8results about How to "Guarantee mining safety" patented technology

The invention discloses a fire preventing and extinguishing method for a large goaf of a coal-pillar-free island working face, and belongs to the field of working face fire preventing and extinguishing. A fire preventing and extinguishing method for a large goaf of a coal-pillar-free island working face comprises the steps that before working face stoping, the CO concentration of the goaf is detected in the modes of real-time online monitoring, regular manual detection and gas sample chromatographic analysis, and early warning is conducted on potential fire hazards; according to the concentration of CO in the air, a pressure-equalizing air control technology, a goaf guniting and leaking stoppage technology, a goaf grouting and nitrogen injection technology, a stopping agent spraying fire prevention and extinguishing technology or a combination of multiple technologies are adopted for prevention and control. Corresponding measures are taken according to the CO concentration of the goaf, on the premise that the mining safety of the working face is guaranteed, excessive prevention and control are avoided, waste of resources is reduced, the economical efficiency of coal mine enterprises is guaranteed, and the safety and the economical efficiency in the working face stoping process are both considered.

The invention relates to a natural gas hydrate generation inhibitor for deepwater shaft working fluid as well as a preparation method and application thereof. The natural gas hydrate inhibitor SYZ-3 provided by the invention is synthesized by taking a monomer containing a cyclic functional group and a monomer containing a chain functional group as raw materials, azodiisobutyronitrile as a free radical polymerization reaction initiator and dimethylformamide as a free radical polymerization reaction solvent through free radical polymerization reaction. The natural gas hydrate inhibitor SYZ-3 provided by the invention can effectively inhibit secondary generation of hydrates in a shaft, and also can reduce the requirements of a sea area natural gas hydrate drilling fluid system on salt and alcohol thermodynamic inhibitors, so that the drilling fluid performance is guaranteed, the shaft is prevented from being blocked, the well control risk is reduced, and the hydrate exploitation safety is guaranteed; the mining work efficiency is improved, and the method has important significance on construction of a sea area natural gas hydrate low-density strong-inhibition drilling fluid system.

The invention discloses a casing deformation and crack slip amount measuring method and a casing deformation adjusting method based on an optical fiber, a DIC and a strain gauge, is applied to the technical field of geological engineering and mechanical monitoring, and aims at the limitation in monitoring fault slip and casing deformation in the prior art. The invention provides a casing deformation and crack slip simulation method based on DIC and strain gauges. Preparing a transparent soil sample by referring to the rock property of the researched stratum, and processing to obtain a standard sample; a standard sample is cut, fault mud is laid on a cutting surface, a strain gauge is arranged near a fault, and an optical fiber sensor on the surface of a sleeve and a DIC technology are combined, so that the deformation behavior of the sleeve in the fault slippage process can be accurately monitored in real time, and the slippage amount, the deformation amount and related mechanical parameters can be obtained. The multi-technology fusion monitoring method provides a high-precision and high-efficiency solution for dynamic monitoring and analysis of mechanical behaviors of the casing, and has important significance for optimizing casing design and improving safety of mining engineering.

The invention relates to the technical field of mine management and control, and particularly discloses an intelligent mine management and control optimization method based on digital twinning. By monitoring and analyzing the geological condition, the microseismic influence, the slope form and the support instability of the monitoring area where the target mine slope is located corresponding to the current monitoring time period and calculating the deformation degree evaluation coefficient of the monitoring area where the target mine slope is located corresponding to the current monitoring time period, the deformation condition of the target mine slope is visually displayed. The problems of complexity, time consumption, labor consumption and the like of periodic patrol and measurement of mine management personnel are effectively solved, subjective errors of mine slope deformation analysis are reduced to a certain extent, the accuracy, reliability and rationality of a mine slope deformation analysis result are ensured, and meanwhile, the mining safety of the mine personnel is effectively ensured.

