Oil well wellhead blowout preventer

Abstract

The invention relates to an oil well mouth blowout preventing device. Two semi-casings are clamped oppositely to be fixed to form a cap-shaped casing. The casing is provided with a top cover integrally molded and a cavity with a lower opening, the lower portion of the casing is provided with a jackscrew hole for a jackscrew to penetrate through, and the jackscrew hole is used for fixing the oil well mouth blowout preventing device on the periphery of a well mouth packing box pressing cover. A gap is formed between the lower portion of a casing inner wall and an outer wall of the well mouth packing box pressing cover. The top cover is provided with a central hole for a polish rod to penetrate through, and the central hole is communicated with a cavity. An annular packing tray is fixedly arranged in the cavity, and an accommodating space for accommodating packing is arranged between the packing tray and the top cover. Therefore, well liquid ejected out during blowout is blocked on an inner wall of the blowout preventing device passively through the cap-shaped structure and flows back to an oil jacket annulus along the inner wall, and large-area environment pollution can not be caused during blowout.

Description

technical field [0001] The invention relates to an auxiliary sealing device for the wellhead of an oil well, in particular to a blowout prevention device for the wellhead of an oil well. Background technique [0002] In the production operation of pumping wells, in order to ensure that the reciprocating polished rod does not bring the oil to the ground to cause waste and pollution, the wellhead section of the polished rod is generally sealed. The existing sealing devices such as figure 1 As shown, it has two levels of wellhead sealing packing on the wellhead sealer 9, which are the first level packing 7 and the second level packing 11, wherein the second level packing 11 is connected to the outer side of the second level packing adjustment handle 10. When the oil well is in normal production, the secondary packing 11 is in the open state through the adjustment of the handle 10 (there is a gap with the polished rod 1); , when the oil well is in normal production, the first-l...

AI Technical Summary

Problems solved by technology

However, when the oil well pipeline is abnormal or the liquid production rate is too high, the back pressure of the oil well will increase. If the back pressure exceeds the design bearing pressure of the primary packing 7, there is a risk of wellhead oil injection; in addition, the long-term packing Abrasion occurs after use, which may also cause blowout accidents

Once a blowout accident occurs, coupled with the spread of the sprayed oil with the wind, it will cause large-scale environmental pollution.

If the on-site staff forcibly stops it during the blowout, it may cause personal injury to the staff

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