Oil displacement system for improving recovery factor after polyalcohol drive and preparation method thereof

A polymer and recovery technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of large dosage, poor resistance to inorganic high-valent cations, etc., and achieve low cost, ultra-low interfacial tension, and improved The effect of recovery factor

Inactive Publication Date: 2008-09-24
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the prior art, such as poor high-temperature resistance and high-valent inorganic cation resistance and large dosage, the present invention provides a novel oil displacement system for further enhanci

Method used

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  • Oil displacement system for improving recovery factor after polyalcohol drive and preparation method thereof
  • Oil displacement system for improving recovery factor after polyalcohol drive and preparation method thereof
  • Oil displacement system for improving recovery factor after polyalcohol drive and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Example 1: Oil displacement system for enhanced oil recovery after polymer flooding

[0040] Raw materials: 17.0g of hydrolyzed polyacrylamide, 7.5g of isooctylphenol polyoxyethylene ether (Triton X-100), 2.5g of cetyltrimethylammonium bromide, 46.3g of sodium chloride, 1.52g of calcium chloride g, magnesium chloride 2.18g, purified water 9923g.

[0041] Add the above raw materials into a mixer with a stirring device, and stir at room temperature for 1-2 hours.

[0042] At a temperature of 70°C and a shear rate of 7s -1 The measured viscosity of the system was 13.2mPa·s, and the lowest interfacial tension was 2.8×10 -3 mN·m -1 ; After being adsorbed three times by quartz sand and formation sand (the mass ratio of adsorbent to adsorbate is 1:3), the viscosities of the system are 29.6 and 15.8 mPa s, respectively, and the lowest interfacial tension is 4.8×10 -3 mN·m -1 , 3.0×10 -3 mN·m -1 .

Embodiment 2

[0043] Example 2: Oil displacement system for enhanced oil recovery after polymer flooding

[0044] Raw materials: 17.0g of hydrolyzed polyacrylamide, 7.5g of isooctylphenol polyoxyethylene ether (Triton X-100), 2.5g of cetyltrimethylammonium bromide, and 9973g of formation water from Gudao Oil Production Plant of Shengli Oilfield.

[0045] Add the above raw materials into a mixer with a stirring device, and stir at room temperature for 1-2 hours.

[0046] At a temperature of 70°C and a shear rate of 7s -1 The measured viscosity of the system was 16.5mPa·s, and the lowest interfacial tension was 4.6×10 -3 mN / m; after being adsorbed three times by quartz sand and formation sand (the mass ratio of adsorbent to adsorbate is 1:3), the viscosities of the system are 48.1 and 25.3 mPa s, respectively, and the lowest interfacial tension is 8.3×10 -3 mN·m -1 , 6.4×10 -4 mN·m -1 .

Embodiment 3

[0047] Example 3: Oil displacement system for enhanced oil recovery after polymer flooding

[0048] Raw materials: 17.0g of hydrolyzed polyacrylamide, 3.0g of xanthan gum, 7.5g of polyethylene glycol octylphenyl ether (OP-6), 2.5g of cetyltrimethylammonium bromide, 46.3g of sodium chloride , calcium chloride 1.52g, magnesium chloride 2.18g, purified water 9920g.

[0049] Add the above raw materials into a mixer with a stirring device, and stir at room temperature for 1-2 hours.

[0050] At a temperature of 70°C and a shear rate of 7s -1 The measured viscosity of the system was 12.7mPa·s and the lowest interfacial tension was 1.3×10 -3 mN·m -1 ; After being adsorbed three times by quartz sand and formation sand (the mass ratio of adsorbent to adsorbate is 1:3), the viscosities of the system are 31.4 and 19.0 mPa s, respectively, and the lowest interfacial tension is 1.2×10 -3 mN·m -1 , 3.2×10 -3 mN·m -1 .

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Abstract

The invention relates to a flooding system used for improving the recovery factor after polymer flooding and a preparation method thereof, which belongs to the technical field of enhanced recovery of oil fields. A surfactant with unlike charges and a polymer react with each other to produce a high-activity compound; and the high-activity compound is mixed with a non-ionic surfactant to produce the novel flooding system. The novel flooding system solves the problems of the poor temperature resistance and the inorganic high valence cation resistance of the prior flooding system. The novel flooding system has the advantages of high viscocity, ultra-low interfacial tension, low feeding quantity and so on. The system has wide application prospects in oil fields to apply the technology for improving the oil recovery factor.

Description

technical field [0001] The invention relates to a novel oil flooding system for further enhancing recovery after polymer flooding and a preparation method thereof, and belongs to the technical field of oil field enhanced oil recovery. Background technique [0002] With the continuous development of oil extraction, oil fields in many regions of the world have entered the stage of high water cut in the later stage of development. At present, the oil displacement methods that can effectively improve the recovery factor of old oilfields and increase the recoverable content include: alkaline water flooding, polymer flooding, surfactant flooding (active water flooding, micellar flooding and microemulsion flooding) and three-phase flooding. Elementary compound flooding (alkali-polymer-surfactant). Among them, ASP flooding is developed on the basis of alkaline water flooding and polymer flooding. It is characterized by low cost and can significantly increase oil recovery, but the l...

Claims

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Application Information

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IPC IPC(8): C09K8/584
Inventor 徐桂英宫厚健吴丹朱艳艳辛霞李一鸣汪庐山
Owner SHANDONG UNIV
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