Low-density oil-well cement

An oil well cement, low-density technology, applied in the field of building materials, can solve the problems of occupying land and polluting the environment, and achieve the effects of low density, good fluidity, and stable high temperature performance

Inactive Publication Date: 2018-05-22
毕言铎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accumulation of a large number of waste glass not only occupies land, but also pollutes the environment

Method used

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  • Low-density oil-well cement

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A low-density oil well cement composed of the following parts by weight: 40 parts G-grade oil well cement, 5 parts phosphogypsum, 10 parts waste glass powder, 40 parts fly ash, 0.5 parts plastic expansion agent, 1 part stabilizer Parts, 0.5 parts of retarder, 0.03 parts of enhancer, 1 part of dispersant, 2 parts of aluminum dihydrogen phosphate.

[0021] The waste glass powder is crushed and ground from waste glass to a specific surface area ≥ 400m 2 / kg obtained.

[0022] The plastic expansion agent is calcium peroxide.

[0023] The stabilizer is composed of magnesium aluminum silicate and propylene glycol alginate.

[0024] The retarder is composed of polyol phosphate and sucrose.

[0025] The enhancer is composed of triethanolamine and sodium nitrophenolate in a weight ratio of 2:1.

[0026] The dispersant is composed of polycarboxylic acid water reducing agent and dioctyl succinate sulfonic acid in a weight ratio of 8:1.

Embodiment 2

[0028] A low-density oil well cement composed of the following parts by weight: 60 parts G-grade oil well cement, 2 parts phosphogypsum, 20 parts waste glass powder, 30 parts fly ash, 3 parts plastic expansion agent, 0.05 parts stabilizer Parts, 1 part retarder, 0.01 parts enhancer, 3 parts dispersant, 0.5 parts aluminum dihydrogen phosphate.

[0029] The waste glass powder is made of SiO 2 Waste glass with a content of ≥60% is crushed and ground to a specific surface area of ​​≥400 m 2 / kg obtained.

[0030] The bulk density of the fly ash≤750kg / m 3 .

[0031] The plastic expansion agent is ammonium chloride.

[0032] The stabilizer is composed of magnesium aluminum silicate and propylene glycol alginate in a weight ratio of 3:1.

[0033] The retarder is composed of polyol phosphate and sucrose in a weight ratio of 1:1.

[0034] The enhancer is composed of triethanolamine and sodium nitrophenolate in a weight ratio of 5:1.

[0035] The dispersant is composed of polycarboxylic acid water...

Embodiment 3

[0037] A low-density oil well cement composed of the following parts by weight: 50 parts G grade oil well cement, 4 parts phosphogypsum, 15 parts waste glass powder, 35 parts fly ash, 2 parts plastic expansion agent, 0.5 parts stabilizer Parts, 0.8 parts of retarder, 0.02 parts of enhancer, 2 parts of dispersant, 1.2 parts of aluminum dihydrogen phosphate.

[0038] SiO in the waste glass powder 2 The content is ≥60%.

[0039] The plastic expansion agent is azodicarbonamide.

[0040] The stabilizer is composed of magnesium aluminum silicate and propylene glycol alginate.

[0041] The retarder consists of total phosphorus (in PO 4 3- Count) Polyol phosphate and sucrose with content ≥30%.

[0042] The enhancer is composed of triethanolamine and sodium nitrophenolate in a weight ratio of 3:1.

[0043] The dispersant is composed of polycarboxylic acid water reducing agent and dioctyl succinate sulfonic acid in a weight ratio of 6:1.

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Abstract

The invention belongs to the technical field of construction materials and discloses high temperature resistant low-density oil-well cement. The low-density oil-well cement is prepared from the following substances in parts by weight: 40 to 60 parts of G-grade oil-well cement, 2 to 5 parts of phosphorus gypsum, 10 to 20 parts of waste glass powder, 30 to 40 parts of fly ash, 0.5 to 3 parts of a plastic expanding agent, 0.05 to 1 part of a stabilizer, 0.5 to 1 part of a retarder, 0.01 to 0.03 part of an enhancing agent, 1 to 3 parts of a dispersant and 0.5 to 2 parts of aluminum dihydrogen phosphate. The low-density oil-well cement disclosed by the invention has the advantages of small density, good flowability, stable high-temperature performance and the like, and is very suitable for requirements of cementing engineering of deep wells and long shut-in wells.

Description

Technical field [0001] The invention belongs to the technical field of building materials, and specifically relates to a low-density oil well cement. Background technique [0002] With the rapid development of the petroleum industry, the demand for oil well cement for oil and gas cementing is also rising. Especially due to the improvement of drilling technology and the intensification of the degree of exploitation, the number of deep wells and long closed wells is increasing. The deepening and poor geological conditions put forward higher requirements on the performance of cementing slurry, and the demand for low-density oil well cement is even more urgent. Patent CN103725276A discloses a low-density fly ash cement slurry, which has high strength and can reduce cement stone shrinkage, but has high density and is not resistant to high temperatures. Patent CN101747009A discloses a high-temperature low-density cement, which has excellent properties such as low density and high temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C09K8/473C04B22/14C04B14/22C04B18/08
CPCC04B14/22C04B18/08C04B22/144C04B28/00C04B2201/20C04B2201/50C09K8/473C04B22/068C04B22/08C04B24/06C04B24/003C04B24/10C04B24/122C04B24/24C04B24/16C04B22/16C04B24/127C04B22/124C04B24/124Y02W30/91
Inventor 毕言铎
Owner 毕言铎
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