Three-segment type block releasing technique for oil layer

A three-stage, plugging-removing technology, which is applied in the direction of production fluid, wellbore/well components, drilling composition, etc., can solve the problems of oil-water well reservoir clogging, unsatisfactory effect, short validity period, etc., to slow down clogging , restore or increase permeability, and reduce energy consumption

Inactive Publication Date: 2011-06-08
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 applied successively in oil fields. Plugging removal technology, ultrasonic plugging removal technology, but these plugging removal technology measures have a short period of validity and the effect is not ideal, and have not fundamentally solved the problem of oil-water well reservoir blockage caused by ternary compound injection

Method used

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  • Three-segment type block releasing technique for oil layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Formula 1: The first stage of strong penetration swelling liquid: 1% hydrogen peroxide + 0.2% 6501 + 0.05% chloroform + 0.2% sodium di-sec-octyl maleate + 98.55% water;

[0047] The second stage of acid erosion chelating liquid: 3% hydrochloric acid + 1% acetic acid + 0.5% propynol + 1.5% ammonium chloride + 0.5% hydrofluoric acid + 0.2% 6501 + 0.05% ethylenediaminetetraacetic acid (EDTA)+ 93.25% water;

[0048] The third stage squeeze protection solution: 0.6% diddecadimethylammonium bromide quaternized polymer solution + 99.4% water.

[0049] The results of the permeability recovery experiment of the artificial core plugged by polymer are shown in Table 1:

[0050] Table 1 Core permeability and recovery rate table

[0051]

Core number

K 1

(×10 -3 μm 2 )

K 2

(×10 -3 μm 2 )

K 3

(×10 -3 μm 2 )

Recovery permeability

(%)

Increase penetration

K 3 / K 2

2-1

56

12

49

87.5

4.08

2-2

54

10.9

41

76

3.76

2-3

55

11.2

46

83.6

4.1

[0052]...

Embodiment 2

[0059] Formulation 2: The first stage of strong penetration swelling liquid: 1% sodium perborate + 0.2% 6501 + 0.05% chloroform + 0.2% sodium di-secondary octyl sulfonate maleate + 98.55% water;

[0060] The second stage of acid erosion chelating liquid: 3% hydrochloric acid + 1% acetic acid + 0.5% propynol + 1.5% ammonium chloride + 0.5% hydrofluoric acid + 0.2% 6501 + 0.05% ethylenediaminetetraacetic acid (EDTA)+ 93.25% water;

[0061] The third stage squeeze protection solution: 0.6% diddecadimethylammonium bromide quaternized polymer solution + 99.4% water.

[0062] Table 3 shows the results of the permeability recovery experiment of the polymer plugged artificial core.

[0063] Table 3 Core permeability and recovery rate table

[0064]

Core number

K 1

(×10 -3 μm 2 )

K 2

(×10 -3 μm 2 )

K 3

(×10 -3 μm 2 )

Recovery permeability

(%)

Increase penetration

K 3 / K 2

[0065] 3-1

66

10.5

58.4

88.5

4.08

3-2

64

9.8

51.3

80.2

3.76

[0066] Se...

Embodiment 3

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

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

[0072] The third stage squeeze protection solution: 0.6% diddecadimethylammonium bromide quaternized polymer solution + 99.4% water.

[0073] The results of the permeability change experiment before and after the treatment of the Hailar low permeability core are shown in Table 5.

[0074] Table 5 Permeability changes before and after treatment

[0075] Core Number

[0076] It can be seen from the above table that the patented technology can effectively improve the permeability of the low-permeability Hailar oil field, that is, the patent is also applicable to low-permeabi...

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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 plugging removal technology used when oil-water well reservoirs are blocked, in particular to a chemical plugging removal technology that uses a plugging removal agent for plugging removal. Background technique: [0002] With the development of tertiary oil recovery, ternary combination flooding technology has achieved good research and application results, and the scale of promotion is gradually expanding, but the combination flooding mechanism is complicated and many influencing factors. After the ternary combination flooding injection system chemicals (mainly alkali) are injected into the formation, on the one hand, they mix with the fluid in the formation to produce physical and chemical reactions, and on the other hand, they react with rock minerals, breaking the physical and chemical balance between the original fluid and rock minerals. , Causing changes in underground fluids, rocks and minerals. That is, after the displac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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