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Oil well cement slow coagulation agent

A cement retarder, a selected technology, applied in the field of cement retarder, can solve the problems of not being suitable for high salinity water quality, affecting the development of cement stone strength, and the retarder can only be applied, so as to improve the replacement efficiency, Good shape of thickening curve and effect of improving rheological properties

Inactive Publication Date: 2005-10-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The cement retarders commonly used now mainly include: polyhydroxy organic acids, sugars and derivatives thereof, sodium gluconate or calcium gluconate, lignin, tartaric acid, etc., but these retarders all have certain defects, such as : ① Some retarders can only be used in the medium and low temperature (≤90°C) temperature range; ② Some retarders can only be used in a higher temperature range, so there are certain limitations in the use of temperature range; Although high-temperature retarders can be used at high and low temperatures, they have defects such as easy foaming and too sensitive addition; ④ Some retarders also affect the strength development of cement stone; ⑤ General retarders have poor resistance and are not Suitable for high salinity water quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the reaction flask, 62 g of sodium potassium gluconate, 28 g of hydroxyethylidene diphosphonic acid (HEDP) and 12 g of citric acid were reacted together. Using 200ml of water as an intermediate solvent, first activate sodium potassium gluconate in water at a temperature of 65±3°C for about 30 minutes, then gradually add HEDP, and react at a constant temperature of 75±2°C for two hours to obtain an intermediate product with a certain concentration. Then add citric acid at about 60±3°C, stir at constant temperature for one hour, and filter to get the finished retarder.

Embodiment 2

[0028] In the reaction flask, 68 g of sodium gluconate, 23 g of 2-methylenephosphonic acid butanetricarboxylic acid and 14 g of citric acid were reacted together. Using 210ml of water as an intermediate solvent, first activate sodium gluconate in water at a temperature of 65±3°C for about 30 minutes, then gradually add 2-methylenephosphonic acid butanetricarboxylic acid, and react at a constant temperature of 78±2°C for two hours Finally, the intermediate product with a certain concentration can be obtained, and then citric acid is added at about 60±3°C, stirred at a constant temperature for one hour, and the finished retarder can be obtained after filtering.

Embodiment 3

[0030] make up

[0031] It can be seen from the above table that the added amount of retarder is small, the applicable temperature range is very wide, and the added amount is not sensitive, which is easy to ensure the safety of construction. At the same time, the retarder has no adverse effect on the strength of cement stone. In addition, when the mixing water of formulas 11 and 12 is semi-saturated brine, the retarder has no side effects such as super-retarding and foaming.

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PUM

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Abstract

A setting retarder of cement for oil well is prepared from glucosaccharate, organic phosphonic acid or its salt, and organic acid through reaction. Its advantages are high effect, wide temp range and high compatibility to other additives.

Description

technical field [0001] The invention relates to a cement retarder, in particular to a cement retarder used in oil drilling, well completion or well cementing operations. technical background [0002] The cement retarder of the present invention is a cement admixture, and is usually used in the cement slurry used in the cementing operation of oil and gas wells. As we all know, in the cementing operation of oil and gas wells, the cement slurry is pumped into the well by pumping, and the cement slurry is replaced into the annular space between the casing and the wellbore through the slurry replacement, so as to isolate the oil, gas, and water layers to protect production layer and support the purpose of the protective casing. The cement should have good pumpability until it is delivered to the desired location. As the hydration reaction in cement proceeds, when the cohesion reaches a certain level, the cement will lose its fluidity and cannot be used for construction. Theref...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/00C04B24/04C04B24/06C04B24/10C04B28/26C09K8/42
CPCC04B2103/22C09K8/42C04B24/003C04B28/26
Inventor 桑来玉王其春赵艳丁士东周仕明
Owner CHINA PETROLEUM & CHEM CORP
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