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Flexible particles for profile control, and preparation method thereof

A technology of flexible particles and profile control, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of small expansion ratio, inability to penetrate into the formation, unable to play a plugging role, etc., and achieve the effect of high expansion ratio

Active Publication Date: 2017-05-10
西安长庆化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the flexible particles used at home and abroad have a large particle size. For low-permeability and ultra-low-permeability oil fields with small pore radius, they cannot go deep into the formation and cannot achieve the effect of deep profile control. Micro cracks and large pores cannot play a good plugging role

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A flexible particle for profile control, characterized in that it at least includes water-phase substances and oil-phase substances, and the weight ratio of water-phase substances to oil-phase substances is 35:65-25:75;

[0038] Described aqueous phase material is made up of following components by weight:

[0039] Water 70.77~82.70 parts;

[0040] Acrylamide 15.0~25.0 parts;

[0041] 1.0-2.0 parts of acrylic acid;

[0042] N,N-methylenebisacrylamide 0.6~0.9 part;

[0043] 0.6-1.2 parts of sodium hydroxide;

[0044] Potassium persulfate 0.02 to 0.03 parts;

[0045] Azobisisobutylamidine hydrochloride 0.08~0.10 parts;

[0046] Described oil phase substance is made up of following components by weight:

[0047] 97.71-98.83 parts of n-butane;

[0048] Span80 1.0~2.0 parts;

[0049] Tween80 0.05~0.1 parts;

[0050] 0.01 to 0.02 parts of hydrogenated polyisoprene;

[0051] Cetyl polyethylene glycol 0.01~0.02 parts.

[0052] A method for preparing flexible particle...

Embodiment 2

[0060] Step 1: Place the four-necked flask equipped with a thermometer, stirrer, condensing device, and nitrogen tube in a constant temperature water bath, and add 70.77 parts by weight of water and 25.0 parts by weight of Parts of acrylamide, 2.0 parts by weight of acrylic acid, 0.9 parts by weight of N,N-methylenebisacrylamide, after the contents in the four-necked flask are completely dissolved and stirred evenly, add 1.2 parts by weight of sodium hydroxide to adjust the pH value to 7.5 ;

[0061] Step 2: Take another flask and add 98.83 parts by weight of n-butane, 1.0 parts by weight of Span80, 0.05 parts by weight of Tween80, 0.01 parts by weight of hydrogenated polyisoprene, and 0.01 parts by weight of cetyl polyethylene glycol into the flask , and mix well;

[0062] Step 3: Into the solution in Step 1, nitrogen gas was passed into the solution for 20 minutes, and 0.10 parts by weight of azobisisobutyramide hydrochloride and 0.03 parts by weight of potassium persulfate...

Embodiment 3

[0072] Step 1: Place a four-necked flask equipped with a thermometer, a stirrer, a condensing device, and a nitrogen tube in a constant temperature water bath, and add 70.77 parts by weight of water and 25.0 parts by weight of propylene to the four-necked flask under stirring conditions in a water bath at 30°C Amide, 2.0 parts by weight of acrylic acid, and 0.9 parts by weight of N,N-methylenebisacrylamide. After the contents of the four-necked flask are completely dissolved and stirred evenly, 1.2 parts by weight of sodium hydroxide are added to adjust the pH value to 7.5;

[0073] Step 2: Take another flask and add 97.71 parts by weight of n-butane, 2.0 parts by weight of Span80, 0.1 parts by weight of Tween80, 0.02 parts by weight of hydrogenated polyisoprene, and 0.02 parts by weight of cetyl polyethylene glycol into the flask , and mix well;

[0074] Step 3: Into the solution in Step 1, nitrogen gas was passed into the solution for 20 minutes, and 0.10 parts by weight of ...

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Abstract

The present invention provides flexible particles for profile control, and a preparation method thereof. The flexible particles at least comprise a water phase substance and an oil phase substance according to a weight ratio of 35:65-25:75, wherein the water phase substance comprises, by weight, 70.77-82.70 parts of water, 15.0-25.0 parts of acrylamide, 1.0-2.0 parts of acrylic acid, 0.6-0.9 part of N,N-methylenebisacrylamide, 0.6-1.2 parts of sodium hydroxide, 0.02-0.03 part of potassium persulfate, and 0.08-0.10 part of 2,2'-azobis(2-methylpropionamidine) dihydrochloride, and the oil phase substance comprises, by weight, 97.71-98.83 parts of n-butane, 1.0-2.0 part of Span 80, 0.05-0.1 part of Tween 80, 0.01-0.02 part of hydrogenated polyisoprene, and 0.01-0.02 part of cetyl polyethylene glycol. The flexible particles of the present invention have characteristics of small particle size, good expansion salt resistance, high expansion multiple, high separable solid content, and rapid dispersion.

Description

technical field [0001] The invention relates to a chemical agent used in the field of tertiary oil recovery, in particular to a flexible particle for profile control and a preparation method thereof. Background technique [0002] At present, profile control of water injection wells is one of the important measures to control water and stabilize production of oil wells. Its essence is to inject polymer gels, inorganic and organic particles, etc. into the formation to plug pores and fractures, change the direction of liquid flow, and improve water absorption profiles. Increase the affected area, so as to control water and stabilize production. Flexible particles have a certain elastic deformation ability, and will not be blocked at the pore throat. Under the action of pressure, they can deform through the pore throat, block the next pore throat of the seepage channel, and continue to play the role of redirecting the liquid flow. Such a process goes back and forth and graduall...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F222/38C09K8/508
Inventor 叶智杜彪朱趁安吕俊华赵燕红杨继刚李爱辉郝宗香张小荣张强曹效东
Owner 西安长庆化工集团有限公司
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