Double-draining chemical modifier and application thereof

A chemical modifier and modification technology, applied in chemical instruments and methods, production fluids, drilling compositions, etc., can solve the problems of chaotic flow resistance, low water-flooding recovery rate, and obstruction of crude oil flow, etc.

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In hydrophilic low-permeability rock cores, capillary force is the driving force for oil displacement, but the Jiamin effect produced by clay water absorption and swelling hinders the flow of crude oil in the pores, and the recovery factor is not high compared with neutral wet rock cores; In the core with neutral wetness, the Jamin effect is not significant, and the capillary force decreases due to the hysteresis of wetting, and the water is in a kinetically stable state in the pores, which improves the sweep coefficient of injected water and thus improves the recovery factor. ; In low-permeability oil-wet cores, capillary force is the resistance to oil displacement, and at the same time, due to the capillary force generated by the oil-water interface in the complex pore structure of low-permeability reservoirs, the direction of seepage resistance is confused, and the oil film affects the ultimate recovery. , so that the water flooding recovery is relatively low

Method used

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  • Double-draining chemical modifier and application thereof
  • Double-draining chemical modifier and application thereof
  • Double-draining chemical modifier and application thereof

Examples

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preparation example Construction

[0023] According to the present invention, the modified nano-SiO 2 The preparation method preferably comprises the following steps:

[0024] γ-(methacryloyloxy)propyltrimethoxysilane, second organic solvent, nano-SiO 2 Mix well, filter and dry at high temperature.

[0025] Preferably, the concentration of the γ-(methacryloyloxy)propyltrimethoxysilane in the second organic solvent is 1-2mol / L; the γ-(methacryloyloxy)propyltrimethoxysilane Oxysilane and nano-SiO 2 The weight ratio is 2-5:1; the second organic solvent is at least one of acetone, butanone, pentanone and hexanone, more preferably acetone.

[0026] The uniform mixing conditions are, for example, stirring, ultrasonication, and the like.

[0027] The conditions for the high-temperature drying may include: the temperature is 180-200° C., and the time is 4-6 hours.

[0028] The amphiphobic chemical modifier of the invention can be used to improve the liquid-phase seepage capacity of rock cores, thereby increasing t...

Embodiment 1

[0034] Take 4.5g of γ-(methacryloyloxy)propyltrimethoxysilane (AH-570) and add it to the acetone solution, the concentration of AH-570 is 1.5mol / L, add 1.5g of nano-SiO 2 (particle size 30nm), stir well, ultrasonically disperse evenly, filter, dry in a high-temperature oven at 200°C for 4 hours, take it out and cool it for later use. in N 2 Under protection, take 3.6g of 4-perfluoro(2-isopropyl-1,3-dimethyl-1-butenyl)oxystyrene (FOSt) into a three-necked flask, add butanone, and then add 1.2 g modified nano-SiO 2 Carry out surface grafting, stir for 1 hour, heat up to 60°C, add azobisisobutyronitrile, and keep warm at 60°C for 36 hours to realize the purpose of introducing low surface energy substances and changing the surface microstructure, and obtain a chemically modified surface with hydrophobic and oleophobic properties. Agent A.

Embodiment 2

[0036] Take 3g of γ-(methacryloyloxy)propyltrimethoxysilane (AH-570) and add it to the acetone solution, the concentration of AH-570 is 1mol / L, add 1.5g of nano-SiO 2 (particle size 40nm), stir well, ultrasonically disperse evenly, filter, dry in a high-temperature oven at 180°C for 6 hours, take it out and cool it for later use. in N 2 Under protection, take 2.4g of 4-perfluoro(2-isopropyl-1,3-dimethyl-1-butenyl)oxystyrene (FOSt) into a three-necked flask, add butanone, and then add 1.2 g modified nano-SiO 2Carry out surface grafting, stir for 1.5h, heat up to 70°C, add azobisisobutyronitrile, and keep warm at 70°C for 42h to realize the purpose of introducing low surface energy substances and changing the surface microstructure, and obtain a hydrophobic and oleophobic Chemical Modifier B.

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Abstract

The invention relates to a double-draining chemical modifier and application thereof. A method for preparing the double-draining chemical modifier includes steps of mixing gamma-(methacrylamide acyloxy) propyl trimethoxy silane modified nanometer SiO2 and 4-total fluorine (2-isopropyl-1, 3-dimethyl-1-butenyl) oxygen styrene with each other in the presence of inert gas and first organic solvents to obtain mixtures; adding initiators into the mixtures and carrying out surface grafting reaction to obtain the double-draining chemical modifier. The double-draining chemical modifier and the application have the advantages that the surfaces of pores of cores are modified to have water-draining and oil-draining characteristics after the low-permeability sandstone cores are treated by the double-draining chemical modifier which is a chemical agent, seepage resistance of water phases and oil phases can be simultaneously reduced, the seepage capacity of the low-permeability cores can be improved, and the oil and water permeability of the low-permeability sandstone cores can be improved by 50% at least as shown by indoor experiments.

Description

technical field [0001] The invention belongs to the field of petroleum development, and in particular relates to an amphobic chemical modifier and the use of the amphobic chemical modifier in improving the oil-water permeability of sandstone reservoirs. Background technique [0002] The role of low-permeability oilfield development in the sustainable development of my country's petroleum industry is becoming more and more important. The scientific research, technical breakthroughs and field tests of low-permeability oilfield development have been included in the national key projects and major projects of several major oil group companies. Reservoir recovery is particularly urgent. For the development of low-permeability reservoirs, the wettability (hydrophilic, lipophilic, weakly hydrophilic, strong hydrophilic, etc.) and charging properties of reservoir rocks, the physical properties of crude oil (viscosity, density, composition, etc.), The interfacial tension between wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F212/14C09K8/588E21B43/22
Inventor 吕成远卢刚王友启潘伟义陈少华贾红育王海涛周霞
Owner CHINA PETROLEUM & CHEM CORP
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