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Desorbants for enhanced oil recovery

A crude oil, application technology, applied in the direction of production fluid, earthwork drilling, drilling composition, etc., can solve the problems of extraction efficiency impact, cost impact, process cost affecting extraction efficiency, etc.

Pending Publication Date: 2019-09-20
RHODIA OPERATIONS SAS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although they do prove to be effective in reducing water / oil interfacial tension, these anionic surfactants have a disadvantage in that they tend to remain trapped in subterranean formations, typically in view of the phenomena of chemisorption at rock surfaces, This significantly affects extraction efficiency and / or process cost
[0007] Among other things, the surfactant thus immobilized in the reservoir may no longer participate in the transfer and extraction of the oil, and the extraction efficacy is thus affected
Strong adsorption can be compensated by using high concentrations of surfactants, but at a cost
More generally, the phenomenon of surfactant adsorption has a negative impact on extraction costs

Method used

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  • Desorbants for enhanced oil recovery

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0068] static adsorption

[0069] This example illustrates the effect of a compound of formula (I) on the adsorption of an anionic surfactant formulation (a mixture of sodium olefin sulfonate and alkyl ether sulfate) on different types of rock.

[0070] The anionic surfactant formulation used in this example was prepared in high hardness brine, ie containing 35 000 ppm of dissolved salts containing 3000 ppm of divalent cations (calcium and magnesium).

[0071] Adsorption was measured on different types of ground rocks (sandstone from Clashach, limestone from Lavoux, dolomite) by a standard method, the specific surface area of ​​the rocks determined with krypton according to the BET method, by dividing the ground Rocks were introduced into brine where the rock / brine mass ratio solids concentration was 20% by weight (2 g of rock in 10 g of brine) where the concentration of anionic surfactant in the brine was 2 g / L.

[0072] The adsorption of the formulations is measured first w...

example 2

[0077] Use of compounds of formula (I) for enhanced recovery of hydrocarbons

[0078] In this instance, Rhodasurf ® LA12 was used as a desorbent in an experiment reproducing the conditions of enhanced recovery of crude oil (tertiary recovery experiment), using the same brine as in Example 1.

[0079]To do this, samples of the rock (core samples from sandstone in Clashach) were subjected to conditions representative of mature oil reservoirs (conditions called residual oil saturation) according to known methods.

[0080] Intensive mining (level 3) is then carried out under the following conditions:

[0081] (i) Inject a solution of surfactant (mixture of sodium olefin sulfonate and alkyl ether sulfate - 8 g / L) and polymer (Flopaan 3330S sold by SNF - 2 g / L) into which a total of 0.5 volume (0.5 PV) of the pores of this formulation; and then

[0082] (ii) Inject 1.5 PV of the polymer (2 g / L) and 2 g / L of Rhodasurf ® A solution of LA12;

[0083] (iii) Inject 2 PV of saline....

example 3

[0091] Use of compounds of formula (I) for enhanced recovery of hydrocarbons

[0092] In this instance, Rhodasurf ® LA12 was used in an experiment to reproduce the conditions for enhanced recovery of crude oil (tertiary recovery experiment), using the same brine as Example 2.

[0093] To do this, as in the previous example, a sample of rock (core sample) is subjected to conditions representative of a mature oil reservoir (referred to as residual oil saturated conditions) according to known methods. In contrast to the previous experiments, the oil used in this example was a reservoir oil (petroleum).

[0094] Intensive mining (level 3) is then carried out under the following conditions:

[0095] (i) Inject surfactant (mixture of sodium olefin sulfonate and alkyl ether sulfate - 8 g / L) and polymer (Flopaan 3330S sold by SNF - 2 g / L), and also 0.3 g / L Solution of Rhodasurf LA12. A total of 0.5 volumes (0.5 PV) of the wells injected with this formulation; and then

[0096] (...

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Abstract

Desorbants for enhanced oil recovery are disclosed. The invention relates to the use of at least one compound corresponding to the following formula: R-O-(-CH<2>-CH(-CH<3>)-O-)<m>-(-CH<2>-CH<2>-O-)<n>-H where: R is a hydrocarbon-based group comprising from 6 to 40 carbons; m ranges from 0 to 20; n, which is greater than m, ranges from 5 to 40, in order to inhibit the phenomena of retention of anionic surfactants within an oil-bearing reservoir, in particular within a carbonate or clay reservoir.

Description

[0001] This application is a divisional application of the following application: application date January 25, 2013, application number 201380016268.8, invention title "desorbent for enhanced recovery of crude oil". technical field [0002] The present invention relates to the field of enhanced recovery of crude oil from subterranean formations, and more particularly to the problem of retention of surfactants in these subterranean formations during the steps of enhanced recovery of crude oil. Background technique [0003] In the process of extracting oil from a hydrocarbon reservoir (e.g., a productive reservoir such as consolidated or unconsolidated rock formations, or sand), according to a first step known as "primary The overpressure that naturally prevails in the reservoir is entrained out of the producing well. This primary recovery allows recovery of only a small amount of crude oil contained in the reservoir, typically a maximum of about 10% to 15%. [0004] To enabl...

Claims

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Application Information

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IPC IPC(8): C09K8/584
CPCC09K8/584E21B43/16
Inventor M.莫尔万P.莫罗R.塔巴里B.巴赞
Owner RHODIA OPERATIONS SAS