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Organic/inorganic composite colloidal dispersion gel and preparation method thereof

A colloidal dispersion and composite colloidal technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of short gel formation time, difficult to control, difficult to control, short crosslinking time, etc., and achieve gel formation. Time controllable, small environmental impact, and the effect of improving system viscosity

Active Publication Date: 2013-11-27
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these cross-linking agents, Cr(Ⅲ) and phenolic cross-linking agents are highly toxic, and Al(Ⅲ) cross-linking agents can only adapt to neutral and weakly acidic low-temperature formations
In addition, the crosslinking time of direct use of these systems is often too short to be easily controlled
Liu Qingwang used aluminum citrate to cross-link HPAM in the article "Research on Polyacrylamide Colloidal Dispersion Gel (CDG) Deep Profile Control Technology". During the study, it was found that the gel was formed in salt water for 15 minutes. Once the gel was formed, the particle size disappeared. Change, there is no process of particle size growing gradually, when the gel is cross-linked, the temperature has little effect on the gelation time of the gel, that is, the gelation time is short and difficult to control

Method used

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  • Organic/inorganic composite colloidal dispersion gel and preparation method thereof
  • Organic/inorganic composite colloidal dispersion gel and preparation method thereof
  • Organic/inorganic composite colloidal dispersion gel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1, preparation CDG-25-0 and CDG-25-600

[0041] Configure a mineralized aqueous solution with a salinity of 6664mg / L (which contains 6190mg / L NaCl, 81.67mg / L KCl, 263.12mg / L CaCl 2 , 151.72mg / L MgCl 2 , 9.03mg / L Na 2 SO 4 , 43.75mg / L NaHCO 3), add partly hydrolyzed polyacrylamide, stir to dissolve, make HPAM solution with a concentration of 1750mg / L, adjust the pH to 7.0, add aluminum citrate to the solution and stir to dissolve so that the aluminum concentration reaches 25mg / L (take this sample and record it as CDG-25-0); continue to add tetramethylol glycoluril to it, stir and dissolve to make the content reach 600g / L, and obtain the product of the present invention, and the sample number is marked as degradation sample CDG-25-600. Constant temperature aging at 60°C.

[0042] Samples were taken for viscosity measurement when the aging time was 0h, 26h, 47h, 98h, 140h, 240h, 333h, 480h and 866h.

[0043] The intermediate sample CDG-25-0 was also aged at...

Embodiment 3

[0048] Example 3. Preparation of CDG-120-0 and CDG-120-600 (aging at 60°C)

[0049] Configure a mineralized aqueous solution with a salinity of 6664mg / L (which contains 6190mg / L NaCl, 81.67mg / L KCl, 263.12mg / L CaCl 2 , 151.72mg / L MgCl 2 , 9.03mg / L Na 2 SO 4 , 43.75mg / L NaHCO 3 ), add partly hydrolyzed polyacrylamide, stir to dissolve, make HPAM solution with a concentration of 1750mg / L, adjust the pH to 7.0, add aluminum citrate to the solution and stir to dissolve so that the aluminum concentration reaches 120mg / L (this sample is recorded as CDG -120-0), add tetramethylol glycoluril to sample CDG-120-0, stir and dissolve to make the content reach 600g / L, and obtain the product of the present invention, and the sample number is recorded as degradation sample CDG-120-600 constant temperature 60 ℃ aging.

[0050] Samples were taken for viscosity measurement when the aging time was 0h, 26h, 47h, 98h, 140h, 240h, 333h, 480h and 866h.

[0051] Viscosity measurements were perf...

Embodiment 4

[0055] Embodiment 4, preparation CDG-120-1000

[0056] The steps in Example 3 are basically the same, except that tetramethylol glycoluril is added to make the content reach 1000g / L to obtain the product of the present invention, the sample number is marked as degradation sample CDG-120-1000, and the temperature is 60°C Ageing.

[0057] Samples were taken for viscosity measurement when the aging time was 0h, 26h, 47h, 98h, 140h, 240h, 333h, 480h and 866h.

[0058] Viscosity measurements were performed at 25°C with the rotor shear rate fixed at 7.26s -1 , Various viscosities are listed in Table 4.

[0059] Table 4 Viscosity change of aging sample CDG-120-1000 at 460°C

[0060] aging time

[0061] 333h

[0062] It can be seen from Table 4 that, compared with the sample CDG-120-600, when the amount of tetramethylol glycoluril added increases from 600 mg / L to 1000 mg / L, the viscosity of the sample CDG-120-1000 decreases slightly. This is because as the amou...

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Abstract

The invention discloses an organic / inorganic composite colloidal dispersion gel and a preparation method thereof. The colloidal dispersion gel comprises water, an acrylamide polymer, an inorganic cross-linking agent and an organic cross-linking agent; in the colloidal dispersion gel, the massic volume concentrations of the acrylamide polymer, the inorganic cross-linking agent and the organic cross-linking agent are 1000 to 2000 mg / L, 10 to 130 mg / L and 50 to 1000 mg / L, respectively; the inorganic cross-linking agent is aluminum citrate, and the organic cross-linking agent is tetramethylol acetylenediurea. The preparation method for the composite colloidal dispersion gel comprises the following steps: adding the acrylamide polymer into the water so as to obtain a polymer solution and regulating and controlling the pH value of the polymer solution to be 6.0 to 7.5; and adding the inorganic cross-linking agent and the organic cross-linking agent into the polymer solution and carrying out aging so as to obtain the composite colloidal dispersion gel. The organic / inorganic composite colloidal dispersion gel provided by the invention has a wide operating temperature range and can effectively improve the viscosity of the acrylamide polymer in a range of 35 to 85 DEG C. A crosslinking system is nontoxic and poses little influence to the environment.

Description

technical field [0001] The invention relates to an organic / inorganic composite colloidal dispersion gel and a preparation method thereof. Background technique [0002] Cross-linked polymer flooding technology is a new oil flooding technology developed on the basis of polymer flooding and gel water plugging technology. It has become one of the effective means to enhance oil recovery because of its characteristics of less consumption, obvious enhanced oil recovery, and strong adaptability, and can be used in reservoir environments with different salinities. The cross-linked gel system is a polymer gel formed by water-soluble polymers and cross-linking agents that can be slowly cross-linked and has a controllable viscosity. The system has both fluidity and strength. The polymer commonly used in cross-linked gel systems for EOR is hydrolyzed polyacrylamide (HPAM), and its molecular chain contains both amide groups and carboxyl groups generated by hydrolysis. The commonly used ...

Claims

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Application Information

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IPC IPC(8): C08L33/26C08K5/098C08K5/21C08J3/24C09K8/588
Inventor 辛海鹏吕鑫张健梁守成李强谭业邦
Owner CHINA NAT OFFSHORE OIL CORP
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