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Slow-expansion water-absorbable salt-resistant gel particle, and preparation and applications thereof

A technology of gel particles and slow expansion, which is applied in the direction of drilling compositions, chemical instruments and methods, etc. It can solve the problems of poor plugging, unstoppable plugging agent, prolonging the expansion time, etc., and achieves easy operation and adaptability Strong, low-cost effect

Inactive Publication Date: 2015-04-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particles can prolong the expansion time, enhance the water absorption performance of the gel, overcome the problems of rapid pressure rise, plugging agent failure and plugging in the process of profile control of water injection wells in low-permeability oilfields, and meet the actual needs of profile control of water injection wells in oilfields

Method used

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  • Slow-expansion water-absorbable salt-resistant gel particle, and preparation and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of slow swelling type strong water-absorbing gel particle, it is made up of the raw material of following percentage by weight:

[0028] A. Acrylamide monomer 12.5%;

[0029] B. Acrylic acid 4%;

[0030] C. Methylenebisacrylamide 0.05%;

[0031] D. 2-acrylamido-2-methylpropanesulfonic acid 0.05%

[0032] E. Ammonium persulfate 0.05%;

[0033] F. Clay 25%;

[0034] G. Sodium hydroxide 6%;

[0035] H. Sodium dodecylbenzenesulfonate 0.1%;

[0036] 1, water; Surplus is water.

[0037] The preparation method of the slow swelling type strong water-absorbing gel particles is as follows:

[0038] (1) Add raw materials B, G, and I into the reactor and stir for 10 minutes, and adjust the pH value to 7.0-8.0;

[0039] (2), then add the raw materials A, C, D, E, F, H into the reaction kettle and stir for 1-2 hours;

[0040] (3) Put the material into the reaction tank and heat it to 60°C, and react for 3-5 hours;

[0041] (4) Cut the reactants into pieces, dry them ...

Embodiment 2

[0043] A kind of slow swelling type strong water-absorbing gel particle, it is made up of the raw material of following percentage by weight:

[0044] A. Acrylamide monomer 15%;

[0045] B. Acrylic acid 4%;

[0046] C. Methylenebisacrylamide 0.05%;

[0047] D. Sodium styrene sulfonate 0.1%

[0048] E. Potassium persulfate 0.05%;

[0049] F. Starch 25%;

[0050] G. Sodium carbonate 8%;

[0051] H. Sodium dodecylbenzenesulfonate 0.1%;

[0052] 1, water; Surplus is water.

[0053] The preparation method of the slow swelling type strong water-absorbing gel particles is as follows:

[0054] (1) Add raw materials B, G, and I into the reactor and stir for 10 minutes, and adjust the pH value to 7.0-8.0;

[0055] (2), then add the raw materials A, C, D, E, F, H into the reaction kettle and stir for 1-2 hours;

[0056] (3) Put the material into the reaction tank and heat it to 60°C, and react for 3-5 hours;

[0057] (4) Cut the reactants into pieces, dry them in the sun, crush...

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Abstract

The invention relates to a slow-expansion water-absorbable salt-resistant gel particle, and preparation and applications thereof. The gel particle relates to crosslinked gel having a net structure and formed by reactions of following raw materials: A), an acrylamide monomer, B) acrylic acid, C) a crosslinking agent, D) a salt-resistant crosslinking agent, E) an initiator that is persulfate, F) a reinforcing agent, G) a pH value conditioning agent, H) a foaming agent and I) water. The gel particle is a gel particle modifying and flooding agent having slow expansion performance, strong water absorption performance and salt resistance. The gel particle slowly absorbs water and expands when encountering water, and along with construction, the gel particle blocks, in the deep stratum, cracks or large pores and channels, thus adjusting water absorption profiles, diverting liquid streams, reducing inert areas in oil deposits, increasing production of oil of an oil well, and achieving a function of increasing the oil recovery rate of the oil deposits. The gel particle is low in expansion in construction processes, so that pressure rise is small, and the gel particle is suitable for profile control of a water injection well having low permeability and high water injection pressure.

Description

technical field [0001] The invention relates to acrylamide monomer undergoing polymerization and cross-linking reaction to generate gel, which is prepared into gel particles. This gel particle has the properties of relatively slow water absorption expansion, large water absorption expansion multiple and good salt resistance, and can be used It is used in oilfield water well profile control and oil well water plugging. Background technique [0002] Waterflood fingering phenomenon often occurs in the process of water flooding development, the main reason is due to the heterogeneity of the reservoir. Due to the heterogeneity of the reservoir, the permeability varies greatly, and the injected water mainly enters the connected pores, fractures and high-permeability zones, which reduces the sweep coefficient of the injected water flooding oil, and the water content of the produced fluid continues to increase and decrease. The oil recovery efficiency and the ultimate recovery rate...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F212/14C08F2/44C09K8/58C09K8/42
Inventor 吴宗福邵东波陆红军王勇姚斌王守虎张随望陆小兵隋蕾陈阵王俊涛何汝贤王薇宋昭杰付文耀郑建刚
Owner PETROCHINA CO LTD
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