7 results about "Apparent permeability" patented technology

The invention belongs to the technical field of petroleum and natural gas engineering, and particularly relates to a shale gas reservoir multi-component seepage apparent permeability calculation method which comprises the steps that S1, shale gas reservoir micro-nano pores are equivalent to a channel formed by connecting a plurality of organic pore sections and inorganic pore sections in series, and a seepage physical model is constructed; s2, considering shale gas multi-component composition, and constructing a multi-component gas average molecular free path calculation model; s3, establishing a first apparent permeability calculation equation for inorganic pores; s4, for the organic pores, establishing a second apparent permeability calculation equation; and S5, respectively carrying out scale upgrading on the first apparent permeability and the second apparent permeability, and obtaining the shale multi-component seepage apparent permeability according to the proportion of the organic pores. According to the method, factors such as multi-component gas migration, pore size dynamic change, organic matter multi-component gas competitive adsorption and the like are comprehensively considered, and the shale gas reservoir apparent permeability calculation method integrating the factors is established.

The application discloses a kind of deep unconventional compact reservoir permeability effective stress coefficient precision determination and multi-mechanism decoupling method.The present application relates to the technical field of unconventional compact natural gas development, and the method comprises the following steps: non-adsorptive and adsorptive gas is respectively introduced into rock sample, and the first and second apparent permeability is obtained under different confining pressure and pore pressure;By permeability continuous evolution surface modeling, the permeability rebound boundary is identified, and the pressure space is divided into the main control area of slippage effect and the main control area of effective stress;The effective stress coefficient and the first slippage factor are inverted in the main control area of slippage, and the stress sensitivity coefficient of adsorptive gas is inverted in the main control area of effective stress, and the inherent permeability of adsorptive gas is calculated according to the first slippage factor and the second apparent permeability;Based on the inherent permeability model, the internal expansion coefficient is inverted;Finally, the contribution proportion of slippage effect, stress effect and adsorption deformation effect is calculated, so as to divide the main control stage of reservoir extraction period.

The invention discloses a shale gas reservoir apparent permeability calculation method based on a fuzzy theory, and belongs to the field of petroleum and natural gas engineering, and the shale gas reservoir apparent permeability calculation method comprises the following steps: S1, establishing a concentration cloud model of free gas and adsorbed gas, S2, establishing a flux model of a shale gas reservoir, S3, calculating the membership degree of each flow mechanism, and S4, deducing the apparent permeability. The fuzzy theory and the multi-mechanism flow model are creatively fused, the limitation of a traditional calculation method under the complex reservoir condition is effectively broken through, the accuracy and reliability of apparent permeability calculation are improved, the adaptability of the method to different geological conditions is enhanced, and the method has good application prospects. According to the method, more scientific theoretical support and technical guarantee are provided for efficient exploration and development of shale gas reservoirs, meanwhile, fuzzy features of multi-mechanism flow are accurately described, the calculation precision is improved, different geological conditions are dynamically adapted, the applicability of the method is enhanced, the multi-mechanism contribution proportion is quantified, and a basis is provided for optimization of a development scheme.

The invention discloses an in-vitro permeability evaluation method of an insoluble compound and application of poloxamer 407 in in-vitro permeability evaluation of the insoluble compound. The evaluation method comprises the following steps: S1, carrying out correlation analysis on the oral absorption percentage of a known medicine in a human body and the apparent permeability coefficient of the known medicine in an in-vitro permeability evaluation system containing poloxamer 407, and establishing an in-vitro permeability evaluation standard; s2, adding poloxamer 407 into the in-vitro permeability evaluation system containing the indissolvable compound, and determining the apparent permeability coefficient of the indissolvable compound; s3, comparing the apparent permeability coefficient measured in the step S2 with the in-vitro permeability evaluation standard established in the step S1, and evaluating the permeability of the indissolvable compound. According to the in-vitro permeability evaluation method for the indissolvable compound, the absorption and pharmacokinetic characteristics of the indissolvable compound in a human body can be more accurately predicted, important support is provided for drug screening and development, and the efficiency and success rate of new drug research and development are improved.

This invention relates to the field of oilfield development technology, specifically to a method, apparatus, and electronic equipment for inverting the apparent permeability of shale reservoirs based on gradient-enhanced PINN. The method includes the following steps: S1, establishing the basic differential equation of the target shale reservoir, and constructing various heterogeneous models of shale reservoir permeability based on the basic differential equation; S2, obtaining the basic parameters required for the basic differential equation and generating datasets for each of the various heterogeneous models through numerical simulation; S3, constructing an inversion model based on a neural network, inputting the datasets into the inversion model, and comparing the parameters inverted from each of the various heterogeneous models with the actual parameter values. If the relative error between the two does not exceed a set threshold, the inversion model is considered valid; otherwise, it is invalid. The technical solution of this invention can be applied to the prediction of apparent permeability of shale reservoirs, has stronger information integration capabilities, and high prediction accuracy.

The invention belongs to the technical field of geophysical logging and oil-gas field development, and discloses a deep coal reservoir in-situ apparent permeability calculation method applied to nuclear magnetic logging. The method comprises the following steps: acquiring a deep coal reservoir in-situ nuclear magnetic resonance spectrum; calculating the accumulated signal amplitude of the spectrum; fitting the relationship under a double logarithmic coordinate system, and solving fractal dimensions representing the heterogeneity of the pore structure; the fractal absolute permeability is calculated according to the Lisdarcy law; and finally, in combination with a Klinkenberg equation, establishing a complete model for predicting the apparent permeability under any pore pressure. The permeability result calculated through the method is highly consistent with the in-situ real flow capacity, if the relative error in the embodiment is only 1.34%, the technical problem that an existing model loses the actual guiding significance for productivity prediction due to result distortion is solved.

The invention discloses a multi-stage fractured horizontal well three-area coupling productivity calculation method and related equipment, and relates to the technical field of unconventional natural gas exploration and development, and the method comprises the steps: obtaining the apparent permeability of a gas reservoir non-transformation area, the equivalent permeability of a micro-fracture network of a gas reservoir fractured transformation area, and a hydraulic fracture area pressure drop matrix; on the basis of the apparent permeability, the infinite space point sink function and the box type closed space point sink function, a non-transformation area pressure drop matrix is constructed; constructing a transformation area pressure drop matrix based on the equivalent permeability and a box type closed space point convergence function; and a total pressure drop matrix is constructed based on the hydraulic fracture area pressure drop matrix, the non-transformation area pressure drop matrix and the transformation area pressure drop matrix, a yield matrix equation is solved according to the total pressure drop matrix and a matrix iteration method, and the horizontal well yield is obtained.