An orifice blowout preventer

Abstract

The invention discloses an orifice blowout preventer. A barrel body (1) is composed of two half bodies where are symmetrically arranged. Semicircular annular cavities are formed in the upper parts of the half bodies. Each cavity is divided into an extrusion sealing area (4) and a pressure buffering area (5). A semicircular annular synthetic rubber ring block (6) is installed in each extrusion sealing area (4). Synthetic rubber ring sleeves (7) with openings are sleeved on the bottoms of the two half bodies. The bottom of each synthetic rubber ring sleeve (7) is supported by two third semicircular ring fixed plates (8). The top surface of each synthetic rubber ring sleeve (7) is attached to two third semicircular ring movable plates (9). The two third semicircular ring movable plates (9) can downwards move under the control of an extrusion device. According to the orifice blowout preventer, the problem of a large amount of water and gas at a drill hole under the condition that an orifice tube is not embedded in advance is solved, and the problem that an orifice outwards sprays water can be effectively prevented. Meanwhile, the orifice blowout preventer has the advantages of being reasonable in design, simple in structure, convenient and fast to install, good in safety performance and reliability, and the like.

Description

technical field [0001] The invention belongs to the technical field of geological drilling, and in particular relates to an orifice blowout preventer. Background technique [0002] In geological drilling, a large amount of water and gas may be encountered. When the orifice pipe is pre-buried, the drilling can be continued after the orifice blowout preventer is installed, or the drill pipe can be safely withdrawn. It takes 1-3 days to pre-embed the orifice pipe, which is not conducive to the construction period and cost; when the orifice pipe is not pre-embedded, the orifice blowout preventer cannot be used. If there is a threat of the working face being flooded during the process of withdrawing the drill pipe, Then there is nothing to do, causing economic losses and affecting the progress of the project. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an orifice blowout preventer that is easy to install. [000...

AI Technical Summary

Problems solved by technology

It takes 1-3 days to pre-embed the orifice pipe, which is not conducive to the construction period and cost; when the orifice pipe is not pre-embedded, the orifice blowout preventer cannot be used. If there is a threat of the working face being flooded during the process of withdrawing the drill pipe, If there is nothing to do, it will cause economic losses and affect the progress of the project.

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