Self-rotating drillable reaming float shoe

Abstract

The invention discloses a self-rotating drillable reaming float shoe which comprises a shell body and a transmission structural part arranged in the lower end of the shell body in a sleeved manner. The transmission structural part is rotationally connected with the shell body, and a self-rotating guide head, the shell body, the transmission structural part and a rolling structural part are combined in a pairwise manner, so that a guide head which does not have the rotating function originally can freely rotate by 360 degrees, and the function that the tool automatically rotates to guide a casing pipe to be tripped in is achieved; by arranging a cutting and righting assembly, when a barrier is encountered in the casing pipe tripping-in process, cutting and reaming can be carried out on a necking-down well wall section by using a metal cutting block, the well diameter of the necking-down well wall section is enlarged to the normal size, and follow-up smooth casing pipe tripping-in is facilitated; and centralizing strips are used for centralizing the casing pipe, ensuring the local centrality of the casing pipe and improving the well cementation quality, the problems that an existing product is only suitable for a specific tripping-in tool and is small in application range are solved, the application range of the self-rotating drillable reaming float shoe is widened, and the self-rotating drillable reaming float shoe is not limited by the tripping-in tool.

Description

technical field [0001] The invention belongs to the technical field related to petroleum production, and in particular relates to a self-rotating drillable eye-marking floating shoe. Background technique [0002] At present, the conventional cementing floating shoes have no effect of piercing holes. When running the casing, the resistance points on the well wall will squeeze the casing, causing the casing to be blocked and deformed, which seriously affects the solidification. At the same time, the existing anti-backflow mechanism is composed of a valve stem, a valve ball, a spring, a valve seat, and a fixing piece that slides with the valve stem. When the working fluid flows through the valve stem and spring, the valve stem and the fixing piece are prone to The appearance of being stuck causes the valve ball to fail to seal with the valve seat, so that the floating shoe loses the anti-backflow effect, and the spring is easily corroded, and the service life is not long. [0...

AI Technical Summary

Problems solved by technology

[0010] The object of the present invention is to provide a self-rotating drillable reaming floating shoe to solve the problems of no guiding function, unstable pressure bearing of internal structural parts and high cost proposed in the background art

Images