High-temperature powder retarder in oil well cement

Abstract

The invention relates to a high-temperature powder retarder in oil well cement. Ethylenediamine is used to prepare methylene phosphonate through Mannick reaction and is mixed with 0.10-0.30 weight parts of citric acid, 0.05-0.10 weight parts of tartaric acid and 0.10-0.20 weight parts of gluconic acid. The applicable temperature of the retarder is 60-130DEG C, the retarder can be used for cement paste systems with densities of all kinds, the compatibility with various additive systems is strong, the performance of cement paste is not influenced, a cement paste body prepared by using the retarder is stable, the thickening transition time is short and the thickening time is adjustable; and the compression strength of set cement is developed fast and the high-temperature powder retarder can meet the need of medium-deep well cementation engineering.

Description

technical field

[0001] The invention relates to a cement admixture used in the cementing field of oilfield well completion technology, which belongs to a medium-high temperature retarder. Background technique

[0002] In oil and gas well cementing operations and other underground cementing operations, it is usually required to inject cement slurry containing cement, water and admixtures into the predetermined formation underground through surface pumping equipment to seal the annulus between the formation and the casing. . Typically cement slurry is pumped into the casing and returns to the annulus through the gap between the casing and the formation. The cement slurry solidifies in the annular space to form a hard cement sheath column, which can form a bond with the formation and the casing. In order to achieve a satisfactory cementing operation, it is necessary to achieve a high-strength bond to prevent fluid channeling along or within the cement sheath, which would cont...

Examples

Embodiment 1

[0029] Weigh 1 part by weight of methylene phosphate, 0.10 part of citric acid, 0.05 part of tartaric acid and 0.20 part of gluconic acid, and then mix them uniformly in a mortar to make a medium-high temperature powder retarder, use R01 as code name.

[0030] Mix the cement slurry performance of this retarder under the different test conditions of table 1

[0031]

Embodiment 2

[0033] Weigh 1 part by weight of subunit phosphate, 0.20 part of citric acid, 0.10 part of tartaric acid and 0.10 part of gluconic acid, and then mix them evenly in a mortar to make a medium-high temperature powder retarder, and use R02 as the code name .

[0034] Mix the cement slurry performance of this retarder under the different test conditions of table 2

[0035]

[0036]

Embodiment 3

[0038] Weigh 1 part of subunit phosphate, 0.20 part of citric acid, 0.05 part of tartaric acid and 0.15 part of glucose, and then mix them uniformly in a mortar to make a medium-high temperature powder retarder, and use R03 as the code name.

[0039] Mix the cement slurry performance of this retarder under the different test conditions of table 2

[0040]

technical field

[0001] The invention relates to a cement admixture used in the cementing field of oilfield well completion technology, which belongs to a medium-high temperature retarder. Background technique

[0002] In oil and gas well cementing operations and other underground cementing operations, it is usually required to inject cement slurry containing cement, water and admixtures into the predetermined formation underground through surface pumping equipment to seal the annulus between the formation and the casing. . Typically cement slurry is pumped into the casing and returns to the annulus through the gap between the casing and the formation. The cement slurry solidifies in the annular space to form a hard cement sheath column, which can form a bond with the formation and the casing. In order to achieve a satisfactory cementing operation, it is necessary to achieve a high-strength bond to prevent fluid channeling along or within the cement sheath, which would cont...

Examples

Embodiment 1

[0029] Weigh 1 part by weight of methylene phosphate, 0.10 part of citric acid, 0.05 part of tartaric acid and 0.20 part of gluconic acid, and then mix them uniformly in a mortar to make a medium-high temperature powder retarder, use R01 as code name.

[0030] Mix the cement slurry performance of this retarder under the different test conditions of table 1

[0031]

Embodiment 2

[0033] Weigh 1 part by weight of subunit phosphate, 0.20 part of citric acid, 0.10 part of tartaric acid and 0.10 part of gluconic acid, and then mix them evenly in a mortar to make a medium-high temperature powder retarder, and use R02 as the code name .

[0034] Mix the cement slurry performance of this retarder under the different test conditions of table 2

[0035]

[0036]

Embodiment 3

[0038] Weigh 1 part of subunit phosphate, 0.20 part of citric acid, 0.05 part of tartaric acid and 0.15 part of glucose, and then mix them uniformly in a mortar to make a medium-high temperature powder retarder, and use R03 as the code name.

[0039] Mix the cement slurry performance of this retarder under the different test conditions of table 2

[0040]

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