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A kind of polymer microsphere for profile control and water plugging in oil field and preparation method thereof

A technology for profile control and water plugging and polymer, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of inability to achieve deep and long-term profile control and water plugging, and the core-shell structure is too simple. The effect of convenient storage stability, excellent water swellability, and good swellability

Active Publication Date: 2018-05-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The first object of the present invention is to solve the problem that the core-shell structure of the existing core-shell polyacrylamide profile control and oil displacement microspheres is too simple, and the water-absorbing core is quickly released before reaching the required oil layer depth during use, and the depth and length cannot be achieved. effective profile control and water shutoff; the second purpose is to solve the problem of existing core-shell polyacrylamide profile control and oil displacement microspheres

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The invention provides a kind of adaptable, long-term and stable polymer microspheres for oilfield profile control and water shutoff and a preparation method of profile control water shutoff microspheres with simple process and large-scale industrialization, which can improve the development effect of oilfield water injection and reduce the Well group or block water cut rise rate, and achieve long-term oilfield stable production.

[0035] A polymer microsphere for oilfield profile control and water plugging, the polymer microsphere has a three-layer spherical structure, including a cationic inner core, a middle lipophilic shell, and an outer anionic hydrophilic shell from outside to inside.

[0036] A method for preparing polymer microspheres for oilfield profile control and water plugging, comprising the steps of:

[0037] Step 1, preparation of cationic core

[0038] Dissolving 10-40 parts by mass of acrylamide solid powder into 100 parts by mass of solvent, then addin...

Embodiment 2

[0054] (1) Preparation of cationic core

[0055] Dissolve 10 parts by mass of acrylamide solid powder in 100 parts by mass of methanol, then add 0.1 parts by mass of polyvinyl methyl ether, 0.01 parts by mass of divinylbenzene, and 0.01 parts by mass of sodium persulfate to keep the reaction The temperature is 40°C, the rotation speed is 100r / min, until it is completely dissolved into the mixed solution system I, and then 1 mass part of acryloyloxyethyltrimethylammonium chloride is added dropwise to the mixed solution system I, and the reaction time is 2 hours to obtain a mixed solution A;

[0056] The aforementioned methanol is used as a solvent, the dispersion stabilizer is selected from polyvinyl methyl ether, the crosslinking agent is selected from divinylbenzene, the initiator is selected from sodium persulfate, and the monomer I is selected from acryloyloxyethyltrimethylammonium chloride;

[0057] (2) Preparation of the middle oil-wet shell

[0058] Add 0.1 parts by ma...

Embodiment 3

[0069] (1) Preparation of cationic core

[0070] Dissolve 20 mass parts of acrylamide solid powder in 100 mass parts of ethanol, then add 4 mass parts of castor oil polyoxyethylene ether as dispersion stabilizer, 4 mass parts of diisocyanate as crosslinking agent, 3 mass parts of Potassium persulfate is used as an initiator, and the reaction temperature is kept at 48°C, and the rotation speed is 200r / min until it is completely dissolved into the mixed solution system I, and then 4 parts by mass of dimethyl diallyl ammonium chloride is added dropwise to the mixed solution system I (Monomer I), the reaction time is 2.5h, and the mixture A is obtained;

[0071] (2) Preparation of the middle oil-wet shell

[0072] Add 4 parts by mass of castor oil polyoxyethylene ether (dispersion stabilizer), 1 part by mass of coupling agent, 2 parts by mass of diisocyanate as crosslinking agent, 3 parts by mass of potassium persulfate in the above mixed solution A As an initiator, keep the rea...

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Abstract

The invention provides polymer microspheres for profile control and water plugging in oilfields and a preparation method thereof. The polymer microspheres have a three-layer spherical structure, including a cationic inner core, a middle lipophilic shell, and an outer anionic hydrophilic shell. The cationic inner core includes acrylamide, cationic monomer and crosslinker copolymer, the middle lipophilic shell layer includes acrylamide, lipophilic monomer and crosslinker copolymer, and the outer anionic hydrophilic shell layer includes acrylamide, anionic monomer and crosslinker copolymers. The polymer microspheres prepared by the present invention have a controllable particle size range of 1-500 μm. When in use, the outer hydrophilic shell and the middle lipophilic shell gradually degrade with the extension of the hydration time, and the inner core has excellent water absorption and swelling properties. Performance, the size after full expansion reaches 30~1500μm, with good expansion performance and strong plugging performance. The polymer microsphere of the present invention is a solid powder, which is convenient for storage and has good stability, and has a validity period of 3-5 years. It does not need to add other additives during use and can be quickly dispersed in a solvent.

Description

technical field [0001] The invention belongs to the technical field of oilfield enhanced oil recovery, and in particular relates to a polymer microsphere for oilfield profile control and water shutoff and a preparation method thereof. Background technique [0002] Profile control refers to controlling water production from water injection wells, and water plugging refers to controlling water production from oil wells. Profile control and water shutoff technology is an effective means for oilfields to improve the effect of water injection development and increase production of oil reservoirs. With the continuous deepening of oil exploitation in my country, major oilfields have entered high water cut periods one after another. As an important means of secondary and tertiary oil recovery, Profile control and water shutoff technology has been widely used in various oilfields. [0003] Traditional inorganic profile control agents are easy to precipitate and cannot enter deep form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F285/00C08F220/56C08F212/36C08F220/06C08F265/10C08F220/18C08F220/34C08F222/14C08F226/04C08F228/02C08F222/38C08F224/00C08F226/02C08F212/14C08F230/08C08G81/02C08J3/14C09K8/512C09K8/516
CPCC09K8/512C09K8/516C08F220/56C08F265/10C08F283/065C08F285/00C08G81/025C08J3/14C08J2351/00C08F212/36C08F220/34C08F226/04C08F226/02C08F220/585C08F222/102C08F222/1006C08F220/1804C08F212/14C08F230/08
Inventor 郑力军李宪文贾玉琴徐春梅杨海恩黎晓茸薛芳芳任建科张荣张涛朱家杰
Owner PETROCHINA CO LTD
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