Multi-functional nanometer oil well cement slurry

A technology of oil well cement slurry and oil well cement, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problem of large specific surface area of ​​nanoparticles, chemical adsorption activity, insufficient use of the advantages of nanomaterials, and cement slurry system Poor flow performance and other problems, to reduce formation water dissolution, ensure the security of national energy strategy, and improve the effect of cementing quality

Inactive Publication Date: 2010-08-04
DAQING PETROLEUM ADMINISTRATION +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, nanoparticles have a large specific surface area and strong chemical adsorption activity. It is difficult...

Method used

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  • Multi-functional nanometer oil well cement slurry
  • Multi-functional nanometer oil well cement slurry
  • Multi-functional nanometer oil well cement slurry

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Embodiment Construction

[0012] The present invention will be further described in the following embodiments:

[0013] Taking G-grade oil well cement as an example, a DNF nano cement slurry system was prepared, and various properties of the system were studied.

[0014] Through surface modification and chemical grafting, the invention improves the defects of traditional nano materials that are easy to agglomerate and are difficult to disperse, improves the mixing properties of nano particles, and ensures the fluidity of the nano cement slurry system. See Table 1 below.

[0015] Rheological properties of cement slurry system Table 1

[0016]

category

Liquidity

cm

Φ

300

Φ

100

Φ

3

n

K

Pa·S n

τ s

Pa

Q c

l / s

P f

MPa

G grade puree

24

99

71

18

0.39

3.73

9.20

98.50

0.88

DNF cement slurry

26.5

67

47

30

0.71

0.23

15.33

27.58

0.42

[0017] Q in the table C (Critical displacement) is calculated based on the well diameter of 220mm and casing outer diam...

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Abstract

The invention discloses multi-functional nanometer oil well cement slurry. The cement slurry comprises the following components in parts by weight: 2.5-3 parts of modified nanometer ferric oxide, 5-5.5 parts of modified nanometer silica, 2-2.5 parts of modified nanometer magnesium oxide, 0.2-0.5 part of dispersant Sxy and 100 parts of G-grade oil well cement, wherein the water-cement (W/C) ratio is 0.46. By using the oil well cement slurry of the invention, the blending property of nanoparticles can be increased; the flowing property of the nanometer cement slurry system can be increased; the compactness of cement can be improved, the hydrated product is optimized, and the bonding property of cement sheath interface is improved, thus increasing the cementing quality of oil and gas wells and prolonging the service life thereof.

Description

Technical field: [0001] The invention relates to a cement slurry in the field of oil field drilling, in particular to a multifunctional nano oil well cement slurry. Background technique: [0002] In the process of petroleum exploration and development, oil well cement is an indispensable cementing material for cementing projects. Its performance is directly related to the quality of oil and gas well cementing and the level of oil and gas recovery. With the continuous deepening of oilfield exploration and development in old areas and long-term water injection, the geological conditions of the reservoir have changed significantly, the formation pressure is unevenly distributed, the comprehensive water content is high, and the cement is in the disturbance of the formation fluid. After the formation fluid comes into contact with the cement stone, the Ca(OH) in the cement stone is removed by "leaching" 2 Dissolution takes away; at the same time, SO rich in fluid 4 2- , HCO 3 - , Cl - ...

Claims

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Application Information

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IPC IPC(8): C09K8/46C04B22/06
Inventor 徐明吕斌侯力伟杨决算吴广兴和传健姚萍
Owner DAQING PETROLEUM ADMINISTRATION
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