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Low-temperature high-salt-resistant deep profile control and displacement crosslinking system as well as preparation method and application thereof

A technology of cross-linking system and flood control, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as poor stability, and achieve the effects of good stability, high blocking rate, and adjustable freezing strength.

Active Publication Date: 2022-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing profile control system cannot be gelled or has poor stability after gelling in low-temperature and high-salt reservoirs, the present invention provides a low-temperature (20-40°C) high-salt (salinity>6× 10 5 mg / L) reservoirs, the gelling time is controllable from 36 to 96 hours, the freezing strength E to H level is adjustable, and the preparation method is simple and practical. The purpose of dominant seepage channel and enhanced oil recovery

Method used

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  • Low-temperature high-salt-resistant deep profile control and displacement crosslinking system as well as preparation method and application thereof
  • Low-temperature high-salt-resistant deep profile control and displacement crosslinking system as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A cross-linking system suitable for deep control and flooding of low-temperature and high-salt reservoirs, composed of: 0.30% polymer flocculant, 0.40% hexamethylenetetramine, 0.01% resorcinol, 0.10% small molecular organic acid , Water 99.19%. The mass of each component is: polymer flocculant 0.30g; hexamethylenetetramine 0.40g; resorcinol 0.01g; small molecule organic acid 0.10g; water 99.19g.

[0032] Its preparation method is as follows:

[0033] (1) Take 99.19 g of water and add 0.30 g of polymer flocculant to the water while stirring, and continue stirring for 2 to 3 hours to obtain a polymer flocculant solution;

[0034] (2) Then slowly add 0.40 g of hexamethylenetetramine, 0.01 g of resorcinol, and 0.10 g of small molecule organic acid while stirring, and continue stirring for 0.5 h to obtain a gelling solution of the crosslinking system;

[0035] (3) Put the gelling solution in multiple ampoules, sinter and seal it with an alcohol lamp, then place it in an oven...

Embodiment 2

[0041] A cross-linking system suitable for deep control and flooding of low-temperature and high-salt reservoirs, composed of: 0.40% polymer flocculant, 0.50% hexamethylenetetramine, 0.04% resorcinol, 0.15% small molecular organic acid , Water 98.91%. The mass of each component is: polymer flocculant 0.40g; hexamethylenetetramine 0.50g; resorcinol 0.04g; small molecule organic acid 0.15g; water 98.91g.

[0042] Its preparation method is as follows:

[0043] (1) Take 98.91 g of water and add 0.40 g of polymer flocculant to the water while stirring, and continue stirring for 2 to 3 hours to obtain a polymer flocculant solution;

[0044] (2) Then slowly add 0.50 g of hexamethylenetetramine, 0.04 g of resorcinol, and 0.15 g of small molecule organic acid while stirring, and continue stirring for 0.5 h to obtain a gelling solution of the cross-linking system;

[0045] (3) Put the gelling solution in multiple ampoules, sinter and seal it with an alcohol lamp, then place it in an o...

Embodiment 3

[0051] A cross-linking system suitable for deep control and flooding of low-temperature and high-salt reservoirs, composed of: 0.50% polymer flocculant, 0.60% hexamethylenetetramine, 0.05% resorcinol, 0.20% small molecular organic acid , Water 98.65%. The mass of each component is: polymer flocculant 0.50g; hexamethylenetetramine 0.60g; resorcinol 0.05g; small molecule organic acid 0.20g; water 98.65g.

[0052] Its preparation method is as follows:

[0053] (1) Take 98.65 g of water and add 0.50 g of polymer flocculant to the water while stirring, and continue stirring for 2 to 3 hours to obtain a polymer flocculant solution;

[0054] (2) Then slowly add 0.60 g of hexamethylenetetramine, 0.05 g of resorcinol, and 0.20 g of small molecule organic acid while stirring, and continue stirring for 0.5 h to obtain a gelling solution of the regulating and driving cross-linking system;

[0055] (3) Put the gelling solution in multiple ampoules, sinter and seal it with an alcohol lamp...

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Abstract

The invention relates to a low-temperature high-salt-resistant deep profile control and displacement crosslinking system as well as a preparation method thereof. The crosslinking system comprises the following components in percentage by mass: 0.1-0.7% of a polymeric flocculant, 0.1-0.8% of hexamethylenetetramine, 0.01-0.2% of resorcinol, and 0.05-1.0% of micromolecular organic acid, with the balance being water. The cross-linking system can be suitable for deep profile control and flooding of low-temperature (20-40 DEG C) high-salinity (the degree of mineralization is larger than 6.0*10<5> mg / L) oil reservoirs, the gelling time is controllable in 36-96 h, the freezing strength E-H level is adjustable. The preparation method is simple and practical, non-flowing high-strength gel can be formed at the low temperature, and the cross-linking system is good in stability and high in plugging strength under the high-salinity condition, effective plugging can be formed on a high-permeability stratum or a dominant channel, and the effect of improving the recovery ratio is remarkable.

Description

technical field [0001] The invention belongs to the technical field of chemical products used in oil fields, and in particular relates to a cross-linking system suitable for low-temperature, high-salt deep-seated control and flooding, and a preparation method and application thereof. Background technique [0002] As my country's onshore oilfields have successively entered high water cut periods, large pores or dominant water flow channels have gradually formed in the deep reservoirs. Conventional plugging and regulating technologies cannot meet the needs of deep reservoir problems, and deep regulating and flooding technologies have emerged as the times require. This technology combines the characteristics of profile control and polymer flooding, which can improve the direction of liquid flow in deep formations, expand the swept volume of water flooding, and improve oil recovery. Among many deep profile control and flooding technologies, gel profile control and cross-linking ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/88
CPCC09K8/512C09K8/5083C09K8/887C09K8/882
Inventor 何青水佟颖李燕何汉平杨顺辉肖超
Owner CHINA PETROLEUM & CHEM CORP
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