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A pre-crosslinked gel slow-swelling microsphere profile control agent and its preparation method and application

A technology of pre-crosslinking and profile control agent, used in chemical instruments and methods, drilling compositions, etc.

Active Publication Date: 2019-01-18
DONGYING FANGLI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] As mentioned above, although a variety of profile control agents and their preparation methods are disclosed in the prior art, with the increasing complexity of oil well geological conditions and the decreasing oil recovery rate, for new profile control water plugging and oil displacement agents There is also an urgent need

Method used

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  • A pre-crosslinked gel slow-swelling microsphere profile control agent and its preparation method and application
  • A pre-crosslinked gel slow-swelling microsphere profile control agent and its preparation method and application
  • A pre-crosslinked gel slow-swelling microsphere profile control agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0076] Preparation Example 1: Preparation of Polyacrylic Acid Graft Prepolymer

[0077] A1: Heat the aqueous solution of polyvinyl alcohol with a concentration of 2% by mass to 85°C, add a solution of polyethylene glycol 6000 with a concentration of 0.5% by mass and stir to dissolve (wherein, the aqueous solution of polyvinyl alcohol with a concentration of 2% by mass is mixed with Mass percent concentration is 0.5% polyethylene glycol 6000 aqueous solution weight ratio is 1:2.5), then add the glycerol that is 0.6% polyvinyl alcohol weight and stir to dissolve (the weight of glycerin is the polyvinyl alcohol in the polyvinyl alcohol aqueous solution 0.6% by weight), to obtain mixture I;

[0078] A2: Dilute acrylic acid with deionized water to a mass percent concentration of 9%, add NaOH aqueous solution (wherein the molar ratio of acrylic acid to NaOH is 1:0.6), and react at room temperature for 15 minutes. After the reaction, adjust the reaction system. pH value is 8-9, obta...

preparation example 1-1

[0080] Preparation Example 1-1: Preparation of Polyacrylic Acid Graft Prepolymer

[0081] Except that no sodium metabisulfite was added in step A3, other operations remained unchanged, so the operation of Preparation Example 1 was repeated, and the obtained polyacrylic acid grafted prepolymer was named JBX1.

preparation example 2

[0082] Preparation Example 2: Preparation of Modified Kaolin Powder

[0083] B1: Calcining kaolin at 550° C. for 50 minutes, then naturally cooling to room temperature, and crushing to a particle size of 10-15 nm to obtain heat-treated kaolin powder;

[0084] B2: Spray atomized simethicone oil into heat-treated kaolin powder (wherein the mass ratio of heat-treated kaolin powder to atomized simethicone oil is 1:0.08), and fully mix to obtain oil-based kaolin, then The oil-based kaolin is added to an appropriate amount of absolute ethanol, and then the coupling agent succinyl-bis(trimethoxysilylpropyl sulfide) is added (wherein, the mass ratio of the heat-treated kaolin powder to the coupling agent is 1: 0.02), and fully stirred at 40°C for 35 minutes, and stood overnight to obtain a mixed solution;

[0085] B3: Centrifuge the mixed solution, and wash the obtained solid with ethyl acetate and acetone for 2-3 times in sequence, and then vacuum-dry to obtain the modified nano-kao...

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Abstract

The invention relates to a pre-crosslinking gel retarding-swelling microsphere profile control agent and a preparation method and application thereof. The pre-crosslinking gel retarding-swelling microsphere profile control agent comprises a polyacrylic acid grafting prepolymer, an acrylamide monomer, a hydrophobic monomer, an anti-salt monomer, a temperature-resistant tackifying monomer, pure alkaline, a composite surfactant, modified kaolin powder, a composite crosslinking agent, an initiator and deionized water. The pre-crosslinking gel retarding-swelling microsphere profile control agent has the advantages that by selecting particular components, particularly modifying multiple components, and utilizing the comprehensive synergistic and promoting functions of multiple technical features, the profile control agent with excellent result is obtained; the excellent high temperature-resistant property, high salt-resistant property, good tackifying property, plugging property and the like are realized; the good application prospect and industrial potential are realized in the field of petroleum exploitation.

Description

technical field [0001] The present invention relates to a microsphere used to increase oil production in oilfield exploitation and development, more particularly to a pre-crosslinked gel slow-swelling microsphere profile control agent and its preparation method and application, belonging to the "tertiary oil recovery" of oilfields The technical field of profile control, water plugging and oil flooding. Background technique [0002] With the continuous drilling and development of oilfields deeper into the strata, the conditions of reservoir strata are becoming more and more complex, the salinity of reservoir strata is getting higher and higher, and the formation temperature is getting higher and higher, and the heterogeneity situation is further deteriorating, seriously Affected the recovery rate of the oil field. [0003] At present, in order to increase the recovery rate of crude oil, the synergistic effect of cross-linked polymer and water-absorbing resin is mainly used t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F285/00C08F220/56C08F220/28C08F220/18C08F228/02C08F220/54C08F222/38C08F2/26C08F2/44C09K8/512C09K8/516
CPCC08F2/26C08F2/44C08F220/56C08F285/00C09K8/512C09K8/516
Inventor 王立文熊英周自阳林云许红恩
Owner DONGYING FANGLI CHEM CO LTD
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