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Profile control and water plugging system with controllable low temperature gelatinizing and preparation method thereof, and profile control and water plugging method

A technology for profile control and water shutoff, which is applied in chemical instruments and methods, earthwork drilling, drilling composition, etc. Ease of shipping, shipping, and on-site formulation, simplifying the effects of formulation components

Inactive Publication Date: 2016-08-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the existing profile control and water shutoff agents are mainly used in medium-high temperature (above 60°C) reservoirs, and also have complex formula components, long gelation time at low temperature (20-40°C), and low colloidal strength. problems, thus limiting its application in the field of profile control and water shutoff in low temperature reservoirs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] At the same time, the present invention also provides a preparation method of the above-mentioned profile control and water shutoff system, the preparation method includes the following steps: using injected water to dissolve and hydrolyze polyacrylamide to obtain a polyacrylamide solution; Add paraformaldehyde, resorcinol and m-phenylenediamine, and stir evenly to obtain a profile control and water shutoff system.

[0022] The profile control and water shutoff agent system formed by the above preparation method has the characteristics of controllable gelation time and gel strength and good long-term stability, and is suitable for profile control and plugging in oil layers at low temperatures, especially oil reservoirs with reservoir temperatures below 40°C water. The profile control water shutoff agent does not contain components such as retarding crosslinking agent, oxygen scavenger or pH regulator, thus simplifying the formulation components of the profile control wa...

Embodiment 1

[0028]This embodiment provides a low-temperature gel-forming controllable profile control and water shutoff system and its preparation method. In terms of weight percentage, the profile control and water shutoff system includes: 0.15% hydrolyzed polyacrylamide, 0.05% paraformaldehyde, 0.005% resorcinol, 0.002% m-phenylenediamine and 99.7% water.

[0029] The preparation method comprises the following steps: adding hydrolyzed polyacrylamide according to the ratio while stirring in tap water, and obtaining a polyacrylamide solution after standing and aging for 5 hours; adding paraformaldehyde, resorcinol and m-phenylenediamine, after stirring evenly, the profile control water shutoff agent is obtained.

[0030] Test: at a temperature of 25°C and a shear rate of 1S -1 Under the condition of , adopt HAAKE rheometer to measure. The test results show that the gelling time is 24 hours, the viscosity is 2879mPa.s when gelling, and the viscosity retention rate of 90d is 93.5%.

Embodiment 2

[0032] This embodiment provides a low-temperature gel-forming controllable profile control and water shutoff system and its preparation method. In terms of weight percentage, the profile control and water shutoff system includes: 0.4% hydrolyzed polyacrylamide, 0.3% paraformaldehyde, 0.02% resorcinol, 0.005% m-phenylenediamine and 99.3% water.

[0033] The preparation method comprises the following steps: adding hydrolyzed polyacrylamide according to the ratio while stirring in tap water, and obtaining a polyacrylamide solution after standing and aging for 5 hours; adding paraformaldehyde, resorcinol and m-phenylenediamine, after stirring evenly, the profile control water shutoff agent is obtained.

[0034] Test: at a temperature of 25°C and a shear rate of 1S -1 Under the condition of , adopt HAAKE rheometer to measure. The test results show that the gelling time is 6 hours, the viscosity is 13020mPa.s, and the viscosity retention rate of 90d is 95.4%.

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Abstract

The invention discloses a profile control and water plugging system with controllable low temperature gelatinizing and a preparation method thereof, and a profile control and water plugging method. The profile control and water plugging system comprises the following raw materials by the weight percentage: 0.15-0.4% of hydrolyzed polyacrylamide, 0.05-0.3% of polyformaldehyde, 0.005-0.02% of resorcinol, 0.002-0.005% of m-phenylenediamine, and 99.2%-99.8% of water. The hydrolyzed polyacrylamide, the polyformaldehyde and the resorcinol in the profile control and water plugging system can be slowly subjected to a crosslinking reaction under a low-temperature condition of 20-40 DEG C; when the coagulation accelerator m-phenylenediamine is added, the crosslinking reaction speed is accelerated, and through changing the concentration of the m-phenylenediamine, the gelatinizing time and the gel strength are adjusted. Therefore, the profile control and water plugging system has the characteristics of controllable gelatinizing time and gel strength and good long-term stability. The method for preparing the profile control and water plugging system is simple and easy to implement, and transportation and field preparation are convenient, and the economic benefits are good.

Description

technical field [0001] The invention relates to the technical field of profile control and water shutoff, in particular to a profile control and water shutoff system with controllable low-temperature gelation, a preparation method thereof, and a profile control and water shutoff method. Background technique [0002] At present, most oil fields have entered the high water-cut and ultra-high water-cut development period. The heterogeneity of the reservoir and the long-term water injection development lead to further aggravation of the heterogeneity, and the low-efficiency and ineffective circulation of the injected water in the high-permeability channel , which seriously affects the water flooding development effect. As an important technical means to improve the development effect of water flooding and realize stable production of reservoirs, profile control and water shutoff have been successfully applied in high water-cut oilfields at home and abroad. [0003] Polymer jell...

Claims

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Application Information

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IPC IPC(8): C09K8/508E21B33/13
Inventor 罗强宫兆波吴运强唐可王凤清汪进原风刚
Owner PETROCHINA CO LTD
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