3 results about "Pressure equilibrium" patented technology

Process for energy storage and release, comprising: implementing a closed cyclic thermodynamic transformation (TTC), first in a forward path in a storage phase and then in a return path in a release phase, between an enclosure (2) for storing a working fluid other than atmospheric air in the gaseous phase and in pressure equilibrium with the atmosphere and a reservoir (6) for storing the working fluid in liquid or super-critical phase; wherein in the storage phase the process accumulates heat and potential energy in the form of pressure and in the release phase the process generates energy. During the storage phase and / or the release phase, internal heat is also intended to be moved among different portions of the working fluid flowing in a first part of a forward path and in a second part of the forward path, respectively, and / or among different portions of the working fluid flowing respectively in a first part of a return path and in a second part of a return path.

A process comprises: implementing a closed thermodynamic cyclic transformation (TTC), first in one direction in a storage phase and then in an opposite direction in a release phase, between an enclosure (2) for storing a working fluid other than atmospheric air in the gaseous phase and in pressure equilibrium with the atmosphere, and a reservoir (6) for storing said working fluid in liquid or super-critical phase. The storage phase comprises: A-B preheating the working fluid coming from the enclosure (2); B-C compressing the working fluid a first time using external energy to be stored; C-D removing a first amount of heat (Q1) from the working fluid to cool it a first time and storing the first amount of heat (Q1); D-E further cooling the working fluid by removing excess heat (QE) from the working fluid; E-F compressing the working fluid a second time using additional external energy to be stored; F-G removing a second amount of heat (Q2) from the working fluid to cool it a second time and storing the second amount of heat (Q2); G-H removing a third amount of heat Q3 from the working fluid to increase a density of the working fluid, storing the third amount of heat Q3, and storing the working fluid in the reservoir (6) in liquid or super-critical phase. At least part of the excess heat QE removed in the sub-phase D-E is recovered and used in the sub-phase A-B to preheat the working fluid from the enclosure (2).

This invention discloses a method for calculating the three-phase phase equilibrium of oil, gas, and water at the nanoscale, relating to the field of shale oil reservoir development technology. The method includes the following steps: receiving input parameters; constructing a total pressure model of the confined fluid at the nanoscale based on the input parameters; constructing a three-phase pressure equilibrium model among the oil, gas, and water phases at the nanoscale based on the total pressure model; constructing a phase stability test model, and determining whether phase separation occurs in the system under given temperature and pressure conditions based on the tangent plane distance function; when the phase stability test model determines that phase separation has occurred, calculating the phase fraction and composition of the oil-gas-water three phases by iteratively solving for the conditions satisfying the three-phase pressure equilibrium model and the equality of the fugacity of each phase component, and outputting the results. This invention can accurately and stably predict the fluid phase state in the nanopores of shale oil reservoirs, providing key technical support for its component simulation and efficient development.