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Composition for maintaining stability of residual polymer in polymer flooding produced water, and applications thereof

A technology of composition and polymer, applied in drilling composition, mining wastewater treatment, water/sewage treatment and other directions, can solve problems such as affecting stability, achieve enhanced stability, maintain good micropore passage, and facilitate The effect of redistribution

Inactive Publication Date: 2018-09-28
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in addition to residual polymers, polymer flooding produced water usually also contains emulsified oil, suspended solids and metal ions, such as Fe 2+ and Fe 3+ , they will affect the stability of residual polymers in produced water from polymer flooding, therefore, how to maintain the stability of residual polymers in produced water from polymer flooding is one of the urgent research issues in oilfields

Method used

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  • Composition for maintaining stability of residual polymer in polymer flooding produced water, and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Composition formula 1: the components in the composition are calculated by mass concentration: OP-10 with a mass concentration of 50 mg / L is used as an emulsified oil influence inhibitor, and carboxymethyl cellulose sodium with a mass concentration of 100 mg / L is used as a solid suspension Impact inhibitor, and the disodium oxalate tetraacetate that mass concentration is 50mg / L affects inhibitor as metal ion.

[0027] When the residual polymer concentration is 150mg / L, the emulsified oil concentration is 200mg / L, and the solid suspension concentration is 25mg / L, Fe 2+ The concentration is 3mg / L, Fe 3+ Add the composition formula 1 to the produced water of polymer flooding with a concentration of 4mg / L, and monitor the hydrodynamic radius R of the residual polymer at 0h, 8h, and 24h respectively h , the time t required for micropores to pass through, and the results are shown in Table 1 below.

Embodiment 2

[0029] Composition formula 2: the components in the composition are calculated by mass concentration: OP-10 with a mass concentration of 100 mg / L is used as an emulsified oil influence inhibitor, and carboxymethyl cellulose sodium with a mass concentration of 100 mg / L is used as a solid suspension Impact inhibitor, and the disodium oxalate tetraacetate that mass concentration is 50mg / L affects inhibitor as metal ion.

[0030] In the polymer flooding produced water under the same conditions as in Example 1, add composition formula 2, and monitor respectively 0h, 8h, and the hydrodynamic radius R of the residual polymer at the time of 24h h , the time t required for micropores to pass through, and the results are shown in Table 1 below.

Embodiment 3

[0032] Composition formula 3: the components in the composition are calculated by mass concentration: OP-10 with a mass concentration of 100 mg / L is used as an emulsified oil influence inhibitor, and carboxymethyl cellulose sodium with a mass concentration of 150 mg / L is used as a solid suspension Impact inhibitor, and the disodium oxalate tetraacetate that mass concentration is 50mg / L affects inhibitor as metal ion.

[0033] In the polymer flooding produced water under the same conditions as in Example 1, add composition formula 3, and monitor 0h, 8h, and the hydrodynamic radius R of the residual polymer at 24h h , the time t required for micropores to pass through, and the results are shown in Table 1 below.

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Abstract

The invention discloses a composition for maintaining the stability of the residual polymer in polymer flooding produced water, wherein the composition comprises, by mass concentration, 50-200 mg / L aninhibitor for emulsified oil-induced influence, 100-150 mg / L an inhibitor for solid suspended matter-induced influence, and 50-100 mg / L an inhibitor for metal ion-induced influence, wherein the inhibitor for emulsified oil-induced influence is selected from AEO-7 and OP-10, the inhibitor for solid suspended matter-induced influence is selected from sodium silicate, sodium carboxymethyl celluloseand polyvinyl alcohol, and the inhibitor for metal ion-induced influence is selected from ethylenediaminetetraacetic acid disodium salt and sodium citrate. The invention further discloses applicationsof the composition. According to the present invention, after the composition is added to the polymer flooding produced water, the stability of the residual polymer can be enhanced, such that the subsequent treatment can be conveniently performed, the residual polymer in the polymer flooding produced water is not easily aggregated, the hydrodynamic radius remains the unchanged state within 24 h,and the passing ability of the micropores is good.

Description

technical field [0001] The invention belongs to the technical field of petroleum industry, in particular to a composition for maintaining the stability of residual polymer in polymer flooding produced water, and also relates to the application of the composition. Background technique [0002] Produced water from polymer flooding, that is, produced water from polymer flooding, is a polymer-containing produced water. It is different from produced water from water flooding. The main difference is that it contains a certain concentration of residual polymers. Due to the existence of this part of residual polymers , the viscosity of polymer-containing produced water is higher than that of water flooding produced water, and the higher the residual polymer concentration is, the higher the viscosity of polymer-containing produced water is. Compared with the pre-use polymer products that have not been injected into the formation, the relative molecular weight of the residual polymer ...

Claims

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Application Information

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IPC IPC(8): C09K8/588C02F1/00C02F103/10
CPCC02F1/00C02F2103/10C09K8/588
Inventor 陈斌赵林陈士佳王成胜李奇耿孝恒郭海滢
Owner YANGTZE UNIVERSITY
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