Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

High-strength low-freedom water low-density oil well cement paste

A technology of low-density cement and oil well cement, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of good controllability, achieve high strength, small free water, and easier thickening time The effect of control

Active Publication Date: 2012-05-23
COSL CHEM TIANJIN
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a low-temperature, high-strength, low-free water and low-density cement slurry for well cementing, which avoids the shortcomings of conventional low-temperature and low-density cement slurry, and has good controllability and simple operation procedures.

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
  • High-strength low-freedom water low-density oil well cement paste
  • High-strength low-freedom water low-density oil well cement paste
  • High-strength low-freedom water low-density oil well cement paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1 1.52g / cm 3 Grout

[0014] First prepare the fluid loss reducer, according to 70g of polyvinyl alcohol, AMPS\AM\AA (2-acrylamido-2-methylpropanesulfonic acid / acrylamide / sodium acrylate) polymer 10.0g, crosslinking agent 15g, dispersion 5g of each component was weighed. The preparation steps are as follows: Pour polyvinyl alcohol into a 200ml beaker, then add AMPS\AM\AA (2-acrylamido-2-methylpropanesulfonic acid / acrylamide / sodium acrylate) polymer, crosslinking agent, dispersion The agents were poured into the beaker in turn; then stirred for 20 minutes to mix well. The prepared mixture is a fluid loss reducer.

[0015] Secondly, prepare the cement slurry: use a cement slurry mixing cup to measure 290g of seawater, 2g of retarder, 10g of dispersant, and 1.5g of defoamer to make mixed water, and put it on the Varin mixer at a constant speed of 4000 rpm while stirring. Add 615g of solid low-density cement materials (including 400g of G grade oil well cement, 1...

Embodiment 2

[0021] Example 2 1.50g / cm 3 Grout

[0022] First prepare the fluid loss reducer, according to 70g of polyvinyl alcohol, AMPS\AM\AA (2-acrylamido-2-methylpropanesulfonic acid / acrylamide / sodium acrylate) polymer 10.0g, crosslinking agent 15g, dispersion 5g of each component was weighed. The preparation steps are as follows: Pour polyvinyl alcohol into a 200ml beaker, then add AMPS\AM\AA (2-acrylamido-2-methylpropanesulfonic acid / acrylamide / sodium acrylate) polymer, crosslinking agent, dispersion The agents were poured into the beaker in turn; then stirred for 20 minutes to mix well. The prepared mixture is a fluid loss reducer.

[0023] Secondly, according to: G grade oil well cement 400g, seawater 320g, retarder 2g, defoamer 1.5g, fluid loss reducer 9g, dispersant 8g, lightening material 100g, ultrafine cement 60g, ultrafine slag 46g weigh each Components, all the other embodiments are the same as in Example 1.

[0024] The test results of the low-temperature, high-strengt...

Embodiment 3

[0027] Example 3 1.48g / cm 3 Grout

[0028] First prepare the fluid loss reducer, according to 70g of polyvinyl alcohol, AMPS\AM\AA (2-acrylamido-2-methylpropanesulfonic acid / acrylamide / sodium acrylate) polymer 10.0g, crosslinking agent 15g, dispersion 5g of each component was weighed. The preparation steps are as follows: Pour polyvinyl alcohol into a 200ml beaker, then add AMPS\AM\AA (2-acrylamido-2-methylpropanesulfonic acid / acrylamide / sodium acrylate) polymer, crosslinking agent, dispersion The agents were poured into the beaker in turn; then stirred for 20 minutes to mix well. The prepared mixture is a fluid loss reducer.

[0029] Secondly, according to: G grade oil well cement 400g, seawater 340g, retarder 2g, defoamer 1.5g, fluid loss reducer 9g, dispersant 8g, lightening material 100g, ultrafine cement 60g, ultrafine slag 46g weigh each Components, all the other embodiments are the same as in Example 1.

[0030] The test results of the cementing low-temperature hig...

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

PropertyMeasurementUnit
densityaaaaaaaaaa
strengthaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a high intensity low free water low density cement paste. The compositions by weight percentage of the cement paste are: 29 to 36 percent of Bohai seawater, 61.7 to 68.6 percent of solid low density cement material, and 2.3 to 2.4 percent of fluid additive. Compared with the conventional low temperature low density cement paste, the well cementation low temperature high intensity low free water low density well cementation cement paste has low free water, high intensity, easily controlled thickening time, and simpler operation routine. The density of the cement paste is between 1.48 and 1.52g / cm<3>; the intensity (24h, constant pressure and 50 DEG C) is more than or equal to 15MPa; the mobility is more than or equal to 24 centimeters; the free water is smaller than or equal to 1 ml; the suitable temperature is between 27 and 60 DEG C; and the thickening time is adjusted between 100 and 400 minutes.

Description

technical field [0001] The invention relates to a high-strength, low-free-water, and low-density cement slurry for well cementing directly configured with seawater. Background technique [0002] At present, the conventional low-density cement slurry system in the Bohai Sea area is mainly designed for the following problems encountered in the cementing process: [0003] 1. Low temperature and slow cement hydration; [0004] 2. The formation fracture pressure is low, and the cement slurry is easy to leak; [0005] 3. The existence of shallow flow is prone to pressure runaway; [0006] 4. The existence of gas hydrate may cause the release of hydrate during the cementing operation. [0007] The successful development of conventional low-temperature and low-density cement slurry satisfies the need for well cementing in the Bohai Sea area, but there are still some defects in the application process of the cement slurry, such as high free water and low strength. Contents of 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
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00
CPCC04B2201/50C04B2201/20C09K8/473C04B28/026C09K8/487Y02W30/91C04B7/00C04B18/027C04B18/141C04B20/0092C04B22/0026C04B2103/46C04B20/002C04B24/2623C04B24/2641C04B24/2652C04B2103/408
Inventor 王云庆蔡久能韩冰袁梅陈俊生
Owner COSL CHEM TIANJIN
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com