35 results about "Filtration coefficient" patented technology

The invention relates to a parameter measuring method of a water conservancy engineering material, and particularly relates to a method for measuring a filtration coefficient of oversized-grain-diameter coarse-grained soil (the grain diameter d85 of which is more than or equal to 60mm and is less than or equal to 100 mm), and the IPC international patent classification is E02D1 / 04 and E02D33 / 00. The method provided by the invention adopts a specialized measuring device which comprises a testing tank, an automatic compression system 11 and a pressure measuring tube 12, wherein the wall of the testing tank is provided with multiple pressure measuring holes, the pressure measuring holes in the tank wall are utilized as vent holes in soil body exhaust saturation and can cooperate with vent holes in the tank top and the tank bottom to accelerate ventilation, and thus a sample rapidly achieves a saturation condition. A large number of tests prove that the measuring method provided by the invention has the advantages that hot water at 25-40 DEG C is utilized to saturate the oversized grain diameter sample rapidly, and the influence to chemical and physical stability of the sample is smallest.

The invention discloses a fracturing fluid filtration rate prediction method. The fracturing fluid filtration rate prediction method sequentially includes the steps that (1) rock cores of specific stratums are manufactured into standard experiment rock cores needed by a high-temperature and high-pressure filtration instrument, a fracturing fluid filtration experiment is carried out at the needed temperature and pressure, the sectional areas A of the experiment rock cores and the filtration amount Q of fracturing fluid passing through the rock cores of the stratums in a certain time t are measured, and the unit area filtration rate v of the specific stratums is obtained according to v=Q / (t*A); (2) according to variable index fracturing fluid filtration rate calculation formula (please see the specification for the calculation formula) related to the specific stratums and the fracturing fluid, undetermined indexes b and filtration coefficients c are calculated, a calculation formulas of the specific stratums and the specific fracturing fluid filtration rate are obtained, and the fracturing fluid filtration rate is accordingly predicted. The fracturing fluid filtration rate prediction method is reliable in principle and easy to operate, the rate of filtration of the fracturing fluid to the stratums can be accurately predicted, theoretical foundations and technology supports are provided for improving the fracturing fluid efficiency and reducing the construction risks in fracturing design, and the fracturing fluid filtration rate prediction method has the good market prospect.

The invention discloses a fracturing fluid filtration rate prediction method. The fracturing fluid filtration rate prediction method sequentially includes the steps that (1) rock cores of specific stratums are manufactured into standard experiment rock cores needed by a high-temperature and high-pressure filtration instrument, a fracturing fluid filtration experiment is carried out at the needed temperature and pressure, the sectional areas A of the experiment rock cores and the filtration amount Q of fracturing fluid passing through the rock cores of the stratums in a certain time t are measured, and the unit area filtration rate v of the specific stratums is obtained according to v=Q / (t*A); (2) according to variable index fracturing fluid filtration rate calculation formula (please see the specification for the calculation formula) related to the specific stratums and the fracturing fluid, undetermined indexes b and filtration coefficients c are calculated, a calculation formulas of the specific stratums and the specific fracturing fluid filtration rate are obtained, and the fracturing fluid filtration rate is accordingly predicted. The fracturing fluid filtration rate prediction method is reliable in principle and easy to operate, the rate of filtration of the fracturing fluid to the stratums can be accurately predicted, theoretical foundations and technology supports are provided for improving the fracturing fluid efficiency and reducing the construction risks in fracturing design, and the fracturing fluid filtration rate prediction method has the good market prospect.

The invention relates to a method of removing spike noise from ground nuclear magnetic resonance data based on synergic filtration. The method comprises the steps of judging whether all measurement data under a pulse moment has the spike noise through a 3 sigma rule, dividing the measurement data into a group containing the spike noise and a group containing no spike noise, performing discrete cosine transform and Hadamard transform to form two transform domain coefficients, calculating a filtration coefficient through the transform coefficient of the data without the spike noise, performing filtration on the coefficient of the data containing the spike noise, and at last, performing Hadamard and discrete cosine inverse transform on the filtered coefficient of the data containing the spikenoise to remove the spike noise. According to the method, the data containing a spike noise time period is not deleted or replaced, and a relaxation attenuation characteristic of a ground nuclear magnetic resonance signal is not changed. Through testing, the method has high accuracy of removing the spike noise from the ground nuclear magnetic resonance data and improves extraction precision of asignal characteristic parameter.

