203 results about "Gas formation" patented technology

The invention discloses a deep sea ultra-shallow gas layer drilling shaft multiphase flow obstacle risk prediction method, and relates to the technical field of petroleum and natural gas engineering, and the method comprises the following steps: building a shaft-sedimentary layer heat-force-solid-chemical multi-physics field coupling model and a 3D model, setting initial boundary conditions, and dividing grids; model parameters are input, a finite element method is used for solving a multi-physics field coupling numerical value, and the gas invasion amount and the hydrate blocking rate are calculated; analyzing a gas invasion-migration-pressure evolution mode; researching the secondary generation and deposition characteristics of the hydrate; establishing a risk assessment system based on the parameters to divide risk levels; a historical data verification model is selected, and when the deviation rate exceeds 15%, parameters are optimized and solution is carried out again. According to the method, the defects of traditional single-field analysis are overcome, the multi-phase flow obstacle risk prediction accuracy is improved, intervention guidance is provided, model verification guarantees stability, safe and efficient mining of the deep sea ultra-shallow gas layer is assisted, and related development technology progress is promoted.

The invention provides a compressed air energy storage underground air storage device and a construction method thereof, and relates to the technical field of underground air storage, the compressed air energy storage underground air storage device comprises two air storage layers, the two air storage layers are buried underground in a U shape, the two air storage layers are in butt joint to form a square, a transverse channel is arranged between the two butt joint ends of the two air storage layers, and the transverse channel is communicated with the air storage layers. Compared with the prior art, the U-shaped gas storage layer is separated by the overhaul layer, the first gas inlet pipe and the first gas outlet pipe in each section are communicated with the second gas inlet pipe and the second gas outlet pipe, and under the action of the driving assembly, the gas storage layer is driven by the driving assembly to rotate, so that the gas storage layer can be maintained, and the service life of the gas storage layer is prolonged. The gas charging stage and the gas discharging stage can be independently carried out in each section of gas storage layer, pressure values in other gas chambers cannot be affected, alternate opening and closing can be carried out, gas is charged or discharged according to needs, and the stability of the gas storage layer is kept.

A gas-layer drag reduction system applied to a large ship, and a ship. The gas-layer drag reduction system (100) comprises: a gas supply system (200), a pressure stabilizing system (300), a gas injection system (400), a monitoring system (500), and an intelligent management system (600), wherein the gas injection system (400) is configured to inject a gas into water by means of the bottom of a ship and form a stable gas layer at the bottom of the ship; the monitoring system (500) is configured to monitor operation information, gas state information, navigation environment information, ship state information and gas-layer state information of the gas-layer drag reduction system (100); the intelligent management system (600) is configured to receive feedback signals of the gas supply system (200), the pressure stabilizing system (300), the gas injection system (400) and the monitoring system (500), and send control signals to the gas supply system (200), the pressure stabilizing system (300), the gas injection system (400) and the monitoring system (500); and the intelligent management system (600) is also configured to control the gas-layer drag reduction system (100) to perform signal interaction with a ship system (110), so as to implement intelligent control. Therefore, the gas-layer drag reduction system (100) is suitable for large ships.

The invention belongs to the technical field of coal bed gas detection, and discloses a coal bed exploration logging gas reservoir identification method, which comprises the steps of data acquisition, data preprocessing, gas reservoir preliminary identification, multi-dimensional cross validation, and gas content and development value evaluation. According to the coal seam exploration logging gas reservoir identification method, firstly, association of logging, a rock core and three-dimensional seismic data is established by means of well-seismic calibration on the basis of multi-source data acquisition, then a three-dimensional cross validation closed loop is formed through rock core logging point verification and well-seismic space verification, and the precision of single well local identification is guaranteed through rock core experimental data; according to the method, seismic data are used for checking the spatial suitability of a gas reservoir, a structure height part and a fracture area, the boundary of the gas reservoir is corrected in combination with wave impedance abnormal characteristics, the limitation of traditional single rock core verification is eliminated, it is ensured that the recognition result is highly consistent with a geological structure rule, and accurate parameters are obtained through fusion of rock core actual measurement and logging inversion.

