Pipeline perforation delay dynamic negative pressure device

Abstract

A pipe-transported perforation delay dynamic negative pressure device, which relates to the field of oil field perforation technology, includes a perforating gun, a time delay switch and a negative pressure cylinder, the three are connected sequentially from top to bottom, and the upper end of the perforating gun is connected with a seal The two ends of the negative pressure cylinder are sealed with packers, so that all the negative pressure acts on the perforation section after the delay switch is opened, and the side wall of the negative pressure cylinder is processed with pressure holes connecting the inside and outside. All the vacuum pumps in the column are connected in series through pressure pipelines, and a vacuum pump is installed above the uppermost perforating gun. Pump to negative pressure. The invention solves the problem in the prior art that the suction of well fluid in the negative pressure space is not highly targeted, avoids ineffective losses, further expands the negative pressure space, and improves the removal effect of fine particles in the perforation tunnel.

Description

technical field [0001] The invention belongs to the technical field of oil field perforation, in particular to a pipeline transport perforation delay dynamic negative pressure device. Background technique [0002] In the field of oilfield perforation technology, the composite perforation technology uses the high-energy gas produced by the combustion of solid propellant to perform work in the perforation tunnel and high-energy gas fracturing of the geological formation near the wellbore in the perforation section, thereby reducing the impact of conventional perforation. Synergy. Dynamic negative pressure perforation technology is a new method of cleaning the perforation tunnel after perforation. In the technical development of oil and gas well completion, the reason why the dynamic negative pressure perforation technology can greatly reduce the perforation damage is mainly because the negative pressure difference is rapidly formed in the wellbore after perforation, that is, ...

AI Technical Summary

Problems solved by technology

[0004] First, the general structure of the existing compound perforation and dynamic negative pressure perforation combined tool includes a perforating gun and a negative pressure cylinder, and a mechanical stroke delay switch for opening the negative pressure cylinder is arranged between the two. After the switch is turned on, not only the well fluid in the injection section will enter the negative pressure cylinder, but the well fluid in other sections will also be sucked into the negative pressure cylinder by negative pressure. Loss

[0005] Second, the space of the negative pressure cylinder is limited and cannot be extended indefinitely, so the high-amplitude reflow time generated by dynamic negative pressure is relatively short

[0006] Both of the above two defects lead to the inability to effectively remove the well fluid particle contamination and the compaction zone of the hole wall in the perforation tunnel.

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