Abstract: The present invention discloses a method for evaluating fracture connectivity and optimizing fracture parameters based on complex network theory, comprising the following steps: obtaining natural fracture distribution laws and characteristic parameters of the formation based on previous knowledge of natural fractures in the formation and statistical analysis of fractures in the core, and establishing a discrete fracture network model of natural fractures based on the previous step; setting up hydraulic fractures, determining intersection relations in the fracture network and coordinates of intersection points of fractures: converting the actual fracture network into a complex network dual topology diagram based on complex network theory, and calculating evaluative indexes of the complex network to realize the evaluation of fracture network connectivity; changing the hydraulic fracture parameters to get the evaluation indexes of different hydraulic fracture schemes.

Abstract: The present invention discloses a method for evaluating fracture connectivity and optimizing fracture parameters based on complex network theory, comprising the following steps: obtaining natural fracture distribution laws and characteristic parameters of the formation based on previous knowledge of natural fractures in the formation and statistical analysis of fractures in the core, and establishing a discrete fracture network model of natural fractures based on the previous step; setting up hydraulic fractures, determining intersection relations in the fracture network and coordinates of intersection points of fractures; converting the actual fracture network into a complex network dual topology diagram based on complex network theory, and calculating evaluative indexes of the complex network to realize the evaluation of fracture network connectivity; changing the hydraulic fracture parameters to get the evaluation indexes of different hydraulic fracture schemes.

Abstract: The present invention discloses a gas flow rate analysis and prediction method for wellhead choke of gas well based on Gaussian process regression, comprising the following steps of Step 1) acquiring basic data of the wellhead choke on site, Step 2) selecting a kernel function, Step 3) calculating a covariance matrix, Step 4) testing the Gaussian process regression model with the test data sample to calculate a prediction deviation, Step 5) selecting different kernel functions, repeating Steps 2-4, comparing prediction deviations of the different kernel functions, and Step 6) analyzing and predicting the gas flow rate of the wellhead choke of the gas well to be tested. According to the method, the data of the wellhead choke of the gas well can be processed effectively, and the gas flow rate can be predicted accurately under the condition that there is gas-liquid flow rate in the wellhead choke.

Abstract: The present invention relates to a channel fracturing method with alternative injection of conventional and capsule-type soluble proppants. The method includes the following steps: injecting pad fluid into a wellbore to break a formation and form fractures in the formation; alternately injecting a sand-carrying fluid containing conventional proppant and a sand-carrying fluid containing capsule-type soluble proppant into the wellbore in sequence to support fractures in the formation and continue to fracture the formation; injecting displacement fluid into the wellbore to completely displace the sand-carrying fluids in the wellbore into the fractures. The conventional proppant of less dosage is used. The capsule-type soluble proppant is less difficult to be developed and its solubility is sensitive to the fracture closure, which is conducive to the quick flowback after fracturing.

Abstract: The present invention relates to a channel fracturing method with alternative injection of conventional and capsule-type soluble proppants. The method includes the following steps: injecting pad fluid into a wellbore to break a formation and form fractures in the formation; alternately injecting a sand-carrying fluid containing conventional proppant and a sand-carrying fluid containing capsule-type soluble proppant into the wellbore in sequence to support fractures in the formation and continue to fracture the formation; injecting displacement fluid into the wellbore to completely displace the sand-carrying fluids in the wellbore into the fractures. The conventional proppant of less dosage is used. The capsule-type soluble proppant is less difficult to be developed and its solubility is sensitive to the fracture closure, which is conducive to the quick flowback after fracturing.

Abstract: A method for assaying the antioxidant capacity of a skin care product, the method including preparing an emulsion base, dissolving a sample of a skin care product into the emulsion base to form a homogeneous emulsion mixture, adding a detection probe to the homogeneous emulsion mixture, adding reactive oxygen species generator and/or reactive nitrogen species generator to the homogeneous emulsion mixture, measuring the fluorescence intensity change of the detection probe in the presence of the sample over time, in the presence of the standard over time, and in the presence of a blank over time, and calculating the initial rate of oxidation of the detection probe to determine the antioxidant capacity of the sample of the skin care product.

Abstract: A method for assaying the antioxidant capacity of a skin care product, the method including preparing an emulsion base, dissolving a sample of a skin care product into the emulsion base to form a homogeneous emulsion mixture, adding a detection probe to the homogeneous emulsion mixture, adding reactive oxygen species generator and/or reactive nitrogen species generator to the homogeneous emulsion mixture, measuring the fluorescence intensity change of the detection probe in the presence of the sample over time, in the presence of the standard over time, and in the presence of a blank over time, and calculating the initial rate of oxidation of the detection probe to determine the antioxidant capacity of the sample of the skin care product.