Abstract: The present disclosure belongs to the field of offshore oil, and in particular relates to a method for assessing the safety integrity level of offshore oil well control equipment. The method for assessing the safety integrity level of the offshore oil well control equipment comprises three major steps: creating a safety instrumented function evaluation module and dividing the related devices for performing the safety instrumented functions into a sensor subsystem; a controller subsystem and an actuator subsystem, establishing a dynamic Bayesian network model for respective subsystems for calculation; and integrating, analyzing and optimizing the safety integrity data of the subsystems.

Abstract: The present disclosure belongs to the field of marine engineering, and in particular relates to a method and system for guaranteeing the safety of offshore oil well control equipment. The method comprises: identifying the state of a main structure of the offshore oil well control equipment, identifying the state of a hydraulic control unit of offshore oil well control equipment, identifying the state of an electronic control unit of offshore oil well control equipment, predicting the state of the offshore oil well control equipment and making a real-time decision based on existing information; and the system for guaranteeing the safety of the offshore oil well control equipment comprises a state identification subsystem of a main structure, a state identification subsystem of the hydraulic control unit, a state identification subsystem of the electronic control unit and a state prediction and real-time decision subsystem.

Abstract: The present disclosure belongs to the field of petroleum engineering, in particular to a fully-electrically driven downhole safety valve. The fully-electrically driven downhole safety valve comprises a downhole safety valve mechanism and a downhole safety valve control system; wherein the downhole safety valve mechanism includes an electronic cabin module, a transmission control module, a motion conversion module, a magnetic coupling and spring module. and a valve module; the downhole safety valve control system includes a downhole comprehensive unit and an uphole comprehensive unit.

Abstract: The present disclosure relates to a method and system for evaluating the macro resilience of offshore oil well control equipment. The method for evaluating the macro resilience of offshore oil well control equipment comprises six steps: determining the type and strength of external disaster; calculating the failure rate of components; calculating the recovery rate of the components; modeling the BN for a degradation process; modeling the BN for a maintenance process; and calculating the resilience of the offshore oil well control equipment. A system for evaluating the macro resilience of offshore oil well control equipment comprises an external disaster evaluation module, a component failure rate calculation subsystem, a reliability degradation process simulation module, a fault identification module, a component recovery rate calculation module, a reliability recovery process simulation module, a reliability change curve derivation unit and an resilience calculation unit.

Abstract: The present disclosure relates to a method for oil displacement using a dispersed particle gel-strengthened polymer ternary composite displacement system.

Abstract: A natural gas power generation process with zero carbon emission is described. The process includes pressurizing air and introducing the pressurized air into an air separation facility to obtain liquid oxygen and liquid nitrogen. The liquid oxygen is used for gasification and power generation The liquid nitrogen is applied as a coolant of flue gas, and then for gasification and power generation.

Abstract: A modified nano graphite, a polymer composite material of the modified nano graphite, and use of the polymer composite material in a high temperature and high salinity oil reservoir.

Abstract: A method for improving the gas recovery of a natural gas hydrate reservoir by using artificial impermeable layers is described. Artificial impermeable layers are formed by injecting cement slurry into the permeable overburden and underburden layers. When depressurization exploitation is performed, a large amount of seawater can be effectively blocked from entering a hydrate layer, and a production pressure difference between the hydrate layer and the production well is effectively increased, so that a hydrate decomposition rate and the gas recovery are improved.

Abstract: The present disclosure discloses an integrated device for millisecond-level gas phase catalytic cracking reaction and separation, comprising: a horizontal inertial cyclone separator, a horizontal inertial cyclone separator feed tube, a pyrolysis vapour inlet, a regenerated catalyst inlet, a horizontal inertial cyclone separator central tube, a cracked vapour outlet, a catalyst outlet tube, a spent catalyst silo, a first loop-seal, a riser regenerator, a settling tank, a gas-solid separator, and a second loop-seal.

Abstract: A method for preparing titanium-containing molecular sieves include the following steps: irradiating a mixed solution containing a silicon source, a template and a titanium source by a light source containing ultraviolet light before crystallization, and then subjecting the mixed solution to crystallization and post-treatment to obtain the titanium-containing molecular sieve. In the method for preparing titanium-containing molecular sieve of the present invention, the mixed solution containing the silicon source, the template and the titanium source is treated with the ultraviolet light, and free radicals generated by the ultraviolet light can effectively dissociate titanium oligomers and accelerate the hydrolysis of the silicon source, and thus match the hydrolysis rate of a silicon-titanium precursor, thereby preventing a titanium monomer from self-polymerization to form non-framework titanium.

Abstract: A foam solution for profile control and plugging in heavy oil thermal recovery process, a preparation method thereof, and a method for profile control and plugging.

Abstract: A daily gas production rate of a methane hydrate deposit is calculated based on inflow performance relationship formulas. Step 1 determines the production stage, including the gas production rate trend of a production test and selecting an inflow performance relationship formula corresponding to the stage. Step 2 calculates basic coefficient terms related to energy conversion in the inflow performance relationship formula. Step 3 obtains other coefficient terms related to production in the inflow performance relationship formula. Step 4 predicts the gas production rate under other production pressure differences. Staged inflow performance relationship formulas characterize the complex methane hydrate deposit production performance.

