Binary composite oil dispelling system and optimization method thereof

A binary compound flooding and optimization method technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of limited fluid sweep coefficient capability, easy deformation, and inability to significantly increase the resistance coefficient, so as to improve oil recovery Yield, reducing chemical cost, and avoiding the effect of chemical flooding risk

Inactive Publication Date: 2015-08-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0005] The study found that the oil droplets eluted from the ultra-low interfacial tension system are small, highly dispersed, and easy to deform (due to low interfacial tension and low interfacial energy), and can easily pass through the pore throats, so they are quickly absorbed by the subsequent fluid along the high-permeability large The drag coefficient cannot be significantly improved, so the ability to increase the sweep coefficient of subsequent fluids is limited

Method used

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  • Binary composite oil dispelling system and optimization method thereof
  • Binary composite oil dispelling system and optimization method thereof
  • Binary composite oil dispelling system and optimization method thereof

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Embodiment 1

[0020] 1. Experimental materials and preparation methods

[0021] In this example, the polymer is selected from partially hydrolyzed polyacrylamide; the surfactant is selected from anionic surfactant petroleum sulfonate KPS and its compound product with anionic-nonionic surfactant YG210-10; the simulated water is made of a Prepared from the injection water of offshore oilfields, the total salinity is 8094mg / L; the crude oil used to measure the oil-water interfacial tension comes from the degassed crude oil produced from the same offshore oilfield; the degassed crude oil is used for displacement tests Simulated crude oil diluted to 15.1 mPa·s with aviation kerosene.

[0022] 2. Experimental conditions

[0023] Viscosity was measured at 65°C, 7.34S -1 The other experiments were carried out at the same temperature.

[0024] 3. Experimental process

[0025] Step 1: Prepare common polymer (polyacrylamide) mother liquor, and then dilute it into a polymer solution with a certain ...

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Abstract

The invention discloses a binary composite oil dispelling system and an optimization method thereof. The oil dispelling system is prepared by compounding polymer and a surfactant; the polymer is partly-hydrolyzed polyacrylamide, the surfactant is one or two of anionic surfactant (petroleum sulfonate) and anionic-non-ionic surfactant, and the oil dispelling system is applied to chemical oil dispelling of heterogeneous oil reservoir. By adjusting the interface tension of the binary composite system of polymer and surfactant, the oil yield of middle / high permeability oil reservoir can be prominently increased, the provided optimization method is especially suitable for efficient chemical oil dispelling of middle / high permeability heterogeneous oil reservoir, the reagent cost is effectively reduced, and the risk of chemical oil dispelling is avoided.

Description

technical field [0001] The invention belongs to the technical field of chemical flooding, and in particular relates to a binary compound oil flooding system and an optimization method for the formula of the binary compound oil flooding system. Background technique [0002] Although polymer flooding is a relatively mature chemical flooding technology, it mainly enhances oil recovery by increasing the sweep coefficient. Since the improvement of recovery is achieved by increasing the sweep coefficient and oil washing efficiency, polymer flooding is a technology with an incomplete enhanced recovery mechanism. In order to make up for the deficiency of polymer flooding enhanced recovery mechanism, the Surfactant / polymer binary compound flooding technology. This technology can not only improve the sweep coefficient by increasing the viscosity of the oil-displacing agent, but also reduce the interfacial tension of oil and water to improve the oil-washing efficiency of the oil-displ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/588
CPCC09K8/584C09K8/588
Inventor 王业飞张健赵福麟李先杰陈五花吕鑫周薇高国强付继彤张建华聂晓斌陈权生
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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