Intermediate temperature retarder in oil well cement

Abstract

The invention relates to an intermediate temperature retarder in oil well cement, prepared from the following components in parts by weight: 1 part of water, 0.01-0.10 part of organic phosphoric acid and salts thereof, 0.01-0.10 part of hydroxy carboxylic acid and salts thereof, 0.02-0.05 part of boracic acid and 0.01-0.02 part of alkylene phosphoric acid and salts thereof. The intermediate temperature retarder has a suitable temperature range of 90-140 DEG C, can be applied to cement slurry systems of various densities and has strong compatibility with various admixture systems, without influencing the cement slurry performance, and the cement slurry prepared with the retarder has stable slurry bodies, short thickening transition time and adjustable thickening time; and the cement stoneshave high development speed of compressive strength and can meet the needs of medium-deep well cementing construction.

Description

technical field

[0001] The invention relates to a medium temperature retarder for oil well cement. Background technique

[0002] Currently commercially available retarders include lignosulfonates, hydrocarbon ethyl cellulose, hydroxymethyl hydroxyethyl cellulose and weak organic acids. The most commonly used cement retarders are sodium lignosulfonate or calcium lignosulfonate. Works well as a set retarder at cycling temperatures of about 90°C. One of its disadvantages is inconsistency. Depending on whether the source is hardwood or softwood, differences may even be observed at different times when the trees were felled. Using lignosulfonate requires extensive experimentation to determine thickening time due to inconsistent performance and the presence of impurities. The maximum temperature that lignosulfonate can use is about 115°C, and the maximum temperature can be as high as 200°C or more by adding retarding enhancers such as organic acids or water-soluble borates. C...

Examples

Embodiment 1

[0018] Weigh various samples according to the following parts by weight:

[0019] Water: sodium hydroxyethylidene diphosphonate: citric acid: boric acid: alkylene phosphonic acid = 1: 0.02: 0.02: 0.05: 0.01

[0020] Add the above-mentioned materials in turn into the stirring cup, turn on the stirrer, the stirring speed is 4000r / min, and the stirring time is 5min to make a medium temperature retarder. Use R01 as the retarder code.

[0021] Mix the cement slurry performance of this retarder under the different test conditions of table 1

[0022]

Embodiment 2

[0024] Weigh various samples according to the following proportions:

[0025] Water: sodium hydroxyethylidene diphosphonate: glucoheptanoic acid: boric acid: alkylene phosphonic acid = 1: 0.01: 0.03: 0.08: 0.01

[0026] Add the above-mentioned materials in turn into the stirring cup, turn on the stirrer, the stirring speed is 4000r / min, and the stirring time is 5min to make a medium temperature retarder. Use R02 as the retarder code.

[0027] Mix the cement slurry performance of this retarder under the different test conditions of table 2

[0028]

Embodiment 3

[0030] Weigh various samples according to the following proportions:

[0031] Water: sodium hydroxyethylidene diphosphonate: gluconic acid: boric acid: alkylene phosphonic acid = 1: 0.05: 0.02: 0.10: 0.02

[0032] Add the above-mentioned materials in turn into the stirring cup, turn on the stirrer, the stirring speed is 4000r / min, and the stirring time is 5min to make a medium temperature retarder. Use R02 as the retarder code.

[0033] Mix the cement slurry performance of this retarder under the different test conditions of table 2

[0034]

technical field

[0001] The invention relates to a medium temperature retarder for oil well cement. Background technique

[0002] Currently commercially available retarders include lignosulfonates, hydrocarbon ethyl cellulose, hydroxymethyl hydroxyethyl cellulose and weak organic acids. The most commonly used cement retarders are sodium lignosulfonate or calcium lignosulfonate. Works well as a set retarder at cycling temperatures of about 90°C. One of its disadvantages is inconsistency. Depending on whether the source is hardwood or softwood, differences may even be observed at different times when the trees were felled. Using lignosulfonate requires extensive experimentation to determine thickening time due to inconsistent performance and the presence of impurities. The maximum temperature that lignosulfonate can use is about 115°C, and the maximum temperature can be as high as 200°C or more by adding retarding enhancers such as organic acids or water-soluble borates. C...

Examples

Embodiment 1

[0018] Weigh various samples according to the following parts by weight:

[0019] Water: sodium hydroxyethylidene diphosphonate: citric acid: boric acid: alkylene phosphonic acid = 1: 0.02: 0.02: 0.05: 0.01

[0020] Add the above-mentioned materials in turn into the stirring cup, turn on the stirrer, the stirring speed is 4000r / min, and the stirring time is 5min to make a medium temperature retarder. Use R01 as the retarder code.

[0021] Mix the cement slurry performance of this retarder under the different test conditions of table 1

[0022]

Embodiment 2

[0024] Weigh various samples according to the following proportions:

[0025] Water: sodium hydroxyethylidene diphosphonate: glucoheptanoic acid: boric acid: alkylene phosphonic acid = 1: 0.01: 0.03: 0.08: 0.01

[0026] Add the above-mentioned materials in turn into the stirring cup, turn on the stirrer, the stirring speed is 4000r / min, and the stirring time is 5min to make a medium temperature retarder. Use R02 as the retarder code.

[0027] Mix the cement slurry performance of this retarder under the different test conditions of table 2

[0028]

Embodiment 3

[0030] Weigh various samples according to the following proportions:

[0031] Water: sodium hydroxyethylidene diphosphonate: gluconic acid: boric acid: alkylene phosphonic acid = 1: 0.05: 0.02: 0.10: 0.02

[0032] Add the above-mentioned materials in turn into the stirring cup, turn on the stirrer, the stirring speed is 4000r / min, and the stirring time is 5min to make a medium temperature retarder. Use R02 as the retarder code.

[0033] Mix the cement slurry performance of this retarder under the different test conditions of table 2

[0034]

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