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Process for Enhanced Oil Recovery by Injecting Polymer Solution

A technology of enhanced oil recovery and polymer, which is applied in the direction of drilling composition, production fluid, earthwork drilling and production, etc., and can solve problems not introduced

Active Publication Date: 2017-10-10
S P C M SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Again, the documentation does not describe the resistance of these polymers to Fe 2+ Ability to degrade conditions of ions and oxygen or hydrogen sulfide and oxygen

Method used

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  • Process for Enhanced Oil Recovery by Injecting Polymer Solution
  • Process for Enhanced Oil Recovery by Injecting Polymer Solution
  • Process for Enhanced Oil Recovery by Injecting Polymer Solution

Examples

Experimental program
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Embodiment Construction

[0116] The invention and its advantages can be best seen from the following examples, which are provided for the purpose of explanation of the invention and no limitation is implied.

[0117] Polymers exhibit resistance under highly degrading conditions (full aerobic conditions)

[0118] A series of polymers were tested under highly degrading conditions. In the presence of 7ppm dissolved oxygen (aerobic conditions) and 10ppm Fe 2+ In the aqueous salt solution of ions, each polymer can decompose 2000ppm. The aqueous saline solution contained 30 g / l sodium chloride and 3 g / l calcium nitride.

[0119] These solutions were stored at a temperature of 20°C and their viscosities were measured after 7 days and 30 days still at 20°C using a Brookfield viscometer with a UL spindle at 6 revolutions per minute (rpm).

[0120] Viscosity loss (expressed as %) refers to the difference between the initial viscosity and the viscosity after standing for 7 days or 30 days divided by the initi...

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Abstract

The aqueous solution used in the enhanced oil recovery process comprises at least one linear or structured water-soluble copolymer obtained by the polymerization of: - at least 10 mol% of 2-acrylamide in free acid and / or salted form - 2-methylpropane sulfonate Acid monomer; - at least 10 mol % of at least one comonomer selected from the group comprising acrylamide, N-vinylpyrrolidone (NVP) and the acrylamide derived monomer of formula (I): wherein : R=H or CH3 or CH2COOR', R' is an alkyl group composed of up to 3 carbon atoms; A is an N heterocyclic ring containing 4 to 6 carbon atoms and having an ether functional group or a ketone functional group in its ring.

Description

technical field [0001] The invention relates to the technical field of enhanced oil recovery in formations. More precisely, the subject of the present invention is an improved enhanced oil recovery process consisting in introducing into the formation a fluid comprising ferrous ions, hydrogen sulfide and / or dissolved oxygen, said fluid being rendered viscous by means of an aqueous polymer solution, Stabilizing compounds are not used. [0002] More specifically, the present invention relates to improved enhanced oil recovery processes employing specific polymers to achieve enhanced performance in environments that degrade the polymers, even without the use of polymer-stabilizing compounds. Background technique [0003] Most fields currently in operation have reached maturity and in fact production has begun to decline or is about to decline. The degree of recovery of these fields currently averages between 15 and 35%. Therefore, they still have huge production potential. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C08F26/06
CPCC08F220/56C08F220/58C08F226/10C09K8/588C08F220/585C08F220/06E21B43/16
Inventor C·法韦罗S·达拉斯B·焦万内蒂
Owner S P C M SA
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