CN-121994083-A - Explosion-enhanced gas fracturing pipe and operation method thereof

CN121994083ACN 121994083 ACN121994083 ACN 121994083ACN-121994083-A

Abstract

The invention provides a blasting enhancement type gas cracking tube and an operation method thereof, wherein the blasting enhancement type gas cracking tube comprises a gas cracking tube body and a constraint enhancement layer, the gas cracking tube body is of a two-layer structure sleeved inside and outside, the strength of materials of the inner layer is higher than a set value, the outer layer and the constraint enhancement layer are integrally arranged, vacuum is arranged between the inner layer and the outer layer, the constraint enhancement layer is formed by weaving materials with certain strength, a weakening area is arranged, the weakening area corresponds to a preset blasting force concentration area, the weaving density or the material strength or the material size of different areas are different, the constraint force formed by the weakening area is smaller than that of other areas, an asymmetric constraint field is formed, detonation waves are forced to radially diffuse, and a plurality of crack guide grooves are arranged on the tube wall of the inner layer and correspond to the weakening area. According to the invention, through the design of the multi-layer composite pipe body structure, a bidirectional constraint structure can be formed, stress is concentrated in a preset blasting direction, and axial blasting dispersion is reduced, so that the hole blocking amount is reduced, the directional blasting energy utilization rate is improved, the structure is simple, and the installation efficiency is improved.

Inventors

LI BIAO
LIN CHUNJIN
REN KEYAO
WANG YAXU
YANG RUI

Assignees

山东大学

Dates

Publication Date: 20260508
Application Date: 20260310

Claims (10)

1. The explosion enhanced gas cracking pipe is characterized by comprising a gas cracking pipe body and a constraint enhancement layer, wherein the gas cracking pipe body is of a two-layer structure sleeved inside and outside, the strength of the material of the inner layer is higher than a set value, the outer layer and the constraint enhancement layer are integrally arranged, and vacuum is arranged between the inner layer and the outer layer; The constraint enhancement layer is formed by weaving materials with certain strength, and is provided with a weakening area, the weakening area corresponds to a preset blasting force concentration area, the weaving density or the material strength or the material size of different areas are different, the constraint force formed by the weakening area is smaller than that of other areas, an asymmetric constraint field is formed, and detonation waves are forced to radially diffuse; And a plurality of crack guide grooves are arranged on the pipe wall of the inner layer at positions corresponding to the weakening areas.
2. A blast-enhanced gas fracturing pipe according to claim 1, wherein said inner layer is an alloy pipe having a strength higher than a set value.
3. A blast-enhanced gas fracturing pipe according to claim 1, wherein said braided material of said containment-enhancing layer is steel wire or alloy wire.
4. A blast-enhanced gas fracturing pipe according to claim 1, wherein said weakened zone is provided at an intermediate position of the gas fracturing pipe body.
5. A blast-enhanced gas fracturing pipe according to claim 4, wherein said weakened zone of braided material has a lower strength than the braided material in other areas.
6. A blast-enhanced gas fracturing pipe according to claim 4, wherein said weakened zone has a material thickness or diameter which is smaller than the material thickness or diameter of the other zones.
7. A blast-enhanced gas fracturing pipe according to claim 4, wherein said weakened zone has a lower braid density than the other zones.
8. The explosion-enhanced gas cracking tube according to claim 1, wherein the crack guiding groove is of a V-shaped or U-shaped structure, is arranged along the radial direction of the gas cracking tube body, and has an opening facing the inner side of the gas cracking tube and a closing facing the outer side of the gas cracking tube.
9. A method of operating a blast enhanced gas fracturing pipe according to any of claims 1 to 8, characterised in that it comprises the steps of: Plugging the explosion enhancement type gas cracking pipe into a pre-drilled explosion hole; injecting liquefied gas into the explosion enhancement type gas cracking tube for detonation ignition; The constraint force formed by the corresponding constraint enhancement layers at the preset explosion force concentration areas is smaller than that of other areas, the pipe wall of the gas induced cracking pipe inner layer is provided with a crack guide groove at the position, the explosion force is induced to be released directionally, and the explosion force is released intensively to the preset explosion force concentration areas, so that directional explosion is realized.
10. The method of claim 9, wherein when the constraint reinforcement layer is a steel wire layer, the blast power prediction model is: Wherein: F is directional blasting resultant force, and the unit is N; k is the structural coefficient of the tube body, and is calibrated through experiments; E is the elastic modulus of the steel wire, and the unit is Pa; n is the number of steel wires in unit length of the non-weakened area, and the unit is root/m; d is the diameter of the steel wire, and the unit is m; l is the effective constraint length of the steel wire, and the unit is m; P 0 is the initial expansion force of the gas, and the unit is Pa; is a correction coefficient; A is the radial total cross-sectional area of the designed primary steel wire, and the unit is m2.

