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Core-shell polyacrylamide microsphere profile controlling oil displacement agent and preparation method thereof

A technology of polyacrylamide and profile control oil displacement agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of rapid failure, large particles, poor controllability of movable weak gel crosslinking, etc. Achieve the effect of good injection performance and simple injection process

Active Publication Date: 2014-04-23
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional inorganic profile control agent is easy to precipitate and cannot enter the deep formation for plugging, the movable weak gel has poor cross-linking controllability, high cost, and the water-swellable polymer gel particles are large, so there is a contradiction between injection depth and plugging strength , failure is faster; polymer microsphere deep profile control technology is a new type of deep profile control technology developed to solve the above contradictions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Microsphere preparation experiment

[0036] Weigh successively 1g (1%) of acrylamide, 3g (3%) of N,N'-dimethylaminoethylacrylic acid hydrochloride, 0.32g (8%) of divinylbenzene, 0.043g (1 %) of azobisisobutyronitrile, 0.1g (0.1%) of polyethylene glycol, add ethanol and butanol mixed solvent to 100g, wherein the ratio of ethanol to butanol is 4:6, fully stirred until completely dissolved; 1 / 3 of the solution was added to the reaction vessel, and N was introduced into the solution 2 Evacuate for 0.5h, control the temperature at 40°C, and stir at a speed of 300r / min; then react at a constant temperature for 3h; obtain a prepolymer solution; control the above reaction conditions unchanged, add the remaining solution evenly to the reaction system, and continue to react for 3h ; The white solid is constantly increasing, and the microsphere core mixture is obtained;

[0037]Weigh 0.6g (1%) of azobisisobutyronitrile, add a mixed solvent of ethanol and butanol to 10g, wherein ...

Embodiment 2

[0042] Microsphere preparation experiment

[0043] Weigh successively 7g (10%) of acrylamide, 0.7g (1%) of dimethyl diallyl ammonium chloride, 0.154g (2%) of N,N'-methylenebisacrylamide, 0.235 g (3%) of benzoyl peroxide, 0.7g (1%) of castor oil polyoxyethylene ether, add cyclohexane to 70g, fully stir until completely dissolved; add 1 / 3 of the solution into the reaction vessel, N was introduced into the solution 2 Evacuate for 0.5h, control the temperature at 60°C, and stir at a speed of 200r / min; then react at a constant temperature for 3h; obtain a prepolymer solution; control the above reaction conditions unchanged, add the remaining solution evenly to the reaction system, and continue to react for 3h ; The white solid is constantly increasing, and the microsphere core mixture is obtained;

[0044] Weigh 0.436g (3%) of benzoyl peroxide, add cyclohexane to 5g, fully stir until completely dissolved and add to the microsphere core mixture, control the reaction conditions unc...

Embodiment 3

[0049] Microsphere preparation experiment

[0050] Weigh successively 20g (40%) of acrylamide, 5g (10%) of N,N'-dimethylamino ethyl ethacrylate, 0.75g (3%) of polyethylene glycol diacrylate, 0.003g (0.01%) benzoyl peroxide, 2g (4%) polyvinyl alcohol, add toluene to 50g, fully stir until fully dissolved; 1 / 3 of the solution is added to the reaction vessel, and N is passed into the solution 2 Evacuate for 0.5h, control the temperature at 80°C, and stir at a speed of 200r / min; then react at a constant temperature for 3h; obtain a prepolymer solution; control the above reaction conditions unchanged, add the remaining solution evenly to the reaction system, and continue to react for 3h ; The white solid is constantly increasing, and the microsphere core mixture is obtained;

[0051] Take by weighing 0.003g (0.01%) of benzoyl peroxide, add toluene to 10g, fully stir until fully dissolved and join in the microsphere core mixture, control the reaction conditions constant, constant te...

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Abstract

The invention discloses a core-shell polyacrylamide microsphere profile controlling oil displacement agent and a preparation method thereof. The method comprises the following steps: fully stirring and dissolving acrylamide, cationic monomer, a crosslinking agent and an initiator to synthetize a core part by adopting a dispersion polymerization method; fractionally adding a mixed solution of the acrylamide, anionic monomer, third monomer, the crosslinking agent and the initiator into a reaction device, controlling reaction conditions to be invariant, and reacting on the surface of the core to generate a shell part, thereby obtaining the core-shell polyacrylamide microsphere profile controlling oil displacement agent taking the cationic polyacrylamide as the core and taking the anionic polyacrylamide polymerized on the surface of the core as the shell, wherein the particle size range of the microsphere profile controlling oil displacement agent is from 1micrometer to100 micrometers. The microsphere profile controlling oil displacement agent has the advantages that the microsphere has an interpenetrating polymer network system and is capable of forming a viscoelastic body after absorbing water and forming a gel body after a certain time, so that the oil displacement agent is long in plugging time and little in leakage and is capable of bearing the pressure of more than 5MPa.

Description

technical field [0001] The invention relates to a core-shell structure polyacrylamide microsphere profile control oil displacement agent and a preparation method. Background technique [0002] Due to the lithological changes of formations in most domestic oil production areas, the development of pores, fractures, and karst caves are different, the causes of lost circulation are complex, the types of loss are different, and there are many restrictive factors, and the plugging technology is highly targeted. So far, it is difficult to use a general The mode is used for leak prevention and plugging. In particular, the problem of lost circulation in fractured formations is more serious. According to incomplete statistics, the domestic reserves of fractured and complex formations account for about 50% of the total reserves. However, due to the development of formation fractures and holes, the leakage problem is difficult to solve, resulting in extremely serious losses. Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34C08F212/08C08F220/58C08F226/02C08F220/18C08F226/06C08F220/06C08F220/14C08F2/26C08F2/30C09K8/588
Inventor 刘晓非吴晓乐李俊霖李景龙金鑫
Owner TIANJIN UNIV
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