Inserted tooth and threaded slip insert plate

Abstract

The invention relates to an inserted tooth and threaded slip insert plate for clamping a casing used in oil and gas drilling and well cementation equipment technologies. The casing is clamped through a spherical slip insert teeth on the slip insert plate, so that the bearing capacity of the slip insert plate is high, and the service life of a casing post and the slip insert plate is long. According to the technical scheme, an inclined surface is formed in the inner side of the slip insert plate; a round hole or a threaded hole is formed in the surface of a regular polygon on the outer side; the round hole or the threaded hole is spirally arranged in an ascending mode around a center line of the slip insert plate; a through hole is formed in the inner side of a slip seat; an axial groove with an inclined surface is formed in the outer side; the slip insert plate is arranged in the axial groove of the slip seat; the top of the slip insert tooth of the inserted tooth is spherical, and the bottom of the slip insert tooth is cylindrical; the slip insert tooth is inlaid in the round hole of the slip insert plate to form the inserted tooth slip insert plate; the top of the threaded slip insert tooth is chamfered edge spherical, and a threaded rod is arranged at the bottom of the threaded slip insert tooth; the tooth is in fixed threaded connection with the threaded hole of the slip insert plate to form the threaded slip insert plate. According to the slip insert plate, tooth wear and casing damage can be reduced, so that the service life of the slip insert plate and the casing is prolonged.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling and cementing equipment, in particular to an insert and a threaded slip die plate for clamping the casing when a top drive casing running device is used for operation. Background technique [0002] Casing operation is an important link in drilling and cementing operations. The quality of the operation directly affects the quality of cementing, oil production and the life of the oil well. The traditional casing running process is to use a simple elevator to lift the casing, and use hydraulic casing tongs to rotate and make up the casing. This traditional casing running method has problems such as complicated operation, difficult to accurately control the torque, and inability to circulate mud at any time as needed. , the use of the top drive casing running device can not only overcome the above shortcomings of the traditional casing running operation, but also improve the casing runnin...

AI Technical Summary

Problems solved by technology

The triangular slip teeth on the slip plate are in point-to-face contact with the sleeve wall, the contact area is small, and the contact stress per unit area between the slip teeth and the sleeve is large, which limits the load-bearing capacity of the slip plate. The teeth are also prone to bite into the sleeve wall, causing wear on the slip teeth and damage to the sleeve

Especially in corrosive wells, the teeth of conventional triangular slips are easy to bite into the casing wall, destroying the anti-corrosion layer of the casing wall, reducing the strength of the casing, accelerating the chemical corrosion of the downhole casing, and causing downhole accidents in serious cases

Therefore, this triangular slip tooth limits the load-bearing capacity of the slip plate, reduces the service life of the slip plate and casing, and increases the cost of oil and gas extraction

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