Abstract: A star rating management method for deployment and implementation of gas field development wells first establishes the expression for estimating the gas well initial production rate and the dimensionless production curve; then determines the annual production of the new well for every year during the evaluation period and determines the internal rate of return of the new gas well. If the internal rate of return fails to meet the requirement, the deployment location and construction technology of the new well are re-optimized. Corresponding stars rating are determined according to the internal rate of return of the gas wells. The new well is drilled according to the deployment location that can meet the economic benefit requirements. After the gas well is drilled, a more detailed fracturing design is carried out, and the internal rate of return of the gas well and the star rating of development benefit are redetermined.

Abstract: The present disclosure provides a slush machine, including a fixation assembly, an enclosure assembly, a stirring assembly, a refrigeration assembly, and a discharge assembly, where the stirring assembly comprises a support rack and a stirring mechanism provided on the support rack; the stirring mechanism comprises a protective housing, a drive motor, and a scraper; the refrigeration assembly includes an evaporator; the discharge assembly includes a storage housing and a discharge cartridge; the storage housing is provided horizontally; a storage chamber is formed in the storage housing; the discharge cartridge is provided vertically and communicates with the storage chamber; the storage housing is fixed on the support rack; the evaporator and the scraper are located in the storage chamber. The present disclosure can prevent leakage of the smoothie, thereby improving the use experience.

Abstract: The present disclosure provides an evaporation device for a slush machine and a refrigeration system. The evaporation device for a slush machine includes an evaporation mechanism, an outer housing sleeved on the evaporation mechanism, and a rotary stirring mechanism provided at one end of the evaporation mechanism, where the evaporation mechanism includes a cooling cartridge and an evaporator provided in the cooling cartridge; the rotary stirring mechanism includes a protective housing; the evaporation device for a slush machine further includes a sealing ring; one end of the cooling cartridge is provided with a fixed ring; the fixed ring is connected to the protective housing; the sealing ring is provided between the fixed ring and the protective housing. With desirable airtightness and waterproofness, the present disclosure can be connected stably, and can prevent the displacement that affects the waterproof effect.

Abstract: A method for determining a recovery factor of a deep coal bed methane (CBM) well includes steps of: (1) collecting an original formation pressure and pressure-volume-temperature (PVT) experimental data of the CBM well, and establishing a relationship table between pressure and deviation factor; (2) obtaining isothermal adsorption experimental data, an original adsorbed gas content and an original free gas content for the deep coal rock; (3) according to the isothermal adsorption experimental data, determining Langmuir's pressure and Langmuir's volume; (4) determining an abandoned formation pressure in CBM well exploitation; (5) obtaining a deviation factor at the original formation pressure and a deviation factor at the abandoned formation pressure; and (6) according to the original formation pressure, the original adsorbed gas content, the original free gas content, the Langmuir's pressure, the abandoned formation pressure, the above deviation factors, the recovery factor of the CBM well is calculated.

Abstract: A method for determining productivity of deep coalbed methane well considering impacts of fracturing fluids and produced water includes steps of: based on coalbed methane PVT experimental data, determining a relationship table between pressure and deviation factor, and determining process parameter; recording daily gas production rates, bottomhole flow pressures, cumulative gas productions, and cumulative water production; determining formation pressures based on a coalbed methane material balance equation considering the impacts of the fracturing fluids and the produced water; according to the formation pressures, the bottomhole flow pressures and the production rates, determining coefficients in a deliverability equation for the coalbed methane well, thereby determining the deliverability equation; putting the formation pressure and the bottomhole flow pressures into the deliverability equation and solving for the productivity of the coalbed methane well.

Abstract: A method for determining production shares of free gas and adsorbed gas in deep coalbed methane well mining includes steps of: collecting an original formation pressure and PVT sampling experimental analysis data of a coalbed methane well to obtain deviation factors; collecting isothermal adsorption experimental data as well as adsorbed gas content and free gas content under the original formation pressure and the temperature conditions; determining a Langmuir pressure and a Langmuir volume based on the isothermal adsorption experimental data; determining daily production of the free gas and the adsorbed gas, determining a coalbed methane recovery percent, and determining production shares of the free gas and the adsorbed gas under any formation pressure; and obtaining the production shares of the free gas and the adsorbed gas under different recovery percent. The method is simple, easy to understand and implement.