Description

Explosion-enhanced gas fracturing pipe and operation method thereof Technical Field The invention belongs to the field of underground engineering and geotechnical engineering equipment, and particularly relates to a blasting reinforced gas cracking pipe and an operation method thereof. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. The traditional gas cracking pipe (also called a static breaker) mainly generates slow release blasting force through chemical expanding agent or high-pressure gas, and is widely applied to the scenes such as mining, concrete demolishing and the like. The prior art mainly has three major bottlenecks, namely, a common metal pipe body is prone to random fragmentation under the action of high pressure, the blasting direction is uncontrollable, the energy utilization rate is lower than 40%, dangerous flying stones are easy to generate, the strength of the pipe body can be improved by adopting a homogeneous reinforcing layer, the detonation pressure threshold value can be obviously improved, about 20% -30%, the integral rupture of the pipe body is caused, and thirdly, the research of the 26 th roll of China engineering blasting 2020 shows that the conventional directional blasting technology depends on an external guiding device, such as an energy gathering cover or a constraint plate, the construction cost is increased by more than 30%, and the installation efficiency is reduced by 50%. In recent years, although students have tried to improve the orientation by grooving the pipe body, stress concentration is likely to occur at the weakened portion of the pipe body, and the pipe body is subjected to premature explosion when the working pressure is not reached. In addition, in practical application, the plugging length of part of the existing gas cracking pipes is too long, so that the installation flow is complex, the construction efficiency is low, and many scenes are not applicable. Disclosure of Invention In order to solve the problems, the invention provides a blasting enhancement type gas cracking tube and an operation method thereof, the invention can form a bidirectional constraint structure through the design of a multi-layer composite tube body structure, and concentrate stress in a preset blasting direction, the invention increases the explosion force in the hole by restraining, reduces the plugging length, realizes quick plugging, quick installation and quick explosion. According to some embodiments, the present invention employs the following technical solutions: The explosion enhanced gas cracking pipe comprises a gas cracking pipe body and a constraint enhancement layer, wherein the gas cracking pipe body is of a two-layer structure sleeved inside and outside, the strength of the material of the inner layer is higher than a set value, the outer layer and the constraint enhancement layer are integrally arranged, and vacuum is formed between the inner layer and the outer layer; The constraint enhancement layer is made of a material with certain strength The detonation wave radial diffusion device is formed by braiding, and is provided with a weakening zone, wherein the weakening zone corresponds to a preset blasting force concentration zone, braiding densities or material strengths or material sizes of different zones are different, constraint forces formed by the weakening zone are smaller than constraint forces of other zones, an asymmetric constraint field is formed, and detonation waves are forced to radially diffuse; And a plurality of crack guide grooves are arranged on the pipe wall of the inner layer at positions corresponding to the weakening areas. Alternatively, the inner layer is an alloy tube with a strength higher than a set value. Alternatively, the braiding material of the constraint reinforcing layer is steel wire or alloy wire. As an alternative embodiment, the weakened zone is arranged in the middle of the gas fracturing pipe body. As a further embodiment, the strength of the woven material of the weakened zone is lower than the strength of the woven material of the other zones. As a further embodiment, the weakened zone has a material thickness or diameter that is less than the material thickness or diameter of the other zones. As a further embodiment, the weakened zone has a lower braid density than the other zones. As an alternative embodiment, the crack guiding groove has a V-shaped or U-shaped structure, is radially arranged along the gas cracking tube body, and has an opening facing the inner side of the gas cracking tube and a closing facing the outer side of the gas cracking tube. The operation method based on the explosion enhanced gas cracking pipe comprises the following steps: Plugging the explosion enhancement type gas cracking pipe into a pre-drilled explosion hole; injecting liquefied gas into the explosion enhancement type gas