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Decompressing injection-augmenting strengthening waterflooding anti-swelling swelling-reducing drag-reducing active agent

An active agent, expansion and shrinkage technology, applied in the field of cationic surfactants, can solve the problems of low permeability reservoirs with strong heterogeneity, low displacement efficiency, low single well production, etc., to protect the water flooding of oil and gas layers The effect of development, reducing injection water resistance and improving formation permeability

Pending Publication Date: 2020-02-18
山东科兴化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the particularity of low-permeability oil and gas reservoirs, their seepage characteristics are obviously different from those of medium- and high-permeability reservoirs. Fluid seepage in low-permeability porous media has start-up pressure, large seepage resistance, and nonlinear flow. In addition, low-permeability reservoirs have strong heterogeneity and stress sensitivity and other difficulties, resulting in low single-well production, difficulty in stabilizing production, and low displacement efficiency, which greatly increases the difficulty of low-permeability reservoir development

Method used

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  • Decompressing injection-augmenting strengthening waterflooding anti-swelling swelling-reducing drag-reducing active agent

Examples

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Effect test

Embodiment 1

[0032] A pressure-reducing and increasing-injection enhanced water flooding anti-swelling and shrinkage-reducing active agent, comprising 10% of dimethyl allyl ammonium chloride; 6% of organic guanidine compounds, and the organic guanidine compounds are 4% % of guanidine nitrate and 8% of guanidine acetate, the ratio of the two combinations is 1:3.5; the molecular weight is 4 million macromolecular quaternary ammonium salt 7%; the average molecular weight is 0.02% of polyoxyethylene copolymer resin with an average molecular weight of 500,000; inorganic Salt potassium chloride 8%; isopropanol 6%; emulsifier 1%; stabilizer 1%; anion and cation inhibitor 0.8%; the rest is deionized water.

[0033] Its preparation method is as follows, (1) add deionized water in the reaction kettle, start stirring, the rotation speed is 105 rpm, slowly add polyoxyethylene copolymer resin under stirring, and stir for two hours until it is fully dissolved; (2) the reaction kettle The internal temper...

Embodiment 2

[0035] A pressure-reducing and increasing-injection enhanced water flooding anti-swelling and shrinkage-reducing active agent, comprising 25% of dimethyl allyl ammonium chloride; 10% of organic guanidine compounds, and the organic guanidine compounds are 10% The mixture of guanidine nitrate and 12% guanidine acetate, the ratio of the two combinations is 1:4.5; the molecular weight is 6 million macromolecule quaternary ammonium salt 10%; the average molecular weight is 0.05% of polyoxyethylene copolymer resin of 2 million; Inorganic salt potassium chloride 15%; isopropanol 10%; emulsifier 1.8%; stabilizer 2%; anion and cation inhibitor 1.8%; the rest is deionized water.

[0036] Its preparation method is as follows, (1) add deionized water in the reaction kettle, start stirring, the rotation speed is 105 rpm, slowly add polyoxyethylene copolymer resin under stirring, and stir for two hours until it is fully dissolved; (2) the reaction kettle The internal temperature was raised ...

Embodiment 3

[0038] A pressure-reducing and increasing-injection enhanced water flooding anti-swelling, swelling and drag-reducing active agent, comprising 40% of dimethyl allyl ammonium chloride; 15% of organic guanidine compounds, and the organic guanidine compounds are 16% The mixture of guanidine nitrate and 15% guanidine acetate, the ratio of the two combinations is 2.2:2.45; the molecular weight is 8 million macromolecular quaternary ammonium salt 14%; the average molecular weight is 4 million polyoxyethylene copolymer resin 0.08%; inorganic Salt potassium chloride 25%; isopropanol 14%; emulsifier 2.8%; stabilizer 3.5%; anion and cation inhibitor 2.8%; the rest is deionized water.

[0039]Its preparation method is as follows, (1) add deionized water in the reaction kettle, start stirring, the rotation speed is 105 rpm, slowly add polyoxyethylene copolymer resin under stirring, and stir for two hours until it is fully dissolved; (2) the reaction kettle The internal temperature is rais...

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Abstract

The invention discloses a decompressing injection-augmenting strengthening waterflooding anti-swelling swelling-reducing drag-reducing active agent, and mainly relates to the field of cationic surfactants. The decompressing injection-augmenting strengthening waterflooding anti-swelling drag-reducing active agent comprises the following components: dimethylallyl ammonium chloride 2%-45%, an organicguanidine compound 4%-16%, a quaternary ammonium salt 4%-16%, polyoxyethylene copolymer resin 0.01%-0.1%, an inorganic salt potassium chloride 2%-30%, isopropyl alcohol 3%-15%, an emulsifier 0.5%-3%,a stabilizer 0.05%-4%, an anion and cation inhibitor 0.1%-3% and the balance of deionized water. The active agent provided by the invention is injected into an ultra-low-permeability stratum, and after slug treatment, water-swellable clay in the stratum can become insensitive when contacting fresh water again, or a swelling phenomenon of low permeability can be reversed; and meanwhile, water injection resistance can be greatly reduced, and water-sensitive clay minerals become insensitive, so that permeability of the stratum is improved, a macroscopic swelling-reducing effect is exerted, and waterflooding development for oil and gas layers is further protected.

Description

technical field [0001] The invention mainly relates to the field of cationic surfactants, in particular to a pressure-reducing, increasing-injection, and water-flooding anti-swelling, expansion-shrinkage, and resistance-reducing active agent. Background technique [0002] With the discovery of more and more low-permeability oil and gas reservoirs, it is very important to develop advanced, mature, adaptable and supporting reservoir stimulation technologies. Due to the particularity of low-permeability oil and gas reservoirs, their seepage characteristics are obviously different from those of medium- and high-permeability reservoirs. Fluid seepage in low-permeability porous media has start-up pressure, large seepage resistance, and nonlinear flow. In addition, low-permeability reservoirs have strong heterogeneity and stress sensitivity, which lead to low single well production, difficulty in stabilizing production, and low displacement efficiency, which greatly increases the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58
CPCC09K8/58C09K2208/28C09K2208/12
Inventor 杨建峰李振华崔长海
Owner 山东科兴化工有限责任公司
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