A prediction method of forced self-absorption of shale clay minerals
A technology for clay minerals and shale, which is applied in soil material testing, measuring devices, instruments, etc. It can solve the problems of calculation result error, failure to consider the slip effect of capillary shape fracturing fluid, and forced external force of clay pore osmotic pressure, etc.
Active Publication Date: 2021-10-22
SOUTHWEST PETROLEUM UNIV
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, in their calculation model, the capillary is considered to be circular, and the shape of the capillary, the slip effect of the fracturing fluid, the osmotic pressure of the clay pores, and the forced external force are not considered, resulting in large errors in the calculation results.
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
example
[0109] In order to analyze the factors affecting the forced self-imbibition of shale clay minerals, sensitivity analysis was carried out using the basic data in Table 1 using the method of the present invention.
[0110] Table 1 Calculation basic parameters
[0111]
[0112] (1) Comparison of clay pore self-absorption mechanism
[0113] figure 1 It is the influence of osmotic pressure and capillary force of shale clay minerals on the self-priming length without considering the forced self-priming force. It can be seen that as the self-priming time increases, the self-priming length caused by osmotic pressure and capillary force increases gradually. Osmotic pressure has a more significant effect on self-imsorption than capillary force, and this difference gradually increases with the increase of self-imsorption time, which indicates that the effect of osmotic pressure on clay self-imsorption cannot be ignored in the study of shale clay mineral self-imsorption. Impact.
...
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 discloses a method for predicting the forced self-absorption of shale clay minerals. Firstly, the basic characteristic parameters of the shale clay minerals are obtained according to the on-site rock core; then the flow equation of the shale clay mineral sheet-like pores parallel to the flat plate capillary is established; secondly, the flow equation is established The forced self-absorption model of uniform capillary bundles of shale clay minerals; finally, the fractal theory is introduced to calculate the forced self-imsorption of clay with fractal characteristics. The present invention obtains capillary diameter size and shape distribution through mercury injection experiments on shale clay, and considers that shale clay minerals are affected by capillary force, clay pore osmotic pressure, and forced self-priming force during the fracturing process. Influenced by non-circular characteristics, boundary slip effect, clay mineral osmotic pressure and forced external force, combined with fractal theory, a shale clay shale clay pore size fractal characteristics, pore tortuosity, slip effect, and forced self-priming were established. A method for predicting forced self-absorption of minerals.
Description
technical field [0001] The invention belongs to the technical field of unconventional oil and gas development, and in particular relates to a method for predicting the forced self-absorption of shale clay minerals. Background technique [0002] Shale is a rock formed by dehydration and cementation of clay, and is mainly composed of clay minerals (kaolinite, hydromica, etc.), with obvious thin bedding structure. Shale reservoirs are characterized by low porosity, low permeability, and difficult production. Large-scale volume fracturing is a key technology for developing shale gas. Under the action of capillary force on gas-rich shale clay, fracturing fluid will enter the capillary through forced self-absorption. In addition to the microscale effect, pore tortuosity, and fractal characteristics of pore size distribution, the forced self-imsorption of shale clay (inorganic matter) has its own particularity in pore structure characteristics and self-imsorption force: During th...
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 Patents(China)
IPC IPC(8): G01N13/02G01N13/04G01N15/08G01N33/24
CPCG01N13/02G01N13/04G01N15/0826G01N15/088G01N33/24G01N2013/0208
Inventor 曾凡辉郭建春范宇宋毅岳文瀚王磊段蕴琦
Owner SOUTHWEST PETROLEUM UNIV