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Composite oil displacement agent

A technology for compound flooding and chemical compounds, applied in drilling compositions, chemical instruments and methods, etc., can solve problems of stability, viscosity reduction, viscosity loss, etc.

Active Publication Date: 2011-09-14
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oil displacement polymer AP-P4 is acrylamide, acrylic acid, alkyl dimethyl allyl ammonium chloride copolymer, molecular weight 1.7×10 6 , the degree of hydrolysis is 18.2%, and the content of hydrophobic group is less than 1%. , resulting in viscosity loss
At high temperature, the viscosity of the polymer solution will decrease due to oxidation, thermal damage, etc., thus losing its use value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, the preparation of composite oil displacement agent

[0018] Weigh 0.025g of the above-mentioned prepared glycoluril (abbreviated as gn) and add to 8074mg / L mineralized water containing 500mL (composed of 6408.4mg / L NaCl, 30.37mg / L KCl, 419mg / L CaCl 2 , 324.6mg / L MgCl 2 , 36.98mg / LNa 2 SO 4 , 84.8mg / L Na 2 CO 3 , 769.8mg / L NaHCO 3 and the balance is water), stir until completely dissolved, then weigh 0.875g AP-P4 dry powder and slowly add it to the above-mentioned simulated mineralized water containing glycoluril, stir until completely dissolved to obtain a composite oil displacement agent, wherein, glycoluril The mass volume concentration of AP-P4 is 50mg / L, and the mass volume concentration of AP-P4 is 1750mg / L.

[0019] The obtained composite oil displacement agent was sheared for 20 seconds with the first gear of the WARING agitator to simulate the state of the composite oil displacement agent after the surface injection process and the strong me...

Embodiment 2

[0020] Embodiment 2, the preparation of composite oil displacement agent

[0021] The preparation process is the same as in Example 1, except that the quality of glycoluril (abbreviated as gn) is changed to 0.05g. The mass volume concentration of glycoluril in the prepared composite oil displacement agent was 100 mg / L, and the mass volume concentration of AP-P4 was 1750 mg / L.

[0022] The obtained composite oil displacement agent was sheared for 20 seconds with the first gear of the WARING agitator to simulate the state of the composite oil displacement agent after the surface injection process and the strong mechanical shearing of the bottom hole through the blast hole, and then bubbled with nitrogen and sealed for storage. Yes, then place the composite oil displacement agent in a constant temperature incubator at 65°C for aging, and measure it with a Brookfield DVII viscometer at a shear rate of 7.34S -1 1. The test temperature is the viscosity of the composite oil displace...

Embodiment 3

[0023] Embodiment 3, the preparation of composite oil displacement agent

[0024] Weigh 0.025g of tetramethylol glycoluril (abbreviated as sgn) prepared above and add to 8074mg / L mineralized water containing 500mL (composed of 6408.4mg / L NaCl, 30.37mg / L KCl, 419mg / L CaCl 2 , 324.6mg / L MgCl 2 , 36.98mg / LNa 2 SO 4 , 84.8mg / L Na 2 CO 3 , 769.8mg / L NaHCO 3 and the balance is water), stir until completely dissolved, then weigh 0.875g of AP-P4 dry powder and slowly add it to the above-mentioned simulated mineralized water containing tetramethylol glycoluril, stir until completely dissolved to obtain a composite oil displacement agent, wherein , the mass volume concentration of tetramethylol glycoluril is 50mg / L, and the mass volume concentration of AP-P4 is 1750mg / L.

[0025] The obtained composite oil displacement agent was sheared for 20 seconds with the first gear of the WARING agitator to simulate the state of the composite oil displacement agent after the surface injectio...

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Abstract

The invention discloses a composite oil displacement agent. The oil displacement agent comprises a glycoluril compound, a hydrophobically associating polymer and mineralized water; the glycoluril compound is at least one of glycoluril and tetrakis hydroxymethyl glycoluril; and the mass volume concentration of the glycoluril compound is 50-100 mg / L while the mass volume concentration of the hydrophobically associating polymer is 1000-2000 mg / L. The composite oil displacement agent disclosed by the invention has certain stability, and is beneficial to increasing of the recovery ratio of polymerflooding.

Description

technical field [0001] The invention relates to a composite oil displacement agent, which belongs to the technical field of petroleum exploitation. Background technique [0002] Hydrophobically associated water-soluble polymers are a class of water-soluble polymers that contain a small amount of hydrophobic groups (<2%, mole fraction) introduced into the polymer macromolecular chain. The molecular chain of this type of hydrophobic association polymer has both a hydrophilic main chain and a hydrophobic side group. Because the content of the hydrophobic group is very low, the polymer can be dissolved in water. Therefore, it has broad application prospects in many scientific fields such as tertiary oil recovery, drilling, coatings and drug controlled release. The basic principle of polymer flooding to enhance oil recovery is to increase oil displacement efficiency, which is mainly realized through adsorption and viscosity effects. Among these effects, the viscosity of polym...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588
Inventor 张磊吕鑫杨辉张健谭业邦
Owner CHINA NAT OFFSHORE OIL CORP
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