Delayed Vacuum Negative Pressure Environment-friendly Perforation Device for Compound Perforation

Abstract

The invention relates to a delayed vacuum negative-pressure environment-friendly perforation device for composite perforation, and relates to the technical field of oilfield perforation. The device comprises a composite perforation gun and a negative pressure gun, and further comprises a hydraulic delay device. The hydraulic delay device is connected between the composite perforation gun and the negative pressure gun. The hydraulic delay device structurally comprises a hydraulic delay main body, a primary piston, a secondary delay piston, a tertiary delay piston, an oil seal and a retaining ring A, wherein a through hole in the axial direction is machined in the center of the hydraulic delay body; the retaining ring A is connected to the outer side of the upper end of the primary piston through a pin A; and a step for limiting the lower side of the retaining ring A is arranged on the hydraulic delay body. The device is characterized in that a brand-new delay mechanism based on the hydraulic principle is adopted, and delay is realized by utilizing the conveying process of hydraulic oil. The hydraulic oil of the hydraulic delay device is conveyed between two adjacent oil chambers inthe device, the delay time can be controlled by controlling the amount of the conveyed hydraulic oil, and the delay time is easy to control.

Description

technical field [0001] The invention belongs to the technical field of oil field perforation, and in particular relates to a time-delayed vacuum negative pressure environment-friendly perforation device for composite perforation. Background technique [0002] In the field of oilfield perforation technology, compound perforation and dynamic negative pressure perforation are very popular perforation technologies. The composite perforation technology uses the high-energy gas produced by the combustion of solid propellant to do work in the perforation tunnel and perform high-energy gas fracturing on the geological formation near the wellbore in the perforation section, thereby bringing synergy to conventional perforation. The dynamic negative pressure perforation technology has the same synergistic effect as the compound perforation technology, and it can clean the perforation tunnel and the near-wellbore geological formation after perforation. [0003] During dynamic negative ...

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Problems solved by technology

Because the effect of negative pressure is related to the flow rate and inflow of the inrush liquid, whether it is to replace or compress the air in the negative pressure gun, it will seriously affect the effect of negative pressure formation

[0008] 3. There is no well fluid discharge mechanism on the tail of the negative pressure gun. When the perforating gun and the negative pressure gun are lifted out of the wellhead after perforation, the well fluid in the negative pressure gun inner cavity will be brought to the well site surface, and then Collection and treatment at the well site not only increases the construction process and construction difficulty, but also easily causes environmental pollution at the well site

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