Liquid explosive injection and detonation device for explosion fracturing of oil and gas reservoir

Abstract

The invention discloses a liquid explosive injection and detonation device for explosion fracturing of an oil and gas reservoir. The liquid explosive injection and detonation device comprises a driving unit, a cylinder barrel, a liquid explosive injection and detonation unit, a driving pressure transferring unit, a central steel column, a perforation section elastic sealing unit and a first pressing ring. The driving unit is located in the left end of the cylinder barrel; the cylinder barrel is fixedly connected with the central steel column; the liquid explosive injection and detonation unitis located in the cylinder barrel; the perforation section elastic sealing unit and the first pressing ring are both arranged outside the central steel column in a sleeving mode; and the driving pressure transferring unit is located between the liquid explosive injection and detonation unit and the first pressing ring and penetrates through the junction of the cylinder barrel and the central steelcolumn. After a target perforation section is sealed through the driving unit, a liquid explosive is injected into a stratum in a high pressure mode through a perforation hole channel; and after theexplosive with the required amount is injected into the stratum and the instantaneous state of the injection pressure is maintained, the liquid explosive injected into the oil and gas stratum is automatically detonated immediately, and the oil and gas stratum is internally exploded to be fractured.

Description

technical field [0001] The invention belongs to the technical field of well completion in oil and gas fields, and in particular relates to a liquid explosive injection and detonation device for explosive fracturing of oil and gas reservoirs. Background technique [0002] At present, in the exploitation of oil and gas unconventional shale reserves and other conventional high-quality, dense and low-permeability oil and gas fields, hydraulic fracturing has become a key means to obtain industrial flow during the well completion process. However, the cost of hydraulic fracturing is high, and its cost has accounted for more than 50% of the entire well completion cost, and the cost of fracturing in water-scarce oilfields is even higher. In addition, hydraulic fracturing consumes a lot of water resources and pollutes the environment, causing many negative social impacts; and in some oil and gas fields with complex terrain, it is difficult for large hydraulic fracturing vehicles to m...

AI Technical Summary

Problems solved by technology

[0004] 1. Safety issues: The "explosive fracturing technology of liquid explosives in the formation", which is currently in the research and testing stage, generally adopts the technical process method: using hydraulic fracturing, firstly fracturing the reservoir, and then hydraulic fracturing vehicles , through the wellbore, use a high-pressure pump to press the liquid explosive into the formation of the oil and gas well, and then use the propellant to detonate; this kind of process technology method has complicated operation process, high cost, long operation time, and a large amount of liquid explosive, generally in the range of 1 to 10 Tons range, poor safety and reliability, high safety level requirements for on-site operations, and are prone to major safety hazards; after detonation, there is a relatively high risk of casing damage or deformation, or even serious safety accidents

[0005] 2. The technical problem of safe and instant detonation under the instantaneous state of completing the injection and maintaining the injection pressure is not solved: under the instantaneous state of injecting the liquid explosive into the formation and maintaining the injection pressure, the liquid in the formation fracture thousands of meters deep can be detonated immediately dynamite

If it cannot be detonated immediately under such working conditions, the liquid explosives in the formation cracks and the oil and water in the formation will easily mix and lose, and the liquid explosives will not be fully detonated, resulting in a large amount of explosives remaining in the bottom layer, which will damage the formation. Produce pollution and cause safety hazards to subsequent oil and gas exploitation

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