Temperature-resistant salt-resistant heterogeneous nano-composite oil displacement system as well as preparation method and application thereof

A nano-composite, temperature-resistant and salt-resistant technology, applied in chemical instruments and methods, silicon-organic compounds, drilling compositions, etc. The problems of poor salt tolerance and low permeability can achieve the effect of excellent imbibition oil recovery performance, improving suspension performance, and promoting the speed of particle settling.

Active Publication Date: 2021-08-24
山东聚星石油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by its own molecular structure, petroleum sulfonate has poor salt resistance, and non-ionic surfactant GD-3 has poor temperature resistance
In addition, a PPG, polymer and surfactant heterogeneous composite flooding system was also disclosed (Cui Xiaohong, "New Heterogeneous Composite Oil Flooding Method" [J], Acta Petroleum Sinica, 2011), but due to the traditional viscoelastic The particle size of the granular oil displacement agent PPG after absorbing water and swelling is much larger than the pre-crosslinked gel particles. Therefore, it is difficult for the heterogeneous composite oil displacement system formed by the viscoelastic granular oil displacement agent PPG to enter the lower permeability formation to play a role

Method used

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  • Temperature-resistant salt-resistant heterogeneous nano-composite oil displacement system as well as preparation method and application thereof
  • Temperature-resistant salt-resistant heterogeneous nano-composite oil displacement system as well as preparation method and application thereof
  • Temperature-resistant salt-resistant heterogeneous nano-composite oil displacement system as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Weigh the required surfactant and nano-SiO 2 The aqueous dispersion is made into a nano-osmotic agent solution with a concentration of 1.2%;

[0092] Accurately weigh 1.1071g instant polymer sample (R 3 = Re, R 4 =-CH 3 , n=35000), weighed 198.8929g of simulated brine in a 500mL beaker, started the constant speed stirrer and slowly added the sample along the vortex wall at (400±20)r / min for 30s, then stirred at a rate of (700 After stirring for 1 h at ±20) r / min, the concentration of the resulting solution was 5000 mg / L. After standing for 24 hours, stir slightly with a glass rod and then dilute the solution to a concentration of 2000mg / L;

[0093] Accurately weigh 5.5036g of pre-crosslinked gel particle samples, weigh 994.4964g of simulated saline in a 1000mL jar, turn on the constant speed stirrer and slowly add the sample along the vortex wall at (400±20)r / min for 30s. Sample, then stirred at a stirring rate of (500±20) r / min for 2 hours, the concentration of th...

Embodiment 2

[0097] Weigh the required surfactant and nano-SiO 2 The aqueous dispersion is made into a nano-osmotic agent solution with a concentration of 1.25%;

[0098] Accurately weigh 1.1049g instant polymer sample (R 3 = Mo, R 4 =-CH 2 CH 2 CH 2 CH 3 , n=43000), weighed 198.8951g simulated brine in a 500mL beaker, started the constant speed stirrer and slowly added the sample along the vortex wall at (400±20)r / min for 30s, then stirred at a rate of (700 After stirring for 1 hour at ±20) r / min, the concentration of the resulting solution is 5000 mg / L;

[0099] Accurately weigh 5.4867g of pre-crosslinked gel particle samples, weigh 994.5133g of simulated saline into a 1000mL jar, turn on the constant speed stirrer and slowly add the sample along the vortex wall at (400±20)r / min within 30s. Sample, then stirred at a stirring rate of (500±20) r / min for 2h, the concentration of the resulting solution was 5000mg / L, slightly stirred with a glass rod and then diluted to a concentration...

Embodiment 3

[0103] Weigh the required surfactant and nano-SiO 2 The aqueous dispersion is made into a nano-osmotic agent solution with a concentration of 3.0%;

[0104] Accurately weigh 1.1029g instant polymer sample (R 3 = Re, R 4 =-CH 2 CH 3 , n=40000), weighed 198.8971g of simulated brine in a 500mL beaker, started the constant speed stirrer and slowly added the sample along the vortex wall at (400±20)r / min for 30s, then stirred at a rate of (700 After stirring for 1 h at ±20) r / min, the concentration of the obtained solution was 5000 mg / L, and after stirring slightly with a glass rod, the concentration of the solution was diluted to 4000 mg / L.

[0105] Accurately weigh 5.4831g of pre-crosslinked gel particle samples, weigh 994.5169g of simulated saline into a 1000mL jar, turn on the constant speed stirrer and slowly add the sample along the vortex wall at (400±20)r / min within 30s. Sample, then stirred at a stirring rate of (500±20) r / min for 2 hours, the concentration of the obta...

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Abstract

The invention provides a temperature-resistant salt-resistant nano heterogeneous composite oil displacement system as well as a preparation method and application thereof, and belongs to the technical field of oil exploitation, transportation and chemical engineering. The temperature-resistant salt-resistant nano heterogeneous composite oil displacement system provided by the invention is formed by compounding pre-crosslinked gel particles, an instant polymer and a nano imbibition agent step by step, has higher viscosity and viscoelasticity under the conditions that the temperature is less than or equal to 90 DEG C and the total mineralization degree is less than or equal to 32868mg / L, and can deeply penetrate into a stratum with the permeability of less than or equal to 50*10<-3> [mu]m<2> to play an oil displacement role.

Description

technical field [0001] The invention belongs to the technical fields of petroleum exploitation, transportation and chemical industry, and relates to a temperature-resistant and salt-resistant heterogeneous nanocomposite oil flooding system, a preparation method and application thereof. Background technique [0002] The low-permeability oilfields discovered in my country account for more than half of the newly discovered oil reservoirs, and the scale of production capacity construction of low-permeability oilfields accounts for more than 70% of the total scale of oilfield production capacity construction. Low-permeability oilfields have become the main battlefield for oilfield development and construction. The most basic characteristics of low-permeability oilfields are poor fluid permeability and low productivity. The average recovery rate of low-permeability oilfields in my country is only 21.4%. [0003] Pre-crossed gel particles are a new type of deep liquid flow divertin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/588C09K8/60C09K8/512C09K8/88C07F7/08
CPCC09K8/584C09K8/588C09K2208/10C09K8/602C09K8/512C09K8/5083C09K8/887C09K8/882C07F7/0812
Inventor 齐书磊李慎伟杨姗陈海燕姚勇杨军陈文锋杜河新
Owner 山东聚星石油科技有限公司
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