Water-sand two-phase permeability parameter calculation method in water driving sand test
Inactive Publication Date: 2015-05-27
HUADIAN COAL IND GRP +1
View PDF1 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Therefore, it is inappropriate to calculate the permeability parameters during the water flooding test by referring to the method of the water flooding test, and it is necessary to construct a calculation method for the permeability parameters during the water flooding test that is different from the water flooding test. yes, urgent
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0130] 1 Experimental data processing
[0131] Change the test data into four columns, the first column is time, the unit is s; the second column is pressure (difference), the unit is MPa; the third column is water flow, the unit is l / h, and the fourth column is sand loss Rate kg / h. According to these three arrays, the time series curves of pressure gradient, water seepage velocity and sand seepage velocity can be drawn, see figure 1 .
[0132] 2 Enter the relevant parameters
[0133] Enter the relevant parameters, including the following categories:
[0134] (1) The mass density of water m 1 , dynamic viscosity μ 1 ;
[0135] (2) Mass density of sand m 2 , the consistency coefficient C and the power exponent n;
[0136] (2) Rock sample radius r rock , natural stacking height h 0 , height h after compression, mass of broken rock M rock , sand quality M sand ;
[0137] (3) Sampling period τ, data length N;
[0138] (4) The maximum allowable error ε of the Newton t...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a water-sand two-phase permeability parameter calculation method in a water driving sand test. The fluidity of a water phase and a sand phase, a non-Darcy flow beta factor and an accelerated speed coefficient are calculated according to a pressure gradient time sequence, a water flow time sequence and a sand flow time sequence. The water-sand two-phase permeability parameter calculation method is realized by the following steps: calculating a water permeability speed time sequence, a sand permeability speed time sequence and the pressure gradient time sequence; establishing time sequences of water-phase and sand-phase permeability speed local derivatives; calculating volume fractions of a water phase and a sand phase of each sampling moment; establishing an algebraic equation of a water flow speed and a sand flow speed of each sampling moment; calculating time sequences of the non-Darcy flow beta factors and the accelerated speed coefficients of the water phase and the sand phase; calculating the time sequences of water-phase and sand-phase permeability speeds; and comparing errors of calculation values of the water-phase and sand-phase permeability speeds and actually-measured values to obtain a testing value of a permeability parameter of water-phase and sand-phase flows of crushed rocks.
Description
technical field [0001] The invention relates to coal mine geological disasters and their prevention and control, in particular to a method for calculating permeability parameters of water-sand two-phase flow in water-sand drive tests. Background technique [0002] In the Mu Us Desert, the coal seam has the characteristics of small buried depth and thick sand on the surface. During the coal mining process, the sand layer on the surface moves along with the surface water along the overburden of the coal seam to the goaf. In order to study the mechanism of water and sand inrush caused by overlying rock damage in the process of coal seam mining, prevent the occurrence of water and sand inrush, or reduce the harm of water and sand inrush, a broken rock water flooding test (that is, the use of water to expel water from the pores of broken rocks) was carried out. fine sand test). Due to the gradual decrease of the volume fraction of sand in the pores of broken rock during the pro...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 杜锋兰毅马丹倪晓燕王秀林杨宝智汪青仓
Owner HUADIAN COAL IND GRP