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Polycarboxylic dispersant for oil-well cement and preparation method of polycarboxylic dispersant

A technology of oil well cement and polycarboxylic acid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high salt content, poor rheological properties, poor salt resistance, etc., and achieve monomer conversion High efficiency, safe use and easy storage

Active Publication Date: 2018-01-19
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventor has found that there are at least the following problems in the prior art: the existing polycarboxylate dispersants for oil well cement have poor salt tolerance and can only be used in freshwater cement slurry systems. Rheological properties worsen in salt water slurry system
With the continuous development of oil and gas field development, in the process of drilling in my country's Western Oilfield, Zhongyuan Oilfield, and South China Sea Oilfield, we have encountered complex formations such as high-pressure saline layers, large sections of salt-gypsum layers, or water-sensitive formations to varying degrees. The formation has a high salt content, and the existing polycarboxylate dispersants cannot be used in the oil and gas well cementing projects in the formation with a high salt content.

Method used

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preparation example Construction

[0050] In the second aspect, the embodiment of the present invention provides a preparation method of the above-mentioned polycarboxylic acid dispersant. The monomers of the above-mentioned polycarboxylic acid dispersant are highly reactive ethylenic monomers, so the above-mentioned polycarboxylic acid dispersant can be prepared by free radical polymerization. At the same time, since the above-mentioned monomers are all water-soluble monomers, the polymerization method can be aqueous solution polymerization, and a water-soluble initiator is used to initiate the polymerization reaction. An optional preparation method is as follows, comprising the following steps:

[0051] Step 1, add 2-acrylamido-2-methylpropanesulfonic acid monomer, acrylic acid monomer, N-vinylpyrrolidone monomer, itaconic acid monomer, sodium vinylsulfonate monomer, ethylene sodium base benzene sulfonate monomer and allyl polyethylene glycol monomer; wherein, the weight average molecular weight of allyl pol...

Embodiment 1

[0077] This embodiment provides a polycarboxylic acid dispersant for oil well cement. Base-2-methylpropanesulfonic acid, sodium vinylsulfonate, sodium vinylbenzenesulfonate and APEG-2100 are copolymers of monomers.

[0078] The preparation method of this polycarboxylic acid dispersant comprises the following steps:

[0079] Step 101, at room temperature, add 400ml of water to a four-necked flask equipped with a stirrer, a nitrogen pipe, a vent pipe and a thermometer, and then add 1g of acrylamide and 20g of 2-acrylamido-2-methylpropanesulfonate to the water in sequence acid, 2g acrylic acid, 3g maleic anhydride, 3.5g N-vinylpyrrolidone, 4g itaconic acid, 10g sodium vinylsulfonate, 4g sodium vinylbenzenesulfonate, and 70g APEG-2100. After each monomer is added, the reaction system is stirred at room temperature until the monomer is completely dissolved before adding the next monomer.

[0080] Step 102, using sodium hydroxide to adjust the pH value of the reaction system obtai...

Embodiment 2

[0102] This embodiment provides a polycarboxylic acid dispersant for oil well cement. Base-2-methylpropanesulfonic acid, sodium vinylsulfonate, sodium vinylbenzenesulfonate and APEG-2100 are copolymers of monomers.

[0103] The preparation method of this polycarboxylic acid dispersant comprises the following steps:

[0104] Step 201, at room temperature, add 400ml of water to a four-neck flask equipped with a stirrer, a nitrogen pipe, a vent pipe and a thermometer, and then add 1g of acrylamide and 30g of 2-acrylamido-2-methylpropanesulfonate to the water in sequence acid, 3 g acrylic acid, 3 g maleic anhydride, 3.5 g N-vinylpyrrolidone, 4 g itaconic acid, 10 g sodium vinyl sulfonate, 4 g sodium vinyl benzene sulfonate, and 70 g APEG-2100. After each monomer is added, the reaction system is stirred at room temperature until the monomer is completely dissolved before adding the next monomer.

[0105] Step 202, using sodium hydroxide to adjust the pH value of the reaction syst...

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Abstract

The invention discloses a polycarboxylic dispersant for oil-well cement and a preparation method of the polycarboxylic dispersant, and belongs to the technical field of oil-well cement additives. Thepolycarboxylic dispersant is a copolymer which is prepared from monomers composed of acrylic acid, N-vinyl pyrrolidone, itaconic acid, 2-acrylamido-2-methylpropanesulfonic acid, sodium vinyl sulfonate, sodium vinyl benzenesulfonate and allyl polyethylene glycol, wherein the weight-average molecular weight of allyl polyethylene glycol is 300-2400, and when the total mass of the monomers is 100%, the monomers comprises 0.5-20% of acrylic acid, 0.5-15% of N-vinyl pyrrolidone, 0.5-10% of itaconic acid, 5-60% of 2-acrylamido-2-methylpropanesulfonic acid, 0.5-30% of sodium vinyl sulfonate, 0.5-30% of sodium vinyl benzenesulfonate and 20-70% of allyl polyethylene glycol; the weight-average molecular weight of the polycarboxylic dispersant is 5000-250,000. The polycarboxylic dispersant has the advantages of good salt tolerance, high temperature resistance and rheological properties.

Description

technical field [0001] The invention relates to the technical field of oil well cement additives, in particular to a polycarboxylic acid dispersant for oil well cement and a preparation method thereof. Background technique [0002] Oil well cement is cement used in oil and gas well cementing engineering. Dispersant is an important oil well cement admixture. Its main function is to improve the rheological properties of cement slurry under the condition that the amount of cementitious material and the amount of mixing water remain unchanged. For cement dispersants, its development has gone through three generations. The first-generation dispersant is a dispersant represented by lignin, and the second-generation dispersant is a dispersant represented by a naphthalene-based dispersant. These two generations of dispersants mainly rely on adsorption on the surface of cement particles, and use electrostatic repulsion as the means of dispersion. The system has a high absolute Zeta...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/58C08F220/06C08F226/10C08F222/02C08F228/02C08F212/14C09K8/467C04B24/16C04B103/30
Inventor 辛海鹏曾建国孙富全王建瑶李鹏晓刘爱萍邹建龙高永会
Owner BC P INC CHINA NAT PETROLEUM CORP
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