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Biological oil-displacing agent welan gum and oil-displacing system thereof

A technology of biological flooding and welan gum, applied in the direction of microorganisms, methods based on microorganisms, biochemical equipment and methods, etc., to achieve the effects of simple preparation process, reduced dosage and cost saving

Active Publication Date: 2019-07-30
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on welan gum as an oil displacement agent and its mature system

Method used

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  • Biological oil-displacing agent welan gum and oil-displacing system thereof
  • Biological oil-displacing agent welan gum and oil-displacing system thereof
  • Biological oil-displacing agent welan gum and oil-displacing system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1 welan gum fermentation liquid flooding system

[0040] Inoculate the frozen sphingomonas Sphingomonas sp.WG with the preservation number M2013161 in the primary seed medium, and cultivate it at 30°C and 150r / min for 16-24 hours to obtain the primary seed liquid; According to the volume ratio of 1: (15-20) the inoculum is inoculated into the secondary seed medium, and cultivated at 30°C and 150r / min for 16-18 hours to obtain the secondary seed liquid. Inoculate the secondary seed liquid into 20 times the volume of fermentation medium, and cultivate it at 30°C and 150r / min for 24-72 hours to obtain a welan gum fermentation liquid; wherein, the primary seed medium and the secondary seed culture The base is a medium containing 8-12g / L sucrose, 0.5-1g / L yeast extract, 2-8g / L peptone, 1-2g / L potassium dihydrogen phosphate and 0.5-1g / L magnesium sulfate; fermentation culture The base is a culture medium containing 60-80g / L sucrose, 2-5g / L yeast extract, 2-5g / L di...

Embodiment 2

[0046] Embodiment 2 welan gum aqueous solution flooding system

[0047] The fermented liquid of Welan gum obtained in Example 1 was processed through alcohol precipitation and dried for 24-72 hours to obtain the crude product Welan gum; the crude product Welan gum was used in isopropanol / sodium chloride system (the concentration of sodium chloride 2-5%), further purified, dried for 24-72 hours, and ground into powder to obtain the biological oil displacement agent welan gum.

[0048] Prepare the obtained bio-displacing agent welan gum into an aqueous solution with a concentration of 0.03-0.05%, stir evenly in a water bath at 35-40°C, let it stand overnight at room temperature, and use a six-speed rotary viscometer to measure the viscosity in the range of 25-100mPa Between .s, the welan gum aqueous solution flooding system was obtained and stored at 4°C.

[0049] Using the displacement simulation experiment as described in Example 1, the sand-packed pipe has a permeability of ...

Embodiment 3

[0051] Example 3 Welan gum fermentation broth-polymer compound oil displacement system

[0052] After diluting the welan gum fermentation liquid obtained in Example 1 by 2-5 times, polyacrylamide was added to the welan gum fermentation liquid until the polyacrylamide concentration reached 0.05%, and the viscosity range measured by a six-speed rotational viscometer was 120- 200mPa.s to obtain the welan gum fermentation broth-polymer compound oil displacement system, which was stored at 4°C.

[0053] Using the displacement simulation experiment as described in Example 1, the sand-packed pipe has a permeability of 3709mD and an oil-bearing volume of 138cm 3 , with a pore volume of 177cm 3 , the porosity is 35.7%. The simulated oil sample is mixed oil, the composition of which is crude oil: neutral kerosene = 1:1, and the viscosity is 300mPa.s.

[0054] A total of 3.2PV of displacement fluid was measured, including 1.6PV for water flooding and 1.6PV for chemical flooding. disp...

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Abstract

The invention provides a biological oil-displacing agent welan gum and an oil-displacing system thereof, and belongs to the technical field of tertiary oil recovery. The biological oil-displacing agent welan gum is free of toxicity, harmless and easy to degrade, and is an environment-friendly biological agent, and the oil-displacing capacity is equivalent to that of a polymer. When the solution ofthe biological oil-displacing agent welan gum is used in an oil-displacing system, the preparation process is simple, the cost is low, and large-scale production and application are facilitated. According to the technical scheme, the preparation process comprises the step of preparation of welan gum fermentation liquid and the step of preparation of the biological oil-displacing agent welan gum.The biological oil-displacing agent welan gum can be used in petroleum recovery under high-temperature and high-salinity reservoir conditions.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, in particular to a biological oil displacement agent welan gum and its oil displacement system. Background technique [0002] With the continuous improvement of exploration and development technology, the proven reserves of low-permeability oil and gas reservoirs have accounted for 60%-70% of my country's newly added proven reserves. Low-permeability-ultra-low-permeability oil and gas reservoirs, ultra-low permeability oil and gas reservoirs, unconventional oil and gas resources, deep high-temperature and offshore oil have become "difficult" fields to be developed and utilized. Require. Therefore, it is in line with the development direction of my country's petroleum industry to develop biopolymer oil displacement agents suitable for high temperature and high salinity reservoir conditions, low damage, low cost, high efficiency and environmental protection. [0003] Currently widel...

Claims

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Application Information

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IPC IPC(8): C09K8/588C09K8/88E21B43/22C12P19/04C12R1/01
CPCC09K8/588C09K8/882C09K8/885C12P19/04E21B43/16
Inventor 姬思雪王继乾李慧朱虎徐海鹿腾
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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