60 results about "Matrix permeability" patented technology

The invention discloses a fracture-matrix permeability differential judgment method for a carbonate reservoir equivalent model. The fracture-matrix permeability differential judgment method comprises equivalent fracture single medium value simulated fracture-matrix permeability differential judgment, equivalent matrix single medium value simulated fracture-matrix permeability differential judgment, and equivalent double-porosity and single-permeability value simulated fracture-matrix permeability differential judgment. By the method, the historical matching and project forecast of various carbonate reservoirs with diversified reservoir stratums, complicated fracture and matrix matching relationships, large change of permeability differential, complicated oil gas and water relationships, large change of pressure distribution, large simulation blocks, complicated production histories and the like can be quickly realized.

The invention relates to a shale gas permeability tester. The shale gas permeability tester comprises a gas cylinder, a pressure regulating valve, a first pneumatic valve, a first pressure sensor, a second pneumatic valve, a second pressure sensor and an emptying valve which are sequentially connected through sealing pipelines, and the shale gas permeability tester further comprises a hand-operated valve, a model cup, a temperature sensor, a specimen cup and a thermostat. The invention further relates to a method for testing shale gas permeability. A shale core is crashed into particles with a certain shape, then the particles are placed in a thermostatic sealed container, pressure of the particles with change of time is recorded in real time after certain pressure is added in the container, and therefore the permeability of a shale base material is calculated. A test for the shale gas permeability is no longer affected by crack permeability, and the permeability of the shale base material can be accurately tested.

Methods, program code, computer readable medium, and apparatus estimating permeability at unsampled (uncored) but logged interval locations in a reservoir based upon a similarity with log signatures from cored intervals, are provided. An example of a method can include performing a core plug-by-core plug blind test, defining an objective function which qualifies the quality of the permeability prediction to minimize discrepancies between measured and predicted permeability, optimizing calculated parameters, and estimating permeability values of uncored logged intervals. The method can also include applying a debiasing/variance restoration to compensate for inherent averaging artifacts

A method of recovering hydrocarbons from a hydrocarbon-bearing subterranean formation with a matrix permeability of less than 1 mD is disclosed. The method includes injecting a volume of a first fluid having a viscosity lower than the viscosity of water into an injection well present in the formation; separately injecting a volume of a second fluid into the formation before, after, or before and after injecting the first fluid; and producing at least a fraction of the injected volume of the first fluid and hydrocarbons from the formation through a production well present in the formation.

The invention provides a fracture permeability computing method, comprising the steps of obtaining average fracture permeability according to well test permeability, matrix permeability and fracture porosity, wherein the well test permeability is obtained according to open-flow capacity; establishing a first computing model among the average fracture permeability, average fracture porosity and anaverage fluid movement index; calibrating the first computing model according to the well test permeability and establishing a second computing model among the fracture permeability, fracture porosityand the fluid movement index; and obtaining the fracture permeability according to the second computing model. According to the computing method provided by the invention, the fracture permeability and fracture effectiveness can be evaluated relatively accurately, so a fracture permeability computing result achieves well test precision.

The invention discloses a shear seam shale core pulse attenuation permeability testing method. The method comprises the following steps of: S1: establishing a dual-medium physical model of a shear seam shale core based on a multi-scale seepage model of gas in the shear seam shale core; S2: obtaining a finite volume discrete format corresponding to a physical model by using a finite volume method, solving a full-implicit solving format of the physical model by combining the Newton-Raphson iterative algorithm, and programming and solving the model; S3: performing a pulse attenuation experiment on the shear seam shale core by using a pulse attenuation method experiment device, and measuring a pressure and time relation curve of an upstream chamber and a downstream chamber by using the experimental data; and S4: combining the dual-medium physical model of the shear seam shale core, and acquiring the matrix permeability and the fracture permeability of the shear seam shale core by adopting a curve fitting method. The method can be used for testing the permeability of the shale core with the shear seam.

The invention provides a shale gas saturation determination method, device and equipment based on deep learning, and the method comprises the steps of obtaining the fracture permeability and target moment of a target stratum; converting the fracture permeability into equivalent matrix permeability to obtain equivalent permeability data of the target stratum; determining a target equivalent permeability field diagram of the target stratum according to the equivalent permeability data; and according to the target equivalent permeability field diagram and the target moment, determining a saturation field diagram of the target stratum at the target moment by utilizing a target deep convolution decoding network. In the embodiment of the invention, a solving problem of an uncertainty equation can be converted into a graph-graph regression problem by utilizing a target deep convolution solution coding network, and a relationship among a permeability field graph, a target moment and a saturation field graph is established. And the resolution of the image can be reduced through the target deep convolution decoding network, so that the calculation efficiency can be effectively improved, andthe technical effect of efficiently and accurately predicting saturation distribution is achieved.