The invention belongs to but is not limited to the technical field of sea area natural gas hydrate research, and discloses a system and a method for analyzing the influence of stratum elements on the reservoir forming-decomposition process of sea area natural gas hydrates. The control effect of formation elements such as lithology, granularity, formation thickness, dip angle and structural form such as wrinkles on distribution characteristics (including BSR, an overlying hydrate layer and an underlying free gas layer) of a static hydrate system and processes such as migration, aggregation or leakage of methane in the migration process of the dynamic hydrate system is researched. Specifically, the control effects of stratum elements on BSR types, high-low amplitude interaction characteristics of the BSR on a section and a plane, heterogeneity distribution of a hydrate layer and a free gas layer in a static hydrate system, methane migration-aggregation-leakage after BSR migration of a dynamic hydrate system and other processes are analyzed.

The invention discloses a method, a system, equipment and a medium for evaluating the gas-bearing property of a water-flooded area, and the method comprises the steps: confirming three pieces of quantitatively measured skeleton information and fluid medium information in a time domain through different minerals and fluid components, and calculating a fast neutron scattering cross section according to pulse neutron logging data; carrying out qualitative identification on the gas reservoir by combining the fast neutron scattering cross section and the stratum hydrogen-containing index; according to the fast neutron scattering cross section, the thermal neutron capture cross section, the hydrogen content index and the respective volume content, a linear equation set is established, and the simultaneous equation set is solved to obtain the content of different fluid components in the stratum. The gas reservoir evaluation method solves the problem that a conventional gas reservoir evaluation method is seriously influenced by detection depth, borehole environment, invasion, low contrast ratio and pore fluid properties, and does not depend on conventional logging curves and electrical characteristics.

The present application relates to the technical field of natural gas hydrate development, and particularly relates to a method and system for identifying and predicting multiphase flow barrier risk of wellbore in ultra-shallow gas layer. The method comprises the following steps: establishing a reservoir model comprising overburden layer, hydrate layer and ultra-shallow gas layer, and constructing a one-dimensional wellbore model coupled with the reservoir model; establishing a reservoir multi-physical field model and a gas-liquid two-phase transport model in wellbore, and constructing pressure coupling source term, mass exchange source term and heat exchange source term between wellbore and reservoir; extracting multiphase flow barrier risk factors of wellbore, and calculating multiphase flow barrier risk index of wellbore by using the multiphase flow barrier risk factors; extracting hydrate secondary generation risk factors, and calculating hydrate secondary generation risk index by combining thermodynamic gating term, gas-water coexistence term and residence time term; and combining the multiphase flow barrier risk index of wellbore and the hydrate secondary generation risk index, and grading and identifying the multiphase flow barrier risk of wellbore along the depth direction and the time direction.

The large-swing high-performance sealing device comprises a shaft piece, a shaft sleeve is fixedly sleeved outside the shaft piece, a kettle opening flange is sleeved outside the shaft sleeve at intervals, and more than two groups of sealing assemblies are stacked between the shaft sleeve and the kettle opening flange along the axial direction; each single sealing assembly comprises a ring seat, an outer sealing ring is pressed between the outer circumferential wall surface of the ring seat and the kettle opening flange, a gap is formed between the inner circumferential wall surface of the ring seat and the shaft sleeve, a polytetrafluoroethylene ring is coaxially pressed on the end surface of the ring seat, and the inner wall surface of the polytetrafluoroethylene ring is tightly attached to the outer wall surface of the shaft sleeve; the gas storage ring is assembled between the two sealing assemblies and is coaxially arranged, a gas nozzle which outwards penetrates through the kettle opening flange and is communicated with an external gas source is assembled on the gas storage ring, a gap is formed between the inner circumferential wall surface of the gas storage ring and the shaft sleeve to form a gas storage space, and gas is stored into the gas storage space through the gas nozzle to form a gas layer; in actual use, the inner wall face of the polytetrafluoroethylene ring is attached to the shaft sleeve and combined with the gas layer to form sealing between the shaft sleeve and the kettle opening flange, gas isolation can be guaranteed, and the sealing structure is particularly suitable for the using situation of a large-swing enamel shaft.

The present application relates to the technical field of oil and gas reservoir development, in particular to a kind of water invasion influence degree quantitative evaluation method of water production gas well, through the overpressure recovery test carried out during oil testing to water production gas well, carry out secondary pressure recovery test, the double logarithmic curve of two pressure recovery tests is superimposed and compared, water invasion into gas layer radius is analyzed, water invasion into gas layer water volume is calculated according to water invasion into gas layer radius, finally, water body size and water invasion replacement coefficient are calculated according to water invasion into gas layer water volume. Through the method, the influence degree of water invasion of water production gas well can be more accurately quantitatively evaluated.

The application relates to an argon pressure maintaining and cooling integrated device for stainless steel pipeline welding, and relates to the technical field of metal material welding, which comprises a welding bin, the outside of the welding bin is provided with an argon pressure maintaining mechanism, the inside of the welding bin is provided with a cooling mechanism, the argon pressure maintaining mechanism comprises a gas storage tank, the outside of the gas storage tank is fixedly connected with a blower, the outside of the blower is fixedly connected to the top of the welding bin, the outside bottom side of the welding bin is provided with a filtering assembly, and the outside of the filtering assembly is fixedly connected to the outside of the gas storage tank. The application has the advantages that through an argon circulation system, the gas storage tank, the blower and the filtering assembly are cooperatively operated, the resource utilization efficiency is improved while the welding quality is ensured, argon is delivered to the welding bin by the blower to form a protective gas layer, oxygen is effectively isolated, oxidation during the welding of the stainless steel pipeline is prevented, and the welding process is efficient, environmentally friendly and economical.

The application relates to a method for decoupling primary-secondary cracking hydrocarbon generation conversion rates of organic matter based on a gold tube hydrocarbon generation thermal simulation-solid product pyrolysis experiment, which comprises the following steps: step 1, kerogen gold tube hydrocarbon generation simulation and solid product rock pyrolysis experiment data acquisition; step 2, parameterized modeling of the kerogen hydrocarbon generation process; step 3, construction of a least square model cooperatively constrained by multi-source experimental information; step 4, optimization solution under the cooperatively constrained condition of multi-source experimental information; and step 5, hydrocarbon generation conversion rate calculation. The application quantitatively characterizes the conversion rate evolution characteristics of each hydrocarbon generation process, and through conversion rate calculation on the cumulative amount of each hydrocarbon generation process obtained by decoupling, the conversion rate evolution law of the kerogen oil generation, gas generation and oil cracking process, the oil cracking gas formation and the unreactive carbon formation process with the change of the maturity can be obtained, and a quantitative basis for fine hydrocarbon generation evaluation is provided.

The utility model provides a reaction furnace and processing equipment, relates to the field of semiconductor or photovoltaic material processing, and solves the technical problem that boron atoms cannot be doped into silicon wafers due to gas leakage of the reaction furnace. The reaction furnace comprises a furnace tube assembly, wherein a first opening of the furnace tube assembly is communicated with a reaction cavity; the first flange assembly is connected with the end, provided with the first opening, of the furnace tube assembly, the first flange assembly is provided with a first gas channel and a second opening, and protective gas can pass through the first gas channel to form a gas curtain at the first opening; the second flange assembly is connected with the first flange assembly, and the second flange assembly is provided with a second gas channel and a third opening; and the furnace door can be connected with the second flange assembly and is configured to seal the third opening. By means of the structure, when the furnace tube assembly leaks, protective gas can be introduced into the first gas channel, the protective gas can form a protective gas layer, and oxygen molecules are prevented from making contact with a product.

This power storage device case (1) is provided with a case body (3) which has a top wall (31), a side wall (32) provided on the outer peripheral edge of the top wall (31), and a flange (33) provided on the outer periphery of the side wall (32), and in which a housing part (35) is provided inside the top wall (31) and the side wall (32). The case body (3) is formed from a molded body of a power storage device exterior material (1). The exterior material (1) includes: a resin base layer (11); a metal foil layer (12) that is laminated on an inner surface side of the base layer (11); a resin heat-resistant gas barrier layer (13) that is laminated on an inner surface side of the metal foil layer (12); and a resin sealant layer (15) that is laminated on an inner surface side of the heat-resistant gas barrier layer (13). The sealant layer (15) is provided with an opening (2) for exposing the heat-resistant gas barrier layer (13) in the housing part (35), and an outer peripheral edge section (21) of the opening (2) is set at the flange (33).

