Abstract: The invention relates to petroleum seismic exploration, and more specifically to a method for gas-bearing reservoir characterization using logging information. In the method, logging information is used as a constraint to indirectly characterize the distribution range of the gas-bearing reservoir by determining the upper and lower boundaries. In addition, this method enables the automatic determination of the optimal calculation parameters according to the characteristics of input data, allowing for more accurate results.

Abstract: A numerical simulation and parameter optimization method for volumetric fracturing of an unconventional dual medium reservoir includes the following steps: based on the theory of dual-medium pore elasticity, in consideration of the friction effect between fractures, developing a viscoelastic-plastic damage model of hydraulic fractures based on explicit time integral; simulating random intersection and bifurcation of hydraulic fractures encountering with natural fractures by adopting a method of embedding zero-thickness fracture units in the inner boundaries of computational model grids, and establishing a mathematical model of hydraulic fracture expansion of volumetric fracturing in the unconventional dual-medium reservoir; compiling a finite element program for complex multi-fracture fracturing and competitive expansion during volumetric fracturing of the unconventional reservoir, and establishing a hydraulic fracturing finite element model of a casing-cement ring-perforation hole in cluster-reservoir matrix

Abstract: A design method for a personalized drill bit for a complex difficult-to-drill formation includes: S1, acquiring rock drillability indexes of a drilled formation; S2, performing digital simulation analysis of rock breaking of bit teeth and a composite rock breaking experiment of a ring gear and a drill bit, and establishing a mechanical model of the rock interaction at the bottom of a well; S3, establishing an integrated dynamics model of drill string-drill bit-rock system coupling; S4, designing a tooth shape, a tooth distribution density, a crown shape and a gauge protection structure for rock mechanics properties of a complex difficult-to-drill formation; S5, optimizing bit nozzle and hydraulic structure parameters by using the computational fluid dynamics theory and the numerical simulation method; S6.

Abstract: The present disclosure relates to a high-temperature retarder suitable for oil and gas well cementation, a preparation method thereof and a cementing slurry.

Abstract: A system for monitoring rock damage in deep engineering environment includes an acoustic emission sensor assembly and an acoustic emission amplifier assembly. The assemblies are mounted on a rock mechanics test system. The acoustic emission sensor clamp includes a coupling screw, as well as a clamp cover, a clamp cylinder, and a coupling panel threadedly connected in sequence. The acoustic emission amplifier assembly includes an acoustic emission amplifier, an upright column having a guide rail, a lifting support plate, and a support plate lifting oil cylinder. Additionally, an evaluation method based on acoustic emission tempo-spatial evolution laws is presented. According to the properties of acoustic emission, fractal characteristics of damage evolution processes of rock test pieces are analyzed and the relationship between stress, energy and fractal dimension in the whole process of tensile deformation damage of the rock test pieces is obtained.

Abstract: A tempo-spatial evolution test system for rock breaking in deep and complex environment includes an acoustic emission sensor assembly and an acoustic emission amplifier assembly that are arranged on a rock mechanics test system. A triaxial cavity coupling bracket is arranged on an outer wall of the triaxial cavity and between two sets of acoustic emission sensor assemblies. The triaxial cavity coupling bracket includes a plate-shaped bracket, two sickle-shaped brackets, and at least three bracket bolts, which can be tightly wrapped on the outer wall of the triaxial cavity. A lateral side of the plate-shaped bracket vertically fixes two guide columns. The acoustic emission amplifier assembly is arranged between the two guide columns and is located above the plate-shaped bracket, and the acoustic emission amplifier assembly is connected to the acoustic emission sensor assembly through a signal line.

Abstract: A coiled tubing drilling robot, a robot system and a process parameter control method thereof. The coiled tubing drilling robot is mainly characterized in that a drilling pressure and a drilling speed of a drill string are adjusted by an electric proportional relief valve and an electric proportional flow valve disposed inside the drilling robot; a support mechanism of the drilling robot adopts a single oblique block to prop against a spring piece to clamp a well wall; the coiled tubing drilling robot system consists of a coiled tubing intelligent drilling rig, a wellhead device, a coiled tubing, a drilling robot, a drill string vibration measurement device, a MWD, a power drill and a drill bit.

