A multi-layer test sampling valve

Abstract

The invention discloses a multilayer testing sampling valve. The multilayer testing sampling valve comprises a mandrel and a shell; the shell is shaped like a cylinder, a channel with a flared section is formed in the lower section of an inner cavity of the shell, a through hole matched with the outer diameter of the mandrel is formed in the top end of the shell, the mandrel with a main liquid channel penetrates through the through hole, two o-shaped sealing rings are embedded in the inner wall of the through hole, the sealing effect is achieved when the mandrel moves up and down in the through hole, a convex ring matched with the inner cavity of the shell is formed on the outer wall, on the lower half part, of the mandrel, two o-shaped sealing rings are embedded in the outer peripheral face of the convex ring, the mandrel, the convex ring and the inner cavity of the shell can form a closed sampling cavity, a mandrel side opening is formed in the side face of the upper portion of the mandrel, when the bottom of the convex ring is located at the bottom of the inner cavity above the flared section, the mandrel side opening is just located between the o-shaped sealing rings of the through hole in the top end of the shell, and the sampling cavity is a closed cavity. According to the multilayer testing sampling valve, switching-on and switching-off are only for a single layer and do not affect communication of a main runner.

Description

technical field [0001] The invention relates to a sampling valve, in particular to a multi-layer testing sampling valve for oil testing. Background technique [0002] Well testing is an important part of oil field production. After years of production practice, oil testing and testing technology has developed into a pipe string construction technology with testing valves, packers and pressure gauges as the main tools. The test valve is an indispensable main tool for communicating the formation fluid with the pipe string, and three test valves with different structures have been formed. One is to realize the opening and closing of the valve body by lifting the lower pipe string (represented by the MFE test valve); the other is to realize the opening and closing of the valve body by pressing the annular space (represented by the APR test valve); The first is to realize the opening and closing of the valve body (represented by the sliding sleeve test valve) by throwing the ba...

AI Technical Summary

Problems solved by technology

One is to realize the opening and closing of the valve body by lifting the lower pipe string (represented by the MFE test valve); the other is to realize the opening and closing of the valve body by pressing the annular space (represented by the APR test valve); The first is to realize the opening and closing of the valve body (represented by the sliding sleeve test valve) by throwing the ball on the ground and pressing the pipe string. These three test valves have their own characteristics and application processes, and they cannot simultaneously realize formation sampling, Multi-layer test construction process requirements

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