Leak-free sleeve suspending device

Abstract

The invention discloses a leak-free sleeve suspending device. The device comprises a sealing socket, sealing rings, a slip, and a slip seat which are connected by taking a sleeve as a shaft. The sealing socket is connected with the slip seat through a bolt; an inner conical hole of the slip seat is in taper fit with an outer wall of the slip; and tooth grooves are uniformly distributed on the inner wall of the slip to form a sleeve suspending slip limiting structure. A sealing structure into which the sealing rings are embedded is arranged in an inner hole, matched with the sleeve, of the sealing seat. In the leak-free sleeve suspending device, the slip consists of four to six equal tegular blocks; and a split slip is axially limited by a limit ring, and a radial screw hole installation screw which is uniformly distributed in the waist part of the slip seat locks the limit ring. During actual use, the bolt is adjusted, then the slip is accurately placed in the inner conical hole of the slip seat, radially applied force is uniform, and the wall of the suspended sleeve is not deformed, so that the sealing performance of the sealing structure at the upper end is not influenced. The sleeve is suspended reliably, and sealed strictly; and any resin implantation operation is not required during use, the safety performance of a product is greatly improved, and using cost is reduced directly. The leak-free sleeve suspending device is suitable for sleeves with different calibers.

Description

technical field [0001] The invention relates to an oil drilling and production wellhead device, in particular to a non-leakage suspension device for casing. Background technique [0002] Casing is one of the necessary procedures of oil drilling. The casing hanging device is a special tool for casing running. It should not only keep the hanging reliable but also keep the seal during the casing hanging. The commercial casing suspension device on the market is equipped with a coaxial sealing structure and a clamping structure. The sealing structure is a conventional O-ring sealing structure, and the clamping structure is a kind of clamping and clamping casing that uses a tapered sleeve type slip. The tapered sleeve type slips in the prior art have an integral structure, with axial opening grooves evenly distributed on the wall, and elastic deformation is used to clamp the outer wall of the casing when tightening. The existing commodity casing suspension device has a simple cla...

AI Technical Summary

Problems solved by technology

Practice has proved that proper amount of grease injection can temporarily alleviate the leakage problem, but excessive grease injection will cause greater deformation of the casing, thereby further deteriorating the original sealing structure

In general, when the casing suspension device leaks, grease injection cannot fundamentally solve the leakage problem, it is only a remedial measure

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