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Water glass inorganic gel plugging agent as well as preparation and using methods thereof

A technology of inorganic gel and water glass, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of application limitations, short gelation time, failure of profile control and water blocking measures, etc.

Inactive Publication Date: 2014-03-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has the problem of short gelation time. Generally, it can only treat formations around 1.5-3.0m in diameter, and the higher the formation temperature is, the shorter the gelation time is, and a large amount of dehydration condensation will form a dense glass body at high temperature, resulting in adjustment. Water plugging measures fail
Therefore, it has a certain application space in oilfield development, but is limited by application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In 50 g of polyacrylamide aqueous solution with a mass fraction of 0.2%, add 0.1 g of sodium dodecylbenzenesulfonate, 0.1 g of aluminum dihydrogen phosphate, and 1 g of N, N-dimethylformamide in sequence while stirring. The materials were stirred for 5 to 10 minutes, and finally 10 g of water glass solution and 38.8 g of water were added, and after stirring for 10 min, a water glass inorganic gel plugging regulator was formed; the components of the obtained water glass inorganic gel plugging modifier were (by mass ratio Total): 10% water glass + 0.1% polyacrylamide + 0.1% sodium dodecylbenzene sulfonate + 0.1% aluminum dihydrogen phosphate + 1% N, N-dimethylformamide + 88.7% water. The gel time of the system was 106 hours at an ambient temperature of 60°C, 32 hours at an ambient temperature of 120°C, and 10 hours at an ambient temperature of 150°C.

Embodiment 2

[0024] In 50 g of polyacrylamide aqueous solution with a mass fraction of 0.4%, 0.15 g of sodium dodecylbenzenesulfonate, 0.2 g of aluminum dihydrogen phosphate, and 3 g of N, N-dimethylformamide were sequentially added while stirring. The materials were stirred for 5 to 10 minutes, and finally 20 g of water glass solution and 26.65 g of water were added, and after stirring for 10 min, a water glass inorganic gel plugging regulator was formed; the components of the obtained water glass inorganic gel plugging regulator were (by mass ratio Total): 20% water glass + 0.2% polyacrylamide + 0.15% sodium dodecylbenzene sulfonate + 0.2% aluminum dihydrogen phosphate + 3% N, N-dimethylformamide + 76.45% water, the system The gel time was 75 h at an ambient temperature of 60°C, 23 h at an ambient temperature of 120°C, and 8 h at an ambient temperature of 150°C.

Embodiment 3

[0026] In 50 g of polyacrylamide aqueous solution with a mass fraction of 0.6%, 0.2 g of sodium dodecylbenzenesulfonate, 0.3 g of aluminum dihydrogen phosphate, and 6 g of N, N-dimethylformamide were added successively while stirring. The materials were stirred for 5-10 minutes, and finally 40 g of water glass solution and 3.5 g of water were added, and after stirring for 10 min, a water glass inorganic gel plugging agent was formed; the components of the obtained water glass inorganic gel plugging agent were (according to mass ratio Total): 40% water glass + 0.3% polyacrylamide + 0.2% sodium dodecylbenzene sulfonate + 0.3% aluminum dihydrogen phosphate + 6% N, N-dimethylformamide + 53.2% water, the system The gel time was 29 h at an ambient temperature of 60°C, 8 h at an ambient temperature of 120°C, and 5 h at an ambient temperature of 150°C.

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Abstract

The invention relates to a plugging agent and specifically relates to a water glass inorganic gel plugging agent as well as preparation and using methods thereof. The product comprises the following components in percentage by weight: 10-40% of water glass, 0.1-0.3% of polyacrylamide, 0.1-0.2% of sodium dodecyl benzene sulfonate, 0.1-0.3% of aluminum dihydrogen phosphate, 1-6% of N, N-dimethylformamide and the balance of water. The preparation method comprises the following steps: adding the water into a container, opening a stirring device, adding the polyacrylamide, curing for 10-15min, then sequentially adding the sodium dodecyl benzene sulfonate, the aluminum dihydrogen phosphate, the N, N-dimethylformamide and the water glass, stirring for 5-10min when one material is added, and continuously stirring for 10-15min after the end of adding of all the materials to obtain the water glass inorganic gel plugging agent. Compared with the prior art, the water glass inorganic gel plugging agent can be used for high-temperature and medium and low-permeability oil deposits, and has the characteristics of low initial viscosity and easiness in injection.

Description

technical field [0001] The invention relates to a plugging agent, in particular to a water glass inorganic gel plugging agent and its preparation and use method. Background technique [0002] In the middle and late stage of oilfield development, with continuous strong injection and strong production, the heterogeneity of the reservoir will generally increase, the difference in permeability will increase, and the high permeability zone will further develop into large pores, which will reduce the effect of water injection and polymer injection Or cause oil well flooding or channeling. In order to improve the effect of water injection and chemical flooding, and increase the production degree of reserves in low-permeability areas, profile control of water wells and water plugging of oil wells have become a very important measure. [0003] The profile control and water shutoff agents currently used in oil fields are mainly organic systems, which not only have high cost, but also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC09K8/5045C09K8/506C09K8/5083
Inventor 郭吉清李良川郑家朋卢淑芹宋立平颜菲薛海喜左刘朋吴佐浩李巧
Owner PETROCHINA CO LTD
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