The present application belongs to the field of oilfield gas injection development, and discloses a multi-stage adjustable separate layer gas injection quantitative control method which can realize precise adjustment and control of separate layer gas injection. The multi-stage adjustable separate layer gas injection quantitative control method comprises the following steps: step S1: before the multi-stage adjustable injection device is put into the well, the size of the gas nozzle of the multi-stage adjustable injection device is quantitatively calculated according to the injection allocation range and the gas absorption capacity data of each gas injection layer; step S2: the gas nozzle is processed and customized according to step S1; step S3: the multi-stage adjustable separate layer gas injection device is connected, assembled and put into the well with the hydraulic pipeline, the interlayer packer and the wellhead through sealing, and the ground hydraulic controller is connected; step S4: during the separate layer gas injection process, the injection allocation device is adjusted to the size of the gas nozzle which meets the injection allocation requirement according to the gas absorption capacity test data and the gas nozzle loss chart; and step S5: after the adjustment, the actual gas injection amount of each layer is calculated and interpreted according to the gas absorption capacity test data.

The invention provides a substrate supporting piece, semiconductor film forming equipment and a heating control method, the substrate supporting piece comprises a body and a supporting shaft, the body is provided with a supporting surface used for supporting a wafer, and the body comprises a heating layer, a gas uniformizing layer and a cooling layer which are sequentially arranged from the supporting surface; a vent hole is formed in the supporting surface, extends downwards to penetrate through the heating layer and is communicated to the gas uniformizing layer; the gas uniformizing layer is communicated with an external vacuum pump through a gas channel arranged on the supporting shaft, when the wafer is placed on the supporting surface, the gas uniformizing layer can realize vacuum adsorption of the wafer, and the gas uniformizing layer can form thermal resistance to maintain a preset temperature difference between the heating layer and the cooling layer. According to the embodiment of the invention, the structure and the function of the low-temperature temperature control tray and the structure and the function of the vacuum chuck can be combined, and the wafer is adsorbed and the thermal resistance is changed after the gas uniformizing layer is vacuumized, so that the heating power can be reduced, and the purposes of saving energy, improving the temperature control efficiency and reducing the load of an external cooling device are achieved.

The invention discloses a high-pressure gas circuit breaker nozzle preparation method and a nozzle, which are applied to the technical field of high-pressure circuit breaker structure preparation, and are characterized in that a plurality of preset gradient schemes are simulated by establishing a transient coupling model, and candidate partition gradient schemes including a gas production layer, a corrosion-resistant layer and a transition layer are screened out; therefore, the influence of different partition material distribution on the short-time voltage buildup response and the accumulated damage and interface degradation rate can be directly compared and balanced; and finally, layered preparation is performed in a mold cavity according to the selected partition sequence and the material distribution table, and an original part is activated and enhanced, so that the material gradient and interface conditions obtained through simulation optimization are reproduced and enhanced in a solid part, and therefore, it is ensured that the nozzle has expected rapid pressure building and gas production capacities in the on-off transient stage; and through interlayer bonding and material compactness obtained through engineering manufacturing and interface treatment, the durability in the repeated breaking process is improved.

The invention relates to the technical field of oil and gas reservoir well completion, in particular to a gas storage sand production control method and device. The method comprises the following steps: in a gas storage well completion process, replacing drilling cuttings carried during backflushing by using a dissolvable sand consolidation liquid medicine, and plugging an annulus by using a sleeve and annulus plugging technology; and under the conditions that the gas storage is in a gas storage operation state and the operation pressure of the gas storage reaches a packer under-pressure operation pressure threshold value, the gas storage is controlled to perform well opening and gas discharging, and an oil pipe gas layer is sealed through the packer to achieve a layered injection and production operation system. By the adoption of the scheme, the sand production prevention and control facility of the gas storage can be completed during well completion.

