Perforating bullet improving tunnel flow conductivity

Abstract

The invention relates to the technical field of support equipment of mine construction and particularly relates to a perforating bullet improving the tunnel flow conductivity. In a perforation tunnel forming process, the perforating bullet can remove the perforation compaction zone and reduce the blocking of a perforation slug; and with the effects of cleaning the perforation, improving the tunnel flow conductivity and increasing the oil / gas well capacity, the perforating bullet improving the tunnel flow conductivity comprises a bullet body, an energetic material liner integrated by tight compaction in the bullet body and a shaped charge perforation liner, wherein explosive fills the space between the energetic material liner and the bullet body inner cavity; the top end of the bullet body inner cavity is of an arc-shaped section, and the inner wall of the bullet body inner cavity except the arch-shaped top end is of a reducing step shape; the energetic material liner and the shaped charge perforation liner are of a single-taper angle variable-wall thickness structure; and the outer taper angle of the top end of the shaped charge perforation liner is the same as the inner taper angle of the top end of the energetic material liner.

Description

technical field [0001] The invention relates to the technical field of supporting equipment for mine construction, in particular to a perforating charge for improving the flow guiding capacity of a tunnel. Background technique [0002] As the most commonly used completion technology for oil and gas well exploration and development in this field at home and abroad, the energy-concentrating perforation technology crushes the liner through the energy-gathering effect (also called the Monroe effect) produced by the detonation of explosives, thereby converging on its axis to form a well. The high-temperature, high-pressure, and high-speed energy-gathering metal jet penetrates the perforating gun, casing, cement sheath and penetrates into the oil and gas production layer to form a circulation channel (ie, perforation tunnel) that communicates the wellbore and the oil and gas production layer. However, the inventors found that the inner wall of the perforation tunnel formed by the ...

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Problems solved by technology

However, the inventors found that the inner wall of the perforation tunnel formed by the existing energy-concentrating perforation process is easily formed after being eroded by high-temperature (2000∼5000°C) and high-pressure (thousands to tens of thousands of MPa) metal jets. The inner particles are broken, the number of large particles decreases, and the small debris between particles increases greatly. The large pores with good connectivity will be replaced by a large number of small pores. Many pore throats are blocked by rock debris, and the average porosity drops to about 90%. The permeability drops to about 30%; in addition, the high-speed energy-gathering metal jet will penetrate the formation to form pores, and the low-speed jet is not enough to expand the pores, resulting in the blockage of the pestle in the pores

The formation of perforation compaction zone and pestle solid phase plugging increases the flow resistance of formation fluid to the wellbore, thus seriously reducing the original productivity of oil and gas wells

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