Chloride-free coagulating early strength agent for oil well cement and preparation method and application of agent

An oil well cement, coagulation-promoting and early-strength technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of cement stone strength decline, etc., and achieve the effect of easy control and simple operation

Active Publication Date: 2019-06-28
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 slurry when cementing wells, and quick-setting cement slurry needs to be added to low-temperature cementing. However, due to the chloride ion contained in the quick-setting agent, the strength of the cement stone will decline during high-temperature mining.

Method used

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  • Chloride-free coagulating early strength agent for oil well cement and preparation method and application of agent
  • Chloride-free coagulating early strength agent for oil well cement and preparation method and application of agent
  • Chloride-free coagulating early strength agent for oil well cement and preparation method and application of agent

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The present invention provides a preparation method of the chlorine-free coagulation accelerator accelerator for oil well cement described in the above technical scheme, comprising the following steps:

[0027] Anhydrous aluminum sulfate, sodium sulfate, ethylene glycol and triisopropanolamine are dissolved in water to obtain a chlorine-free coagulation accelerator for oil well cement.

[0028] The present invention preferably dissolves under stirring conditions, and the stirring speed is preferably 100 to 200r / min, more preferably 150r / min; the present invention preferably mixes anhydrous aluminum sulfate, sodium sulfate, ethylene glycol and triisopropanol The amines are sequentially added into water for dissolution, each substance is completely dissolved and stirred evenly, and then the next substance is added; in a specific embodiment of the present invention, each substance is preferably stirred for 0.5-1 hour before adding the next substance.

[0029] In the presen...

Embodiment 1

[0035] The composition of the chlorine-free coagulation accelerator for oil well cement is: 75g of water, 6g of anhydrous aluminum sulfate, 5g of sodium sulfate, 6g of ethylene glycol, and 2g of triisopropanolamine;

[0036] Anhydrous aluminum sulfate, sodium sulfate, ethylene glycol and triisopropanolamine are dissolved in water in sequence and mixed evenly to obtain the chlorine-free coagulation accelerator accelerator for oil well cement.

[0037] performance testing

[0038] The performance tests of the chlorine-free coagulation accelerator accelerator for oil well cement obtained in Example 1 were carried out under low temperature conditions and high temperature conditions respectively.

[0039] (1) Low temperature (45°C) performance test:

[0040] The high temperature resistant cement slurry system consists of G grade cement, water, external admixture (quartz sand), fluid loss reducer (commercially available) and dispersant (commercially available), of which G grade cem...

Embodiment 2

[0059] The composition of the chlorine-free coagulation accelerator for oil well cement is: 80g of water, 7g of anhydrous aluminum sulfate, 7g of sodium sulfate, 8g of ethylene glycol, and 5g of triisopropanolamine;

[0060] Anhydrous aluminum sulfate, sodium sulfate, ethylene glycol and triisopropanolamine are dissolved in water in sequence and mixed evenly to obtain the chlorine-free coagulation accelerator accelerator for oil well cement.

[0061] According to the method in Example 1, the obtained oil well cement chlorine-free coagulation accelerator accelerator is tested for performance under low temperature conditions, and the obtained results are shown in Table 3;

[0062] Table 3 Example 2 Effect of chlorine-free coagulation accelerator accelerator on high temperature resistant cement slurry system for oil well cement

[0063]

[0064] According to the method in Example 1, the obtained oil well cement chlorine-free coagulation accelerator accelerator was tested for h...

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Abstract

The invention relates to the technical field of additives for oil well cement and provides a chloride-free coagulating early strength agent for oil well cement and a preparation method and applicationof the agent. The coagulating early strength agent for the oil well cement is prepared from, by mass, 70-80 parts of water, 5-10 parts of anhydrous aluminium sulfate, 5-8 parts of sodium sulfate, 5-10 parts of ethylene glycol and 2-5 parts of triisopropanolamine. The chloride-free coagulating early strength agent for the oil well cement does not contain chlorine ions and is suitable for high-temperature-resistant cement paste, in the well cementation construction process, the thickening time of the high-temperature-resistant cement paste can be shortened at low temperature, the early strengthof high-temperature-resistant set cement is improved, and strength attenuation of the high-temperature-resistant set cement at high temperature can be effectively prevented.

Description

technical field [0001] The invention relates to the technical field of oil well cement admixtures, in particular to a chlorine-free coagulation accelerator for oil well cement and its preparation method and application. 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% to 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 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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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
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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