The utility model relates to the technical field of compressor sealing, in particular to a sealing assembly for an industrial gas compressor, which comprises a compression cylinder and a sealing assembly, a sealing assembly is mounted outside the extending side of the main shaft; the sealing assembly comprises a rotating cylinder, a sealing ring and an automatic valve; a sealing ring is arranged in the rotating cylinder; a gas storage layer is arranged between the rotating cylinder and the sealing ring; an exhaust channel is arranged in the cylinder wall of the rotating cylinder; the exhaust channel comprises an exhaust port, a buffer channel and a connecting cavity; the connecting cavity is communicated with the gas storage layer; an automatic valve and an annular positioning block are arranged in the connecting cavity; the annular positioning block is fixedly arranged on the inner wall of the connecting cavity; the automatic valve is slidably mounted in the middle of the annular positioning block; the automatic valve comprises a valve core and a restoring spring; a fixing ring is arranged at the end of the valve element. According to the device, the situation that the main shaft is overheated due to pressure building caused by dead air can be avoided, and therefore the sealing effect of the compressor is improved.

The application discloses a kind of fluid identification method and system of water-saturated hydrogen index contrast method, calculate reservoir matrix porosity;Electric imaging and double lateral data are combined to calculate rock fracture porosity, and sum matrix porosity to total porosity;Assume that bedrock reservoir pore is water-saturated, select the dynamic skeleton neutron value of the dense layer section of lowest porosity, high resistivity dynamic skeleton as fixed skeleton value, calculate the dynamic skeleton neutron value of the purpose layer in combination with total porosity;According to dynamic skeleton neutron value, calculate water-saturated hydrogen index of research interval;Water-saturated hydrogen index is compared with neutron actual logging value to calculate neutron difference value;In combination with gas production test data, the relationship between acoustic time difference and neutron difference value and the change relationship between matrix porosity and neutron difference value are analyzed using neutron difference value, and the relationship chart of quantitative identification gas-water layer is obtained.The method eliminates the influence of anisotropy, fracture occurrence and the like of bedrock lithology, highlights the characteristics of reservoir gas layer, and can more accurately identify the properties of reservoir fluid.

The invention discloses a commingling production capacity prediction method for a multi-layer-section transformed gas well, and the method comprises the specific steps: 1, obtaining gas reservoir parameters of each gas layer of the gas well, and calculating the gas well single-layer capacity of each layer of the gas well according to the gas reservoir parameters of each layer of the gas well; 2, establishing a numerical simulation mechanism model according to the geological data of the gas well, and fitting an interference coefficient according to the numerical simulation mechanism model; 3, the lower economic limit of the productivity is determined, the layer position with the single-layer productivity higher than the lower economic limit of the productivity of the gas well is screened out, and the layer position for commingling production is obtained; and 4, predicting the commingling production capacity by adopting a commingling production capacity calculation formula according to the horizon for commingling. Simulation better conforms to the actual production process of the gas well, the layered units are averaged, the influence of heterogeneity in the reservoir on the calculation result is eliminated, and commingling production capacity predicted through the interference coefficient is more accurate.

This invention provides an experimental apparatus and method for simulating the phase state of fluids in oil and gas reservoirs, belonging to the field of experimental technology for fluid phase state in oil and gas field development. It includes: a support frame with a first cavity, a second cavity, and a third cavity arranged from top to bottom; a pressure regulating mechanism for adjusting pressure is installed in the second and third cavities; the first cavity is connected to the second cavity via a first pipe and a second pipe, and the first cavity is connected to the third cavity via a third pipe; the second cavity is connected to the third cavity via a fourth pipe; an output pipe is located at the top of the first cavity, with the inlet of the output pipe located inside the first cavity and lower than the opening of the first pipe on the first cavity; valves for controlling the opening and closing of the output pipe, the first pipe, the second pipe, the third pipe, and the fourth pipe are all installed. This invention has a simple structure, is easy to use, and can accurately simulate the depletion development process of oil-bottom-water type oil and gas reservoirs in upper gas formations, clearly defining the phase change characteristics of formation fluids.

