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A kind of polymer-ionic liquid composite clay stabilizer and its synthesis method

A technology of composite clay and synthesis method, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of not being able to use clay stabilizers, not being resistant to erosion, and not being widely used, and achieving good temperature resistance and shear resistance. Cutting ability, good viscosity retention ability, the effect of inhibiting hydration swelling

Inactive Publication Date: 2016-06-08
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main advantage of this type of clay stabilizer is that it is cheap and easy to get, but it is not resistant to erosion, and it cannot produce multi-point adsorption, so it cannot be widely used (E.S.Boek, P, V, Coveney, N.T.Skipper. MonteCarloMolecularModelingStudiesofHydratedLi + , Na + , and K + Smectites:UnderstandingtheRoleofPotassiumasaClaySwellingInhibitor[J].J.Am.Chem.Soc.,1995,117(50):12608-12617;PennerD,LadalyG.InfluenceofOrganicandInorganicSaltsontheCoagulationofMontmorilloniteDispersions[J].ClaysandClayMinerals,2000,48(2):246-255.) (2) Cationic surfactant: its adsorption is strong, and it can resist water washing, but it will make the reservoir become lipophilic and reduce the relative permeability of the oil-gas phase, so it cannot be used as an effective clay stabilizer (JhonK. Borchardt, Duncan, Okla.Methodsofminimizingfinesmigrationinsubterraneanformations.US4536304,1985(02)); (3) organic cationic polymer: mainly quaternary ammonium salt type

Method used

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  • A kind of polymer-ionic liquid composite clay stabilizer and its synthesis method
  • A kind of polymer-ionic liquid composite clay stabilizer and its synthesis method
  • A kind of polymer-ionic liquid composite clay stabilizer and its synthesis method

Examples

Experimental program
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Embodiment 1

[0020] Example 1: Polymer-ionic liquid complex AA / AM / DMAAPA-[EMIM]BF 4 Synthesis

[0021] (1) Add 0.03gDMAAPA, 6.97gAM, and 3.00gAA into a 250mL three-necked flask to form an aqueous solution with a total monomer mass concentration of 20%, adjust the pH to 7 with NaOH (2M), and inject N 2 20min; Add initiator ammonium persulfate-sodium bisulfite then, its mol ratio is 1:1, and initiator add-on is 0.3% of total monomer mass, continues to pass into N 2 10-20min, and react at a temperature of 45°C for 8h; finally wash three times with absolute ethanol, pulverize, and dry to obtain the ternary polymer AA / AM / DMAAPA.

[0022] (2) Get newly steamed 1-methylimidazole and bromoethane each 0.05mol to be dissolved in 50mL n-heptane, join in the three-necked flask successively, under N 2Under a protective atmosphere, heat to 80°C and stir to reflux. After 18 hours, remove the reaction device and cool to room temperature. The light yellow viscous liquid in the lower layer was taken out ...

Embodiment 2

[0024] Example 2: Polymer-ionic liquid complex AA / AM / DMAAPA-[EMIM]BF 4 Infrared Spectroscopy Characterization of

[0025] The polymer-ionic liquid complex AA / AM / DMAAPA-[EMIM]BF synthesized by Example 1 4 The infrared spectrum is shown in 1. Comparison of polymer AA / AM / DMAAPA and polymer-ionic liquid complex AA / AM / DMAAPA-[EMIM]BF from the figure 4 , it can be seen that at 3300cm -1 There are strong amino stretching vibration absorption peaks on the left and right, 2915cm -1 、2850cm -1 There are vibration absorption peaks of methylene on the left and right, 1650cm -1 Left and right are the absorption peaks of carbonyl, 1100cm -1 is the stretching vibration absorption peak of the phosphorus-oxygen double bond; but by comparison, it can be seen that the polymer-ionic liquid complex AA / AM / DMAAPA-[EMIM]BF 4 at 3158cm -1 、3108cm -1 Double peaks appear at , which is caused by the stretching vibration absorption of the ethyl group on the imidazole ring, 1182cm -1 is the absor...

Embodiment 3

[0026] Example 3: Polymer-ionic liquid complex AA / AM / DMAAPA-[EMIM]BF 4 Temperature resistance investigation

[0027] The temperature resistance of the samples synthesized in Example 1 was investigated. The prepared polymer-ionic liquid complex AA / AM / DMAAPA-[EMIM]BF 4 Prepare an aqueous solution of 1100 mg / L, measure the apparent viscosity change of the polymer aqueous solution at a temperature of 30-120 °C, and compare it with the aqueous solution of the terpolymer AA / AM / DMAAPA with a mass concentration of 1000 mg / L. The data Such as figure 2 shown. from figure 2 It can be found that the apparent viscosity of the polymer-ionic liquid complex aqueous solution and the terpolymer aqueous solution gradually decreases with the increase of temperature. When the temperature increased to 120 °C, the polymer-ionic liquid complex AA / AM / DMAAPA-[EMIM]BF 4 The apparent viscosity of the terpolymer AA / AM / DMAAPA is 36.1mPa·s, and the viscosity retention rate reaches 51.8%, and the vis...

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Abstract

The invention discloses a polymer-ionic liquid composite clay stabilizer and a synthesis method, comprising the following steps: a ternary obtained by copolymerizing (1-dimethylamino)-allyl phosphoric acid containing a phosphoric acid group with acrylic acid and acrylamide The copolymer AA / AM / DMAAPA was prepared into 100mL aqueous solution with a mass concentration of 10000mg / L, placed in a 250mL round bottom flask, and 0.3g of ionic liquid [EMIM]BF was added 4 , pass N 2 10-20min, reflux reaction at 50°C for 2-4h, after the reaction, the reaction solution is distilled under reduced pressure at 50°C until a gelatinous product is formed. The product was dried in an oven at 60°C for 12h to obtain the polymer-ionic liquid complex AA / AM / DMAAPA-[EMIM]BF 4 . The invention synthesizes a polymer-ionic liquid composite clay stabilizer intended to be used for inhibiting clay hydration expansion in oilfield development.

Description

technical field [0001] The invention relates to a polymer-ionic liquid compound used as a clay stabilizer in the petroleum industry and a synthesis method thereof. technical background [0002] With the continuous exploration and development of oil fields, the protection of reservoirs is becoming more and more important. Clay minerals widely exist in oil reservoirs. If proper measures are not taken during the development process, hydration expansion and dispersion migration of clay minerals will be caused, pores and channels will be blocked, permeability will be reduced, and reservoirs will be damaged. To mitigate damage to the reservoir, chemical treatments must be used to stabilize the clay minerals in the formation. [0003] At present, the commonly used clay stabilizers at home and abroad roughly contain the following classes (J.Swenson, M.V.Smalley, H.L.M.Hatharasinghe, et al. Interlayer Structure of a Clay-Polymer-Salt-Water System. Langmuir [J]. .): (1) Inorganic sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F230/02C08F8/44C09K8/575C09K8/44
Inventor 苟绍华周艳婷杨成尹婷刘曼何珍艳
Owner SOUTHWEST PETROLEUM UNIV
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