Polymer, preparation method and application thereof, and drilling fluid containing the polymer

A polymer composition and polymer technology, applied in the field of drilling fluid, can solve the problems of poor dispersion and large fluid loss, and achieve the effects of good compatibility, good dispersion and improved stability

Active Publication Date: 2020-05-19
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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  • Polymer, preparation method and application thereof, and drilling fluid containing the polymer
  • Polymer, preparation method and application thereof, and drilling fluid containing the polymer
  • Polymer, preparation method and application thereof, and drilling fluid containing the polymer

Examples

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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) Add the monomer A', the monomer B' and the monomer C' into a three-necked flask filled with distilled water, and stir until the monomers are evenly mixed, wherein, based on the amount of distilled water, the monomer The total consumption is 30-50% by weight;

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

[0079] (3) After the addition is complete, seal the three-necked flask and add a nitrogen device, feed nitrogen into the three-necked flask, fully remove the air in the bottle, and then heat up at 45-75°C for 7-10 hours of polymerization reaction. After the reaction is completed, cool to At room temperature, a solution containing polymer was obtained.

[0080] The preparation method provided by the invention can obtain a high-concentration polymer solution, which ca...

Embodiment 1

[0120] (1) Add the polymer composition (58.32g of monomer A', 15.12g of monomer B' and 6.56g of monomer C') into a three-necked flask filled with 200g of distilled water at 25°C Heating in a water bath and stirring until the monomers are evenly mixed, the monomer A' is sodium 2-acrylamido-2-methylpropanesulfonate of the structure shown in formula (I4); the monomer B' is the formula (IV ) diallyldimethylammonium chloride of the structure shown; the monomer C' is methacryloyl ethyl sulfobetaine of the structure shown in formula (V1);

[0121] (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;

[0122] (3) After the addition is complete, seal the three-necked flask and add a nitrogen device to feed nitrogen into the three-necked flask. After fully removing the air in the bottle, raise the temperature to 70°C and polymerize at a constant temperature for 8 hours. After the reaction is com...

Embodiment 2-3

[0125] The polymer is prepared in a manner similar to that of Example 1, except that: the type of monomer A' used is different, and all the other are the same as in Example 1 to obtain polymers S2 and S3 respectively, specifically:

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Abstract

The invention relates to the technical field of oil-gas drilling. The invention discloses a polymer, a preparation method and an application thereof, and a water-based drilling fluid containing the polymer, wherein the polymer contains a structural unit A, a structural unit B and a structural unit C; the structural unit A is selected from at least one of structural units having a structure represented by a formula (11), a structure represented by a formula (12) and a structure represented by a formula (13); the structural unit B is a structural unit with a structure shown in a formula (2); thestructural unit C is selected from at least one of structural units with a structure shown in a formula (31) and a structure shown in a formula (32); 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 dispersing agent, good hydration dispersion can be realized in a high-calcium environment, so that a good dispersion effect is achieved, and the thermal stability of a drilling fluid is improved.

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 a polymer, a polymer prepared by the method, the application of the polymer in drilling fluid, and a drilling fluid containing the polymer. liquid. Background technique [0002] Drilling fluid is a circulating flushing medium used in the drilling process. It is called the "blood" of drilling. Data and other functions are important factors that affect the success of drilling and the drilling speed. [0003] At present, for water-based drilling fluids, anti-calcium is one of the technical problems that need to be solved urgently, and it has not been well solved for a long time. The "dehydration" effect of calcium ions will compress the diffuse electric double layer of colloids such as clay, causing problems such as excessive flocculation of drilling fluid, a substantial increase in viscosity and shear force, and a sharp increase in f...

Claims

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Application Information

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Patent Type & Authority Applications(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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