Hydrophobically associating hydroxyethylcellulose oil displacement agent

A technology of synthesizing hydroxyethyl and cellulose, which is applied in drilling compositions, production fluids, wellbore/well components, etc., can solve the problems of difficulty in degradation, high toxicity, large influence of temperature and inorganic salts, etc. Contamination, good viscosity increase and viscoelasticity, effect of improving sweep coefficient

Active Publication Date: 2011-08-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the defects and deficiencies of oil displacement polymers commonly used in oilfields, such as being greatly affected by temperature and inorganic salts, difficult to degrade, and highly toxic during production and application, the present invention provides

Method used

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  • Hydrophobically associating hydroxyethylcellulose oil displacement agent
  • Hydrophobically associating hydroxyethylcellulose oil displacement agent
  • Hydrophobically associating hydroxyethylcellulose oil displacement agent

Examples

Experimental program
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Embodiment 1

[0039] A hydrophobic association hydroxyethyl cellulose oil displacing agent, the hydrophobic association hydroxyethyl cellulose is C12-hydrophobic association hydroxyethyl cellulose, R is -C in formula I 12 h 25 structural unit. The molecular weight of the hydrophobically associated hydroxyethyl cellulose is 1 million to 1.5 million.

[0040] Synthesis of Hydrophobically Associated Hydroxyethyl Cellulose: Put 6.6g of HEC into a three-neck flask, add 38mL of isopropanol (IPA), stir at room temperature, pass nitrogen gas for 0.5h, and slowly add 35mL of NaOH aqueous solution with a concentration of 3.0wt%. After swelling at room temperature for 24 hours, the temperature was raised to 80°C, and bromododecane-isopropanol solution (bromododecane 2.4mL dissolved in 5mL isopropanol) was slowly added dropwise, and nitrogen gas was introduced again for 0.5h. React at the temperature of 80°C for 6h; decant the product, filter the resulting product, wash the solid once with n-hexane, ...

Embodiment 2

[0043] Embodiment 2: application experiment

[0044] Experimental conditions: homogeneous core, length: 30cm, cross-sectional area: 4.676cm 2 , the core permeability is 1.809μm 2 .

[0045] Crude oil: Liaohe crude oil, the apparent viscosity is 326mPa·s at 25°C.

[0046] Experimental temperature: 25°C.

[0047] Experimental method: Water flooding to a water content of above 98% + 0.5PV of a C12-hydrophobic association hydroxyethyl cellulose aqueous solution with a concentration of 4000mg / L, followed by water flooding to a water content of above 98%.

[0048] Oil flooding results: the water flooding recovery rate is 35.9%, and the enhanced oil recovery rate is 18.4%.

Embodiment 3

[0049] Embodiment 3: As described in Embodiment 2, the difference is:

[0050] The core permeability is 1.822μm 2 , The concentration of C12-hydrophobic association hydroxyethyl cellulose aqueous solution is 5000mg / L.

[0051] Oil flooding results: the water flooding recovery rate is 35.1%, and the enhanced oil recovery rate is 26.3%.

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Abstract

The invention relates to a hydrophobically associating hydroxyethylcellulose oil displacement agent. The hydrophobically associating hydroxyethylcellulose has the constitutional unit shown in the formula I. In the formula I, R is -C12H25, -C14H29 or -C16H33. The hydrophobically associating hydroxyethylcellulose is used to prepare 2000-8000mg/L of solution and the solution is injected in formationor core so as to increase the oil recovery. In the oil displacement agent, the modified natural polymer-hydrophobically associating hydroxyethylcellulose is used to replace the refractory polyacrylamide oil displacement agent with potential toxicity.

Description

technical field [0001] The invention relates to the technical field of oil displacement agents, in particular to a hydrophobic association hydroxyethyl cellulose oil displacement agent for enhancing crude oil recovery. Background technique [0002] The crude oil recovery rate refers to the percentage of the accumulatively produced oil volume of the oilfield to the geological reserves of the oilfield, that is, the ratio of the recovered crude oil volume to the original underground oil storage volume. With the development of oilfield development technology, many effective methods of enhancing oil recovery have appeared one after another. In the initial stage of oil field development, primary oil recovery and secondary oil recovery are usually used for recovery. Primary oil recovery refers to the recovery of oil by using the original energy of the oil layer, such as solution gas drive and gas cap drive. Secondary oil recovery is the method of maintaining formation pressure, s...

Claims

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Application Information

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IPC IPC(8): C09K8/588E21B43/22
Inventor 王彦玲仇东旭蒋官澄赵修太马莉徐超金家锋郑晶晶
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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