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A polymer suitable for high temperature and high salinity oil reservoirs and its preparation method

A technology with high salinity and polymers, applied in drilling compositions, chemical instruments and methods, earthwork drilling and production, etc., can solve the problems of reduced oil displacement efficiency, sedimentation and large viscosity drop of the three-component composite system, etc. Achieve good chemical stability, inhibit high temperature and oxidative degradation, and enhance oil recovery

Active Publication Date: 2018-03-16
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-valent cations, rigid structural units and zwitterionic polymers introduced in these two polymers are prone to precipitation and large viscosity drop when encountering alkali, which will reduce the oil displacement efficiency of the three-component composite system.

Method used

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  • A polymer suitable for high temperature and high salinity oil reservoirs and its preparation method
  • A polymer suitable for high temperature and high salinity oil reservoirs and its preparation method
  • A polymer suitable for high temperature and high salinity oil reservoirs and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1. Preparation of polymers suitable for high temperature and high salinity reservoirs

[0027] (1) Dissolve 108g of benzyl alcohol in 200mL of ethanol to form an ethanol solution of benzyl alcohol, then add 70g of paraformaldehyde, lye made of 106g of sodium carbonate and 290mL of water, stir well and heat to 95-100°C for closed reaction 5-6 hours. After cooling, the reactant was poured into 500 mL of cold water, and the crude product was precipitated. The crude product was recrystallized from absolute ethanol to obtain 121 g of white crystalline compound II—tribenzyl alcohol, with a yield of 72%.

[0028] The synthetic route is as follows such as formula (1), and paraformaldehyde is depolymerized to obtain formaldehyde monomer at this reaction temperature, so the reactant in formula (1) is formaldehyde monomer:

[0029]

[0030] (2) Stir 10g of partially hydrolyzed polyacrylamide (HPAM) (degree of hydrolysis 25-30mol%) and 500mL of water evenly, heat to 40...

Embodiment 2

[0036] Example 2. Preparation of ternary composite system suitable for high temperature and high salinity reservoirs

[0037] Add 0.025-0.3wt% alkylbenzene sulfonate surfactant and 0.4-1.2wt% sodium carbonate in each polymer DQHTP solution of 1700mg / L-3700mg / L that embodiment one obtains, at 25 ℃ condition Stirring for 30 minutes, a series of ASP flooding systems suitable for high-temperature and high-salinity reservoirs with a viscosity of 2-30mPa·s were obtained, as shown in 1 in Table 1. # -5 # .

Embodiment 3

[0038] Embodiment three, the influence of the ternary composite system of polymer composition of the present invention on oil-water interfacial tension

[0039] With alkylbenzene sulfonate (concentration is 0.025wt%-0.3wt%), sodium carbonate (concentration is 0.4wt%-1.0wt%) and the polymer that embodiment one obtains (concentration is 3200mg / L) preparation obtains a The series is suitable for the ternary compound system of high temperature and high salinity reservoirs.

[0040] Take existing two kinds of ternary composite systems as comparative example: one is made of petroleum sulfonate product PS-100 (concentration is 0.3wt%), sodium carbonate (concentration is 0.4-1.2wt%) and partially hydrolyzed polyacrylamide (concentration is 3200mg / L, degree of hydrolysis 25mol%) is prepared; Another is by heavy alkylbenzene sulfonate BHJ-Q (concentration is 0.3wt%), sodium carbonate (concentration is 0.4-1.2wt%) and part It is prepared by hydrolyzing polyacrylamide (concentration: 320...

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Abstract

The invention discloses a polymer suitable for high temperature and high salinity reservoirs and a preparation method thereof. The chemical structural formula of the polymer is as follows:. The polymer has a network structure, which can effectively inhibit high temperature and oxidative degradation, thereby effectively improving salt resistance and enhancing viscosity. After the polymer of the present invention is introduced into the ternary composite system, the ternary composite system has good chemical stability and excellent salt resistance under conditions of high temperature and high salinity, and can be used under the condition of weak alkali sodium carbonate The interfacial tension of crude oil / formation water is reduced to ultra-low, and the recovery rate can be increased by more than 20%, so that the obtained ternary composite system can be applied to extreme high temperature and high salinity reservoir conditions.

Description

technical field [0001] The invention relates to a polymer used in an ternary compound oil displacement system used in the oil exploitation process, in particular to a polymer suitable for high-temperature and high-salinity oil reservoirs and a preparation method thereof. Background technique [0002] The ASP flooding technology has become a relatively mature technology and has been applied in major oilfields in my country. This technology uses the means of increasing the viscosity of the injected displacement phase, improving the mobility ratio of oil-water flow in the reservoir fluid, and reducing the interfacial tension between oil and water, so as to achieve the purpose of expanding the degree of sweep and improving the recovery of the reservoir (Peng Guofeng, Zhao Tianhong , Chen Cuihua, et al. Chemical Engineers, 2005, 123(12), 36-39.). However, this technology is limited by temperature and salinity in the implementation process. Under high temperature conditions, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/30C08F120/56C08J3/24C09K8/588E21B43/22
Inventor 程杰成伍晓林吴军政侯兆伟陈劼赵新窦绪谋金锐周万富张世东
Owner PETROCHINA CO LTD
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