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Aqueous polymer solution containing electrolyte and method for tertiary oil recovery of petroleum

A polymer solution, water-based polymer technology, applied in drilling compositions, chemical instruments and methods, and production fluids, etc., can solve problems such as being unsuitable for surfactant flooding

Active Publication Date: 2019-05-31
TOUGAS OILFIELD SOLUTIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Consequently, these copolymers construct a three-dimensional network in the presence of such metal ions and are therefore not suitable for surfactant flooding where cross-linked copolymers are not employed

Method used

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  • Aqueous polymer solution containing electrolyte and method for tertiary oil recovery of petroleum
  • Aqueous polymer solution containing electrolyte and method for tertiary oil recovery of petroleum
  • Aqueous polymer solution containing electrolyte and method for tertiary oil recovery of petroleum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 4

[0097] Examples 1 to 4: Inverse emulsion polymerization

Embodiment 1

[0099] C at 160g 11 -C 16 20 g of sorbitan monooleate were dissolved in the isoparaffin. 110 g of water and 36 g of ammonia solution (25%) were placed in a beaker, cooled to 5°C, and 110 g of 2-acrylamido-2-methylpropanesulfonic acid was added. The pH was adjusted to 7.1 by means of aqueous ammonia solution (25%). Next, 146.66 g of acrylamide (50% aqueous solution) was added.

[0100] The aqueous monomer solution was added under vigorous stirring to the 11 -C 16 A solution of isoparaffin and sorbitan monooleate. Inertize with nitrogen for 45 minutes. To start, dissolve 0.5 g of azoisobutyronitrile into 12 g of C 11 -C 16 isoparaffin and added to the reaction mixture and the solution was heated to 50 °C. As soon as the maximum temperature is reached, heat to 80° C. by means of an oil bath for 2 hours. The suspension was cooled to room temperature and used without further treatment.

Embodiment 2

[0102] Prepared analogously to Example 1, but with the following monomer components: 110 g of 2-acrylamido-2-methylpropanesulfonic acid, 55 g of acrylamide, 18.3 g of N-vinylpyrrolidone.

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Abstract

The invention describes an electrolyte-containing aqueous polymer solution having a salt content of 5% to 35% by weight, based on the total amount of the polymer solution, which contains at least one Dissolved synthetic copolymers, the structural units of which are derived from (i) amides of at least one ethylenically unsaturated carboxylic acid, and (ii) at least one ethylenically unsaturated sulfonic acid or alkali metal and / or ammonium salts thereof, Also, the aqueous polymer solution contains at least one nonionic surfactant selected from the group consisting of alkoxylated fatty alcohols, alkoxylated alkylphenols and / or Alkoxylated fatty acids, provided that the average degree of alkoxylation of these surfactants is 8‑10. The aqueous polymer solution is used in the tertiary recovery of petroleum and is characterized by very good filtration properties, especially in the presence of brine.

Description

technical field [0001] The invention relates to an electrolyte-containing aqueous polymer solution and its use in petroleum tertiary oil recovery. Background technique [0002] It has been known for many years that only a small fraction of the oil can be recovered from petroleum oil beds in primary oil recovery methods. Tertiary oil recovery measures (such as water flooding) provide larger quantities of crude oil. However the majority of the oil present still remains in the oil bed. Tertiary oil recovery measures (enhanced oil recovery (EOR)) are known to be used to significantly increase the productivity of oil beds. One of these EOR methods involves so-called polymer flooding. In this method, aqueous polymer solutions are used, sometimes in combination with surfactants, in order to positively influence the oil extraction from the oil bed. [0003] By increasing the viscosity of the water with the added polymer, the water to crude oil flow ratio is changed in a way that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/588C08F2/32
CPCC09K8/584C08F220/52C08L33/26C09K8/588C08F220/585C08F220/56C08F226/10E21B43/16
Inventor 卡罗琳·乌泽纳曼弗雷德·克拉腾马赫尔法蒂玛·杜贡吉克-彼里克马里塔·诺伊贝尔
Owner TOUGAS OILFIELD SOLUTIONS GMBH