Supercritical oxygen fracturing device

Abstract

The invention discloses a supercritical oxygen fracturing device which comprises an expansion pipe and a gas-inflated ignition head. A necking port in one end of the expansion pipe is sealed, and a necking port in the other end of the expansion pipe is provided with the gas-inflated ignition head. A necking port machining method comprises the steps that the expansion pipe is fixed through a clamp, the clamp is used for rotating the expansion pipe and heating one end of the expansion pipe, the end of the expansion pipe is heated till being approximate to or reaching plastic deformation, the front portion of a necking mold makes contact with the end of the expansion pipe, the end of the expansion pipe moves from the front portion to the tail of the necking mold, the necking mold carries out extrusion thickening molding on the end of the expansion pipe, a through hole knife is used for forming a through hole in the end of the expansion pipe and fixing the hole diameter, the steps are repeated to carry out extrusion thickening molding on the other end of the expansion pipe, a through hole is formed, and the hole diameter is fixed, or sealing thickening molding is carried out. A pressure container is prepared from the expansion pipe through the necking port machining method. The supercritical oxygen fracturing device has the advantages that the structure is simple, the structural components are easy to machine, the manufacturing cost is low, head flying and gas leakage are avoided, conveying is safe, no dud hidden danger exists, and expansion force is large.

Description

technical field [0001] The invention belongs to the technical field of expanders, in particular to a supercritical oxygen cracker. Background technique [0002] Existing gas crackers (crackers) are hereinafter referred to as expanders, such as: CN201611099345.2, CN201520283079.3, CN201510489513.8, CN201510556527.7 The connection part usually adopts the thread method (the thread needs to be machined) or welding method or butt welding No matter which method is used for manufacturing, there will be weak points in the connection between the inflation head, the energy dissipation head and the expansion tube, which will cause the connection part to crack first when the expander expands, and the flying head will appear. [0003] The existing expander (cracker) still has technical problems of many components and complex processing and assembly process of each component. [0004] For example, the patent document with the notification number CN205858345U discloses "plug, expansion tu...

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Problems solved by technology

[0002] Existing gas crackers (crackers) are hereinafter referred to as expanders, such as: CN201611099345.2, CN201520283079.3, CN201510489513.8, CN201510556527.7 The connection part usually adopts the thread method (the thread needs to be machined) or welding method or butt welding No matter which method is used for manufacturing, there will be weak points in the connection between the inflation head, the energy dissipation head and the expansion tube, which will cause the connection part to crack first when the expander expands, and the flying head will appear.

[0003] The existing expander (cracker) still has many components, and the technical problems of complex processing and assembly processes for each component

[0004] For example, the patent document with the notification number CN205858345U discloses "plug, expansion tube, activator, liquid filling hole and lock valve, the plug is provided with an activator installation port, and the plug or expansion tube is provided with a liquid filling hole." ", although it saves a lot of parts and assembly steps compared with other expanders, there are still two processings at both ends of the expansion tube, that is, one end needs to be welded during assembly, and the other end needs to be threaded and sealed, or both ends are connected by welding. The welding master's technical level is extremely high. Less than 20% of the joints are welded with a constant thickness and no gaps. Thread processing, the two ends of the expansion tube after thread processing are weaker than the unprocessed tube body, so that there is a whole circle of weak points in the connection between the plug and the expansion tube, because there are stress weak points in the connection, and the use of plugs (full When the plug (filling head or discharge head) is threaded, the diameter of the plug (filling head or energy-discharging head) is slightly smaller than the diameter of the expansion tube body, resulting in a large force-bearing surface of the plug, a large volume, and a heavy weight. Cracks and flying heads

[0012] The expansion principle of the existing carbon dioxide expander is to energize the activator, and the electric heating wire in the activator generates heat to ignite the mixture composed of strong oxidants such as potassium perchlorate and strong reducing agents such as aluminum powder to generate high-temperature heat. Due to the constraints of the expansion tube, High-temperature heat will be absorbed by the liquid carbon dioxide in the expansion tube. The entire heat absorption process is over 400ms. The greater the yield strength of the expansion tube, the longer the heat absorption and expansion time. When the expansion pressure of gaseous carbon dioxide is greater than the tensile strength of the expansion tube , the gaseous carbon dioxide breaks through the binding force of the expansion tube to do work, and the expansion tube will lose more than 20% of the expansion force

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