The invention provides a drain board filter cloth manufacturing technique and a prepared filter cloth, and relates to the technical field of drain board filter cloth production. The method is mianly used for improving filtration coefficients of the drain board filter cloth to enhance the water absorption capability of the drain board filter cloth. According to the drain board filter cloth manufacturing technique, a liquid chemical spraying process is added between a spun-laid process and a hot pressing roller process of a traditional filter cloth production line. By means of a spraying device, a liquid chemical which is formed by mixing a hydrophilic agent with water in the proportion of 8:100 is evenly sprayed on the surface of the filter cloth in a mist mode. The drain board filter cloth manufacturing technique increases the filtration coefficients of the filter cloth on the basis that immovable original parameters and original production processes of the filter cloth are not changed, resource are saved, and the overall working performance of a drain board is improved.

A washing method of an air-water backwashing surface of filter materials of a natural filtering bed and a washing control system thereof are provided by the present invention. By the use of air lift generated by compressed air, piping generated by water power and separation generated by the mixture of the air and the water, the compact filter materials and a silt layer covered on the natural filtering bed are dispersed to cause the recombination of the filter materials. Meanwhile, with the running of river water, the silt with light weight and sediment are discharged out of the filtering bed, thus increasing the filtration coefficient of a permeable layer and the vertical infiltration velocity of surface water to underground. The control system comprises a seepage well of the natural filtering bed, an air distribution system which generates the air lift and a water distribution system and a control system which generate the piping. By adopting the method and the system of the invention, a water plant is moved to the underground, thus saving investment, occupying less area, having low operation cost, meeting the requirements of environmental engineering, increasing water yield and improving water quality.

A method for on-site discrimination of T-shaped fracture formation risks and a corresponding fracturing process belong to the technical field of hydraulic fracturing in oil and gas fields. A method for on-site discrimination of T-shaped fracture formation risks, comprising the following steps: (1) the first perforation adopts a single-stage perforation method, and the perforation length is 1-3m; (2) small-scale fracturing tests and pressure drop analysis are carried out, The pressure drop test time is more than 1.5-2.0 times of the small-scale fracturing construction time; (3) Calculate the pump stop pressure gradient and fracturing fluid loss coefficient; (4) If the pump stop pressure gradient is greater than 0.023MPa / m, and the fracturing If the fluid loss coefficient is 1-2 orders of magnitude higher than the matrix fluid loss coefficient, the risk of T-shaped seam formation is high. For mines with a high risk of T-shaped fractures, it is important to improve the productivity of shale gas wells by optimizing perforation methods and fracturing parameters to improve fracture creation efficiency, form vertical fractures as much as possible, and avoid forming a large number of horizontal fractures and T-shaped fractures. significance.

The embodiment of the present invention provides a method and equipment for evaluating the fluid production contribution rate of a single-stage fracture based on pressure drop data. The method includes: determining the reservoir closure pressure of the target well; The expression of reservoir fluid loss coefficient is determined by formula; the maximum fracture height is determined by solving the fracture height equation; the maximum fracture width is determined according to the maximum fracture height and reservoir closure pressure, and the average fracture width is determined according to the maximum fracture width; Reservoir fluid loss coefficient expression, maximum fracture height and maximum fracture width, determine the fracture length, and determine the half-fracture length; according to the measured fracture porosity, formation thickness, fracture liquid phase pressure, liquid phase viscosity, liquid phase volume coefficient, Bottomhole pressure, as well as the average fracture width and half-fracture length, determine the fluid production of the target fracture; determine the contribution rate of the target fracture according to the fluid production of the target fracture and the total fluid production at the bottom of the hole, and can accurately evaluate a single section The fluid production contribution rate of fractures is low, and the cost is low.

