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Preparation method of simulated oil in indoor oil displacement experiment and application thereof

A technology of experimental simulation and oil simulation, which is applied in the direction of educational appliances, teaching models, instruments, etc., can solve the problems affecting the experimental results, etc., and achieve the effect of simple raw materials, simple and easy preparation process, and stable performance

Inactive Publication Date: 2011-05-25
SICHUAN GUANGYA POLYMER CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, most water injection development oilfields need to add various chemical additives during the water injection process, and they will be partially dissolved in the crude oil, which is likely to have adverse reactions with the displacement fluid during the oil displacement experiment and affect the experimental results

Method used

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  • Preparation method of simulated oil in indoor oil displacement experiment and application thereof
  • Preparation method of simulated oil in indoor oil displacement experiment and application thereof
  • Preparation method of simulated oil in indoor oil displacement experiment and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] [Example 1] Preparation of simulated oil

[0010] Accurately measure 3500mLPAO base oil A (viscosity 140mPa·s at 65°C) in a 1L beaker, and then measure 1500mLPAO base oil B (viscosity 20mPa·s at 65°C) and slowly transfer it to the beaker with a glass rod. Place the beaker in a 65°C water bath, and slowly add 2g of the thickener dropwise. If the thickener has poor fluidity, let it stand for 2 hours in a 65°C water bath before dropping. The prepared simulated oil was placed in a 65°C water bath for 1 hour, during which it was slowly stirred with a glass rod to prevent local overheating. Then, under a constant temperature of 65°C, mechanical stirring was performed at a speed of 120 rpm for 1.5 hours. The final viscosity was 78mPa·s. After being placed in a thermostat at 80°C for 96 hours, the viscosity change rate was 1%.

Embodiment 2

[0011] [Example 2] Preparation of simulated oil

[0012] Accurately measure 4000mLPAO base oil B (viscosity at 65°C: 140mPa·s) in a 1L beaker, and then measure 1000mLPAO base oil B (viscosity at 65°C: 20mPa·s) and slowly transfer to the beaker with a glass rod. Place the beaker in a 65°C water bath, and slowly add 1g of the viscosity increasing agent dropwise. If the viscosity increaser has poor fluidity, let it stand for 2 hours in a 65°C water bath before dropping it. The prepared simulated oil was placed in a 65°C water bath for 1 hour, during which it was slowly stirred with a glass rod to prevent local overheating. Then mechanical stirring was carried out at a constant temperature of 65°C for 2 hours at a speed of 150 rpm. The final viscosity was 80.5mPa·s. After being placed in a thermostat at 80°C for 96 hours, the viscosity change rate was 1.5%.

Embodiment 3

[0013] [Example 3] Application of simulated oil to flooding experiment of sand pack pipe

[0014] The injection water used in the water flooding experiment is simulated formation water (total salinity is about 10000mg / L), and the polymer used in the polymer flooding experiment is the hydrophobic associating polymer P(AM-NaAA-C 16 DMAAC), the concentration is 1750mg / L. The simulated oil used has a viscosity of 78mPa·s at 65°C. Sand filling pipe size: diameter 2.5cm, length 55cm. During the whole experiment, the temperature of the thermostat and pipe fittings was 65℃. The core parameters and oil displacement efficiency are as follows: (Among them, the simulated oil saturation is used to represent the percentage of simulated oil in the pores of the reservoir rock; the water drive efficiency represents the amount of oil recovered from the unit pore volume swept by the injected water divided by The oil reserves per unit volume affected by water at the beginning of water injection; p...

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Abstract

The invention relates to a preparation method of simulated oil used in an indoor oil displacement experiment during oil production teaching and research, and an application thereof. Crude oil can be replaced by the simulated oil for an indoor sand-packed tube oil displacement. The technical scheme comprises the following steps: mixing poly alpha-olefin (PAO) base oil A (viscosity coefficient thereof is 140 mPa*s at the temperature of lower than 65 DEG C) with PAO base oil B (viscosity coefficient thereof is 20 mPa*s at the temperature of lower than 65 DEG C) according to a proportion of 70-80: 30:20 to prepare primary simulated oil; wherein the mixing method is as follows: adding the base oil B with lower viscosity coefficient to the base oil A with higher viscosity coefficient; then adding 1-5g of tackifier into 1000mL of primary simulated oil; and finally mechanically stirring the prepared model oil for 1-2 hours at the temperature of 65 DEG C after the prepared simulated oil is placed in a water bath kettle, thereby obtaining the simulated oil for the experiment. The simulated oil has water displacement efficiency and polymer displacement efficiency similar to the crude oil, and realizes stable performance and good experiment repetitiveness; and the simulated oil is applicable to the sand-packed tube oil displacement experiment during the oil production teaching and scientific research.

Description

Technical field [0001] The invention relates to a preparation method and application of an indoor flooding experiment simulated oil used in the fields of petroleum exploitation teaching experiment and petroleum exploitation research experiment. Background technique [0002] The core flooding experiment is a basic method in the teaching and technical research of petroleum exploitation. It involves the flooding effect of various oil displacement working fluids in water injection development and chemical flooding enhanced oil recovery technology under different conditions. In the process of obtaining crude oil from actual production wells, due to pressure and temperature changes, the overflow of dissolved gas in the crude oil and the volatilization of light components make the viscosity higher than that in the ground, which has to be used in core flooding experiments. The method of adding thin oil to simulate the underground viscosity of crude oil results in poor repeatability of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09B25/02
Inventor 张瑞叶仲斌唐克施雷庭郭智栋
Owner SICHUAN GUANGYA POLYMER CHEM
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