High-density cement slurry suitable for shale gas cementing and preparation method of high-density cement slurry

A high-density, cement slurry technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem that the mechanical properties of cement stone cannot meet the requirements, the sealing quality of the second interface is difficult to guarantee, and the casing in the horizontal section is centered To improve the flexural strength and impact resistance, reduce the modulus of elasticity, and improve the strength

Inactive Publication Date: 2015-11-11
成都欧美克石油科技股份有限公司
View PDF5 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, shale gas well cementing mainly faces three problems: 1. The mechanical properties of cement stone are difficult to meet the requirements. Shale gas wells generally need large-scale staged fracturing, which requires cement stone to have high strength, toughness and durability. ;2. It is difficult to guarantee the

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-density cement slurry suitable for shale gas cementing and preparation method of high-density cement slurry
  • High-density cement slurry suitable for shale gas cementing and preparation method of high-density cement slurry

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] [Example 1] A high-density cement slurry suitable for shale gas cementing, which is prepared from the following raw materials by weight: 100 parts of cement, 15 parts of weighting agent, 30 parts of high-temperature strength stabilizer, and 10 parts of filler Parts, 5 parts of plasticizer, 45 parts of fresh water, 7 parts of fluid loss agent, 1 part of retarder, 0.5 part of dispersant, 0.2 part of defoamer; the weighting agent is iron ore powder, and iron ore powder is 120 mesh; the weighting stabilizer is manganese ore powder, the particle size of the manganese ore powder is 300 mesh; the high temperature strength stabilizer is active silica fume, the particle size of the active silica fume is 80 mesh; the retarder is Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer; the dispersant is an aldehyde-ketone condensate or a naphthalene-based dispersant; the elastic plasticizer is mainly made of expanded rubber powder, short The fiber and mica flakes are made ...

Example Embodiment

[0022] [Example 2] A high-density cement slurry suitable for shale gas cementing, which is prepared from the following parts by weight of raw materials: 100 parts of cement, 15 parts of weighting agent, 10 parts of weighting stabilizer, and high temperature strength stabilizer 30 parts, 15 parts filler, 3 parts plasticizer, 44 parts fresh water, 6 parts fluid loss agent, 1 part retarder, 1 part dispersant, 0.2 part defoamer; the weighting agent is iron ore Powder, iron ore powder is 130 mesh; the weighting stabilizer is manganese ore powder, the particle size of manganese ore powder is 350 mesh; the high temperature strength stabilizer is active silicon powder, the particle size of active silicon powder is 100 mesh; The retarder is acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer; the dispersant is an aldehyde-ketone condensate or a naphthalene-based dispersant; the elastic plasticizer is an expanded rubber Powder is the main material, short fiber and mica flake...

Example Embodiment

[0026] [Example 3] A high-density cement slurry suitable for shale gas cementing, which is prepared from the following raw materials by weight: 100 parts of cement, 30 parts of weighting agent, 10 parts of weighting stabilizer, high temperature strength stabilizer 30 parts, 11 parts filler, 5 parts plasticizer, 44 parts fresh water, 6 parts fluid loss agent, 1.2 parts retarder, 1.5 parts dispersant, 0.3 parts defoamer; the weighting agent is iron ore Powder, iron ore powder is 150 mesh; the weighting stabilizer is manganese ore powder, the particle size of manganese ore powder is 400 mesh; the high temperature strength stabilizer is active silicon powder, the particle size of active silicon powder is 150 mesh; The retarder is acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer; the dispersant is an aldehyde-ketone condensate or a naphthalene-based dispersant; the elastic plasticizer is an expanded rubber Powder as the main material, short fibers and mica flakes are...

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 discloses high-density cement slurry suitable for shale gas cementing. The high-density cement slurry is prepared from the following raw materials in parts by weight: 100 parts of cement, 44-57 parts of fresh water, 15-120 parts of a weighting agent, 0-30 parts of a weighting stabilizer, 30-40 parts of a high-temperature strength stabilizer, 3-5 parts of an elasto-plastic agent, 4-7 parts of a fluid loss agent, 1-2.5 parts of a retarder and 0.5-2.5 parts of a dispersant. The preparation method comprises the following steps of weighing the cement, the fresh water, the weighting agent, the weighting stabilizer, the high-temperature strength stabilizer, filler, the elasto-plastic agent, the fluid loss agent, the retarder, the dispersant and a defoaming agent according to the ratio; mixing the components, and stirring to obtain the high-density cement slurry suitable for shale gas cementing. The high-density cement slurry is easily pulped at normal temperature and is good in high-temperature sedimentation stability, capable of improving the breaking strength, shock resistance and toughness of hardened cement slurry, relatively wide in density adjustable range and capable of meeting various shale gas cementing requirements.

Description

technical field [0001] The invention relates to a high-density cement slurry suitable for shale gas well cementing and a preparation method thereof, belonging to the field of petrochemical industry. Background technique [0002] Shale gas is natural gas that mainly exists in the interlayers of mudstone, high-carbon mudstone, shale, and silty rocks in an adsorbed or free state. Unlike conventional gas reservoirs, shale is not only the source rock for natural gas generation, but also Reservoirs and cap rocks that accumulate and preserve natural gas. The total porosity is generally less than 10%, and the effective porosity containing gas is generally less than half of the total porosity. Shale reservoirs are characterized by low porosity, ultra-low permeability and tight physical properties, and are relatively difficult to exploit. It is often necessary to adopt large-scale staged fracturing, so that the standard requirements for cement stone are more stringent. [0003] At ...

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): C09K8/487C09K8/48C04B28/02
CPCC09K8/487C04B28/02C04B2103/22C04B2103/408C04B2103/50C04B2111/00724C09K8/48C04B18/12C04B14/38C04B14/208C04B22/00C04B22/06C04B24/16C04B24/008C04B24/24C04B24/2652C04B24/32
Inventor 祝成唐昌强李勇
Owner 成都欧美克石油科技股份有限公司
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