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Modifying and flooding agent suitable for high-temperature and high-salt heavy oil reservoir and preparation method of profile control and flooding agent

A technology for heavy oil reservoirs, high temperature and high salt, applied in the direction of chemical instruments and methods, drilling compositions, etc. Oil effect and other issues to achieve the effect of maintaining stability, increasing viscosity, and improving water absorption profile

Inactive Publication Date: 2021-06-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of this profile control agent is simple, the cost is low, the construction is convenient, and it can achieve the effect of deep profile control and flooding, but it is not suitable for high temperature and high salinity reservoir conditions with a temperature of 130°C and a salinity of 220,000 mg / L
[0005] On the whole, high-temperature and high-salt polymer oil recovery technology has been studied by many parties. The concept of high-temperature and high-salt is mostly limited to the research object, and some practical polymer agent systems have been developed in a targeted manner. The temperature resistance and salt resistance are limited. Under the condition of high temperature and high salt, the viscosity of the polymer aqueous solution will be reduced, and the effect of water control and oil stabilization will be lost. Moreover, the polymer with a salt resistance of 220,000 mg / L and a temperature resistance of 130°C is in a blank research stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] The preparation method of AM / NVP / AMPS is similar to that of AM / AMPS, and the specific preparation process will not be repeated here.

[0033] The crosslinking agent has a great influence on the final gelling performance of the polymer, such as the gelation time, the viscosity and stability of the polymer after gelation, etc. Therefore, the selection of the crosslinking agent is particularly important. In the present invention, the crosslinking agent is a combination of phenols and aldehydes, wherein phenols include phenol, resorcinol and hydroquinone, and aldehydes include formaldehyde, isophthalaldehyde, terephthalaldehyde and Urotropine. Further preferably, the crosslinking agent is a combination of hydroquinone and urotropine. Preferably, the mass ratio of hydroquinone to urotropine is 2:1˜1:2, more preferably the mass ratio of hydroquinone to urotropine is 2:1˜1:1.

[0034] The stabilizer is preferably nanoparticles, including silica sol, silica-alumina sol and al...

Embodiment 1

[0042]Weigh 99.43g of simulated water with a salinity of 220,000 mg / L in a beaker, slowly add 0.25g of AM / AMPS polymer (mass ratio AM:AMPS=3:7) while stirring at a speed of 500r / min, stir Uniformly, then add 0.02g crosslinking agent (mass ratio is the hydroquinone and urotropine composition of 2:1) and 0.3g silica sol, stir, make it fully mix, promptly obtain the present invention's The polymer forms a glue. Put it in a sample bottle, seal it, and place it in a constant temperature oil bath at 130°C. Observe that the gelling time is 12 hours, and the gelling viscosity can reach 930mPa·s. The gelling viscosity of the cross-linking system is relatively high. Good long-term thermal stability at high temperature.

[0043] To investigate the ability of the control and flooding agent provided in this example to enhance oil recovery, the specific experimental process is as follows: the artificial sandstone core was dried, saturated with simulated water, then saturated with formation...

Embodiment 2

[0045] Weigh 99.33g of simulated water with a salinity of 220,000 mg / L in a beaker, slowly add 0.35g of AM / AMPS polymer (mass ratio AM:AMPS=3:7) while stirring at a speed of 500r / min, stir Uniformly, then add 0.02g crosslinking agent (mass ratio is the hydroquinone and urotropine composition of 2:1) and 0.3g silica sol, stir, make it fully mix, promptly obtain the present invention's The polymer forms a glue. Put it in a sample bottle, seal it, and place it in a constant temperature oil bath at 130°C for observation. The gelling time is 10 hours, and the gelling viscosity can reach 1050mPa·s. The gelling viscosity of the cross-linking system is relatively high. Good long-term thermal stability at high temperature.

[0046] To investigate the ability of the control and flooding agent provided in this example to enhance oil recovery, the specific experimental process is as follows: the artificial sandstone core was dried, saturated with simulated water, then saturated with form...

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Abstract

On one hand, the invention discloses a modifying and flooding agent suitable for a high-temperature and high-salt heavy oil reservoir, the modifying and flooding agent is prepared from the following components in percentage by mass: 0.2-0.5% of a polymer, 0.01-0.1% of a cross-linking agent, 0.2-0.8% of a stabilizer and the balance of water, and the polymer is AM / AMPS or AM / NVP / AMPS. The invention further discloses a preparation method of the modifying and flooding agent suitable for the high-temperature and high-salt heavy oil reservoir. The modifying and flooding agent suitable for the high-temperature and high-salt heavy oil reservoir has high viscosity, the crosslinking strength is 800-1200 mPa.s, the viscosity of injected water can be greatly improved, long-term stability can be kept under the high-temperature and high-salt conditions, the water absorption profile can be effectively improved, the problem of water channeling of the injected water is solved, and the water-oil displacement effect under the high-temperature and high-salt oil reservoir condition is improved, so that the heavy oil recovery rate is increased.

Description

technical field [0001] The invention relates to the field of oil and gas water injection well control and displacement technology, in particular to a control and displacement agent suitable for high-temperature and high-salt heavy oil reservoirs and a preparation method thereof. Background technique [0002] In the process of oilfield development, in order to increase the swept volume of injected water and prevent water channeling, polymers can be used to increase the viscosity of the displacement fluid, thereby reducing the water-oil mobility ratio, thereby achieving the purpose of enhancing oil recovery. [0003] For high-temperature and high-salt heavy oil reservoirs, temperature-resistant and salt-resistant control and displacement agents developed using polymers as displacement media have been publicly reported. For example, patent CN201310235127.7 discloses a temperature-resistant and salt-resistant terpolymer for oil flooding and its preparation method. A functional m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/588C08F220/58C08F220/56C08F226/10
CPCC09K8/512C09K8/588C08F220/58C08F220/56C08F226/10
Inventor 赵海洋曹畅刘磊杨祖国王建海任波闫科举程仲富邢钰范伟东李亮任琛王磊磊王莎
Owner CHINA PETROLEUM & CHEM CORP
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