Three-segment type block releasing technique for oil layer

A three-stage, plugging-removing technology, applied in the direction of production fluid, wellbore/well components, drilling composition, etc., can solve problems such as short validity period, clogging of oil and water well reservoirs, unsatisfactory effect, etc., to reduce energy depleting, clogging-reducing, restoring or permeability-enhancing effects

Inactive Publication Date: 2008-06-11
DAQING GASOLINEEUM INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Focusing on the clogging of oil-water well reservoirs caused by the injection of ternary composite fluids, in recent years, hydraulic oscillation, high-pressure water rotary jet physical plugging removal and injection technology, hot gas acid, oxidant chemical plugging removal technology, foam acidification have been app

Method used

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  • Three-segment type block releasing technique for oil layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Formula 1: The first stage of strong penetrating swelling solution: 1% hydrogen peroxide + 0.2% 6501 + 0.05% chloroform + 0.2% sodium di-sec-octyl maleate + 98.55% water;

[0048] The second acid corrosion chelating solution: 3% hydrochloric acid + 1% acetic acid + 0.5% propynyl alcohol + 1.5% ammonium chloride + 0.5% hydrofluoric acid + 0.2% 6501 + 0.05% ethylenediaminetetraacetic acid (EDTA) + 93.25% water;

[0049] The third stage of extrusion protection solution: 0.6% dodecyl ammonium bromide quaternized polymer solution + 99.4% water.

[0050] The results of the permeability recovery experiment on the polymer-plugged artificial core are shown in Table 1:

[0051] Table 1 Core permeability and recovery rate table

[0052]

Core number

K 1

(×10 -3 μm 2 )

K 2

(×10 -3 μm 2 )

K 3

(×10 -3 μm 2 )

restore permeability

(%)

Increase penetration

K...

Embodiment 2

[0060] Formula 2: The first stage of strong penetrating swelling solution: 1% sodium perborate + 0.2% 6501 + 0.05% chloroform + 0.2% sodium di-sec-octyl maleate + 98.55% water;

[0061] The second acid corrosion chelating solution: 3% hydrochloric acid + 1% acetic acid + 0.5% propynyl alcohol + 1.5% ammonium chloride + 0.5% hydrofluoric acid + 0.2% 6501 + 0.05% ethylenediaminetetraacetic acid (EDTA) + 93.25% water;

[0062] The third stage of extrusion protection solution: 0.6% dodecyl ammonium bromide quaternized polymer solution + 99.4% water.

[0063] Table 3 shows the results of the permeability recovery experiment on the polymer-plugged artificial core.

[0064] Table 3 Core permeability and recovery rate table

[0065] Core number

K 1

(×10 -3 μm 2 )

K 2

(×10 -3 μm 2 )

K 3

(×10 -3 μm 2 )

restore permeability

(%)

Increase penetration

P...

Embodiment 3

[0070] Formula 3: The first stage of strong penetrating swelling solution: 1% hydrogen peroxide + 0.2% 6501 + 0.05% chloroform + 0.2% sodium di-sec-octyl maleate + 98.55% water;

[0071] The second acid corrosion chelating solution: 10% hydrochloric acid + 1% acetic acid + 0.5% propynyl alcohol + 1.5% ammonium chloride + 4% hydrofluoric acid + 0.2% 6501 + 0.05% ethylenediaminetetraacetic acid (EDTA) + 82.75% water;

[0072] The third stage of extrusion protection solution: 0.6% dodecyl ammonium bromide quaternized polymer solution + 99.4% water.

[0073] See Table 5 for the results of the permeability change experiment of Hailaer low-permeability cores before and after treatment.

[0074] Table 5 Permeability change table before and after treatment

[0075] Core No.

[0076] It can be seen from the above table that this patented technology can effectively improve the permeability of low-permeability Hailaer Oilfield, that is, this patent is also ...

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Abstract

The invention relates to an oil layer three-section block removing technology with excellent block removing effect. A block removing agent will be injected at three sections; then, clear water will be injected after the reaction of 4 to 24 hours at each section; the quantity of clear water will be 1 to 2 times of the sum between the volume of an oil pipe and the volume of the circular space from the bottom of the oil pipe to the top of a perforation interval. Because the composition and function of the block removing agents different from each other, the invention can be applied in a broad scope to adopt to the needs in various stratum, realize excellent block removing effect with the removing rate of over 75 percent, thus satisfying the industrial needs.

Description

Technical field: [0001] The invention relates to a blocking-removing technology used when an oil-water well reservoir is blocked, in particular to a chemical blocking-removing technology using a blocking-removing agent. Background technique: [0002] With the development of tertiary oil recovery, the ASP flooding technology has achieved good research and application results, and its promotion scale has gradually expanded. However, the oil displacement mechanism of ASP flooding is complicated and there are many influencing factors. After the chemical agent (mainly alkali) of the ASP flooding injection system is injected into the formation, on the one hand, it mixes with the fluid in the formation to undergo physical and chemical reactions, and on the other hand, it reacts with rock minerals, breaking the physical and chemical balance between the original fluid and rock minerals , to change underground fluids, rocks, and minerals. That is, after the displacement agent enters ...

Claims

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Application Information

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IPC IPC(8): E21B43/27C09K8/78
Inventor 曹广胜李福军孙志巍夏惠芬
Owner DAQING GASOLINEEUM INST
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