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Modifying and flooding agent and method for improving plugging efficiency of polymer microspheres

A technology of polymer and displacement agent, applied in chemical instruments and methods, drilling composition, etc., can solve the problems of limited liquid flow diversion effect and reduced plugging efficiency, etc.

Pending Publication Date: 2021-09-07
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydration expansion of microspheres will be affected by temperature, formation water salinity, calcium and magnesium ion concentration, etc., relying solely on the hydration expansion of polymer microspheres will make the liquid flow diversion effect very limited, resulting in reduced plugging efficiency

Method used

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  • Modifying and flooding agent and method for improving plugging efficiency of polymer microspheres
  • Modifying and flooding agent and method for improving plugging efficiency of polymer microspheres
  • Modifying and flooding agent and method for improving plugging efficiency of polymer microspheres

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preparation example Construction

[0035] In the present invention, the emulsion of the crosslinking agent is a water-in-oil emulsion with a crosslinking agent prepared by mixing an oil phase obtained. In the present invention, the preferred method for preparing the emulsion of the crosslinking agent comprises the steps of:

[0036] 1) mixing the emulsifier with the oil phase to obtain an emulsion;

[0037] 2) the step of mixing the emulsion obtained in 1) with a crosslinking agent, a crosslinking agent to give an emulsion.

[0038] The present invention is preferably mixed with the oil phase emulsifier to obtain an emulsion.

[0039] In the present invention, the emulsifier is preferably used in an amount of 17.8 - 19.4% by mass of the oil phase, and more preferably 18 to 19% by mass of an oil phase; the kind of the emulsifier is preferably from Span-60 and Tween-60 in at least one, and more preferably from Span-60 and Tween-60; when the emulsifier is Span-60 and Tween-60, Span-60 and the mass of Tween-60 or 9:1 i...

Embodiment 1

[0051] Flooding agent prepared by the following method:

[0052] (1) The solids content of 24.5% polyacrylamide microspheres are mixed with the test water, to give a concentration of 3000mg / L solution of polymeric microspheres;

[0053] Wherein the microspheres polyacrylamide water-in-oil emulsion; water injection test water QHD32-6 Bohai oilfield simulation, the water quality analysis results shown in Table 1;

[0054] Table 1 Water quality analysis

[0055]

[0056] (2) the step (1) to give a solution of polymeric microspheres with a crosslinking agent an organic chromium (Cr 3+ Mixing an amount of 1.2%) emulsion, to obtain flooding agent;

[0057] Wherein the concentration of the mixed flooding agent crosslinking agent is preferably 150mg / L; crosslinker emulsion water-in-oil emulsion with an oil phase prepared by mixing a crosslinking agent obtained in the following steps:

[0058] 1) Tween-60, Span-60 surfactant and liquid paraffin to obtain an emulsion;

[0059] Wherein...

Embodiment 2

[0062] The embodiment of Example 1, Step (2) adjusting the concentration of displacement agent in the crosslinking agent was changed to 600mg / L, ceteris paribus.

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Abstract

The invention provides a modifying and flooding agent for improving the plugging efficiency of polymer microspheres, and belongs to the technical field of oilfield development. The invention provides the modifying and flooding agent for improving the plugging efficiency of polymeric microspheres, and the modifying and flooding agent is prepared by a method comprising the following steps: mixing polymeric microspheres with water to obtain a polymeric microsphere solution, wherein the polymer microspheres are water-in-oil type emulsion; and mixing the polymer microsphere solution with a cross-linking agent or an emulsion of the cross-linking agent to obtain the modifying and flooding agent, wherein the emulsion of the cross-linking agent is a water-in-oil emulsion prepared by mixing the cross-linking agent and an oil phase. The result of the embodiment shows that the plugging rate of the modifying and flooding agent provided by the invention is 76.59-92.13%; compared with polymer microspheres with the same concentration under the same core permeability, the injection pressure is the same, and the resistance coefficient and the pressure gradient are basically consistent; and in the subsequent water stage, the residual resistance coefficient and the pressure gradient of the modifying and flooding agent are obviously higher.

Description

Technical field [0001] The present invention belongs to the technical field of oilfield development, in particular to a method of flooding agent and polymer microspheres plugging efficiency. Background technique [0002] Due to the heterogeneity of the reservoir more serious vast majority of oil fields in our country, so often poor water flooding, water flooding recovery usually only 27 to 40%, so a huge potential for enhanced oil recovery, chemical flooding is to improve effective means of heterogeneous reservoirs. [0003] In recent years, polymer flooding-based chemical flooding in our Daqing, Shengli, Henan, Dagang oil field have been widely used, and achieved good effect of increasing oil precipitation, but it must be noted that, since the polymer a long chain polymer, during the injection process, when the high injection pressure, the polymer molecules will enter into the low permeability layers, or a long-chain polymer is cut into the low-permeability layer, such that the ...

Claims

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Application Information

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IPC IPC(8): C09K8/516C09K8/512C09K8/508C09K8/588
CPCC09K8/516C09K8/512C09K8/5083C09K8/588
Inventor 刘进祥谢坤卢祥国郝敬滨邢剑飞曹伟佳曹豹闫坤
Owner NORTHEAST GASOLINEEUM UNIV
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