Method for preparing binary copolymer retarder for oil and gas well cementing

A binary copolymer, well cementing technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of complex raw materials and the effect of cement retarder retarding effect, etc., and achieve simple and good compatibility of raw materials The effect of sex, excellent technical effect

Inactive Publication Date: 2012-02-15
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Abstract
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Problems solved by technology

[0010] The prior art represented by the above-mentioned patent documents mainly solves the problem that the retarding effect of the cement retarder is better when used at a circulating temperature above 180 degrees. The ef

Method used

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  • Method for preparing binary copolymer retarder for oil and gas well cementing
  • Method for preparing binary copolymer retarder for oil and gas well cementing
  • Method for preparing binary copolymer retarder for oil and gas well cementing

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[0037] Example 1

[0038] The invention discloses a preparation method of a binary copolymer retarder for cementing oil and gas wells. The steps include:

[0039] (1) Dissolve 2-acrylamide-2-methylpropanesulfonic acid and itaconic acid in 200% deionized water of the total monomer mass according to the mass ratio of 73~75:25~27;

[0040] (2) Adjust the pH value of the solution in step (1) to 5~6 with a 50% mass volume concentration NaOH solution;

[0041] (3) place the solution obtained in step (2) in a three-necked flask, carry out a constant temperature water bath, and heat up to 60~65°C;

[0042] (4) dropwise adding an initiator accounting for 1.0% to 2.0% of the total monomer mass to the solution obtained in step (3), and the reaction time is continued for 4 to 6 hours to obtain the final product.

[0043] The retarder prepared by the above steps, compared with the existing similar technology, the present invention has the following technical advantages:

[0044] The met...

Example Embodiment

[0048] Example 2

[0049] The preparation method of the binary polymer retarder of the present invention is as follows:

[0050] According to the mass ratio of 75:25, 2-acrylamide-2-methylpropanesulfonic acid and itaconic acid were respectively weighed and dissolved in 200% deionized water of the total monomer mass; pH was adjusted with 50% mass volume concentration NaOH solution To 6; the solution was placed in a three-necked flask with a thermometer and a stirrer, the temperature in a constant temperature water bath was heated to 60 ° C, and an initiator potassium persulfate, which accounted for 2.0% of the total monomer mass, was added dropwise to the solution within 30 min, and the reaction time was 4 hours. The final product is obtained, a binary copolymer retarder.

[0051] The effect of the present invention is:

[0052] The retarder can effectively prolong the thickening time of cement slurry in the temperature range of 50~180℃. Taking Jiajiang Grade G cement as an ex...

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Abstract

The invention which discloses a method for preparing a binary copolymer retarder for oil and gas well cementing relates to the technical field of methods for preparing cement corrosion inhibitors for oil and gas wells. The method of the invention comprises the following steps: 1, respectively weighing 2-acrylamide-2-methylpropanesulfonic acid and itaconic acid according to a mass ratio of 73-75:25-27, and dissolving above monomers in deionized water, wherein the mass of deionized water accounts for 200% of the total mass of the monomers; 2, adjusting the pH value of a solution obtained in step 1 to 5-6 by a sodium hydroxide solution with the mass-volume concentration of 50%; 3, placing a solution obtained in step 2 in a three-neck flask, carrying out water bath at a constant temperature, and heating to 60-65DEG C; and 4, adding an initiator to a solution obtained in step 3 drop by drop, and continuously reacting for 4-6h to obtain final products, wherein the mass of the initiator accounts for 1.0-2.0% of the total mass of the monomers. The method of the invention has the advantages of simple process, low cost and less raw material, and the retarder prepared through the method can satisfactorily solve a technical problem "over retardation" of a high temperature cement mortar at a middle temperature of 50-180DEG C.

Description

[0001] technical field [0002] The invention relates to the technical field of preparation methods of oil and gas well cement corrosion inhibitors, in particular to a preparation method of an organic synthetic retarder for prolonging the thickening time of cement slurry in deep well cementing. Background technique [0003] The function of the cementing retarder is to effectively prolong or maintain the time that the cement slurry is in a liquid state and pumpable. A good retarder has a retarding effect in any temperature range, and the thickening time is proportional to the amount added, and has good adaptability to various oil well cements, and has good compatibility and compatibility with other admixtures. Capacitance. [0004] At present, the commonly used retarders for cementing slurry include the following types: lignosulfonate and its derivatives, such as sodium lignosulfonate, calcium lignosulfonate, etc. This kind of retarder can be used for cement slurry inje...

Claims

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Application Information

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IPC IPC(8): C08F220/58C08F222/06C09K8/467C04B24/16C04B103/22
Inventor 张成金严海兵冷永红李美平郑锟程欣伟
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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