Colloidal polymer, preparation method thereof and polymer weak gel drilling fluid

A polymer and gel-forming technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of weak gel system losing plugging and leaking channels and adjusting rheology, strict on-site construction requirements, aluminum cross-linking To solve the problems of precipitation and precipitation of the agent, it can achieve the effect of good filtrate reduction performance, good viscosity improvement effect and high viscosity retention rate.

Inactive Publication Date: 2018-12-07
HENGXIANG SCI & TECH KELAMAYI CITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In summary, the problems in the prior art are: Aluminum cross-linking agents are prone to precipitation in high-temperature environments, resulting in weak gel systems losing the ability to block leakage channels and adjust rheology due to the loss of cross-linking properties, while chromium cross-linking agents, formaldehyde and phenol cross-linking systems have no effect on The environment has a very toxic effect, especially formaldehyde and phenol are also highly carcinogenic, which cannot meet the increasingly stringent on-site construction requirements

Method used

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  • Colloidal polymer, preparation method thereof and polymer weak gel drilling fluid
  • Colloidal polymer, preparation method thereof and polymer weak gel drilling fluid
  • Colloidal polymer, preparation method thereof and polymer weak gel drilling fluid

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preparation example Construction

[0041] Such as figure 1 As shown, the gel-forming polymer and preparation method thereof provided by the embodiments of the present invention comprise the following steps:

[0042] S101: Weigh four monomers, the molar ratio is alkenyl amide: alkenyl propanesulfonic acid: alkenyl ammonium chloride: N,N-methylenebisacrylamide = (15~20): (4~8) :(2~5):(0.5~1);

[0043] S102: Dissolve alkenylpropanesulfonic acid in deionized water, neutralize it with an appropriate amount of alkaline substance to pH = 7, pour it into a reaction vessel, and put alkenyl amide, alkenyl ammonium chloride and N,N-methylenebis Acrylamide, mixed and stirred, nitrogen exhausted;

[0044] S103: After passing nitrogen for 30 minutes, heat up to 45-65°C, add 0.3%-0.6wt% initiator, the total monomer concentration is 15-30%, and take out the white gel-like product after reacting for 5-9 hours, that is It is a crude product of gel-forming polymer;

[0045] S104: dissolving the crude product of the gel-formi...

Embodiment 1

[0052] Preparation of gel-forming polymer PTTS-1

[0053] Dissolve 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in deionized water, neutralize the solution to pH=7~8 with NaOH, and add acrylamide (AM), trihydroxyethyl allyl Ammonium chloride (TAAC) and N,N-methylene bisacrylamide (MBA) are mixed with the neutralized solution, and then added to a three-necked flask with a thermometer and a reflux device, stirred, nitrogen and oxygen exhausted. Gradually raise the temperature to 50°C, add 0.3% initiator ammonium persulfate-sodium bisulfite after passing nitrogen for 30 minutes, and the total monomer concentration is 20%, after reacting for 7 hours, wash the white gel-like product with absolute ethanol Fully wash, separate the precipitate, dry and pulverize at high temperature to obtain the gel-forming polymer PTTS-1, and obtain the target product with a yield of 91.5%. The reaction formula is as follows:

[0054]

[0055] Structural characterization of gel-forming polyme...

Embodiment 2

[0060] Preparation of gel-forming polymer PTTS-2

[0061] Dissolve 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in deionized water, neutralize the solution to pH=7~8 with NaOH, and N,N-dimethylacrylamide (DMAA), Trihydroxyethyl allyl ammonium chloride (TAAC) and N, N-methylenebisacrylamide (MBA) are mixed with the neutralized solution, and then added to a three-necked flask with a thermometer and a reflux device, stirred, and passed Nitrogen exhaust. Gradually raise the temperature to 50°C, add 0.3% initiator ammonium persulfate-sodium bisulfite after passing nitrogen for 30 minutes, and the total monomer concentration is 20%, after reacting for 7 hours, wash the white gel-like product with absolute ethanol Fully wash, separate the precipitate, dry and pulverize at high temperature to obtain the gel-forming polymer PTTS-2, and obtain the target product with a yield of 91.2%. The reaction formula is as follows:

[0062]

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Abstract

The invention belongs to the field of polymer weak gel for a water-based drilling fluid and the preparation thereof and discloses a colloidal polymer, a preparation method thereof and a polymer weak gel drilling fluid. The colloidal polymer is formed by copolymerizing the raw materials according to a free radical solution polymerization method, wherein the raw materials include four monomers, namely alkenyl amide, allyl propyl sulfonic acid, alkenyl ammonium chloride and N,N-methylene bisacrylamide at a certain ratio. The relative molecular mass of the polymer is 20-40 ten thousands. The colloidal polymer disclosed by the invention has an excellent heat-resisting property (capable of resisting a temperature high up to 220 DEG C), is capable of maintaining strong colloidal property in an environment of high temperature and high mineralization degree and has an excellent de-filtration property; a base pulp system added with the polymer has a better rheological property, will not thickenat a high temperature and is capable of meeting the requirements of current deep drilling operations; the preparation method is simple, the condition is mild and the yield is higher.

Description

technical field [0001] The invention belongs to the field of polymer weak gel for water-based drilling fluid in the petroleum drilling process and its preparation, and in particular relates to a gel-forming polymer, a preparation method thereof, and a polymer weak gel drilling fluid. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: The polymer weak gel drilling fluid system has the advantages of strong adaptability to different loss formations, improved wellbore stability, low clay phase content, strong rock-carrying ability and little damage to reservoirs, etc., and is widely used in drilling operations at home and abroad has been widely used. Cross-linked polymers that can form weak gels are the core components of this type of drilling fluid system. At present, the most widely used gel-forming polymers are mostly polyacrylamide or polysaccharides. Ions undergo complexation, form a weak gel through intermole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F220/56C08F220/54C08F220/58C08F226/02C08F222/38
CPCC08F220/54C08F220/56C09K8/035C08F220/585C08F226/02C08F222/385
Inventor 陶梅罗霄罗桂玲任晗
Owner HENGXIANG SCI & TECH KELAMAYI CITY
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