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Monomer with the same charge associating polymer composite oil displacement agent and alternate injection flooding method

A compound oil displacement agent and alternate injection technology, which is applied in the direction of drilling compositions, chemical instruments and methods, and production fluids, can solve problems such as difficult to significantly increase oil recovery, and achieve increased fluidity controllable range, The effect of improving oil displacement efficiency and increasing hydrophobic association strength

Active Publication Date: 2021-09-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Related studies on composite flooding show that improving mobility is the main mechanism of chemical flooding to enhance oil recovery, and it is difficult to significantly enhance oil recovery without polymer-assisted low interfacial tension surfactant flooding (MA Bataweel, AY Shivaprasad, HA Nasr-El -Din.Low-Tension Polymer Flooding Using Amphoteric surfant inHigh Salinity / High Hardness and High Temperature Conditions in SandstoneCores[J].Society of Petroleum Engineers,2012)

Method used

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  • Monomer with the same charge associating polymer composite oil displacement agent and alternate injection flooding method
  • Monomer with the same charge associating polymer composite oil displacement agent and alternate injection flooding method
  • Monomer with the same charge associating polymer composite oil displacement agent and alternate injection flooding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1 Hydrophobically associating polymers interact with surfactants.

[0052] Preparation of hydrophobic association polymer mother liquor: first weigh the measured 5000mg / L NaCl brine in a stirred container, start the agitator, and slowly add a certain amount of the aforementioned hydrophobically modified polyacrylamide HP-Y dry powder purified to In the water, the dry powder should be added along the vortex. Pay attention to make the dry powder fully dispersed in the water, otherwise it is easy to form fish eyes. Stir at a constant speed (400r / min) in a constant temperature water bath at 45°C for 6 hours to prepare a polymer mother liquor with a mass concentration of 5000mg / L, and place it for 24 hours before use.

[0053] Preparation of surfactant mother liquor: Weigh a certain mass of anionic surfactant sodium dodecylbenzenesulfonate (SDBS), cationic surfactant octadecyltrimethylammonium chloride (1831), zwitterionic surfactant Agent octadecyl hydroxypropyl su...

Embodiment 2

[0065] Example 2 Competitive adsorption experiment of hydrophobic association polymer and surfactant.

[0066] According to the experimental results in Example 1, surfactant 1831 was selected as a representative for competitive adsorption experiments. The concentration of the surfactant was 300 mg / L, and the concentration of the hydrophobic association polymer HP-Y was 1200 mg / L.

[0067] Static adsorption capacity determination:

[0068] (1) Prepare a series of HP-Y and 1831 solutions with different mass concentrations in 5000mg / L NaCl brine, measure the concentration of HP-Y and 1831 in each solution in turn, which is the initial concentration before the oil displacement agent is adsorbed, denoted as C 0 ;

[0069] (2) Add quartz sand and oil-displacing agent to a solid-to-liquid ratio of 1:5 (10g quartz sand: 50mL oil-displacing agent) into a ground-mouthed Erlenmeyer flask with a stopper, shake and mix well, cover the bottle stopper, and use The sealing tape further sea...

Embodiment 3

[0093] Example 3 The effect of injection mode on the interaction between hydrophobically associating polymers and surfactants.

[0094] In this example, three different injection methods are used to inject HP-Y and 1831 components of the same quality, and the effects of these three injection methods on the hydrophobicity of porous media are investigated: Influence law of associative polymer-surfactant interaction.

[0095] Experimental steps of injection into flat sand-included mold with three pressure measuring points:

[0096] (1) Select 160-180 mesh quartz sand to fill the flat plate sand inclusion model, connect and debug the instrument, and put each working fluid into a high-precision injection pump for use;

[0097] (2) Saturate the filled flat plate sand model with 5000mg / L NaCl brine, measure its wet weight after 2 hours of saturation, and determine the pore volume (PV) and porosity of the model;

[0098] (3) Inject 4PV 5000mg / L NaCl brine, and measure the water perm...

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Abstract

The invention belongs to the technical field of enhanced oil recovery by chemical flooding, and provides a composite oil displacement agent composed of hydrophobic association polymers with the same monomer charge, a preferred surfactant or its composition, and water, and an alternate injection flooding agent. oil method. The interaction between the hydrophobic association polymer and the preferred surfactant can increase the viscosity of the association polymer by more than two orders of magnitude, and the poly / surface action viscosity increasing efficiency is the highest. The amount first increases and then decreases, and the preferred surfactant is more easily replaced by the hydrophobic association polymer on the rock surface. The oil displacement method is multiple rounds of alternate injection, effectively controlling the layers where the fluidity changes suddenly during the oil displacement process, and improving the mobility ratio of the oil displacement agent to the crude oil. The invention solves the problems of high dosage of traditional composite flooding, difficult injection of high-viscosity oil-displacement agent, and difficult treatment of produced fluid, and can be used in tertiary oil recovery production of medium-low permeability, post-chemical flooding and heavy oil reservoirs.

Description

technical field [0001] The invention belongs to the technical field of enhanced oil recovery by chemical flooding, and in particular relates to a composite oil-displacement agent containing a hydrophobic association polymer and a surfactant and an oil-displacement method. Background technique [0002] In the process of oilfield development, composite flooding is one of the effective methods to greatly enhance oil recovery. Composite oil-displacement agents generally refer to any two or more combinations of oil-displacement agents such as polymer oil-displacement agents, surfactant oil-displacement agents, alkali oil-displacement agents, and biological oil-displacement agents. However, the large-scale application of this technology is restricted due to problems such as high cost, scaling of wellbore and formation, and difficulty in producing produced fluid in the application of composite flooding. Therefore, the development of composite flooding technology with lower cost, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C09K8/584E21B43/22
CPCC09K8/584C09K8/588E21B43/16
Inventor 冯茹森李华兵
Owner SOUTHWEST PETROLEUM UNIV
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