Abstract: The present invention relates to development research of oil and gas fields, and more particularly to a method for determining transmissibilty in numerical simulation of oil and gas reservoirs on unstructured grids. Based on the core seepage experimental data and well logging data of the drilled wells, the method takes into account the centroid distance of two adjacent grids as well as seepage direction vectors in the oil and gas reservoir simulation, and then adopts effective seepage area and directional permeability of the interface between the adjacent grids in seepage direction to calculate the transmissibilty. The present invention further verifies the reliability of the method by a rectangular grid example (rectangular grid is a special case of unstructured grids) whose accurate transmissibilty values can be obtained. The method of the present invention is simple, easy to understand and realize, operable, effective and practical.

Abstract: A method for determining adsorbed gas content during a production process of a deep coalbed methane well, includes steps of: collecting an original formation pressure, PVT experimental analysis data, a Langmuir pressure, an adsorbed gas content in the reserves under the original formation pressure conditions, a free gas content in the reserves under the original formation pressure conditions, and a coalbed methane well productivity equation obtained based on historical production test data; establishing a functional relationship expression between the deviation factor and the formation pressure; obtaining a coalbed methane well production and a bottom hole flow pressure at a preset production time; determining a formation pressure at the preset production time; and determining a deviation factor under an original formation pressure condition; utilizing a model to determine the adsorbed gas content pera in the coal bed methane production at the corresponding production time.

Abstract: A method for determining a productivity of a coalbed methane well without shutting down the well includes steps of: obtaining coalbed methane basic data; based on PVT experimental data, determining a relationship table between a pressure and a coalbed methane deviation factor, and a relationship table between the pressure and a pseudo-pressure; recording daily gas production rates, bottomhole flow pressures, and cumulative gas productions at each stabilized flow pressure test moment in at least three different production stages; determining formation pressures corresponding to each stabilized flow pressure test moment based on a material balance equation; according to the formation pressures, the bottomhole flow pressures and the production rates, determining coefficients in a deliverability equation of the coalbed methane well for determining the deliverability equation; substituting the formation pressures and the bottomhole flow pressures into the deliverability equation for obtaining corresponding product

Abstract: The present disclosure discloses an antenna apparatus and an electronic device, relating to the technical field of antennas. The antenna apparatus includes a circuit board, a first coil, and a light module. The first coil is provided on the circuit board. The light module is annularly provided on the circuit board along a circumferential direction of the first coil. For the antennal apparatus provided in the present disclosure, by providing the first coil on the circuit board, and meanwhile arranging the light module in a ring shape on the circuit board along the circumferential direction of the first coil, the light module and the first coil are respectively electrically connected to a motherboard of the electronic device, so that an operating state of the first coil is displayed by brightness or color of the light module.

Abstract: A star rating management method for deployment and implementation of gas field development wells first establishes the expression for estimating the gas well initial production rate and the dimensionless production curve; then determines the annual production of the new well for every year during the evaluation period and determines the internal rate of return of the new gas well. If the internal rate of return fails to meet the requirement, the deployment location and construction technology of the new well are re-optimized. Corresponding stars rating are determined according to the internal rate of return of the gas wells. The new well is drilled according to the deployment location that can meet the economic benefit requirements. After the gas well is drilled, a more detailed fracturing design is carried out, and the internal rate of return of the gas well and the star rating of development benefit are redetermined.

Abstract: A method for evaluating a gas well productivity with eliminating an influence of liquid loading includes steps of: collecting basic data of a liquid loading gas well; according to a relative density of natural gas, a formation depth, and a casing pressure during a productivity test, determining a pressure generated by a static gas column in an annular space between a casing and a tubing from a well head to a bottomhole of the gas well, and obtaining a bottomhole pressure without liquid loading; according to a pseudo-pressure of a formation pore pressure, pseudo-pressures of the bottomhole pressure respectively under the conditions of liquid loading and no liquid loading, and a production rate under the condition of liquid loading, determining a production rate without liquid loading, and determining an absolute open flow rate with eliminating the influence of liquid loading.