The invention discloses a fracture simulation method for a fractured tight sandstone oil-gas reservoir. The method is characterized by comprising the following steps: step one: pressing a core model and laying gauze elements with different layer numbers at the middle part of the core model to simulate different fracture apertures; step two: determining the relationship between the gauze elements with different layer numbers and the fracture apertures; step three: determining the relationship between different placement directions of the gauze elements in the core model and the fracture strike;step four: determining the relationship between different layer numbers of the gauze elements and the fracture permeability. The method disclosed by the invention can simulate fractures with different fracture apertures, different branch numbers and different strikes in fractured oil and gas reservoirs; the simulated minimum fracture aperture can reach 0.08mm which fully reaches the micro-fracture level, while the maximum fracture aperture can be set according to needs; meanwhile, the matrix permeability can be as low as 0.1*10<-3>mu m<2> which reaches the ultra-low permeability level of a tight oil reservoir matrix, so that indoor simulation requirements of actual production conditions in the oil reservoir are met.

He invention discloses a method for calculating the permeability of a matrix after acid fracturing of carbonatite. The method comprises the steps that 1) basic parameters are collected; 2) a viscositydynamic change equation of natural gas in the matrix flowing process is set up; 3) a dynamic change calculation model of the tubular billet aperture and the secondary microfissure width considering stress sensitivity is set up; 4) the starting pressure gradient and a irreducible water film are considered, and flow equations of the natural gas in a tubular billet and a crack are set up; and 5) a fractal theory is introduced, a total flow calculation equation of the tubular billet and the crack is set up, the face, close to the crack, of the carbonatite obtained after acid fracturing is treatedinto a tubular billet-crack dual pore medium seepage model, and a model for calculating the permeability of the matrix after acid fracturing of the carbonatite is set up. The method for calculating the permeability of the matrix after acid fracturing of the carbonatite is provided based on the actual flowing process of the natural gas under the conditions of stress sensitivity, crack width dynamic changes, multiple pore media and the starting pressure gradient.

The invention discloses a soilless cultivation substrate for red ginger flower cultivation, which is composed of the following raw materials in parts by weight: 8-10 parts of Artemisia annua, 3-5 parts of honeysuckle, 4-6 parts of dandelion, 30-35 parts of bagasse, 5-8 parts of okara, 5-8 parts of urea, 1-3 parts of jasmonic acid, 1-3 parts of salicylic acid, 0.5-1 part of xanthan gum, 3-5 parts of orange peel and 50 parts of rice washing water. The preparation method of the red ginger flower cultivation substrate of the present invention mainly includes the steps of pulverizing traditional Chinese medicine, preparing nutrient solution, fermenting and mixing. According to the growth characteristics of the red ginger flower, the present invention enhances the effects of repelling and killing insects by adding Artemisia annua, honeysuckle and dandelion; adopts orange peel and various biological regulators to configure the nutrient solution, enriches the growth conditions of the red ginger flower. The required nutrients can promote plant growth; by adding bagasse and urea, the nutritional needs of red ginger flowers are met, the permeability and permeability of the substrate are enhanced, and the cultivation effect is good.

The invention provides a shale matrix permeability determination device and method. The device comprises a gas cylinder, a booster pump which is connected with the gas cylinder, an automatic gas supplementing and pressurizing system which is connected with the booster pump through a pressure regulating valve, and is used for supplementing and pressurizing a reference chamber and a sample chamber through gas in a gas storage tank of the booster pump under the condition that the pressure in the reference chamber and the sample chamber is identified to be smaller than a target pressure preset value in the experiment process, a temperature control device which is used for placing the reference chamber and the sample chamber used for placing a shale rock sample to be measured, and a pressure sensor which is used for measuring pressure data of the reference chamber and the sample chamber. By utilizing the scheme provided by the invention, the problem that the pressure of the whole system issharply reduced after particle gaps are filled with gas is avoided, the influence of the filling degree on permeability determination can be eliminated, the measurement error is reduced, and the accuracy of permeability determination is improved.

