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Anti-calcium zwitterionic polymer, preparation method and application thereof, and water-based drilling fluid containing said polymer as dispersant

A water-based drilling fluid and zwitterion technology, applied in the field of drilling fluid, can solve the problems of large filtration loss and poor dispersion, and achieve the effects of good dispersion, good compatibility and easy dispersion.

Active Publication Date: 2020-12-08
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of excessive flocculation, large filtration loss and poor dispersion due to the "dehydration" of calcium ions in the prior art high-calcium water-based drilling fluid

Method used

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  • Anti-calcium zwitterionic polymer, preparation method and application thereof, and water-based drilling fluid containing said polymer as dispersant
  • Anti-calcium zwitterionic polymer, preparation method and application thereof, and water-based drilling fluid containing said polymer as dispersant
  • Anti-calcium zwitterionic polymer, preparation method and application thereof, and water-based drilling fluid containing said polymer as dispersant

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specific Embodiment approach

[0076] In the present invention, according to a preferred embodiment, the preparation method of the polymer comprises the following steps:

[0077] (1) monomer A ', described monomer B ' and described monomer C ' are added in the there-necked flask filled with distilled water, stir until monomer is mixed, wherein, based on the consumption of distilled water, monomer The total dosage is 30-50% by weight;

[0078] (2) adding cosolvent, chain transfer agent and initiator to the aqueous solution of step (1), stirring uniformly;

[0079] (3) After the addition is completed, the three-necked flask is sealed and a nitrogen-passing device is added, and nitrogen is introduced into the three-necked flask. After fully removing the air in the bottle, the temperature is increased at 45-75 ° C to carry out the polymerization reaction for 7-10h, and after the reaction is completed, it reaches At room temperature, a solution containing the polymer was obtained.

[0080] The preparation meth...

Embodiment 1

[0119] (1) The polymer composition (58.32g of monomer A', 15.12g of monomer B' and 6.56g of monomer C') was added to a three-necked flask containing 200g of distilled water, and carried out at 25°C Heating in a water bath, stirring until the monomers are evenly mixed, the monomer A' is the sodium 2-acrylamido-2-methylpropanesulfonate of the structure shown in formula (I4); the monomer B' is the formula (IV) ) the diallyl dimethyl ammonium chloride of the structure shown; Described monomer C ' is the methacryloyl ethyl sulfobetaine of the structure shown in formula (V1);

[0120] (2) the aqueous solution of step (1) is added the sodium chloride of 20g, the sodium formate of 0.24g and the potassium persulfate of 0.4g, stir;

[0121] (3) After the addition is completed, the three-necked flask is sealed and a nitrogen-passing device is added to introduce nitrogen into the three-necked flask. After fully removing the air in the flask, the temperature is raised to 70° C., and the po...

Embodiment 2-3

[0124] The polymer was prepared in a manner similar to that of Example 1, except that the types of the monomers A' used were different, and the rest were the same as in Example 1, and polymers S2 and S3 were obtained respectively, specifically:

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Abstract

The invention relates to the technical field of oil and gas drilling, and discloses a calcium-resistant zwitterionic polymer, its preparation method and application, and a water-based drilling fluid containing the polymer as a dispersant. The polymer contains structural unit A, structural unit B and a structural unit C, said structural unit A is at least one selected from the structural units having a structure shown in formula (11), a structure shown in formula (12) and a structure shown in formula (13); said structure Unit B is a structural unit having a structure shown in formula (2); said structural unit C is at least one selected from the structural units having a structure shown in formula (31) and a structure shown in formula (32); said The weight-average molecular weight of the polymer is 350,000-600,000. When the polymer provided by the invention is used as a drilling fluid dispersant, it can realize good hydration dispersion in a high-calcium environment, play a good dispersing effect, and improve the drilling fluid. thermal stability.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a polymer, a method for preparing the polymer, the polymer prepared by the method, the application of the polymer in drilling fluid, and the drilling fluid containing the polymer liquid. Background technique [0002] Drilling fluid is the circulating flushing medium used in the drilling process, known as the "blood" of drilling, which has the functions of suspending and carrying drill cuttings, preventing the collapse of the well wall, protecting oil and gas reservoirs, cooling and lubricating drilling tools, transmitting pump power, and recording geological conditions. Data and other functions are important factors that affect the success of drilling and drilling speed. [0003] At present, for water-based drilling fluids, calcium resistance is one of the technical problems that need to be solved urgently, and it has not been well solved for a long time. The "dehy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/58C08F226/02C08F220/36C09K8/24
CPCC08F220/58C09K8/24C08F212/30C08F226/06C08F220/36C08F228/02C08F2800/20C08F220/585
Inventor 贺垠博蒋官澄董腾飞杨丽丽李武泉刘海洋李小庆罗绪武赵利黄贤斌刘敬平邓金根
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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