Method for determining plastic volume shrinkage of cement paste

A technology of volume shrinkage rate and determination method, applied in the direction of material inspection products, etc., can solve problems such as inability to accurately measure the shrinkage and expansion of cement slurry, inability to meet the research needs of gas channeling prevention, and inability to simulate bottom hole temperature and pressure conditions.

Active Publication Date: 2014-02-05
SOUTHWEST PETROLEUM UNIV
View PDF4 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the experimental simulation test device is mainly used to test the volume shrinkage rate of cement slurry after solidification, that is, the volume shrinkage rate of cement stone after final setting, and there are few instruments for testing the volume shrinkage rate of cement slurry in the whole process of setting
In addition, due to the limitations of the existing test instruments that cannot simulate t

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
  • Method for determining plastic volume shrinkage of cement paste
  • Method for determining plastic volume shrinkage of cement paste
  • Method for determining plastic volume shrinkage of cement paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0092] Further illustrate the present invention below in conjunction with accompanying drawing.

[0093] A method for determining plastic volume shrinkage of cement slurry, comprising the following steps in sequence:

[0094] (1) Obtain relevant size parameters of casing and wellbore: casing inner radius r i =78.55mm, outer radius r o =88.9mm (d i =177.8mm), borehole radius r w =107.95mm (d w =215.9mm);

[0095] (2) Obtain the relevant mechanical parameters of casing and formation rock: elastic modulus E of casing case =206.9GPa, Poisson's ratio μ case =0.3, the elastic modulus E of formation rock f =13.84GPa, Poisson's ratio μ f =0.287;

[0096] (3) Determine the relevant working condition parameters of oil and gas wells: including well depth H=5085m, formation pressure coefficient P T =0.0225MPa / m, electric logging temperature T=122℃, drilling fluid density ρ d =2.30g / cm 3 , cement slurry density ρ s =2.35g / cm 3 , water-solid ratio w / s=0.263;

[0097] (4) Comb...

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

No PUM Login to view more

Abstract

The invention discloses a method for determining the plastic volume shrinkage of cement paste. The method sequentially comprises the following steps of (1) acquiring relevant size parameters of a casing and a well; (2) acquiring relevant mechanical parameters of the casing and stratum rock; (3) determining relevant working condition parameters of an oil-gas well; (4) calculating a reservoir pressure and an initial fluid column pressure of the cement paste; (5) calculating an isothermal compressibility of the cement paste; (6) preparing the cement paste, performing a weight loss experiment, and determining the final setting time; (7) determining a pore pressure descending curve under the actual working condition according to the similarity comparison principle; and (8) calculating the plastic volume shrinkage of the cement paste. A plastic volume shrinkage mathematic model of the cement paste comprehensively considers the actual stress working conditions of the underground casing and the stratum and the weight loss performance of the cement paste, is simple in principle and simple in operation, is capable of effectively determining the plastic volume shrinkage change principle of the cement paste in a condensation process, and provides a scientific method for determining the plastic volume shrinkage of the cement paste.

Description

technical field [0001] The invention relates to a method for determining the plastic volume shrinkage rate of cement slurry in the well cementing process in the field of oil and gas field development. Background technique [0002] Cement slurry volume shrinkage refers to the total volume change of cement slurry in the process of gradually changing from liquid to solid under the temperature and pressure conditions at the bottom of the well after cementing, and in the whole process of later production. Studies have shown that the volume shrinkage of cement paste is mainly caused by the hydration reaction, because the volume of the hydrate generated by the hydration reaction is smaller than the mixed volume of water and cement particles. With the progress of the hydration reaction, the liquid cement slurry gradually solidifies into solid cement stone, which needs to go through four stages: liquid phase, gelation, solidification and hardening. Therefore, the volume shrinkage of...

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
no application Login to view more
IPC IPC(8): G01N33/38
Inventor 李进李早元郭小阳程小伟李明刘健辜涛黄盛林銮谢和
Owner SOUTHWEST PETROLEUM UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap