Ball seat type rubber plug system for liner cementing

Abstract

The invention provides a ball seat type rubber plug system for liner cementing. The ball seat type rubber plug system comprises a drill rod rubber plug, a tail pipe rubber plug and a bearing seat (4), wherein the drill rod rubber plug is fed from a well mouth at the time of mud displacement, the tail pipe rubber plug is placed below a feeding tool, and the bearing seat (4) is located at the bottom of a tail pipe. The ball seat type rubber plug system is characterized in that the tail pipe rubber plug is a ball seat type tail pipe rubber plug, an expansion ball seat (13) is installed at the bottom of the tail pipe rubber plug, the bottom end of the expansion ball seat (13) is of an elastic closing-in structure, and the elastic closing-in structure is opened due to deformation when pressure meets the needs. By adopting the ball seat type rubber plug system provided by the invention, the ball falling time is reduced, the collision frequency between the ball and tail pipe bunches in the ball falling process is reduced, the difficulty of easiness in sticking and blocking when tripping balls in a extended reach well pass through a building section or tangent section at the bottom of the tail pipe is solved, the operation time is saved, the balls are protected, the sealing effect is improved, the displacement efficiency is effectively improved, the well cementation success rate is improved, the drilling time is saved and the drilling cost is lowered.

Description

technical field [0001] The invention belongs to the field of well cementing in petroleum and natural gas engineering, and in particular relates to a ball seat type rubber plug system for liner well cementing. Background technique [0002] With the development of the petroleum industry and the development of oil fields, there are more and more extended-reach wells. How to ensure the liner cementing quality of these complex wells is a major problem faced by field operators. [0003] At present, domestic liner cementing tools are usually hydraulic liner hangers. In the cementing process, in order to seal the pressure channel and generate hydraulic pressure to hang the hanger, it is necessary to perform ball throwing operations. In the process of the ball falling into the ball seat, the sealing effect may be affected due to collisions that may occur when the ball falls in the pipe string. In addition, the length of the falling distance of the ball also directly affects the ce...

AI Technical Summary

Problems solved by technology

Drilling efficiency is extremely low, and sometimes it is necessary to replace the drill bit and re-drill, resulting in a waste of time and resources

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