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Polyacrylamide reversed-phase microemulsion profile control system

A technology of inverse microemulsion and polyacrylamide, which is applied in the direction of drilling compositions, chemical instruments and methods, and can solve the problems of uncontrollable and poor microsphere expansion performance

Active Publication Date: 2015-01-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is that the polymer microspheres in the prior art are easily broken through by subsequent water flooding after profile control, and the expansion performance of the microspheres is poor and uncontrollable under the condition of high temperature and high salinity , to provide a new polyacrylamide inverse microemulsion control and flooding system, the hydrophobic monomer introduced in the system is not only beneficial to the stability of the microemulsion control and flooding system, but also causes a certain degree of stickiness between the polymer microspheres In order to improve the effect of water plugging and profile control, it can meet the field operation requirements of oil recovery such as water plugging, deep profile control and displacement in oilfield tertiary oil recovery, and has good economy

Method used

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  • Polyacrylamide reversed-phase microemulsion profile control system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 120g of gasoline, 56g of sorbitan monostearate, and 18g of octylphenol polyoxyethylene ether (7) into the reaction kettle, stir to mix evenly, control the temperature in the kettle to 29°C, and the stirring speed to 300rpm. Add 75g of water, 96g of acrylamide, 20g of sodium acrylate, 20g of N-vinylpyrrolidone, 2g of triallylamine, 2g of sodium malonate, 0.5g of disodium edetate, and 2g of isopropanol into the batching kettle , 5g thiourea, 3g sodium thiosulfate, 2.4g azobisisobutylamidine hydrochloride, stir to make it dissolve evenly, adjust the pH value to 8.2 with NaOH aqueous solution; in addition, dissolve 3.5g ammonium persulfate in 10g In deionized water, 1.2g of N-phenylmaleimide was dissolved in 4.8g of gasoline for subsequent use. Introduce the prepared water phase and gasoline solution of N-phenylmaleimide into the reactor, stir to make it fully emulsified, add ammonium persulfate aqueous solution, the temperature of the system rises to 66°C, continue the...

Embodiment 2

[0036] With [Example 1], just replace 1.2g N-phenylmaleimide with 0.9g N-phenylmaleimide and 0.3g n-butyl methacrylate, adopt [Example 1] Described method or standard test the extractable solids content, microsphere initial particle size and distribution, expansion multiple of the product obtained, and observe its steady state, the results are shown in Table 1.

Embodiment 3

[0038] With [Example 1], just replace N-phenylmaleimide with n-octadecyl acrylate, adopt the method described in [Example 1] or the standard test of the product's extractable solids content, micro The initial particle size and distribution of the ball, the expansion multiple, and observe its steady state, the results are shown in Table 1.

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Abstract

The invention relates to a polyacrylamide reversed-phase microemulsion profile control system, and mainly solves the problems in the prior art that a polymer microballon subjected to profile control is easily broken through by water flooding and is bad in expansion property at a high temperature and a high salinity. The polyacrylamide reversed-phase microemulsion profile control system is prepared from a reversed-phase microemulsion under the effect of an oxidation reduction composite initiator through a polymerization reaction. The reversed-phase microemulsion comprises, in parts by weight, 1) 10-70 parts of an oily solvent, 2) 1-25 parts of an emulsifier, 3) 0.01-15 parts of a hydrophobic monomer, 4) 5-60 parts of acrylamide, 5) 1-40 parts of a water-soluble temperature-resistant salt-resistant monomer, 6) 0.001-5 parts of a cross-linking agent, and 7) 10-60 parts of water. The technical scheme relatively well solves the problems and applicable to tertiary oil recovery.

Description

technical field [0001] The invention relates to a polyacrylamide inverse microemulsion control and flooding system and a preparation method thereof. Background technique [0002] After primary and secondary oil recovery in major domestic oil fields, the water content of crude oil continues to increase, and some large oil fields have entered the stage of tertiary oil recovery. Polymer flooding is the main technical method of tertiary oil recovery. The oil flooding mechanism is clear, the process is relatively simple, and the technology is becoming more and more mature. It is an effective technical measure for enhancing oil recovery. However, for heterogeneous formations, the displacement can only act on the high-permeability layer, not the oil-bearing low-permeability layer, which reduces the recovery rate of crude oil and increases the cost. Generally, injection well profile control and production well water plugging technology are often used for heterogeneous formations, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F226/10C08F226/06C08F220/18C08F220/34C08F212/12C08F220/54C08F2/32C08F4/40C09K8/588C09K8/44
Inventor 于志省夏燕敏苏智青蔡红
Owner CHINA PETROLEUM & CHEM CORP
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