The invention discloses efficient cross-linking and low damage fracturing fluid. The efficient cross-linking and low damage fracturing fluid is prepared from the components in percentage by mass: 25%-65% of a thickening agent, 15%-45% of a cross-linking agent, 0.06%-1% of a PH regulator, 0.1%-0.3% of a clay stabilizer, 0.8%-2% of a discharge aiding agent, 0.5%-2% of a waterproof locking agent, 0.01%-0.06% of a bactericide, 0.01%-0.05% of a gel breaker and 40%-60% of water. The fracturing fluid uses fast dissolving guar gum (super HPG), the swelling time is smaller than 3 min, continuous blending is met, material consumption is reduced, the gel state is good, the delayed cross-linking time can be regulated, friction resistance is effectively lowered, a powdery plugging agent is adopted to realize multilayer steering in seams and between the seams, a complex seam net is formed, the compact oil and gas transformation effect is improved, by setting one or more of montmorillonite, kaolin, illite or chlorite as the clay stabilizer and starting with dissecting of different clay mineral damage mechanisms, targeted technological means are adopted, clay mineral damage caused by extraneous fluids is controlled to the utmost extent, and thus the matrix permeability is ensured.

The invention discloses a bacterial strain medium and a preparation method thereof. The bacterial strain medium solves the problems of soft and loose states of the traditional bacterial strain medium, improves base hardness and is convenient for transport and storage. Because of matrix change, physical vibration and temperature difference adaptability are improved. The traditional medium tissue structure is changed so that matrix permeability is improved and mycelia growth oxygen demands are greatly satisfied. The matrix components are changed so that a bacterial strain quality guarantee period is prolonged. The bacterial strain medium changes nutrition components of the traditional medium, has comprehensive and reasonable nutrition, improves medium base number and effectively inhibits infectious microbes. Through use of needlebush particles and sawdust, a raw material source and an application scope are widened. Inoculation efficiency is improved and a bacterial strain cost is about 1/5 that of the traditional PDA medium.

The invention discloses a method for testing matrix damage rate applied to a plugging agent. The method comprises the steps of: (a) preparing a repeated fracturing blocking agent and selecting a plurality of cores for later use; (b) respectively splitting the selected cores, and manufacturing an artificial fracture; (c) paving a layer of particulate matter inside a fracture, and simulating a fracturing fracture; (d) injecting the repeated fracturing blocking agent into an analogue fracturing fracture to stew for a period of time; (e) cleaning sand in each core after injecting the liquid, firmly bonding the fracture and determining the matrix permeability, and (f) obtaining the matrix damage rate through the measured matrix permeability. The matrix damage rate of the repeated fracturing blocking agent can be rapidly tested by the method; the method is simple in test process and accurate in test result, and the data support is provided for use of the repeated fracturing blocking agent.

The invention relates to a cross-linking reinforcing agent used for boron cross-linking modified guar gum fracturing fluid, a preparation method of the cross-linking reinforcing agent and the boron cross-linking modified guar gum fracturing fluid prepared from the cross-linking reinforcing agent, and belongs to the technical field of modified guar gum fracturing fluids. Specifically, in the embodiments of the invention, a cross-linking reinforcing agent is prepared by adopting glycerin, sodium thiosulfate and water, when the prepared cross-linking reinforcing agent is added into the boron cross-linking modified guar gum fracturing fluid, the temperature resistance and shear resistance of the fracturing liquid can be improved, a use concentration of the modified guar gum at the same temperature can be greatly reduced, a residue content after gel breaking can be reduced, damage to reservoir matrix permeability can be avoided, and the fracturing effect is improved.

The invention discloses a dual-porosity dual-permeability model and dynamic prediction method for a shale gas reservoir considering gas-water two-phase flow. Aiming at the flow of gas in a formation from an entire matrix system to natural fractures, gas-water two-phase flow exists in the matrix system and the fracture system, and the condition that the matrix permeability is corrected by the influence of an adsorbed water layer in inorganic nano-scale pores is considered, the proportion of organic matter and clay minerals and the respective adsorption and desorption constants thereof are introduced to derive a shale gas reservoir gas-water two-phase flow dual-porosity dual-permeability model; and an IMPES method and Matlab mathematical software are adopted to program and solve the two-phase, three-dimensional, dual-porosity and dual-permeability model of multistage fractured horizontal wells in the shale gas reservoir, and the dynamic changes of production pressure are accurately predicted. The invention aims to solve the technical problem that shale gas reservoir gas-water two-phase dual-medium models in the prior art cannot accurately and dynamically predict the production pressure.