, when the slips body is lowered to be contacted with a contact of the traveling switch, the embracing force of the slips is increased, and a pipe column is more firm to clamp by the slips.

Description

technical field [0001] The present invention relates to a kind of equipment used in the oil and natural gas casing operation process, in particular to a pneumatic slip type elevator chuck. Background technique [0002] The existing casing operation usually uses casing elevators and casing slips to cooperate with each other, and some well teams use casing elevators / chucks for casing operations. Figure 4 As shown, each tooth plate slot of the traditional slip body has only one bearing surface 4' from the top to the bottom of the slip body. When bearing a large tonnage load (750 tons, 1000 tons), the bottom of the tooth plate slot is prone to deformation . Figure 5 As shown, after the traditional slip body is installed with the tooth plate in the tooth plate groove to hold the pipe string, the center of the pipe string is concentric with the outer cone surface of the slip body. The cone surfaces are all overlapped. After bearing a large tonnage load, the outer cone surface o...

AI Technical Summary

Problems solved by technology

[0002] The existing casing operation usually uses casing elevators and casing slips to cooperate with each other, and some well teams use casing elevators / chucks for casing operations. Figure 4 As shown, each tooth plate groove of the traditional slip body has only one bearing surface 4’ from the top to the bottom of the slip body. When bearing a large tonnage load (750 tons, 1000 tons), the bottom of the tooth plate groove is prone to deformation

Figure 5 As shown, after the traditional slip body is installed with the tooth plate in the tooth plate groove to hold the pipe string, the center of the pipe string is concentric with the outer cone surface of the slip body. The cone surfaces are all overlapped. After bearing a large tonnage load, the outer cone surface of the slips and the inner cone surface of the main body undergo elastic deformation. After unloading, the contact area between the outer cone surface of the slips and the inner cone surface of the main body is still large, resulting in slips Body is not easy to lift

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