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Preparation method of ground surface crosslinking weak jelling particle

A weak gel and ground technology, applied in the field of preparation of new gel particles, can solve the problems of difficult to get out, increase the effective volume, high synthesis cost, etc., and achieve the effect of easy injection, wide application range and easy deformation

Inactive Publication Date: 2003-07-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, emulsion polymerization also has its inherent disadvantages: due to the introduction of emulsifiers, the synthesis cost is too high, and the product contains surfactants and initiator decomposition products, which are difficult to get out, so they will remain in the formation; in addition, due to emulsification The introduction of the agent leads to a reduction in the effective volume of the synthesis reactor and increases the effective volume during injection

Method used

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  • Preparation method of ground surface crosslinking weak jelling particle

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Comparison scheme
Effect test

Embodiment 1

[0023] The molecular weight is 500,000, the concentration is 3000ppm polyacrylamide copolymer solution and 500ppm AlCl 3 Mix in equal volume under shear, PH=6.6, t=30°C, shear time of 30 minutes, and shear rate of 500 rpm. The measured gel particle viscosity is within 10 mPa.s and the elasticity is within 1 Pa. The particle size is a few nanometers to hundreds of nanometers. When the system was placed at 45°C, the viscosity and particle size increased with time, indicating that the gel particles could re-aggregate after being injected.

Embodiment 2

[0025] Molecular weight of 12 million, 8 million, 500,000, concentration of 3000ppm polyacrylamide copolymer solution and 500ppmCrCl 3 Mix in equal volume under shear, PH=6.6, t=30°C, shear time of 30 minutes, and shear rate of 500 rpm. The measured gel particle viscosity is within 10 mPa.s and the elasticity is within 1 Pa. The particle size is a few nanometers to hundreds of nanometers. Explain that these three types of polymers can be compatible with CrCl 3 The reaction forms cross-linked weak gel particles.

[0026] Similarly, the above methods and theories are also applicable under oscillating conditions.

Embodiment 3

[0028] Molecular weight of 12 million, 8 million, 500,000, concentration of 1000ppm polyacrylamide copolymer solution and 300ppmCrCl 3 Mix in equal volume under shaking, PH=6.4, t=30°C, shaking time of 30 minutes, shaking speed of 100-200 rpm, and measuring gel particle viscosity within 10 mPa.s and elasticity within 1 Pa. The particle size is a few nanometers to hundreds of nanometers. It shows that these three types of polymers can interact with CrCl under oscillating conditions. 3 The reaction forms ground-crosslinked weak gel particles.

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Abstract

A process for preparing a novel gel particles with weak surface cross-linking features that when the polymer (or copolymer) solution is mixed with cross-linking agent, the mixture is immediately sheared (or oscillated) at the same time to obtain a uniform suspension of the said weak gel particles. Its advantages are dynamic mixing and cross linking and single water phase as solvent.

Description

Technical field [0001] The present invention is a preparation technology of a new type of gel particles, specifically, a preparation method of ground cross-linked weak gel particles. Background technique: [0002] Gel plugging agents are widely used in oilfield development, especially in water plugging and profile control, and have good application prospects in flood control operations. The existing gel-type cross-linking systems mainly include: bulk gel (BG), colloidal dispersion gel (CDG), and pre-crosslinked gel particles (PG). [0003] The body gel has liquid preparation and construction difficulties, and special liquid preparation and maturation equipment is required; the gel formation in the formation is affected by various factors such as shearing, degradation, salinity, temperature, adsorption and dissolution of the crosslinking agent, etc. The problem of non-crosslinking is easy to occur; colloidal dispersion gels have the shortcomings of limited application range and ar...

Claims

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Application Information

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IPC IPC(8): C08J3/26C08L33/26
Inventor 胡菁华白宝君李良雄刘玉章
Owner PETROCHINA CO LTD