Spring type automatic grout valve

Abstract

The invention discloses a spring type automatic grout valve, which is characterized in that an upper valve seat body(a guiding seat) and a lower valve seat body (a guiding seat) are connected with a screw thread in a casing pipe nipple; a lower rod of a semi-sphere guide rod is inserted into a guiding hole of the lower valve seat body (the guiding seat); the semi-sphere guide rod is sleeved with a plastic spring which is propped against the upper valve seat body (the guiding seat) to support the semi-sphere guide rod; an upper rod of the semi-sphere guide rod is inserted into a guiding hole of the upper valve seat body (the guiding seat); the plastic spring is support between the upper valve seat body (the guiding seat) and the semi-sphere guide rod, so that a semisphere on the semi-sphere guide rod is not contacted with a conical surface of the upper valve seat body (guiding seat), and a fluid channel is formed; and the purpose of automatic grouting is achieved. When well kick, blowout and back flow of grout after decompression completeness in well cementation grouting occurs in a pipe,, a fluid flowing at a high speed acts on a lower plane of the semisphere of the semi-sphere guide rod, the spherical surface of the semi-sphere guide rod and the conical surface of the upper valve seat body (the guiding seat) form sealing after the plastic spring is compressed or broken by extrusion, and an effect of a check valve is achieved.

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 running in oil drilling, because the commonly used floating hoops, floating shoes, and inner pipe cementing devices only play the role of check valves, and because of the limitation of pressure bearing capacity and casing anti-collapse strength, casing running When reaching a certain well depth, in order to prevent the floating hoop (floating shoe or inner pipe cementing device) from failure due to excessive ...

AI Technical Summary

Problems solved by technology

At the same time, it can also ensure the function of a check valve in the event of well kick, blowout in the pipe, and a certain pressure difference between the inside and outside of the cementing end to form a certain flow rate, so as to prevent the blowout in the pipe, blowout accidents in the pipe, and the return of cement slurry after the cement injection. question

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