High-back-pressure miniature pressure relief switch for petroleum drilling

Abstract

The invention provides a high-back-pressure miniature pressure relief switch for petroleum drilling. The high-back-pressure miniature pressure relief switch for petroleum drilling comprises an upper pressure ring, a rupture pressure relief diaphragm, a back-pressure-resistant auxiliary diaphragm and a sealing ring, wherein the rupture pressure relief diaphragm is arranged at the lower end of the upper pressure ring, the back-pressure-resistant auxiliary diaphragm is arranged at the lower end of the rupture pressure relief diaphragm, the sealing ring is arranged at the lower end of the back-pressure-resistant auxiliary diaphragm, and the edges of the upper pressure ring, the rupture pressure relief diaphragm, the back-pressure-resistant auxiliary diaphragm and the sealing ring are welded into a whole through argon arc welding. According to the high-back-pressure miniature pressure relief switch for petroleum drilling, the rupture diaphragm and the auxiliary diaphragm are jointly attached to the position between the upper pressure ring and the sealing ring, so that the effect of obtaining the maximum pressure relief area under the condition that the appearance is minimum is achieved.

Description

technical field [0001] The invention relates to the technical field of oil drilling, in particular to a high back pressure miniature pressure relief switch for oil drilling. Background technique [0002] At present, the combination of vertical drilling and horizontal drilling technology is adopted to expand the oil production area of ​​an oil well as much as possible. In the application of this technology, a micro switch with high back pressure resistance is required, which is required to have the characteristics of small size and stable discharge pressure, and the product performance requirements meet the needs of special working conditions at the bottom of the well. At the initial stage of entering the well, the micro switch bears a back pressure higher than the rupture pressure of the pressure relief diaphragm itself on the pressure relief side. If no measures are taken, the pressure relief diaphragm will be destroyed. When going downhole, as the depth increases, the dow...

AI Technical Summary

Problems solved by technology

[0008] According to the above-mentioned technical problem that the existing pressure relief structure has a complex structure and cannot withstand excessive pressure, a high back pressure miniature pressure relief switch for oil drilling is provided

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