Strengthened oil displacement method

An oil displacement method and oil displacement technology, which are applied in chemical instruments and methods, earthwork drilling, and fluid production, etc., can solve the problems of low oil displacement efficiency in low-permeability reservoirs, achieve excellent interfacial activity, improve oil displacement efficiency, The effect of excellent temperature resistance

Active Publication Date: 2014-08-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem of low oil displacement efficiency in low-permeability reservoirs in the prior art, and an active water displacement method suitable for low-permeability reservoirs is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Take 208.8 grams (0.2 moles) of octadecyl polyoxypropylene (m=3) polyoxyethylene (n=10) sodium ether hydroxypropanesulfonate, 10.5 grams of dodecyltrimethylammonium chloride ( 0.04 mol), ethanol content of 40wt% ethanol salt solution (salt solution is 5wt% sodium chloride solution) 450 grams were added to the reaction flask in turn, heated to 70 ° C and stirred for 2.5 hours, and the ethanol was removed by distillation under reduced pressure to obtain the required Anion-yang system surfactant. Add low-permeability reservoirs in Jiangsu Sha 7 Oilfield (average gas-tested permeability is 45×10 -3 μm 2 ) injection water (total salinity TDS is 500 mg / L, Mg 2+ +Ca 2+ 25 mg / L), stirred at 30°C for 2 hours to obtain 0.6wt% anion-yang surfactant mother liquor, diluted with water of the same salinity to different concentrations, and measured the oil-water ratio between the surfactant solution and the dehydrated crude oil of the block Interfacial tension, the test tempera...

Embodiment 2

[0040] (1) Take 218.8 grams (0.2 moles) of nonylphenol polyoxypropylene (m=8) polyoxyethylene (n=6) potassium ether sulfonate, 36.4 grams (0.1 moles) of cetyltrimethylammonium bromide ), 375 grams of methanol deionized aqueous solution with a methanol content of 20wt% were sequentially added to the reaction flask, heated to 60°C and stirred for 3 hours, and the methanol was distilled off under reduced pressure to obtain the desired anion-cation system surfactant. Same as [Example 1] (1) prepare 0.6wt% surfactant mother liquor, measure the oil-water interfacial tension at different concentrations, the results are shown in Table 2.

[0041] (2) Same as [Example 1] (2), the results are shown in Table 6.

[0042] Table 2

[0043]

Embodiment 3

[0045] (1) Take 310.4 grams (0.4 moles) of synthesized behenylpolyoxypropylene (m=4) polyoxyethylene (n=2) sodium ether ethanesulfonate, 11.2 grams of decyltrimethylammonium bromide ( 0.04 mol), isopropanol content of 30wt% isopropanol salt aqueous solution (salt water is an aqueous solution containing 10wt% sodium chloride and 5wt% potassium chloride) 470 grams were added to the reaction flask in turn, heated to 50 ° C and stirred for 3 hours , Isopropanol was distilled off under reduced pressure to obtain an anion-cation system surfactant. With [Example 1] (1) prepare 0.6wt% surfactant mother liquor, measure the oil-water interfacial tension when different concentrations, the total salinity TDS of injection water used is 1500 mg / liter, Mg 2+ +Ca 2+ It is 45 mg / liter, and the results are shown in Table 3.

[0046] (2) Same as [Example 1] (2), except that the oil displacement temperature is 95°C, and the core permeability is 34.3×10 -3 μm 2 , the anion and yang surfactants...

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Abstract

The invention relates to an active water oil displacement method used for low permeability reservoirs, in particular to a strengthened oil displacement method, and mainly solves the problem of low efficiency of oil displacement of the low permeability reservoirs in the prior art. According to the oil displacement method, a positive-negative system surfactant containing a 0.01-1.0wt% anionic-nonionic surfactant and a cationic surfactant in a molar ratio of 1:0.01-0.99 is injected into a water solution to form active water, dehydrated crude is enabled to be in contact with the active water under the condition of injected water at the oil displacement temperature of 40-100 DEG C with total mineralization (total dissolved solid) TDS more than 200mg/L, and crude in the core is displaced sufficiently. The problem is well solved, and the strengthened oil displacement method can be applied to tertiary recovery production of the low permeability reservoirs.

Description

technical field [0001] The invention relates to an enhanced oil displacement method, in particular to an enhanced oil displacement method in a low-permeability oil field. Background technique [0002] There is no uniform and fixed standard and boundary for low-permeability oilfields in the world, it is only a relative concept. In my country, low-permeability oilfields are generally divided into three categories according to the average permeability of reservoirs. The first category is general low-permeability oil fields, the average permeability of oil layers is 10.1~150×10 -3 μm 2 ; The second category is ultra-low permeability oilfields, the average permeability of oil layers is 1.1~10×10 -3 μm 2 ; The third category is ultra-low permeability oil fields, the average permeability of oil layers is 0.1~1.0×10 -3 μm 2 , the oil layer is very dense and bound. Low-permeability sandstone reservoirs have huge resource potential and are relatively difficult to explore and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/584
Inventor 沈之芹翟晓东沙鸥李斌金军
Owner CHINA PETROLEUM & CHEM CORP
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