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Method of continuous dissolution of polyacrylamide emulsions for enhanced oil recovery (eor)

A technology of enhanced oil recovery and inverse emulsion, applied in dissolution methods, chemical instruments and methods, dissolution, etc., can solve the problems of long residence time and high cost

Active Publication Date: 2011-03-30
S P C M SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0037] - Large continuous or batch units, which allow long residence times, are expensive in terms of investment, volume and maintenance

Method used

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  • Method of continuous dissolution of polyacrylamide emulsions for enhanced oil recovery (eor)
  • Method of continuous dissolution of polyacrylamide emulsions for enhanced oil recovery (eor)
  • Method of continuous dissolution of polyacrylamide emulsions for enhanced oil recovery (eor)

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Experimental program
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Effect test

preparation example Construction

[0069] 1. Preparation of emulsion

[0070] In order to obtain the maximum viscosity under the conditions of use, the standard product is a polyacrylamide emulsion containing 70% acrylamide and 30% acrylic acid.

[0071] The standard emulsion is prepared by methods well known to those skilled in the art, with many possible variations.

[0072] Mix the following in the water phase in a dissolution tank cooled to 20°C:

[0073] - 4596 kg of 50% acrylamide solution obtained by biological methods,

[0074] -1108kg of high-purity glacial acetic acid,

[0075] -1104kg of water,

[0076] -1086kg of high-purity 50% sodium hydroxide solution,

[0077] - 360 g of sodium bromate,

[0078] -Versenex 80 of 4680g,

[0079] - 240kg of sodium acetate,

[0080] - 4320 g of sodium formate.

[0081] In a 10000 liter reactor, prepare the oil phase by mixing:

[0082] - 49kg of Hypermer 2296 (CRODA) - 3037kg of Exsol D100

[0083] -197kg of sorbitan oleate

[0084] -39kg of Tween81 (CR...

Embodiment 1

[0111] Injection device such as figure 1 shown.

[0112] It is necessary to repeatedly inject 200m into the oil well 3 / h of brine containing 1000 ppm polymer or 3300 ppm emulsion (660 l / h). This volume is much higher than that commonly used for flocculation and there is little previous experience in this field.

[0113] The following conditions apply to this system:

[0114] MS1 water flow: 20m 3 / h

[0115] Emulsion flow: 660 liters / h

[0116] Pressure drop: 2.8bar

[0117] MS2 total flow: 200m 3 / h

[0118] Pressure drop: 2.4bar

[0119] A sample was collected and stirred with a magnetic stirrer for 5 minutes to obtain a filtration ratio of 1.3

Embodiment 2

[0121] Assembly No.2 is used under the following conditions:

[0122] MS2 total flow: 200m 3 / h

[0123] Mixer pressure drop: 2.3bar

[0124] Difficult to filter test this solution, FR higher than 5.

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PUM

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Abstract

Enhanced oil recovery method consisting in continuously dissolving, in the injection water, a stable invert emulsion of acrylamide (co)polymer containing at least one inverting agent, and a water soluble polymer, whereby: - in a first step, the emulsion is prediluted in a first static mixer to a (co)polymer concentration of at least 5 g / l, the difference of pressure between the mixer outlet and inlet being at least 2 bar, - in a second step, the suspension from the first mixer is diluted in a second static mixer to a concentration corresponding to the injection concentration of the water in the well of between 500 and 3000 ppm, the difference of pressure between the mixer outlet and inlet being at least 1 bar.

Description

Background technique [0001] Polyacrylamide is produced industrially in various forms: powder, water-in-oil emulsion, polymer bead suspension, water-in-water emulsion, aqueous solution, water-ethanol suspension, etc. [0002] These polymers may have similar physicochemical properties and are usually selected based on two criteria: [0003] - the cost, in this case the choice of powder, [0004] - Ease of handling, despite the higher cost, opt for emulsions. [0005] These emulsions were discovered by J.W. Vanderhoff and R.M. Wiley in 1957 (USP 3284393). [0006] These early emulsions contained polymeric microparticles which were emulsified in oil by using one or more surfactants with a low HLB (hydrophilic-hydrophobic balance) of about 2-6. For these emulsions with this composition, it is difficult to directly dilute the polymer microgels in solution. In fact, the water used for dissolution hardly penetrates the surfactant barrier. [0007] Therefore, it is usually dried b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C08J3/03C09K8/588
CPCE21B21/062C09K8/588B01F1/0022E21B43/25B01F1/0005B01F21/02B01F21/20
Inventor 勒内·皮迟菲利普·杰罗尼莫
Owner S P C M SA
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