A kind of floating hoop floating shoe and using method thereof

Abstract

The present invention relates to the technical field of cementing tools in the oil drilling industry, in particular to a floating hoop shoe and its use method. The floating hoop shoe includes a shell, and a valve seat is arranged in the inner cavity of the shell from bottom to top and a spool assembly, the spool assembly includes a spool and a spring sleeved above the side wall of the spool, the other end of the spring is fixed in the inner cavity of the housing, and the spool includes a valve The core body, the valve core body is provided with a semi-closed flow channel in the axial direction, the side wall is provided with a first through hole communicating with the flow channel, and the end of the flow channel away from the valve seat is connected to the housing. lumen. The floating hoop shoe provided by the invention can improve the switching efficiency of the valve core, effectively reduce the tremor generated when the mud flows, and ensure the process stability.

Description

technical field [0001] The invention relates to the technical field of well cementing tools in the petroleum drilling industry, in particular to a floating hoop floating shoe and a using method thereof. Background technique [0002] In the oil drilling industry, cementing is an important link, and the tool accessories used in the cementing process ensure the quality of cementing. Sometimes when performing cementing operations, the existing tools are difficult to meet the needs of cementing, and even cause the failure of the entire project. In order to ensure the cementing quality of these complex wells and meet the needs of the cementing site, corresponding cementing tools are needed. [0003] Floating shoes or floating hoops are casing guide shoes or couplings that can generate buoyancy. They have the function of preventing cement slurry from flowing back. At the same time, they also have the functions of bumping the rubber plug during well cementing, limiting the depth of...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the floating hoop shoes generally have the disadvantages of low sealing efficiency, poor sealing effect and poor pressure bearing capacity.

In addition, due to the lack of a shock-absorbing structure to eliminate the vibration in the floating hoop shoe, the vibration caused by fluid such as mud during the cementing process is relatively large, and the vibration will cause the position of the valve core to shift, resulting in a gap between the valve core and the valve seat. The tightness is further reduced, and even the backflow of cement slurry is caused, resulting in cementing accidents

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