Spring type automatic grouting valve

Abstract

The invention discloses a spring type automatic grouting valve. The spring type automatic grouting valve is structurally characterized in that a lower valve seat body is connected with a lower-portion threaded joint inside a sleeve short section, a lower rod of a hemi-spherical guiding rod is inserted into a guiding hole of a lower valve seat body, an upper rod of the hemi-spherical guiding rod is inserted into a guiding hole of the upper valve seat body, the upper valve seat body is connected with the upper portion of the inside of the sleeve short section through a threaded joint, a plastic spring sleeves the upper end of the hemi-spherical guiding rod and is supported between the bottom face of the upper valve seat body and the upper spherical face of the hemi-spherical guiding rod, so that the hemi-spherical guiding rod cannot completely and upward move, a fluid channel is formed between a hemisphere and the upper valve seat body, and the automatic grouting purpose is achieved. When well kick and blowout occur in a pipe and well-cementing displacement mud is discharged and presses cement grout to flow backward, a fluid flowing at high speed acts on a lower-portion plane of the hemisphere of the hemi-spherical guiding rod, the plastic spring is compressed and accordingly deforms or breaks, the hemi-spherical face of the hemi-spherical guiding rod is in tight contact with the conical face of the upper valve seat body under the guiding effect of the guiding rod to form sealing, and the effect of a check valve is played.

Description

technical field [0001] The invention relates to the method of manual grouting without stopping the casing operation in the casing casing operation of oil drilling, which can be automatically grouted. At the same time, it can also ensure that it will play the role of a check valve in the event of blowout and blowout in the pipe, and when the cementing and grouting operation is completed, it will play the role of a check valve to avoid blowout in the pipe and return of cement slurry to ensure the quality of cementing. Background technique [0002] In the process of casing casing in oil drilling, the commonly used floating hoops, floating shoes, and inner pipe cementing devices always only play the role of check valves, and because of the limitation of pressure bearing capacity and casing anti-collapsing strength, the casing When going down to a certain depth, in order to prevent the floating hoop (floating shoe or inner pipe cementing device) from failing due to excessive liqu...

AI Technical Summary

Problems solved by technology

This not only delays a lot of casing running time, but also increases the labor intensity of workers. It may also cause pressure difference tube accidents caused by untimely casing movement when the casing operation is stopped and grout is poured into the casing, which delays oil and gas exploration. schedule

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