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Preparation method and application of hyperbranched polyacrylamide nano-microspheres for profile control and displacement of low-porosity and low-permeability oil reservoirs

A polyacrylamide and nano-microsphere technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of unsatisfactory effect of deep regulation and flooding in low-permeability oil reservoirs, unstable linear molecular chain structure, and shear resistance. Poor performance and other problems, to achieve the effect of improving the development effect of water injection, bright development prospects and economic benefits, and not easy to fracture and deform

Active Publication Date: 2021-10-22
ANHUI TIANRUN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at present, polyacrylamide microspheres are mostly polymerized by acrylamide monomers and anionic monomers or cationic monomers. The elastic modulus is reduced and the shear resistance is poor; at the same time, due to the long molecular weight of linear linear polymers, the size of linear polymer microspheres is generally 70nm to 100μm. In the research and development of smaller-sized nano-polymer microspheres Blocked, not ideal for deep control and flooding in low permeability reservoirs

Method used

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  • Preparation method and application of hyperbranched polyacrylamide nano-microspheres for profile control and displacement of low-porosity and low-permeability oil reservoirs
  • Preparation method and application of hyperbranched polyacrylamide nano-microspheres for profile control and displacement of low-porosity and low-permeability oil reservoirs
  • Preparation method and application of hyperbranched polyacrylamide nano-microspheres for profile control and displacement of low-porosity and low-permeability oil reservoirs

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preparation example Construction

[0034] This example provides a method for preparing hyperbranched polyacrylamide nanospheres for control and flooding of low-porosity and low-permeability reservoirs. The hyperbranched polyacrylamide nanospheres use mellitic acid as a rigid structure branching Phase emulsion polymerization method, formed by copolymerization with diallylamine, acrylamide, anionic unsaturated monomer, N,N-methylenebisacrylamide, specifically including the following steps:

[0035] (1) Material preparation: Weigh 3-5 parts of mellitic acid, 4-6 parts of diallylamine, 20-30 parts of acrylamide, 8-12 parts of anionic unsaturated monomer, N,N- 0.1-0.5 parts of methylenebisacrylamide, 50-75 parts of deionized water, 0.05-0.3 parts of EDC·HCl, 0.05-0.3 parts of complexing agent, 0.05-0.3 parts of stabilizer, 0.03-0.15 parts of cross-linking agent, 0.06-0.3 parts of oxidizing agent, 30-90 parts of emulsifier, 80-180 parts of oil-soluble solvent, 12-20 parts of reducing agent solution; the mass concentr...

Embodiment 1

[0049] (1) Material preparation: Weigh 4.2g of mellitic acid, 4.7g of diallylamine, 25.2g of acrylamide, 10.8g of acrylic acid, 0.1g of N,N-methylenebisacrylamide, 55g of deionized water, EDC ·HCl 0.065g, sodium ethylenediamine tetramethylene phosphate 0.065g, polyvinylpyrrolidone 0.065g, pentaerythritol triacrylate 0.045g, sodium persulfate 0.13g, kerosene 110g, 40g span80+13.35g tween80, mass concentration 5% 16g of sodium bisulfite solution;

[0050] (2) Prepare the water phase:

[0051] a. Add mellitic acid, acrylamide, acrylic acid, and N,N-methylenebisacrylamide into deionized water, stir and dissolve at 50°C, then add diallylamine, and stir evenly to obtain an aqueous monomer solution;

[0052] b. Add EDC·HCl to the monomer aqueous solution, stir in a constant temperature water bath at 50°C for 0.5h, carry out pre-condensation acylation reaction, then adjust the pH to 7.0, and then add sodium ethylenediamine tetramethylene phosphate and polyvinylpyrrolidone to it in se...

Embodiment 2

[0066] Same as Example 1, except that 0.1g of N,N-methylenebisacrylamide is replaced by 0.05g of N,N-methylenebisacrylamide.

[0067] Expansion multiple test: Weigh 0.162g of hyperbranched polyacrylamide nanospheres into an 80-mesh nylon mesh filter bag, and completely immerse it in 250mL of 70°C high-temperature water; 0.169g of hyperbranched polyacrylamide nanospheres into 80-mesh nylon mesh filter bag, and completely immerse it in 250mL of 10000mg / L salinity solution; 0.105g hyperbranched polyacrylamide nano-microspheres are packed into 80-mesh nylon mesh filter bag, and completely immerse it in 250mL 1000mg / L calcium magnesium solution;

[0068] After 48 hours, the filter bag was taken out, and excess water on the surface of the microspheres was wiped off with filter paper, and the masses were said to be 12.078g, 4.874g, and 2.763g, respectively.

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Abstract

The invention discloses a preparation method and application of hyperbranched polyacrylamide nano-microspheres for profile control and displacement of low-porosity and low-permeability oil reservoirs, wherein benzenehexacarboxylic acid is used as a rigid structure branching agent, an inverse emulsion polymerization method is adopted, and copolymerization with dialkylamine, acrylamide, an anionic unsaturated monomer and N, N-methylene bisacrylamide is carried out to form the hyperbranched polyacrylamide nano-microspheres. The particle size distribution of the nano-microsphere is 10-60 nm, the expansion multiple is larger than 15 times under the high-temperature and high-salt conditions, meanwhile, the stability reaches 12 months, meanwhile, the nano-microsphere can expand under the high-temperature and high-salt conditions, and aiming at the characteristics of low-porosity and low-permeability oil reservoirs, the polyacrylamide nano-microspheres have good development prospects and economic benefits in the field of development of low-porosity and low-permeability oil reservoirs.

Description

technical field [0001] The invention belongs to, and in particular relates to a preparation method and application of hyperbranched polyacrylamide nano-microspheres for regulating and driving in low-porosity and low-permeability oil reservoirs. Background technique [0002] At present, most oilfields in my country have entered the late stage of development, especially in the central and western oilfields, where the proportion of low-permeability reservoirs is very high. Most of the reservoirs are low-porosity and low-permeability reservoirs with fracture development. In addition, most of the reservoirs are high-temperature and high-salt types. . For low-porosity and low-permeability reservoirs, the most important characteristics of good profile control and water plugging materials are that they can be injected and blocked. Injection requires the material to exist stably in water, and the initial size of the material must be smaller than that of the formation. The diameter of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F226/04C08F222/38C08F222/20C08F8/00C08F222/02C08F226/02C08F2/32C09K8/588C09K8/512C09K8/516
CPCC08F220/56C08F2/32C08F8/00C09K8/588C09K8/512C09K8/5083C09K8/516C08F220/06C08F226/04C08F222/385C08F222/104C08F222/02C08F226/02
Inventor 刘彭城李杰陈建波汪艳张传银乔磊磊张弓
Owner ANHUI TIANRUN CHEM CO LTD
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