Joint characterization method of pore size distribution in tight sandstone
A technology of pore size and tight sandstone, which is applied in the fields of suspension and porous material analysis, material analysis, permeability/surface area analysis, etc. Determine the most effective characterization interval of tight sandstone pore size to achieve a wide range of distribution
Active Publication Date: 2021-11-16
SOUTHWEST PETROLEUM UNIV
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The above four methods alone are difficult to determine the most effective characterization range for tight sandstone pore diameter, and cannot reasonably characterize the full pore diameter of tight sandstone, which greatly affects the objectivity of tight sandstone reservoir evaluation
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
[0029] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.
[0030] A joint characterization method for tight sandstone pore size distribution, the method mainly includes the following steps:
[0031] S1. First, the tight sandstone is made into a cylinder with a diameter of 2.5 cm and a length of 5 cm by using a coring bit and a core cutting device, and then dried and dehydrated.
[0032] S2. Put the sample in the container to vacuum for 6 hours, and then pressurize the formation water under the condition of 40MPa for 6 hours. The sample measured in this experiment was treated with saturated formation water, and the salinity was 16000mg / L. After that, the core was taken out for further analysis. NMR test.
[0033] S3. After the NMR test, a long core column with a length of 2 cm was cut from the core sample in S2, and placed in a 110°C...
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
| Property | Measurement | Unit |
|---|---|---|
| diameter | aaaaa | aaaaa |
| pore size | aaaaa | aaaaa |
| surface tension | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses a joint characterization method of tight sandstone pore size distribution, which comprises the following steps: S1, drying and dehydrating the tight sandstone; S2, performing NMR test on the core sample saturated with water; S3, after the NMR test, performing High-pressure mercury injection analysis, using the Washbum equation to obtain the pore size distribution results of high-pressure mercury injection; S4, drill a small core column, dry and dewater for XCT experiments; S5, grind the remaining core samples in S4 after drying and dewatering It is used for low-pressure nitrogen adsorption; S6, after degassing the sample that has been adsorbed by low-pressure nitrogen in S5, it is used for carbon dioxide adsorption test; S7, the conversion coefficient is obtained by fitting the pore size distribution obtained by high-pressure mercury intrusion and NMR data, which can be Converting the T2 relaxation time distribution of NMR into pore size; S8, splicing and combining the measured data to obtain the pore size distribution of tight sandstone. This method can reasonably characterize the full pore diameter of tight sandstone, which ensures the objectivity of tight sandstone reservoir evaluation.
Description
technical field [0001] The invention relates to an unconventional oil and gas exploration and development technology, in particular to a joint characterization method for tight sandstone pore size distribution. Background technique [0002] Due to the complex pore structure caused by tight sandstone deposition and diagenesis, and the large-scale distribution of pore sizes, the existing methods for studying the pore size distribution of rocks cannot completely and accurately describe the pore size distribution. The representative methods are MICP, N2-LPAI, NMR, XCT, and CO2 adsorption, but these methods have their own limitations and shortcomings, especially for tight sandstones that have a wide range of pore size distribution and are not Very homogeneous sandstone. The pore-throat size measured by MICP technology cannot distinguish between pores and throats, and the smallest pore tested depends on the maximum injection pressure. For tight sandstone, when testing the nano-sc...
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): G01N15/08
CPCG01N15/088
Inventor 张烈辉雷强唐洪明赵玉龙郭晶晶唐慧莹
Owner SOUTHWEST PETROLEUM UNIV