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Preparation and application methods of high temperature resistant cement retarder

A high-temperature-resistant cement and retarder technology, applied in the field of cement additives, can solve the problems of negative impact on the safety of cementing operations, etc., and achieve the effects of wide application temperature range, good salt water resistance, and no volume shrinkage

Active Publication Date: 2014-04-23
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

[0004] At present, domestic production and use of oil well cement retarders for well temperatures above 80°C generally have defects. The applicable temperature range is generally only 40°C, and they are highly sensitive to temperature. When the temperature increases or decreases by 10°C, the amount added will increase or decrease by half, which will have a negative impact on the safety of cementing operations

Method used

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  • Preparation and application methods of high temperature resistant cement retarder
  • Preparation and application methods of high temperature resistant cement retarder
  • Preparation and application methods of high temperature resistant cement retarder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve 2-acrylamido-2-methylpropanesulfonic acid, 25% itaconic acid and 15% maleic acid that account for 60% of the total mass of the monomer in water that is 3 times the total mass of the monomer. Introduce nitrogen to remove oxygen for 20 minutes, add initiator ammonium persulfate accounting for 2% of the total mass of the monomer, react at 80°C for 3 hours, and then cool to room temperature to obtain the high temperature resistant cement retarder.

[0025] The infrared spectrum of the high temperature resistant cement retarder is as follows figure 1 As shown, of which 3463.59cm -1 It is the stretching vibration absorption peak of N-H in 2-acrylic acid amido-2-methylpropanesulfonic acid; 2970.99cm -1 、2944.21cm -1 is the stretching vibration absorption peak of carboxylic acid C-H; 1724.94cm -1 It is the stretching vibration absorption peak of carboxylic acid C=O; 1649.91cm -1 It is the stretching vibration absorption peak of C=O in the amide group; 1555.39cm -1...

Embodiment 2

[0033] Dissolve 2-acrylamido-2-methylpropanesulfonic acid, 30% itaconic acid and 20% maleic acid that account for 50% of the total mass of the monomer in water that is 4 times the total mass of the monomer. Nitrogen was added to deoxygenate for 30 minutes, an initiator ammonium persulfate accounting for 3% of the total mass of the monomer was added, reacted at 80°C for 4 hours, and then cooled to room temperature to obtain the high temperature resistant cement retarder.

[0034] Then use NaOH aqueous solution to adjust the pH of the above-mentioned high temperature resistant cement retarder to 6, and its storage time can exceed two years.

Embodiment 3

[0036] 2-acrylamido-2-methylpropanesulfonic acid, 40% itaconic acid and 20% maleic acid that account for 40% of the total mass of the monomers are dissolved in water that is 3 times the total mass of the monomers. Nitrogen was added to deoxygenate for 20 minutes, an initiator ammonium persulfate accounting for 2% of the total mass of the monomer was added, reacted at 80°C for 3 hours, and then cooled to room temperature to obtain the high temperature resistant cement retarder.

[0037] Then use sodium carbonate aqueous solution to adjust the pH=6.8 of the above-mentioned high temperature resistant cement retarder, and its storage time can exceed two years.

[0038] The properties of the high-temperature-resistant cement retarder obtained in Examples 2 and 3 are the same as those obtained in Example 1. It can be used in the temperature range of 100 to 230 ° C, the addition amount is not sensitive, the thickening transition time is short, and it is similar to Other oil well ceme...

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Abstract

The invention discloses preparation and application methods of a high temperature resistant cement retarder. The preparation method comprises the steps of dissolving 2-acrylamido-2-methyl propanesulfonic acid accounting for 40-60% of the total monomer by mass, itaconic acid accounting for 20-40% of the total monomer by mass and maleic acid accounting for 10-20% of the total monomer by mass into water with mass 2-4 times the total mass of the monomer, removing oxygen, adding an initiator ammonium persulfate accounting for 1.5-3% of the total monomer by mass, reacting at 75-100 DEG C for 3-6 hours, and then cooling the reactant to the room temperature, thus obtaining the high temperature resistant cement retarder. The high temperature resistant cement retarder prepared by the method can be used in the temperature range of 100-230 DEG C, is insensitive in additive amount, has short thickening transition time, is well matched with other oil well cement additives, does not have adverse effects on strength development of set cement, and has good salt resistance.

Description

technical field [0001] The invention belongs to the field of cement additives, in particular to a method for preparing and using a high-temperature-resistant cement retarder. Background technique [0002] With the improvement of drilling technology and the increase of difficulty in oilfield production, drilling has developed into deep wells, ultra-deep wells, and complex wells, and the temperature and pressure at the bottom of the well have increased significantly. well construction requirements. In order to ensure the safety of construction, it is necessary to add a suitable retarder to the cement slurry so that the cementing operation can be carried out safely and smoothly. [0003] The existing cement retarders mainly include tannin derivatives, lignite preparations, sugar compounds, boric acid and its salts, organic phosphonates, lignosulfonate and its modified products, hydroxyethyl cellulose, Carboxymethyl hydroxyethyl cellulose, organic acids, synthetic organic poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F222/02C09K8/467C04B24/12C04B103/30
Inventor 刘景丽王野赵德喜王菁任路
Owner BC P INC CHINA NAT PETROLEUM CORP
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