The utility model relates to a positioning pipe string, in particular to a device capable of realizing directional perforation and fracturing, which solves the problem that the existing positioning pipe string is blocked when being recycled, so that the mining safety is influenced. The slip comprises a slip body and a cone, the conical surface of the outer wall of the cone is matched with a first conical hole in the slip body, when downward force is applied to the cone by a setting tool, the cone moves downwards along the first conical hole, the slip body is expanded in the radial direction, and clamping teeth located on the outer wall of the slip body can be embedded into a sleeve to achieve setting; a second conical hole of the cone is matched with the plugging ball to realize sealing during hydraulic fracturing; an orientation key in the cone is matched with a first positioning groove of the guide gun and a second positioning groove of the perforating gun to realize orientation perforation; the whole device is made of a material which can be dissolved when encountering chloride ions, the whole device is automatically dissolved and does not need to be recycled when a compound containing the chloride ions is put into the casing pipe, clamping stagnation in the recycling process is prevented, and mining safety is guaranteed.

The utility model relates to a clamping plate, in particular to a wellhead safety clamping plate device which is used for being matched with a perforating gun to plug a wellhead and comprises a first clamping plate and a second clamping plate. A U-shaped groove matched with the radial section of the small parallel section of the perforating gun in shape is formed in the first clamping plate, and an opening of the U-shaped groove is located in the outer wall of the first clamping plate; one end of the second clamping plate is provided with an arc clamping opening matched with the radial section of the large-diameter section of the perforating gun in shape. The second clamping plate is arranged at the top of the U-shaped groove in the first clamping plate, after the second clamping plate and the first clamping plate are spliced, the small parallel section of the perforating gun is clamped in the U-shaped groove, and the arc bayonet is attached to the outer wall of the large-diameter section of the perforating gun. The well mouth clamping plate solves the problems that an existing well mouth clamping plate can only shield part of a well mouth, and residues in a tool and a perforating gun used in the operation process still possibly fall into a shaft from the unshielded part, and has the advantages of preventing falling objects from falling into the shaft, being capable of limiting rotation of the whole device and being suitable for different types of well mouths.

This invention discloses a phosphorus slag-based cementitious material, its preparation method, and its application, specifically relating to the field of cementitious materials technology. The cementitious material, by weight, comprises the following components: 60-90 parts phosphorus slag powder; 5-25 parts fly ash; 5-15 parts activator; 0.25-1.5 parts early-strength agent; and 0.2-0.5 parts water-reducing agent; wherein the specific surface area of ​​the phosphorus slag powder is 400-550 m². 2 / kg, particle size (D) 90 The particle size is 20-40 μm; the early-strength agent is selected from at least one of iron salts and aluminum salts. This invention uses phosphorus slag micro-powder with a specific specific surface area as the main substrate, with a high dosage, combined with fly ash, activator, early-strength agent, and water-reducing agent to obtain phosphorus slag-based cementitious materials. By optimizing the physical properties of the phosphorus slag micro-powder and constructing a suitable composite activator-early-strength system, the 28-day compressive strength of the cementitious material reaches over 61.0 MPa, achieving a balance between "high phosphorus slag content" and "high strength".

The application discloses a kind of mine seismic well ground joint monitoring network layout method, using the following steps: determining the area and boundary conditions of the monitored mining area;According to the geological factors and mining technical factors, the underground key area is divided;Establish the underground monitoring system;According to the effective monitoring coverage of ground microseismic sensor, the distribution of underground goaf, the ground monitoring key area is divided according to the direction of coal mining and tunneling;Exploring the bedrock of the ground monitoring area and determining the distribution position of the bedrock in the ground monitoring area;Select the bedrock in step five to establish the ground monitoring system.The underground monitoring system of the application can realize accurate monitoring of multiple parameters, effectively obtain the accurate change of coal rock attachment state, the ground monitoring system can realize large area monitoring on the ground, can cover the scale of mining area, command the overall situation, avoid omission, realize early warning, and ensure the safety of coal mining.