Abstract: The disclosure discloses a method for obtaining formation parameters of a gas hydrate reservoir through well testing interpretation, which comprises: (1) establishing a physical model for well testing interpretation of the gas hydrate reservoir according to multiphase flow, hydrate dissociation, secondary hydrate formation and heat transfer exhibited in the well testing process of the gas hydrate reservoir; (2) establishing a mathematical model for well testing interpretation of the gas hydrate reservoir; (3) conducting spatial discretization and temporal discretization on the mathematical model, and adopting a finite volume method to obtain a numerical solution of bottom-hole pressure; (4) calculating a bottom-hole pressure variation curve and a production rate variation curve in the well testing process of the hydrate reservoir, and drawing theoretical curves of bottom-hole pressure difference and pressure difference derivative; and (5) matching a measured pressure curve with the theoretical curve to obtain

Abstract: An evaluation method for different types of pore evolution in shale is related, which is applied to the field of unconventional oil and gas research. As the shale depth or maturity increases, different types of pores (including intergranular pores, intragranular pores, organic pores and fractures) developed in shale are constantly changing, which is important for shale oil and gas accumulation. The present invention starts from the high-resolution scanning electron micrography of shale, and respectively extracts the areal porosity of different types of pores based on the division criteria of different types of pores and pore identification in the established shale, and combines the low-temperature N2, CO2 adsorption experiments and the high-pressure mercury intrusion experiments to obtain the total pore volume and establish the evolution chart of different types of pores. The proposed method has an important application value for the exploration of unconventional shale oil and gas resources.

Abstract: A depressurization device for downhole annulus drilling fluid includes a central shaft and a barrel body sheathed outside the central shaft, the central shaft includes a force transmission shaft and a liquid separation piston; the barrel body includes a spline barrel, an elastic element protection barrel, a connector and a depressurization barrel; the elastic element protection barrel and the connector are sheathed outside the force transmission shaft; an elastic element is arranged between the elastic element protection barrel and the force transmission shaft; the depressurization barrel is sheathed outside the liquid separation piston; a first liquid storage chamber and a second liquid storage chamber are formed; a first inlet passage and a first drain passage are formed on the connector; a second inlet passage and a second drain passage are formed on the depressurization barrel; suction valves are arranged on the first inlet passage and the second inlet passage; and, second drain valves are arranged on the

Abstract: A method for homogenizing the compositions and mechanical performances of nickel-based material brazed joints, includes three homogenized manufacturing steps: Step I, assembling the welding sample, placing it into the vacuum furnace, and then heating up to 830˜860° C. and holding the temperature; then heating up again to 1050˜1100° C. and holding the temperature; allowing for slow self-cooling in vacuum till it reaches 620˜640° C.; then filling the furnace with nitrogen and starting the vacuum furnace fan at the same time, so that the sample is cooled down to 40˜60° C.; Step II, raising the temperature up to 1140˜1160° C. and holding, then cooling it down to the room temperature through water-quenching; Step III, raising the temperature of the welding sample up to 680˜750° C. again, and cooling it down to the room temperature through air cooling.

Abstract: An isotope nuclear magnetic method for analyzing ineffective water absorption of rock pores includes steps of: saturating core pores of a core sample with a wetting phase fluid of water H2O, and obtaining a core T2 spectrum after being saturated with the water; re-saturating the core pores with a wetting phase fluid of heavy water D2O, and obtaining a rock baseline T2 spectrum; injecting fluorinated oil into the core sample saturated with the heavy water; injecting the water H2O, simulating a water injection process, and injecting the fluorinated oil, so as to analyze a content of immobile water and obtain a residual T2 spectrum, wherein a range formed by a difference between the residual T2 spectrum and the rock baseline T2 spectrum is an ineffective water absorption portion of the rock pores, and an ineffective water absorption amount is obtained.

Abstract: A screw drill bypass valve comprising a valve body, the valve body is internally provided with a first-level valve core and a second-level valve core, a first-level spring is arranged between the first-level valve core and the second-level valve core, a second-level spring is arranged between the second-level valve core and a valve seat, and a rigidity of the second-level spring is greater than that of the first-level spring; the first-level valve core is provided with an inner bypass hole, the valve body is provided with an outer bypass hole, and the inner bypass hole is conducted with the outer bypass hole when a flowing pressure within a fluid channel of drilling fluid disappears; the second-level valve core is provided with an inner diversion hole, the valve body is provided with an outer diversion hole.

Abstract: A classified reduction gasification iron smelting process of iron ore powder and coal powder in a Y-type entrained flow bed. The process comprises the following steps: uniformly mixing the pre-reduced hot iron ore powder with the coal powder, and introducing the mixture, a gasification agent and water vapor into a Y-type entrained flow bed for performing combustion, gasification and reduction reaction to obtain crude syngas and molten iron; the crude syngas is used for sucking iron ore powder to enter a riser to perform preheating and partial reduction.

Abstract: A simulation test system for gas extraction from a tectonically-deformed coal seam in-situ by depressurizing a horizontal well cavity. A coal series stratum structure reconstruction and similar material simulation subsystem simulates a tectonically-deformed coal reservoir. A horizontal well drilling and reaming simulation subsystem constructs a U-shaped well in which a horizontal well adjoins a vertical well, and performs a reaming process on a horizontal section thereof. A horizontal well hole-collapse cavity-construction depressurization excitation simulation subsystem performs pressure-pulse excitation and stress release on the horizontal well, and hydraulically displaces a coal-liquid-gas mixture such that the mixture is conveyed towards a vertical well section. A product lifting simulation subsystem further pulverizes the coal and lifts the mixture. A gas-liquid-solid separation simulation subsystem separates the coal, liquid and gas.