Multi-ball setting shaft stop valve

Abstract

The invention relates to a multi-ball setting shaft stop valve, which comprises a valve body and a valve seat, wherein the valve seat is positioned in a cavity of the valve body, and is pushed by a fluid to slide and set in the valve body, and the valve body is formed by detachably connecting an upper joint with a lower joint; a connecting part of the upper joint and the lower joint is sealed, and the valve seat is a piston; the piston is provided with at least two penetrating flow channels, and a transition part for guiding a plurality of balls to move to each setting position is arranged at a flow channel inlet. When the post-set balls move to the flow channel inlet, the set balls and the transition part form a guide channel for the post-set balls to move to the setting positions. The stop valve has enough large flow capacity to ensure the smooth slurry replacement and ball injection operations, and avoids the advanced setting caused by the cut-off function of the flow channel; the structural design is simple and reasonable, the stop valve is not only more suitable for processing and manufacturing, but also additional tooling is not needed in the assembly, disassembly and maintenance process; the operation is simple.

Description

technical field [0001] The invention relates to a wellbore shut-off valve in staged fracturing construction of a horizontal well, in particular to a wellbore shut-off valve with a plurality of sealing channels. Background technique [0002] At present, the staged fracturing technology of horizontal wells is increasingly applied to the reconstruction of low-permeability reservoirs to increase the production of oil and gas fields. The bottom end of the operation string of this process needs a tool to meet the following construction requirements, including that the liquid can pass through during the running of the string, and the passage can be closed to hold the pressure when the string reaches the specified depth. This type of tool used in existing oil and gas fields meets the above two basic conditions, but there are many defects in the actual use process, such as small flow area, early sealing due to flow closure, unreasonable structural design, and great difficulty in proc...

AI Technical Summary

Problems solved by technology

This type of tool used in existing oil and gas fields meets the above two basic conditions, but there are many defects in the actual use process, such as small flow area, early sealing due to interception, unreasonable structural design, and great difficulty in processing, assembly, disassembly and maintenance , complex sealing and locking mechanism, lack of stability, etc. These defects even limit the development of the entire construction process, so it is necessary to re-develop this tool

[0003] The stop valve in the prior art has only one flow hole, which is limited by the size of the pitching ball and has a small flow area. During the slurry replacement process, the displacement must be strictly limited, otherwise it will be seated in advance due to the interception effect; the design of the sealing and locking mechanism is complicated. Extruded rubber parts are forced into grooves or metal claws for anchoring, etc., resulting in poor stability due to unreasonable materials or shapes; although the existing globe valves can meet the most basic requirements for use in terms of overall structural design, they do not take into account dismantling. Convenience of installation and maintenance, such as the overall cylindrical design, the rest of the parts need to be inserted into the hole for installation or the design of too many parts is complicated, which increases unnecessary operation time and difficulty

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