Method for calculating water saturation of porous medium
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A calculation method and technology of porous media, applied in calculation, seismology for logging records, special data processing applications, etc., can solve problems such as large errors in calculation results
Inactive Publication Date: 2012-07-11
SOUTHWEST PETROLEUM UNIV
View PDF3 Cites 26 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0020] Analyzing the existing problems of the original calculation method: the debate on Archie’s formula has a long history, and there are two main views: the first view is that Archie’s formula is just an empirical formula, which is an empirical simulation of the relationship between rock electrical properties and water saturation. The second point of view is that each parameter in Archie’s formula has physical meaning, and the two parameters a and b reflect the pore structure of the rock
[0021] In summary, the original method for calculating the water saturation of porous media has flaws in theory and logic, which will lead to 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 more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0093] It is known that in an oilfield where water injection development has ended, the sandstone reservoir at a depth of 1435m has a porosity Φ=23.92%, a permeability k=153.3mD, and an apparent resistivity R t = 1.638Ω·m. The well R is known from the water analysis data w =0.066Ω·m; regional rock electricity experiment (such as figure 2 ) to get: a=1.167, m=1.87, b=1.138, n=1.72. Calculate the water saturation of the reservoir.
[0094] (1) The regional lithoelectric test data of the reservoir are as follows: figure 2 , image 3 As shown, and it is known that the reservoir has been developed through long-term water injection, it can be determined that the reservoir rock is hydrophilic.
[0095] (2) Refitting figure 2 data in ( figure 2 dotted line in ) to get m=2, then calculate the formation factor F of the reservoir:
[0096] F=φ -2 =0.2392 -2 =17.48
[0097] (3) According to image 3 From the experimental data, the parameter a′ varies with the water saturat...
Embodiment 2
[0107] It is known that the porosity of a certain unconsolidated sandstone is Φ=24%, the permeability k=2100mD, and the formation factor F=12.4. The resistivity R of the experimental formation water w =0.21Ω·m; the rock electrical experiment data of the rock sample are as follows Figure 4 . Calculate the apparent resistivity R t =7.2Ω·m, the water saturation of the rock sample.
[0108] (1) The I-S of the rock-electric experiment of the rock sample w data such as Figure 4 shown. According to the self-priming method in the industry standard SY / T 5153-2007, the relative wettability index of the rock sample is measured to be 0.58, which can be judged that the rock sample is hydrophilic.
[0109] (2) The stratigraphic factor F of this rock sample is known, so there is no need to calculate F again.
[0110] (3) According to Figure 4 From the experimental data, the parameter a′ varies with the water saturation S w The changing relationship:
[0111] ...
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 method for calculating water saturation of a porous medium, which is an explanation method of geophysical electrical logging data and sequentially comprises the steps of (1) selecting and cutting a rock sample, performing an rock electrical experiment on an A section rock sample, and applying a B section rock sample to wettability measurement; (2) calculating a formation factor F; (3) calculating a parameter a' and fitting change relation of the a' along with Sw; and (4) calculating the water saturation Sw. The parameter a' has clear physical significance, describes influence of the distribution of a pore structure and the pore fluid of the porous medium on a resistance increase coefficient, and changes along with the changes of the water saturation. Due to the fact that a water saturation calculation formula in the method defines the influence of the distribution pattern of the pore structure and the pore fluid in pores on the resistance increase coefficient I, calculating results are accurate, the explanation method and the technique of geophysical electrical logging are perfected, and a basis and a means are provided for quantitative calculation of the water saturation of a reservoir stratum.
Description
technical field [0001] The present invention relates to the calculation method of rock electrical properties and rock water saturation, especially the quantitative calculation of water saturation of oil and gas reservoirs based on rock electrical experiment data and electrical logging data, which is a kind of geophysical electrical logging data explain the method. Background technique [0002] Porous media widely exists in nature and human society, such as sedimentary rocks, metamorphic rocks, igneous rocks and artificial rock materials in natural rocks. A large amount of oil, gas, and water resources are stored in underground rock formations. These resources are usually detected and evaluated by geophysical methods. The most widely used method is to use electrical logging technology combined with petrophysical experiments to measure oil and gas saturation. Evaluation, this method is applied to all stages of oil and gas reservoir exploration and development. [0003] Accor...
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
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more