Multifunctional well-completion sieve tube tool and usage method thereof

Abstract

The invention provides a multifunctional well completion screen tool and a using method thereof. The multi-functional well completion screen tool of the present invention comprises: a drill string body, a screen pipe body and a valve ball; the drill string body has an axial channel, and joints are respectively provided at both ends, and a drill string hole is radially opened on the drill string body for use in In order to communicate with the outside of the drill string body and the channel, the bottom of the drill string body has a downward limit structure; the screen tube body has an axial channel, the screen tube body is set in the drill string body, and the screen tube body and the drill string body are fixed; the screen tube body The inner wall of the body is formed with a tapered valve seat, and the outer peripheral surface of the screen body is provided with an annular groove, and there is a slit in the annular groove connecting the outside of the screen body and the channel; the screen body and the drill string body are in the axial direction A first sealing part, a second sealing part and a third sealing part are sequentially formed to seal the annular groove and the drill string hole; the valve ball is used to cooperate with the taper surface of the valve seat to close the channel in the screen body. The invention realizes the tool which has both the function of the drill string and the function of the well completion screen.

Description

technical field [0001] The invention relates to the technical field of oilfield equipment, in particular to a multifunctional well completion screen tool and a usage method thereof. Background technique [0002] At present, with the development of drilling technology, the requirements for the strength and quality of the drill string are getting higher and higher, and the completion operation is becoming more and more difficult, and the risks are also getting higher and higher. The three-high gas fields with high pressure, high yield and high sulfur content are in the early stages of large-scale exploration and development. However, in recent years, the safety production situation in the exploration and development of sour gas fields has been severe, and there have been many serious out-of-control blowout accidents and hydrogen sulfide poisoning accidents, resulting in A large number of casualties may cause a large number of people to be evacuated, which has brought serious a...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a multi-functional well completion screen tool and its use method to overcome the problem of low safety in the prior art that different tools are used for the drill string and the well completion string

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