To provide a carbon dioxide liquefaction system which can minimize energy required for liquefaction of carbon dioxide.SOLUTION: A carbon dioxide liquefaction system 1 has a liquefied carbon dioxide drum 10, a liquefied carbon dioxide circulation line, a liquefied carbon dioxide pump 20, a liquefied carbon dioxide cooler 30, an ejector 40 which is disposed in a flow in the rear of the liquefied carbon dioxide pump 20 in the liquefied carbon dioxide circulation line and functions with liquefied carbon dioxide output from the liquefied carbon dioxide pump 20 as a drive fluid and carbon dioxide containing gas as a suction fluid, a carbon dioxide containing gas receiving line 75 through which the ejector 40 receives the carbon dioxide containing gas, a liquefied carbon dioxide output line 78, a recycled gas line which reflux gas of a gas layer in the liquefied carbon dioxide drum 10 to the carbon dioxide containing gas receiving line 75, a carbon dioxide separation membrane 50 which is disposed in the recycled gas line and concentrates the carbon dioxide of the gas layer in the liquefied carbon dioxide drum 10, and a recycled gas flow control valve 83.SELECTED DRAWING: Figure 1

The invention relates to the technical field of geophysical exploration, in particular to a pre-stack AVO gas-bearing prediction method based on a TK energy operator, and the method comprises the steps: applying a one-dimensional TK energy operator to a pre-stack seismic gather channel by channel for calculation; the first channel of the channel set is taken as a reference, the energy difference between each channel and the first channel is calculated by adopting a CTKEO cross-correlation energy operator, and the AVO abnormal feature recognition capability is enhanced; extracting an intercept-gradient attribute of least square fitting on the processed gather; and delineating a gas reservoir distribution area on a PG profile by combining gas-bearing response characteristics of well logging data in a well, and finally generating a gas-bearing indication profile or a three-dimensional attribute body for depicting spatial distribution characteristics of a gas reservoir. According to the method, the instantaneous energy change of the gas-containing layer signal is finely described through the one-dimensional TK energy operator, the weak signal recognition capability is remarkably improved, the AVO abnormal characteristics are enhanced through cross-correlation of the CTKE mutual energy operators, and the gas layer and the water layer are effectively distinguished; the resolution ratio of an intercept-gradient attribute profile extraction result is higher, and the top and bottom boundaries of the gas reservoir can be accurately calibrated.

The utility model discloses a bubble generating device for an air lubrication resistance reduction ship, and belongs to the technical field of ship resistance reduction. The device comprises a main air cavity, a side air cavity and an exhaust chamber which are arranged on a bottom plate, the main air cavity is formed in the bottom plate, the top of the main air cavity communicates with external air supply equipment through an air inlet, side air cavities are symmetrically formed in the left side and the right side of the main air cavity correspondingly, and the main air cavity communicates with the side air cavities through internal communicating holes. The exhaust chamber is an open cavity positioned below the main air cavity and can be in direct contact with water flow; the head end of the exhaust chamber is communicated with the main air cavity through an upper air vent, and the two sides of the exhaust chamber are communicated with the two side air cavities through side air vents respectively. A gas storage cover plate is arranged at the bottom of the head end of the exhaust chamber. The side face of the ventilation generating device is provided with the side air cavity, after ventilation, the main air cavity penetrates out of the continuous air layer from the upper ventilation opening, the side air cavity can evenly generate stable bubbles which serve as supplementary bubbles of the continuous air layer penetrating out of the upper ventilation opening, and the air layer is more even.

The invention discloses a positive cycle non-linear displacement control method for strong drilling of a sulfur-containing and gas-containing stratum, which belongs to the technical field of displacement control methods and comprises the following steps of: measuring the static liquid level height of a drilling fluid column before a drilling pump is started under the condition of leakage return of a drilled well; measuring the working fluid level height after well drilling pump starting is stable; calculating the liquid column pressure before pump starting according to the static liquid level height of the drilling liquid column; calculating formation pressure after pump starting is stabilized according to the working fluid level height; comparing whether the liquid column pressure before pump starting and the formation pressure after pump starting stabilization are balanced or not; if not, the annulus dynamic liquid level height is adjusted, the annulus liquid column pressure is kept equal to or larger than the formation pressure all the time, and the annulus liquid column pressure is made to stably press the leakage layer; and after the leakage layer is stably pressed, clear water with different discharge capacities is adopted to bring drilled rock debris into the leakage layer under different annular gaps of the drill collar section and the drill rod section. In the process of clear water forced drilling, the height of the annular liquid level above a leakage layer is controlled through positive circulation, so that the annular liquid column pressure is larger than the formation pressure, and an air layer is stably pressed to prevent overflow.

