Liquid explosive with small critical diameter and medium detonation velocity and preparation technology thereof

Abstract

The invention discloses a liquid explosive with a small critical diameter and medium detonation velocity and a preparation technology thereof. The liquid explosive is composed of the following components in percentage by weight: 60 to 90% of nitromethane, 3 to 10% of sensitizing agent, 5 to 20% of performance buffering agent, and 2 to 10% of complexing agent. The liquid explosive has the following characteristics: (1) the mechanical sensitiveness is low, and the operation is safe; (2) the detonation is reliable, the critical diameter is small, and the energy is proper; (3) the fluidity is good, and thus the liquid explosive is suitable for long distance pumping; (4) the whole system is in a weak alkali state and is non-corrosive to metals; (5) the preparation method is simple, the price is low, and the liquid explosive can be mixed onsite before using. The liquid explosive is applied to oil and gas exploitation and is especially suitable for oil and gas exploitation in low permeable hard rock areas.

Description

technical field [0001] The invention belongs to an industrial explosive formula and a preparation process thereof, in particular to a liquid explosive with a small critical diameter and a medium detonation velocity used in the development of oil and gas reservoirs and a preparation process thereof. Background technique [0002] After decades of extensive exploitation of oil and gas resources in my country, the amount of conventional oil and gas resources has been greatly reduced, and the exploitation of low-permeability oil and gas reservoirs has become the main battlefield for oil and gas exploration in my country. [0003] In the production process of low-permeability oil and gas reservoirs, due to the relatively insufficient natural energy of oil and gas, the rate of production decline is very fast. Low-permeability oil and gas without stable performance has very low conductivity, and the production of oil wells decreases day by day. For oil and gas wells with low or shut...

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Problems solved by technology

[0005] (2) Low mechanical sensitivity and safe operation;

Among them, U.S. Patents US3747679, US4038112 and US3663324 all use high-energy explosives such as Hessogen as sensitizers. Although it is beneficial to reduce the diameter of the explosion, it causes the detonation velocity of the system to be too high, and the rock is easy to form a compacted and crushed area, and the reservoir seeps Sexual decline

In addition, as the main military explosive, RDX has high sensitivity and high price, and is not suitable for industrial applications; Chinese patent CN200410026187.9 uses liquid gunpowder to fracturing oil and gas layers, and the loading speed is slow, but the critical diameter is high and the detonation The method is complicated and the reliability is poor; the Chinese patent CN94110815.5 discloses a liquid explosive based on nitric acid, the preparation method is simple and the price is low, but the system is strongly acidic and highly corrosive to metal instruments such as shafts and casings. The maintenance cost is high; the explosive velocity in the Chinese patent CN85103188 is low, but some components of the explosive, such as methyltriol trinitrate, diethylene glycol dinitrate, nitroglycerin, etc., have scarce raw materials and are expensive; in the Chinese patent CN85102869 The announced cold-resistant liquid uses hydrazine nitrate and hydrazine hydrate as raw materials, has high detonation velocity and high power, and is not suitable for oil and gas reservoir development.

[0010] It can be seen that the existing liquid explosive varieties are either composed of simple explosives (such as RDX, nitroglycerin), which have high cost and poor safety; or are solvents such as nitric acid, which are highly corrosive; high cost, etc.

At the same time, there are no varieties with medium detonation velocity and small critical diameter in the existing liquid explosives, which cannot meet the needs of oil and gas reservoir development

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