The invention discloses a calculation method for dynamic comprehensive filtration coefficient of fracturing acidizing in fractured reservoir. The calculation method for dynamic comprehensive filtration coefficient of fracturing acidizing in fractured reservoir comprises the following steps that: (1) calculating a matrix filtration coefficient Cmt of the considering acid wormhole; (2) calculating the natural fracture filtration coefficient (Cft0) (i) i ( / i) in initial state and the comprehensive filtration coefficient Ct0 of the fracturing acidizing in initial state; (3) calculating the effective operating distance (Lefn) (i) i ( / i) of the acid liquor in the i natural fracture of a Tn time step; (4) calculating the i natural fracture width (wn) (i) i ( / i) of the Tn time step; (5) calculating the filtration coefficient (Cftn) (i) i ( / i) of the i natural fracture of the Tn time step; (6) calculating the comprehensive filtration coefficient Ctn of the fracturing acidizing of the Tn time step. The calculation method for dynamic comprehensive filtration coefficient of fracturing acidizing in fractured reservoir considers the natural fracture width variation caused by the acidliquor corrosion on the wall surface of the natural fracture, the principle is reliable, the calculation is simple, the natural fracture with random and complicated distribution can be processed, thefiltration speed of the acid liquor in the fracturing acidizing process can be accurately and quickly calculated, thereby providing an effective guidance for the design of the fracturing acidizing scheme.

The invention belongs to the technical field of unconventional oil and gas stimulation, and in particular relates to a method for measuring the fluid loss coefficient of supercritical carbon dioxide fracturing fluid, which is used for determining the fluid loss coefficient of supercritical carbon dioxide fracturing fluid. The method for measuring the fluid loss coefficient of supercritical carbon dioxide fracturing fluid, the steps are as follows: (1), place the rock core, (2), discharge the gas in the upper cavity of the intermediate container, and fill the upper cavity of the intermediate container with methane, (3), Apply pressure to the lower cavity of the intermediate vessel, (4), inject methane into the rock core, (5), empty the methane in the upper cavity of the intermediate vessel and inject carbon dioxide, (6), apply confining pressure, (7), apply back pressure, ( 8), injecting carbon dioxide into the rock core, (9), calculating the filtration rate and filtration coefficient. The temperature and pressure of the method of the invention can be adjusted to meet the high-temperature and high-pressure environment requirements in which the carbon dioxide reaches a supercritical state, and can truly study the filtration law of the supercritical carbon dioxide fracturing fluid under different temperature and pressure conditions.

The invention discloses a socialized filtering method on the basis of a preference model and mainly solves the problems of a great amount of targeted users, a complex social relationship and low accuracy of a filtering method in the prior art. The invention adopts the implementation scheme that the socialized filtering method on the basis of the preference model comprises the following steps of: calculating an influence factor of group members on a group by analyzing a socialization relationship among the group members; calculating an influence factor of preference objects of the group members to the group by analyzing the distribution of the preference objects of the group members in the group; integrating the two influence factors and carrying out character representation on the preference model of the group together to obtain a weighted influence vector of the group; and then calculating a filtration coefficient and judging the recommended condition to filter the common and like preference of the group, so that the accuracy and the efficiency of the socialized filtering method are improved. The socialized filtering method has the advantage of analysis on the preference model ofthe group. The recommendation of objects in different fields can be realized on the Internet only by modifying and acquiring keyword vectors in the fields.

The invention discloses a method for testing filtration loss of rough natural fracture fracturing fluid. The method comprises the following steps: manually drilling an outcrop of a construction site of a target oil field to obtain a cylindrical rock core; treating the cylindrical rock core, and then conducting artificial fracture forming on the cylindrical rock core in an artificial fracture cutting mode; scanning cracks of the cylindrical rock core to obtain a crack profile map of the cylindrical rock core; calculating the surface roughness of each crack surface; conducting a displacement experiment on the cylindrical rock core subjected to fracture forming; according to the filtration loss time and the accumulated filtration loss of the filtration loss, making a filtration loss and time square root relational graph; according to the filtration loss and time square root relational graph, obtaining a linear relational expression of the filtration loss and time square root and the slope and intercept of a straight line; and according to the cross sectional area of the rock core, the slope of the straight line and the intercept, obtaining the filtration coefficient, the filtration velocity and the initial filtration amount through calculation. According to the method, the filtration law of the fracturing fluid in the natural crack can be accurately obtained, and a basis is provided for hydraulic fracturing during subsequent site construction.

An embodiment of the invention is applicable to the communication field and provides a data processing method, a data processing device and a terminal. The data processing method comprises the following steps of obtaining page data which is corresponding to an application program; obtaining a color filtration coefficient of the application program, wherein the color filtration coefficient comprises a blue component filtration coefficient; filtering the obtained page data according to the color filtration coefficient of the application program; outputting the page data after filtration. The data processing method can reduce damage to human eyes from the blue components of the web data.