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Copolymer elastic gel type profile control agent for chemical oil recovery of oilfield

A chemical oil recovery and elastic gel technology, which is applied to chemical instruments and methods, drilling compositions and other directions, can solve the problems of reducing oil well single well production, oil well production capacity, and production stimulation validity period, etc., so as to improve oil displacement efficiency. , Long glue forming time, improve the effect of sweeping efficiency

Active Publication Date: 2019-08-20
黑龙江益瑞化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The intrusion in the injected water layer, especially the high permeability layer, is more serious. The reduction in sweep efficiency is due to the heterogeneity of the reservoir and the unfavorable oil-water mobility ratio, which in turn reduces the production capacity of the oil well. Single well production, increase oil well water cut
For high-permeability reservoirs, even after profile control, the liquid injected later can still skip the plugging area and enter the high-permeability layer, which reduces the effective period of production stimulation and its effect will become worse, so the result of profile control will directly affect oil well production

Method used

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Examples

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Effect test

preparation example Construction

[0056] In one embodiment, the preparation method of the above-mentioned copolymer elastic gel type profile control agent for oilfield chemical oil recovery comprises the following steps:

[0057] Under the condition of normal temperature and normal pressure, water and polymer are sequentially added to the reaction kettle according to the weight part and stirred and mixed, and then crosslinking agent and stabilizer are added successively and stirred and mixed, and then additives are added and stirred for 2-3 hours to obtain the oilfield chemical oil recovery product Copolymer elastic gel type profile control agent.

[0058] In one embodiment, the preparation method of the above-mentioned copolymer elastic gel type profile control agent for oilfield chemical oil recovery comprises the following steps:

[0059] Under the condition of normal temperature 5-45℃ and normal pressure, add water and polymer to the reactor according to the weight and stir and mix for 5-15 minutes, then a...

Embodiment 1

[0063] The copolymer elastic gel type profile control agent for oil field chemical oil recovery comprises the following raw materials in parts by weight: 3.5 parts of polymer, 0.9 part of crosslinking agent, 0.15 part of stabilizer, 0.9 part of additive and 1000 parts of water.

[0064] The preparation monomer of the polymer is composed of acrylamide, methacrylamide, and vinyloxybenzenesulfonic acid, and the molar ratio of the acrylamide, methacrylamide, and vinyloxybenzenesulfonic acid is 3:0.9 : 0.5.

[0065] The preparation method of described polymer is:

[0066] (1) Add vinyloxybenzenesulfonic acid into a wide-mouthed bottle, dissolve it with an appropriate amount of deionized water, neutralize it with sodium hydroxide in an ice-water bath, adjust the pH value to 7.5, and stir slowly to dissolve it completely; weigh it accurately Take acrylamide and methacrylamide and dissolve them with an appropriate amount of deionized water; mix the above two solutions, add deionized ...

Embodiment 2

[0075] The copolymer elastic gel type profile control agent for oil field chemical oil recovery comprises the following raw materials in parts by weight: 3.5 parts of polymer, 0.9 part of crosslinking agent, 0.15 part of stabilizer, 0.9 part of additive and 1000 parts of water.

[0076] The preparation monomer of the polymer is composed of acrylamide, methacrylamide, and vinyloxybenzenesulfonic acid, and the molar ratio of the acrylamide, methacrylamide, and vinyloxybenzenesulfonic acid is 3:0.9 : 0.1.

[0077] The preparation method of described polymer is:

[0078] (1) Add vinyloxybenzenesulfonic acid into a wide-mouthed bottle, dissolve it with an appropriate amount of deionized water, neutralize it with sodium hydroxide in an ice-water bath, adjust the pH value to 7.5, and stir slowly to dissolve it completely; weigh it accurately Take acrylamide and methacrylamide and dissolve them with an appropriate amount of deionized water; mix the above two solutions, add deionized ...

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Abstract

The invention discloses a copolymer elastic gel type profile control agent for chemical oil recovery of an oilfield, and belongs to the field of oil field application chemical agents. The copolymer elastic gel type profile control agent for chemical oil recovery of the oilfield comprises a polymer, a crosslinker, a stabilizer, an additive and water. The profile control agent has the advantages oflong gel formation time, penetration deep into the oil layer, strong plugging property, good stability, high compressive strength, long effective period, slowness in moving deep into the formation, good shear resistance, good elasticity, effectiveness in plugging of large pores and cracks of the oil reservoir, dynamic spreading effect, good dual effects of profile control and oil displacement, simplicity in preparation, good resistance to the temperature and salt, convenience in construction, and small pollution to non-target layers.

Description

technical field [0001] The invention belongs to the technical field of oilfield applied chemical agents, and in particular relates to a copolymer elastic gel type profile control agent for chemical oil recovery in oilfields. Background technique [0002] Due to the heterogeneity of the reservoir, the injected water will preferentially form fingering flow along the high-permeability layer and large pores, so that the oilfield will quickly enter the high water-cut or ultra-high water-cut development period. Moreover, with the prolongation of the water flooding period, due to the erosion of the formation by the injected water, the heterogeneity of the reservoir further deteriorates, making the porosity and permeability of the formation more and more large, forming the so-called "secondary large pores". . At this time, the simple plugging of the near-wellbore area can no longer overcome the bypass flow of injected water (bypassing the plugged layer and entering the high permeab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508C09K8/58
CPCC09K8/512C09K8/588
Inventor 李明星
Owner 黑龙江益瑞化工有限公司
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