The present application relates to a kind of temporary plugging agent of velvet capsule, belong to oil and gas field chemical technical field.The temporary plugging agent of velvet capsule of the present application includes basic compound and following mass fraction of each component: water 100 parts, capsule layer agent 1.5~2.5 parts, velvet agent 0.8~1.5 parts, nucleating agent 0.2~0.8 parts, film forming agent 0.4~1 part, high temperature stabilizer 0.8~1.5 parts.The temporary plugging agent of the present application is temporary plugging agent of velvet capsule, with good high temperature stability, due to its unique velvet capsule structure, the pressure capacity under 150 DEG C can reach more than 19.8MPa, with excellent sealing performance, can meet the requirement of carbonate rock low pressure gas layer plugging.The solid content of the temporary plugging agent of the present application is low, the gel breaking rate can reach more than 98.85%, the permeability recovery rate to seamless core can reach more than 87.56%, and the reservoir protection performance is excellent.

The present invention relates to a gas barrier coating composition comprising a metal oxide and a phosphoric acid compound. A polyvalent metal carboxylate soluble in phosphoric acid is added to the metal oxide and the phosphoric acid compound to provide a coating composition and a gas barrier laminate having the gas barrier coating film (gas barrier layer). The coating composition can form a gas barrier coating film having excellent oxygen barrier properties, water vapor barrier properties, and transparency without volatilizing an inorganic acid.

The utility model relates to the technical field of coal, in particular to a coal bed gas reservoir pulverized coal monitoring device which comprises a square cylinder, the square cylinder is communicated and fixed to a water inlet pipe of a pump, a first cylinder is communicated and fixed to the square cylinder, a first sealing plate is inserted into the first cylinder, and a guide pipe is arranged on the first sealing plate in a penetrating and sliding mode. A circular ring is fixed to the guide pipe in a penetrating mode, the circular ring makes contact with the first sealing plate, a monitoring probe and a controller are fixed to the two ends of the guide pipe respectively, a wire is fixed between the controller and the monitoring probe, the wire penetrates through the guide pipe, and the monitoring probe is inserted into the square barrel. When the device is used, the monitoring probe is used for monitoring the content of pulverized coal at the gas production port of the gas storage layer, so that a worker can timely find the situation that the content of the pulverized coal at the gas production port of the gas storage layer is increased suddenly and can timely process the situation, and the phenomenon that a gas production channel is disturbed and blocked can be avoided.

The utility model relates to the technical field of ships, in particular to a marine antifouling device based on air layer resistance reduction, which comprises an air pipe, the air pipe comprises an air inlet and an air outlet, the cross section area of the air inlet is smaller than that of the air outlet, the air inlet is connected with a high-pressure air source, and the air outlet is connected with an air nozzle. The gallipot is used for containing a solid or gaseous marine organism repelling agent, and the gallipot is communicated with the air pipe through a supply pipe; a switch is arranged on the supply pipe and can adjust the size of an opening of the switch; a flow valve is arranged between the air pipe and the high-pressure air source and used for adjusting the flow of air entering the air pipe. The supply pipe is communicated with air cannons on the front side and the rear side of the switch.

This invention discloses an optimization method for flowback nozzles in deep coal and rock gas formations, considering the influence of multiple factors, belonging to the field of coal and rock gas extraction technology. Addressing the challenge of flowback fluid velocity control in deep coal and rock gas development, this method establishes models for matrix and fracture seepage and two-phase flow within the wellbore. It comprehensively considers the migration of pulverized coal and proppant, as well as the influence of coal seam cleavage fractures, to optimize wellhead nozzle size, reduce the probability of pulverized coal clogging fractures, and improve fracture conductivity. Compared to traditional methods, this invention has significant advantages in improving fracturing efficiency and high-efficiency coal and rock gas extraction, providing an innovative solution for the scientific research and engineering applications of deep coal and rock gas.