Inner blowout preventer of full-port drilling tool

Abstract

The invention relates to an inner blowout preventer of a full-port drilling tool. A valve body is internally provided with a passage and a lug boss; a left valve plate and a right valve plate are semi-circle conical; and the upper ends of the left valve plate and the right valve plate are respectively provided with outer flanges which are hung on the upper end surface of the lug boss and are in an open state so that the passage is in a through state. The invention has reasonable and compact structure and convenient use; and the conical valve plates can be fully opened in a positive cycle or static state to smoothen the passage of the drilling tool so as to reduce circulating pressure loss, basically have no erode to a valve core and carry out corresponding drilling operation by various instruments and tools with outside diameters smaller than a certain size. The inner blowout preventer of the full-port drilling tool can be automatically closed under the push of liquid dynamic power so as to take the blowout-preventing effect in case of blowouts in the drilling tool during the drilling operation, thereby not only extremely improving the processing rate during downhole accidents, but also improving the anti-erosion capability of the valve and further measuring the pressure of a vertical pipe.

Description

1. Technical field [0001] The invention relates to a blowout preventer in a drilling tool, which is a full-diameter blowout preventer in a drilling tool. 2. Background technology [0002] "Secondary well control" with wellhead pressure control as the content is the key core process of the whole well control. At present, there are many means of controlling the wellbore annulus, such as annular blowout preventer, single ram, double ram, etc. Under certain circumstances, there are still means to remedy the out-of-control annular blowout. However, once the inside of the drilling tool is out of control, it is difficult to remedy, and the use of shear drilling tools is only a helpless measure, and most wells are not equipped with shear rams due to various reasons. At present, the commonly used blowout prevention tools for drilling tools mainly include: cock, arrow check valve, drop-in check valve, spring forced check valve, butterfly check valve, etc. The advantages of the abov...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a blowout preventer inside a full-bore drilling tool, which overcomes the above-mentioned deficiencies in the prior art. It can not only realize the effect of effective blowout prevention, but also enable various drilling instruments or tools to run in or out smoothly. , so as to solve the problem that various drilling instruments or tools cannot be lowered into the existing drilling tool due to the main diameter of the blowout prevention tool

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