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Cement setting accelerator, preparation method and application thereof, and set cement

A technology of quick-setting agent and cement stone, which is applied to cement stone. , In the field of cement quick-setting agent and its preparation, it can solve the problems of low strength and difficulty in high-temperature mining of heavy oil, and achieve the effects of high early strength, preventing the formation of micro-cracks, and no decline in strength

Active Publication Date: 2019-07-09
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thermal recovery wells have the characteristics of low-temperature cementing (22-45°C) and high-temperature mining (higher than 270°C). High-temperature mining must use high-temperature-resistant cement when cementing wells, and accelerators need to be added to the cement slurry for low-temperature well cementing. , but the early strength of the cement in the prior art is low after thickening, which brings certain difficulties to the high-temperature exploitation of heavy oil. research focus

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  • Cement setting accelerator, preparation method and application thereof, and set cement
  • Cement setting accelerator, preparation method and application thereof, and set cement
  • Cement setting accelerator, preparation method and application thereof, and set cement

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preparation example Construction

[0032] The present invention also provides the preparation method of the above-mentioned cement quick-setting agent, comprising the following steps: mixing polyaluminum chloride, calcium chloride, sodium oxalate, calcium aluminate, calcium formate, sodium sulfate, dispersant and nano-silicon in sequence , to obtain cement quick-setting agent.

[0033] In the present invention, the mixing time is preferably 0.5-2 hours.

[0034] The present invention also provides the application of the above-mentioned cement quick-setting agent in cement stone.

[0035] The present invention also provides a cement stone, which comprises the above-mentioned cement quick-setting agent, water and cement. In the present invention, the added amount of the cement quick-setting agent is preferably 0.5-2% of the cement mass.

[0036] In the present invention, there is no special limitation on the source of the cement, and commercially available products well known to those skilled in the art can be ...

Embodiment 1

[0039] A cement quick-setting agent, comprising the following components in mass percent: 2% polyaluminium chloride; 25% calcium chloride; 20% sodium oxalate; 5% calcium aluminate; 10% calcium formate; 15% sodium sulfate; Agent 5%; nano-silicon 15%;

[0040] The above-mentioned cement quick-setting agent, 800G grade cement and water are mixed, and the cement quick-setting agent is 2% of the mass of the 800G grade cement to obtain cement stone.

[0041] figure 1 For the cement stone that embodiment 1 makes under certain temperature and pressure, the curve graph of grout consistency changing with time, from figure 1 It can be seen that the cement slurry can thicken in a short time (2h).

Embodiment 2

[0043] A cement quick-setting agent, comprising the following components in mass percent: 8% polyaluminum chloride; 23% calcium chloride; 18% sodium oxalate; 8% calcium aluminate; 8% calcium formate; 13% sodium sulfate; Agent 9%; nano-silicon 13%. ;

[0044] Mix the above-mentioned cement quick-setting agent, 800G grade cement and water, and arrange them according to different proportions to obtain cement stone.

[0045] Table 1 Different content of cement quick-setting agent, at different temperatures for 1.90g / cm 3 Experimental data on the influence of density cement slurry thickening time (min)

[0046]

[0047]

[0048]From the experimental data in Table 1, it can be obtained that the cement slurry prepared in this example, within the range of 32-52 °C, the thickening time shortens continuously with the increase of temperature and addition amount. When the addition amount is 2%, the cement The thickening time of the slurry is 56-137 minutes.

[0049] figure 2 T...

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Abstract

The invention provides a cement setting accelerator, and a preparation method and application thereof, and belongs to the field of well cementation in thickened oil exploitation. The cement setting accelerator provided by the invention comprises the following components in percentage by mass: 5-10% of polyaluminium chloride, 20-25% of calcium chloride, 15-20% of sodium oxalate, 5-10% of calcium aluminate, 5-10% of calcium formate, 10-15% of sodium sulfate, 5-10% of a dispersing agent and 10-15% of nano silicon. The cement accelerator provided by the invention is prepared by adopting specific components and content, so that setting is fast at low temperature, early strength is high, and the early strength is not reduced at high temperature. The result of the embodiment shows that when the adding amount of the cement accelerator provided by the invention is 2%, the thickening time of cement paste is 56-137 minutes in a temperature range of 32-52 DEG C; the early strength of set cement after 8 hours is 8.1 MPa at a temperature of 36 DEG C; and the early strength after 24 hours is 26.9 MPa.

Description

technical field [0001] The invention relates to the field of well cementing in heavy oil production, in particular to a cement quick-setting agent, a preparation method and application thereof, and a cement stone. Background technique [0002] About half of the world's proven oil reserves are heavy oil, and countries such as Canada, the United States, and Venezuela have all carried out thermal recovery of heavy oil. Our country is also rich in heavy oil resources, and since the 1970s, we have been committed to the research and practice of heavy oil recovery technology. A large number of heavy oil reservoirs have been discovered in Liaohe, Shengli, Tuha, Karamay and other oilfields, and the production is close to 10-15% of the production capacity of each oilfield. The rational development of these oilfields is of great significance to the stable and increased production of the above-mentioned oilfields. [0003] Liaohe Oilfield is rich in heavy oil, and the current annual ou...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B24/06C04B103/12
CPCC04B40/0039C04B28/00C04B2103/12C04B22/12C04B22/124C04B24/06C04B22/08C04B24/04C04B22/147C04B2103/408C04B22/02
Inventor 魏继军李连江孙宝玉吕海丹马志贺张璞乔张莉刘奇张阔
Owner BC P INC CHINA NAT PETROLEUM CORP
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