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

Low-density cement paste for well cementation operation, and cement composition for well cementation operation

A low-density, cement slurry technology, applied in the field of oil well drilling engineering, can solve problems such as high density and inability to meet leakage prevention requirements

Inactive Publication Date: 2020-04-17
CHINA PETROCHEMICAL CORP +2
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention also provides a cement composition for well cementing operations to solve the problem that the cement slurry system prepared from the existing cement composition and water cannot meet the leakage prevention requirements due to its high density

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
  • Low-density cement paste for well cementation operation, and cement composition for well cementation operation
  • Low-density cement paste for well cementation operation, and cement composition for well cementation operation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0026] The low-density cement slurry (formula B) for well cementing of this embodiment is composed of 170.5 parts by weight of water, cement composition for well cementing, fluid loss reducer, early strength agent and drag reducer, and cement for well cementing The composition is composed of the following components in parts by weight: 100 parts of G-grade oil well cement, 40 parts of lightening materials, and 15 parts of microsilicon; wherein the lightening materials include power plant floating beads and glass microspheres, and the weight of power plant floating beads and glass microspheres The ratio is 7:1; the dosages of fluid loss reducer, early strength agent and drag reducer are respectively 2%, 2.5% and 0.2% of the cement composition for well cementing operations. The particle size of power plant floating beads is 31.724~287.748μm, and the density is 0.7~0.9g / cm 3 , the particle size of the glass beads is 15-125 μm. The density of the low-density cement slurry of this...

experiment example 1

[0033] The low-density cement slurry formulations A, B, and C were used for cementing operations to perform compressive strength tests, and the test results are shown in Table 1 below:

[0034] Table 1 Compressive strength test

[0035]

[0036] Through the experiment of the compressive strength of cement stone in Table 1, it can be seen that the density of the low-density cement slurry for cementing operation of the present invention is as low as 1.15-1.25g / cm 3 , At the same time, the compressive strength of 24h, 36h, and 48h is strong, so that the strength of cement stone is increased while the density is reduced, which can not only solve the problem of leakage, but also ensure the quality of cementing.

experiment example 2

[0038] Floating beads are thin-walled bead-shaped particles screened from fly ash floats, which have the characteristics of light weight, heat insulation, acid and alkali resistance, non-toxic, non-combustible and odorless. When using floating beads to prepare cement slurry, the floating beads only need a small amount of water to wet the surface to make the cement slurry have a certain fluidity, thereby reducing the amount of slurry water added. At present, the floating beads commonly used in oil fields are divided into artificial floating beads and power plant floating beads. The pressure bearing capacity of power plant floating beads is higher than that of artificial floating beads.

[0039] In order to compare the pressure bearing capacity of artificial floating beads and power plant floating beads, artificial floating beads and power plant floating beads were used as lightening materials to make a density of 1.15g / cm 3 For cement slurry (formula C), put the slurry in a 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
Particle sizeaaaaaaaaaa
Densityaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to low-density cement paste for well cementation operation, and a cement composition for well cementation operation, and belongs to the technical field of oil well drilling engineering. The low-density cement paste for well cementation operation comprises water and the following components in parts by weight: 70-100 parts of oil well cement, 0-30 parts of superfine cement, 35-80 parts of a lightening material and 15-20 parts of micro-silicon, wherein the lightening material comprises at least one of floating beads and glass micro-beads. According to the invention, the cement paste is good in performance of each component material and moderate in addition proportion, the density of the cement paste prepared from various components can reach 1.15-1.25 g / cm<3>, and the cement paste is high in stability, good in fluidity and high in strength, so that the risk of well cementation leakage can be reduced, and the well cementation quality and the displacement efficiency are improved.

Description

technical field [0001] The invention relates to a low-density cement slurry for well cementing operations and a cement composition for well cementing operations, belonging to the technical field of oil well drilling engineering. Background technique [0002] At present, the development of major domestic oil fields has entered the late stage, and all major oil fields have been transferred to the development of complex low-pressure reservoirs. However, with the continuous expansion of the application of underbalanced drilling technology, serious leakage often occurs during drilling and cementing. Domestic institutions have formulated low-density cement slurry through the compound use of various lightening materials and the addition of admixtures, and have successfully applied it to many oil fields. Lightening materials mainly include bentonite, volcanic ash, fly ash, floating beads, etc. At present, the most widely used lightening material in oil fields is floating beads, but ...

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): C09K8/467C04B28/02C04B111/40
CPCC04B28/02C04B2111/00724C04B2111/40C04B2201/20C09K8/467C04B18/08C04B18/146C04B2103/0068C04B2103/10C04B14/22
Inventor 杨伟周东魏钊杨文波常云超杨丽
Owner CHINA PETROCHEMICAL CORP
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