Abstract: A micro/nanoparticle-reinforced composite solder for low-temperature soldering and a preparation method thereof belong to the manufacturing field of lead-free low-temperature soldering solders. Micro/nanoparticle-reinforced tin-based alloy solder powder is formed by diffusely mixing micro/nano-sized Cu, Ag and Sb particles with a molten metal tin and atomizing the mixture, and then blended with low-melting-point SnBi-based alloy solder powder and a conventional flux to prepare a micro/nanoparticle-reinforced composite solder. In soldering at a temperature below 200° C.

Abstract: A composite image generation system comprises: a position information detection device that detects position information about a predetermined spot in a real space; and a processing device that generates a composite image in which a separately acquired superimposed image is overlaid onto a desired region in a camera image of the real space captured by a movably placed video camera, based on the detected position information. In the processing device, after performing an initial setting that sets a global coordinate system that serves as a reference when generating the composite image, the initial setting being performed while each optical marker is in a stationary state, position information about a peripheral marker used during the initial setting is reset according to a recognition state of the peripheral marker provided at a predetermined spot presumed to be disposed in the stationary state and a detection state from an acceleration sensor.

Abstract: A composite image generation system comprises: a position information detection device 14 that detects position information about a predetermined spot in a real space; and a processing device 16 that generates a composite image in which a separately acquired superimposed image is overlaid onto a desired region in a camera image of the real space captured by a movably placed video camera 18, based on the position information from the position information detection device 14. The processing device 16 includes a position information specifying means 35 that adjusts a detection result from the position information detection device 14 to specify position information about a probe 19 used when superimposing the superimposed image onto the desired region.

Abstract: A composite image generation system comprises: a position information detection device 14 that detects position information about a predetermined spot in a real space; and a processing device 16 that generates a composite image in which a separately acquired superimposed image is overlaid onto a desired region in a camera image of the real space captured by a movably placed video camera 18, based on the position information from the position information detection device 14. The processing device 16 includes a position information specifying means 35 that adjusts a detection result from the position information detection device 14 to specify position information about a probe 19 used when superimposing the superimposed image onto the desired region.

Abstract: A method for evaluating a gas well productivity with eliminating an influence of liquid loading includes steps of: collecting basic data of a liquid loading gas well; according to a relative density of natural gas, a formation depth, and a casing pressure during a productivity test, determining a pressure generated by a static gas column in an annular space between a casing and a tubing from a well head to a bottomhole of the gas well, and obtaining a bottomhole pressure under a condition of no liquid loading; according to a pseudo-pressure of a formation pore pressure, pseudo-pressures of the bottomhole pressure respectively under the conditions of liquid loading and no liquid loading, and a production rate under the condition of liquid loading, determining a production rate under the condition of no liquid loading, and determining an absolute open flow rate with eliminating the influence of liquid loading.

Abstract: The present disclosure discloses a manufacturing device of mask assembly including at least one mask, comprising a first stretching mechanism configured to clamp the edges of the mask in a first direction and stretch the mask in a second direction and a second stretching mechanism configured to clamp the edges of the mask in the second direction and stretch the mask in the first direction, wherein the first direction being perpendicular to the second direction. The disclosure also relates to a method of manufacturing a mask assembly and a mask assembly.

Abstract: A composite image generation system comprises: a position information detection device that detects position information about a predetermined spot in a real space; and a processing device that generates a composite image in which a separately acquired superimposed image is overlaid onto a desired region in a camera image of the real space captured by a movably placed video camera, based on the detected position information. In the processing device, after performing an initial setting that sets a global coordinate system that serves as a reference when generating the composite image, the initial setting being performed while each optical marker is in a stationary state, position information about a peripheral marker used during the initial setting is reset according to a recognition state of the peripheral marker provided at a predetermined spot presumed to be disposed in the stationary state and a detection state from an acceleration sensor.