Polymer microsphere for oil field profile control and water plugging and preparation method thereof

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

Active Publication Date: 2016-07-20
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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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The invention provides a kind of adaptable, long-term stable polymer microspheres for profile control and water shutoff in oilfields 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 core, a middle oil-wet shell, and an outer anion-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 adding 0.1-10 pa...

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 a polymer microsphere for oil field profile control and water plugging and a preparation method thereof. The polymer microsphere is of a three-layer spherical structure, and comprises a positive ion inner core, a middle oleophilic casing layer and an outer layer negative ion hydrophilic casing layer, wherein the positive ion inner core comprises acrylamide, cationic monomers and crosslinking agent copolymers; the middle oleophilic casing layer comprises acrylamide, oleophilic monomers and cross linking copolymers; the outer layer negative ion hydrophilic casing layer comprises acrylamide, anionic monomers and crosslinking agent copolymers. The polymer microsphere prepared according to the invention has the advantages that the particle diameter range is controllable in the dimension range of 1 to 500 mu. m; in the use process, the outer hydrophilic casing layer and the middle oleophilic casing layer are gradually degraded along with the prolonging of the water dissolution time; the inner core has good water absorption expansion performance; the dimension after the sufficient expansion reaches 30 to 1500 mu. m; good expansion performance and good plugging performance are realized. The polymer microsphere is solid powder; the storage is convenient; the stability is high; the validity period is 3 to 5 years; in the use process, the addition of other auxiliary agents is not needed; the polymer microsphere can be fast dispersed in the 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 Applications(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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