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High-strength slow-crosslinked chromic gel and preparation method thereof

A high-strength, jelly technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of too fast gelation time and easy damage to the gelation strength, so as to prolong the gelation time and improve the gelling time. Strength and stability, and the effect of delaying the gelation time

Active Publication Date: 2019-08-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the deficiencies in the prior art, especially the problem that the gelling time of the existing high-strength chromium jelly is generally too fast, and at the same time, the existing delaying gelation method is easy to destroy the defect of the gelling strength, the present invention starts from the polymer point of view, By optimizing cationic polymers and using aluminum sol to delay gelation time and improve gel strength and long-term stability, a preparation method for high-strength slow-crosslinked chromium gel suitable for deep profile control is provided

Method used

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  • High-strength slow-crosslinked chromic gel and preparation method thereof
  • High-strength slow-crosslinked chromic gel and preparation method thereof

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Embodiment 1

[0032] First, prepare a 5% cationic AM / DAC binary copolymer mother liquor with a mass fraction of 2%, add 40g AM / DAC binary copolymer mother liquor, 0.3g chromium acetate and 1.0g aluminum sol in a beaker, and then add water to mix the solution Make up to 100g and stir well to obtain a gelatinous liquid. Place the gelatinous liquid in an ampoule, sinter and seal it with an alcohol blowtorch, and place it in a constant temperature water bath at 90°C for aging to obtain the jelly of the present invention.

Embodiment 2

[0034] First, prepare a 15% cationic AM / DAC binary copolymer mother liquor with a mass fraction of 2%, add 40g AM / DAC binary copolymer mother liquor, 0.3g chromium acetate and 1.0g aluminum sol in a beaker, and then add water to mix the solution Make up to 100g and stir well to obtain a gelatinous liquid. Place the gelatinous liquid in an ampoule, sinter and seal it with an alcohol blowtorch, and place it in a constant temperature water bath at 90°C for aging to obtain the jelly of the present invention.

Embodiment 3

[0036] First, prepare a 30% cationic AM / DAC binary copolymer mother liquor with a mass fraction of 2%, add 40g AM / DAC binary copolymer mother liquor, 0.3g chromium acetate and 1.0g aluminum sol in a beaker, and then add water to mix the solution Make up to 100g and stir well to obtain a gelatinous liquid. Place the gelatinous liquid in an ampoule, sinter and seal it with an alcohol blowtorch, and place it in a constant temperature water bath at 90°C for aging to obtain the jelly of the present invention.

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Abstract

The invention relates to high-strength slow-crosslinked chromic gel and a preparation method thereof. The gel comprises, by mass, 0.6-1.0% of a main agent, 0.2-0.4% of a cross-linking agent, 0.5-1.5%of a stabilizer and the balance water, wherein the percentage sum of the components is 100%, the main agent is an AM / DAC biopolymer, the cross-linking agent is chromium acetate, and the stabilizer isaluminum sol. The chromic gel is high in gel forming strength which can reach 15 Pa or above. The gel forming time is controllable and is in the range of 42-70 hours, the field operation requirementsof deep profile control can be met, and an effective plugging effect can be achieved in an oil reservoir environment at the temperature of 90 DEG C.

Description

[0001] Technical field: [0002] The invention relates to a high-strength slow-crosslinking chromium jelly and a preparation method thereof, and belongs to the technical field of oil field chemistry. [0003] Background technique: [0004] Profile control of water injection wells and water plugging in oil wells are important technologies for enhancing oil recovery, as well as indispensable supporting technologies for other technologies for enhancing oil recovery. Jelly type plugging agent is the most widely used type of plugging agent at home and abroad due to its convenient use and good shear resistance. This type of plugging agent reacts with a suitable cross-linking agent under certain temperature and pH conditions to form a complex, three-dimensional spatial network structure. Among them, the organic chromium jelly uses Cr 3+ Multi-nuclear hydroxyl bridged ion crosslinking solution with -COO - The polymer (such as HPAM) is produced, and it has been widely used in profile control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
CPCC09K8/5045C09K8/512C09K8/845C09K8/887
Inventor 葛际江徐元德吴昊潘逸平吴千慧宋龙飞
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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