Adjustable orifice sealing device for geological drilling

Abstract

The invention relates to an adjustable orifice sealing device for geological drilling. The device consists of a central pipe, an upper pressing disc, a bearing ring, a seal ring, a lower pressing disc and locking bolts, wherein both the upper end and the lower end of the central pipe can be connected with a drill stem; the bearing ring is welded on the central pipe; the upper pressing disc and the lower pressing disc are fixedly arranged on the bearing ring by using the locking bolts; and the external diameter of the seal ring is consistent with the internal diameter of an orifice pipe, and the seal ring and the orifice pipe are arranged in an annular space between the upper pressing disc and the lower pressing disc. The upper end and the lower end of the orifice sealing device are connected with the drill stem and then extend into the orifice pipe to form seal. The invention provides the adjustable orifice sealing device for geological drilling; the annular space between the orifice pipe and the drill stem can be more conveniently sealed to realize pressure leak stopping operation; meanwhile, the device has effects of maintaining pressure, righting, preventing blowout, keeping hole wallstable and the like; the drilling efficiency can be improved; and the drilling cost can be effectively reduced. In addition, the device has the advantages of simple structure, convenience in machining, low cost, long life and capability of being repeatedly used for a long time.

Description

Technical field [0001] The invention relates to an adjustable orifice sealing device for geological drilling, which is suitable for drilling maintenance operations such as pressure plugging in geological drilling construction. Background technique [0002] In geological drilling, drilling fluid loss is a common problem that plagues construction units. During the plugging process, only when the plugging material is effectively squeezed into the lost formation can the rapid plugging be realized and the strength of the plugging layer be improved. Therefore, applying a certain pressure in the hole for pressure plugging will help the plugging material to enter the lost formation quickly and effectively, and realize rapid plugging. In oil well drilling, the process of pressure plugging can be realized through sealing devices such as blowout preventers or orifice throttling devices; but in geological drilling, the orifice is generally open, and there is no similar sealing device, ...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the technical problem that the pressure plugging operation cannot be carried out due to the lack of orifice sealing device in the current geological drilling, the present invention provides an adjustable orifice sealing device for geological drilling, which can not only seal the hole more conveniently The annular space between the mouth pipe and the drill pipe meets the requirements of geological drilling for pressure plugging operations, and has the functions of maintaining pressure, straightening, preventing blowout, and maintaining the stability of the hole wall, which can improve drilling efficiency and effectively reduce drilling costs

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