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Foaming agent composition used for high temperature and high salt oil reservoir

A technology of composition and foaming agent, which is applied in the field of foaming agent composition, can solve the problems of poor thermal stability of foaming agent and cannot meet the needs, and achieve the effect of improving salt resistance

Active Publication Date: 2013-08-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is that the thermal stability of the foam agent in the prior art is poor, and it cannot meet the needs of foam flooding in high-temperature and high-salinity formations due to the precipitation of divalent ions. A new foam agent combination is provided. thing

Method used

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  • Foaming agent composition used for high temperature and high salt oil reservoir
  • Foaming agent composition used for high temperature and high salt oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Add 93g (0.5 mole) dodecyl alcohol and the calcium oxide catalyst of alcohol weight 1% in the reactor that condensing device, stirring device and gas disperser are housed, when heating to 135 ℃ while flowing nitrogen, add 8g water , and stirred for 1 hour. Then first distilled water at normal pressure, then decompressed under 20 mm Hg vacuum, evaporated moisture at 140 DEG C in vacuum for 20 minutes, cooled the solution to 80 DEG C, slowly added dropwise neutralizing catalyst theoretical acid amount of 20% by weight concentrated sulfuric acid. Heat the system temperature to 80-90°C, turn on the vacuum system, dehydrate under high vacuum for 1 hour, then use nitrogen to blow 3-4 times to remove the air in the system, then adjust the reaction temperature of the system to 150°C Enter 155 grams of oxirane, control pressure<0.60MPa to carry out alkoxylation reaction; Obtain lauryl alcohol polyoxyethylene (7) ether.

[0026] (2) 240g (0.5 mole) of polyoxyethylene laury...

Embodiment 2

[0034] Take the foaming agent composition in [Example 1] and put it into a pressure bomb, put it into an oven and age it at 200°C for 10 days and take it out. Under the condition of a water bath at 90°C, the Roche method measures the foaming ability and foaming capacity of the composition after aging. The results of the half-life measured by the scanner are shown in Table 3.

[0035] table 3

[0036] X(weight)%

Embodiment 3

[0038]Get the foam composition lauryl alcohol polyoxyethylene (7) ether sodium benzene sulfonate 0.5 (weight)% in [embodiment 1], sodium dodecylbenzene sulfonate 0.1 (weight)%, carry out plugging performance In the evaluation experiment, the core tube filled with quartz sand has a permeability of 4D. The aqueous solution of the foaming agent composition is injected into the sand tube at a rate of 2mL / min, and nitrogen gas is injected at a rate of 9mL / min at the same time. The calculated resistance factor is 25.5. The foam flooding field requires a resistance factor greater than 4.

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Abstract

The invention relates to a foaming agent composition used for a high temperature and high salt oil reservoir, which mainly solves the problems existed in a foam flooding reinforcement oil extraction technology that the foaming agent has poor thermal stability, deposition is generated when meeting with divalent ion, the requirements of the foam flooding in a high temperature and high salinity stratum are not satisfied. According to the invention, the technical scheme of the foaming agent composition which is composed of polyoxyethylene alkyl ether benzene sulfonate, alkybenzene sulfonate and water is used for better solving the problems, and can be used for oil extraction by reinforcing the foam flooding.

Description

technical field [0001] The invention relates to a foaming agent composition for high-temperature and high-salt oil reservoirs. Background technique [0002] The main oilfields in my country have entered a high water cut period after primary and secondary recovery. How to improve oil recovery and maximize the development of remaining reserves, tertiary oil recovery technology has played a very important role in ensuring stable and high production of oil fields. Among new technologies for tertiary oil recovery, chemical composite flooding is still one of the most promising methods. The oil displacement mechanism is mainly that the polymer or glue increases the viscosity of the displacement water, reduces the oil-water mobility ratio, alleviates the channeling phenomenon, and improves the sweep efficiency; surfactants and alkalis reduce the oil / water interfacial tension, increase the capillary number, and promote Crude oil is desorbed and effectively dispersed from rocks to ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
Inventor 何秀娟张卫东沙鸥李应成
Owner CHINA PETROLEUM & CHEM CORP
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