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
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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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