Abstract: A water pumping and injecting multi-layered concentric sphere neutron spectrometer includes a neutron detector, a plurality of shells concentrically provided, and a water pumping and injecting device; wherein an innermost shell surrounds a surface of the neutron detector; gaps are formed between adjacent shells for containing liquid; the shells are made of an aluminum material; a valve is arranged on each of the shells except the innermost shell; the water pumping and injecting device is connected to the valve of each of the shells except the innermost shell, so as to input water into the gaps or output the water from the gaps. Compared with conventional neutron spectrometer, weight of the water pumping and injecting multi-layered concentric sphere device and the neutron spectrum detection system of the present invention is greatly reduced, which is conducive to transportation and utilization. Meanwhile, combination of neutron spectrum data measurement and measurement data are increased.

Abstract: The present invention relates to an intelligent switching valve for reservoir reformation and production monitoring and control. The intelligent switching valve comprises a connection short section, an electric short section, a fluid storage short section, a hydraulic control short section and a slide sleeve short section. The middle part of the intelligent switching valve is a full bore. In a working process, a casing coupling and a casing are connected and are mounted under the shaft as components of a well cementation casing. Wireless communication with ground equipment is realized through low-frequency electromagnetic waves to finish receiving/transmitting of working instructions and data. The switching valve is opened and closed under electric and hydraulic control and external assisting is not needed in an opening or closing process. The number of times of opening and closing is not limited and the number of stages is not limited.

Abstract: A loading platform for a rock mechanics test system (MTS) to realize simple and reliable connection between a high temperature and high pressure force sensor in a triaxial chamber cavity and an upper solid rigid column. The loading platform for rock mechanics test includes a master rod, a secondary rod and a stop sleeve sleeved on the master rod; the stop sleeve is provided with two corbel structures; the secondary rod is composed of a secondary rod head body and a secondary rod body; a circular magnetic block is fixed on the secondary rod to adsorb a hole alignment sleeve sleeved on the secondary rod; and the hole alignment sleeve marked with a first scale line and a second scale line.

Abstract: An amplifying device includes a power amplifying unit, a power supply unit for providing the power amplifying unit with a positive power supply and a negative power supply, and a mode control unit for controlling a working mode of the power supply unit. The positive power supply and the negative power supply of the amplifying device are able to vary with an output signal thereof, which reduces the power consumption of the outputted transistors of the amplifying device, thereby improving the efficiency of the amplifying device.

Abstract: A multipath-output-supporting evidence-based acupuncture and moxibustion acupoint therapeutic and detecting instrument and a using method thereof. The therapeutic and detecting instrument comprises a CPU core unit, a communication module, an audio module and a plurality of detecting, diagnosis and treatment circuits. The detecting, diagnosis and treatment circuit comprises an acupoint detecting unit and an acupoint acupuncture and moxibustion unit. The acupoint detecting unit comprises a resistance detecting circuit and an A/D digital converting circuit. The acupoint acupuncture and moxibustion unit comprises a D/A pulse current generating circuit and an amplifying circuit. The CPU core unit comprises an ARM processor, a memory, an auxiliary circuit and an evidence-based acupuncture and moxibustion therapeutic system, and the ARM processor is connected with the evidence-based acupuncture and moxibustion therapeutic system.

Abstract: A data-oriented information technology system has a data registration center, a data resource pool and a data service unit layer. The data resource pool is a space for storing data; the data registration center is used for constructing uniform data definition, naming and registration functions to realize data management; the data service unit layer includes a plurality of data-oriented, relevant function-encapsulated data function units, and data function units are used for accessing data in the data resource pool; when they first accesses the data resource pool, when the data registration center takes the initiative to refresh the information and informs the data function units, and when abnormalities occur during accessing, it is necessary to obtain information required for access from the data registration center, so that they can access data in the data resource pool.

Abstract: The present invention relates to herbal compositions and herbal extracts useful for treating cerebral vascular disease, including stroke, intracranial hemorrhage, intracranial infarction, and vascular dementia. The present invention can be used to reduce mortality rate and improve the quality of life of an individual after pathological injury that results in cerebrovascular and/or neuronal disorders. Further, the invention relates to the treatment of acute intracerebral hemorrhage by the novel herbal formulation PHY828 and provides methods of making PHY828 compositions.

Abstract: A low pressure ion-chromatograph for the analysis of cations comprises eluent reservoirs, pump, sample injection valve, sampler, column, flow conductivity cell, electrical conductivity detector and recorder, wherein the pump is a low pressure electronic micropump, the angle included between the inlet and outlet of eluent in the cell is 45.degree.-135.degree., and the flow conductivity cell is oriented in such a position that the eluent inlet is either horizontal or sloping upwardly. There is no leakage in this instrument. No special demands are needed for seal and material. Very good precision and high sensitivity up to ppb level can be obtained, and with low cost.