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High-temperature stabilizer for high-density cement paste, and preparation method thereof

A technology of high temperature stabilizer and cement slurry, which is applied in the field of downhole operations in oil and gas fields, and can solve problems such as unfavorable industrial production and complex preparation process.

Inactive Publication Date: 2020-10-23
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the grafted high molecular polymer involved in the stabilizer is complex and requires multi-step reactions to prepare, which is not conducive to industrial production

Method used

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  • High-temperature stabilizer for high-density cement paste, and preparation method thereof
  • High-temperature stabilizer for high-density cement paste, and preparation method thereof
  • High-temperature stabilizer for high-density cement paste, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] A high-temperature stabilizer for high-density cement slurry, the preparation method of which is as follows:

[0037] 1) Slowly add 15g of Diyou gum to 80g of water, stir the solution continuously during the adding process, and control the stirring rate between 300-500r / min; NaOH and 5g of 2-acrylamide-2-methylpropanesulfonic acid, continue to stir until they are completely dissolved, and dropwise add NaOH solution until the pH of the solution is 5; heat the reaction solution to 60°C, add 0.2g of ammonium persulfate to carry out Free radical polymerization reaction, and continue to react for 4h, spray drying to make a uniform powdery solid, which is modified diyou gum;

[0038]2) Weigh 40g 2-acrylamido-2-methylpropanesulfonic acid, 15g acrylamide, 16.7g dimethyl diallyl ammonium chloride (60% solution), 35g N-vinyl caprolactam, 2g Dissolve divinylbenzene in 400g of water so that the monomer mass fraction in the resulting solution is 20%; add sodium hydroxide to adjust ...

Embodiment 2

[0041] A high-temperature stabilizer for high-density cement slurry, the preparation method of which is as follows:

[0042] 1) Slowly add 12g of Diyoujiao to 70g of water, stir the solution continuously during the adding process, the stirring rate is controlled between 300-500r / min; NaOH and 10g of 2-acrylamide-2-methylpropanesulfonic acid, continue to stir until they are completely dissolved, add NaOH solution dropwise until the pH of the solution is 5, heat the reaction solution to 60°C, add 0.3g of ammonium persulfate to initiate the reaction , after reacting for 4 hours, spray-dry to make a uniform powdery solid for subsequent use;

[0043] 2) Weigh 41.5g of 2-acrylamido-2-methylpropanesulfonic acid, 17.8g of acrylamide, 10.8g of dimethyl diallyl ammonium chloride (60% solution), 27.8g of N -Vinylcaprolactam, 1.30g of divinylbenzene was added in 533g of water, so that the monomer mass fraction in the resulting solution was 15%; sodium hydroxide was added to adjust the pH...

Embodiment 3

[0046] A high-temperature stabilizer for high-density cement slurry, the preparation method of which is as follows:

[0047] 1) Slowly add 10g of Diyou gum to 60g of water, stir the solution continuously during the addition process, and control the stirring rate between 300-500r / min; when the undetermined gum is fully hydrated and appears colloidal, add 5g of p-styrene Sodium sulfonate and 10g 2-acrylamide-2-methylpropanesulfonic acid, continue to stir until they are all dissolved, and add NaOH solution dropwise until the pH of the solution is 5.5 to obtain a reaction mixture; add 0.5g initiator I to the reaction mixture Carry out free radical polymerization, and continue to react for 4 hours, spray dry to make uniform powdery solid, which is modified diyou gum;

[0048] 2) Weigh 50g of 2-acrylamido-2-methylpropanesulfonic acid, 20g of acrylamide, 8.34g of dimethyl diallyl ammonium chloride (60% solution), 25g of N-vinylcaprolactam, 1g Divinylbenzene is dissolved in 476g wate...

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Abstract

The invention discloses a high-temperature stabilizer for high-density cement paste, and a preparation method thereof. The high-temperature stabilizer comprises, by weight, 76-84 parts of bentonite, 10-14 parts of modified diutan gum and 6-10 parts of a cross-linked copolymer, wherein the modified diutan gum is obtained by graft copolymerization of diutan gum with sodium p-styrenesulfonate and 2-acrylamide-2-methylpropanesulfonic acid; and the cross-linked copolymer is a cross-linked copolymer formed by copolymerizing 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, dimethyl diallyl ammonium chloride, N-vinyl caprolactam and divinyl benzene, and the molecular weight of the cross-linked copolymer is 7-9 * 10<5>. The high-temperature stabilizer has the characteristics of high viscosityat low temperature and tackifying at high temperature, remarkably improves the high-temperature stability of cement paste, solves the problem of poor high-temperature stability of the existing cementpaste, has no adverse effect on the comprehensive performance of the cement paste, and meets the requirements of field construction; and in addition, the preparation method of the stabilizer is simple, conditions are controlled, the cost is low, and the stabilizer has market popularization and application prospects.

Description

technical field [0001] The invention relates to the technical field of downhole operations in oil and gas fields, in particular to a high-temperature stabilizer for high-density cement slurry and a preparation method thereof. Background technique [0002] my country's deep oil and gas resources have become the main field of exploration and development. Cement slurry for high-temperature deep well cementing often uses soluble polymers as admixtures such as fluid loss reducer and retarder, which solves various problems such as large water loss at high temperature and difficult adjustment of thickening time. However, with the development of exploration and development to a deeper level, some defects of water-soluble polymers are gradually exposed during the application process, mainly reflected in that the viscosity of the polymer will decrease significantly with the increase of temperature, and the stability of the polymer system will weaken. Particle settlement intensifies, ...

Claims

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Application Information

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IPC IPC(8): C04B24/20C08F220/58C08F220/56C08F226/04C08F226/06C08F212/36C08F251/00C08F212/14
CPCC04B40/0039C08F251/00C08F220/585C04B14/104C04B24/22C08F220/56C08F226/04C08F226/06C08F212/36C08F212/30
Inventor 刘文明吴朝明齐奔林志辉付家文赵殊勋李小林凌勇陈绪王翔宇李中国李强任硕
Owner CNPC BOHAI DRILLING ENG
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