Early strength agent, preparation method thereof and cement paste for well cementation

A technology of early strength agent, alkali metal chloride, applied in chemical instruments and methods, drilling composition and other directions, can solve problems such as poor effect, achieve the effect of improving diffusion rate, promoting coagulation and hardening, and increasing ionic strength

Active Publication Date: 2019-10-11
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The strength accelerator provided in the related art can accelerate the hardening of the cement slurry at 10°C, but the effect of promoting the hardening of the cement slurry at 4°C is poor

Method used

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  • Early strength agent, preparation method thereof and cement paste for well cementation
  • Early strength agent, preparation method thereof and cement paste for well cementation
  • Early strength agent, preparation method thereof and cement paste for well cementation

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preparation example Construction

[0061] In the second aspect, the embodiment of the present invention also provides a preparation method of any of the aforementioned early strength agents, and the preparation method includes:

[0062] According to the weight of each component, add alkali metal chloride and / or alkaline earth metal chloride, calcium nitrate, sodium nitrite, and carboxylic alcohol amine ester into water, stir to obtain an early strength agent;

[0063] The mass percentage of the mixture of alkali metal chloride and / or alkaline earth metal chloride, calcium nitrate, sodium nitrite, and carboxylic alcohol amine ester in the water is 30% to 60%.

[0064] The above preparation method is simple and can be prepared and used on site.

[0065] In the above method, the specific time of stirring is not limited, and the alkali metal chloride and / or alkaline earth metal chloride, calcium nitrate, sodium nitrite, and carboxylic alcohol amine ester can be uniformly dissolved in water.

[0066] As an example, the stirri...

Embodiment 1

[0077] This embodiment provides an early-strength agent, which is prepared by the following method: 5g potassium chloride, 20g calcium nitrate, 20g sodium nitrite, 5g carboxylic alcohol amine ester are added to 50g water and stirred to obtain The early strength agent provided in this embodiment.

[0078] Among them, the carboxylic alcohol amine ester is obtained by adding 7.5 g of triisopropanolamine and 9.8 g of maleic anhydride into a three-necked flask, and stirring and polymerizing at 80°C.

Embodiment 2

[0080] This embodiment provides an early strength agent, which is prepared by the following method: 10g calcium chloride, 15g calcium nitrate, 25g sodium nitrite, 7g carboxylic alcohol amine ester are added to 85g water and stirred to obtain The early strength agent provided in this embodiment.

[0081] Among them, the carboxylic acid alcohol amine ester is obtained by adding 7.5 g of triisopropanolamine and 11.6 g of maleic acid into a three-necked flask, and stirring and polymerizing at 85°C.

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Abstract

The invention discloses an early strength agent, a preparation method thereof and cement paste for well cementation, belonging to the field of oilfield chemistry. The early strength agent comprises the following various ingredients in parts by weight: 5-10 parts of alkali chloride and/or alkaline-earth metal chloride, 15-25 parts of calcium nitrate, 15-25 parts of sodium nitrite, 5-10 parts of carboxylic acid alkylol amine ester and water; and the mass percent of the mixture of the alkali chloride and/or alkaline-earth metal chloride, the calcium nitrate, the sodium nitrite and the carboxylicacid alkylol amine ester in the water is 30-60%. The early strength agent can promote the cement paste for the well cementation to condense and harden in a low-temperature environment of 4 DEG C to cause the cement paste for the well cementation to have relatively high early strength.

Description

Technical field [0001] The invention relates to the field of oil field chemistry, in particular to an early strength agent, a preparation method thereof, and cement slurry for oil well cementing. Background technique [0002] The oil and gas reserves in deep water areas such as the seabed account for a large proportion of the total oil and gas reserves. Taking the exploitation of seabed oil and gas as an example, before the exploitation of seabed oil and gas, it is necessary to cement the seabed oil well. However, due to the low temperature (approximately 4°C) in the deep water area, the seabed stratum is soft, easy to fracture, and easy to move, and it is not easy to harden the cement slurry for cementing, which affects the construction of cementing operations. By adding an early-strength agent to the cement slurry, the hardening of the cement slurry can be accelerated, and its early strength can be improved, which is beneficial to the cementing operation of subsea oil wells. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC09K8/467
Inventor 席方柱曾建国李鹏晓孙富全王友华宋本岭黄志刚夏元博熊钰丹王建瑶
Owner BC P INC CHINA NAT PETROLEUM CORP
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