Quantitative in-situ evaluation method of pore connectivity during cementing slurry solidification
A cementing cement slurry and cement slurry technology, applied in the direction of drilling composition, chemical instruments and methods, measuring devices, etc., can solve the problem of low cement slurry strength, difficulty in testing the pore connectivity and damage of cement slurry grout etc.
Active Publication Date: 2022-04-12
SOUTHWEST PETROLEUM UNIV
View PDF11 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, both mercury porosimetry and nitrogen adsorption method require drying samples, because the cement slurry in the waiting stage has low strength and no fixed shape, the drying process will seriously damage the pore structure of cement slurry, thus making it difficult to use mercury injection method and nitrogen adsorption method. To test the pore connectivity of cement slurry during the waiting process
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
[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.
[0028] Such as figure 1 As shown, a quantitative in-situ evaluation method for pore connectivity in the solidification process of cement slurry includes the following steps:
[0029] (1) The sample weighs 800g of high sulfate-resistant G-grade oil well cement, 16g of fluid loss reducer and 352g of water, and prepares cement slurry according to the GB / T19139-2012 standard;
[0030] (2) Take about 150mL of cement slurry into a beaker, immerse the beaker containing the cement slurry in a 30°C water bath and fix it; then insert an inductive conductivity meter (DM-200, Yantai Kaimeisi Instrument Co., Ltd.) into the cement slurry, Start to collect the cement slurry resistivity (ρ(t)), until it is hydrated for 20 hours;
[0031] (3) Take 400mL of cement slur...
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 |
|---|---|---|
| density | aaaaa | aaaaa |
| electrical resistivity | aaaaa | aaaaa |
| porosity | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses a quantitative in-situ evaluation method for pore connectivity in the solidification process of well cement slurry, comprising: determining the formation factor of cement slurry by in-situ testing the resistivity of well cement slurry and the resistivity of cement slurry pore solution; The in-situ test of the hydrogen proton transverse relaxation time and magnetization signal in pore water by low-field nuclear magnetic resonance technology can calculate the porosity of cement slurry; finally, based on the formation factor and porosity of cement slurry, multiphase phenomenology The pore connectivity of the plastic state of the cementing slurry can be obtained by using the model. The invention has the advantages of proposing a quantitative evaluation method for pore connectivity during the solidification process of cement slurry, which is of great significance for studying the early gas channeling mechanism of oil and gas well cementing and developing cementing anti-gas channeling materials and technologies.
Description
technical field [0001] The invention belongs to the field of cementing engineering of oil and natural gas wells, and in particular relates to a quantitative in-situ evaluation method for pore connectivity in the solidification process of cementing cement slurry. The channeling slurry system and technology are of great significance. Background technique [0002] Cement-based materials have been widely used in oil and gas well cementing operations. The hydrostatic column pressure of liquid cement slurry is required to balance the high pressure of the formation fluid, and the hardened cement sheath can effectively seal the formation fluid. However, during the cementing process, as the cement slurry hydration process increases, its hydrostatic column pressure decreases (also known as "weightlessness" in the industry), which will provide a driving force for formation fluid to escape into the annular cement slurry, resulting in "early channeling". flow" problem. However, if the ...
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): G01N15/08C09K8/46
CPCG01N15/088C09K8/46
Inventor 刘开强方晓东倪华峰贺彬黄子玲兰小林夏阳李治唐思诚李真张世豪
Owner SOUTHWEST PETROLEUM UNIV