Gel polymer for bionic while-drilling pressure-bearing plugging drilling fluid

A technology of gel polymer and plugging agent, which is applied in the field of oil and gas well drilling, which can solve the problems of poor adhesion, poor adaptability of leakage layer size, non-deformability, etc., so as to improve the success rate and avoid the effect of flushing failure

Active Publication Date: 2021-11-16
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to synthesize a kind of defect that overcomes the non-deformability of traditional inert leakage plugging granular materials and the poor adaptability of leakage layer size, and makes up for the shortcomings of conventional water-absorbing polymer gel particles. In order to achieve the above object, the present invention provides a gel polymer suitable for leakage plugging agent, the gel polymer contains amide structural units , carboxylic acid structural unit and quinone structural unit;

Method used

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  • Gel polymer for bionic while-drilling pressure-bearing plugging drilling fluid
  • Gel polymer for bionic while-drilling pressure-bearing plugging drilling fluid
  • Gel polymer for bionic while-drilling pressure-bearing plugging drilling fluid

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preparation example Construction

[0029] The second aspect of the present invention provides a method for preparing a gel polymer suitable for a lost circulation agent, the method comprising: in an aqueous solvent, in the presence of an initiator, an amide monomer, a carboxylic acid monomer and a benzene Diphenolic monomers carry out solution polymerization reaction, wherein, the amide monomers are selected from one or more of the monomers shown in formula (1') and formula (2'); the carboxylic acid monomers The monomer is selected from one or more of the monomers shown in formula (3'); the diphenol monomer is selected from one or more of the monomers shown in formula (4');

[0030]

[0031] Among them, R 1 -R 3 , R 5 -R 7 , R 10 -R 12 and R 14 -R 16 each independently selected from H and C1-C6 alkyl; R 4 Alkyl selected from H, C1-C8 or -L 2 -SOOM,L 2 An alkylene group selected from C1-C6, M is H or an alkali metal element; R 8 and R 9 each independently selected from H and C1-C6 alkyl, or R 8 a...

Embodiment 1

[0047] This example is used to illustrate the gel polymer of the present invention and its preparation method.

[0048] Add 3 g of acrylamide monomer into 100 ml of distilled water, then add 3 g of acrylic acid monomer, and finally add 2 g of 3-methacrylamide dopamine monomer. Stir at 30°C (stirring rate 150r / min) until dissolved. Introduce high-purity nitrogen to remove oxygen in the system, and nitrogen inflow time is 30min. After that, the initiator azobisisobutyronitrile (mass addition: 0.1% by weight, relative to the total weight of the monomers) was added dropwise. Gradually raise the temperature to 55°C and react for 5h. The polymer water-absorbing gel product can be produced. Pour the product into a beaker filled with 200ml of distilled water, stir for 2-5 minutes, and then filter to remove unreacted monomers. The washed product was dried in an oven at 75 °C for 36 h until constant weight. The dried product is pulverized by a pulverizer and screened with an analyt...

Embodiment 2

[0050] This example is used to illustrate the gel polymer of the present invention and its preparation method.

[0051] In 100ml of distilled water, add 4g total amount of acrylamide and N-vinyl caprolactam monomer (the molar ratio of acrylamide and N-vinyl caprolactam is 1:1), then add 3g total amount of acrylic acid and methacrylic acid monomer (the molar ratio of acrylic acid and methacrylic acid is 1:1), finally add 3-methacrylamido dopamine and N-[2-(3,4-dihydroxyphenyl) ethyl]-2 - Acrylamide monomer (3-methacrylamido dopamine and N-[2-(3,4-dihydroxyphenyl)ethyl]-2-acrylamide in a molar ratio of 1:1). Stir at 30°C (stirring rate 170r / min) until dissolved. Introduce high-purity nitrogen to remove oxygen in the system, and nitrogen inflow time is 30min. Then, the initiator azobisisobutyronitrile (mass addition: 0.25% by weight, relative to the total weight of the monomers) was added dropwise. Gradually raise the temperature to 60°C and react for 5.5h. The polymer water-...

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Abstract

The invention relates to the field of oil and gas well drilling, in particular to a gel polymer for bionic while-drilling pressure-bearing plugging drilling fluid. The gel polymer contains an amide structural unit, a carboxylic acid structural unit and a benzenediol structural unit, wherein the amide structural unit is selected from one or more of structural units as shown in a formula (1) and a formula (2); the carboxylic acid structural unit is selected from one or more of structural units as shown in a formula (3); and the benzenediol structural unit is selected from one or more of structural units as shown in a formula (4). According to the gel polymer disclosed by the invention, catechol groups, with a strong adhesion effect, of marine mussels are introduced into a polymer water-absorbing gel network by utilizing a bionics principle, and while-drilling plugging particles with a strong adhesion effect are prepared, so that pressure-bearing plugging of permeable leakage is realized, and a plugging layer is prevented from being dispersed and losing efficacy due to pressure fluctuation in a shaft.

Description

technical field [0001] The invention relates to the field of oil and gas well drilling, in particular to a gel polymer for a bionic while-drilling pressure-bearing plugging drilling fluid. Background technique [0002] Lost circulation will not only cause a large loss of drilling fluids such as drilling fluid and completion fluid, but also increase the non-production time, thereby increasing the comprehensive well construction cost of oil and gas wells. According to the degree of loss, lost circulation can be divided into permeability loss, malignant loss and return loss. Generally, due to the low loss rate of permeability loss, there is no need to stop drilling. LCM can be added to the drilling fluid, and enter the inside of the wellbore through normal drilling fluid circulation. The tight sealing layer can reduce the size of the leakage channel, thereby reducing the rate of drilling fluid loss. At present, there are mainly two types of granular LWD plugging agents, one i...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F2/10C09K8/035C09K8/24
CPCC08F220/56C08F220/06C08F2/10C09K8/035C09K8/24C08F220/58
Inventor 蒋官澄董腾飞孙金声崔凯潇贺垠博杨丽丽骆小虎耿铁罗健生尤志良滕国权冉启发史赫
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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