Water-swelling rubber flexible temporary plugging particle and preparation method thereof

A water-swellable rubber and flexible technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of oil increase and water cut in oil wells, etc., and achieve the characteristics of small loss of rubber material, easy flowback, and excellent water absorption performance Effect

Active Publication Date: 2021-08-17
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Production stimulation measures such as fracturing and acidizing are often used, and fracturing fluid and acid liquid will also preferentially enter the high-permeabilit

Method used

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  • Water-swelling rubber flexible temporary plugging particle and preparation method thereof
  • Water-swelling rubber flexible temporary plugging particle and preparation method thereof
  • Water-swelling rubber flexible temporary plugging particle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1

[0032] In this embodiment, the water absorbing expansion rubber flexible temporary blockage particles are prepared by using the following steps:

[0033] (1) 10 g of acrylamide, 4 g bentonite and 1.8 g of double acetone acrylamide were dissolved in 50 g of deionized water.

[0034] (2) The aqueous solution prepared in step (1) was added to 16.63 g and concentrated in natural lateration, stirred evenly, sealed, placed in a 40 ° C constant temperature water bath cooker 2h;

[0035] (3) 0.035 g of potassium sulfate, 0.035 g of sodium bisulfite, 0.06 g N-methylene bis acrylamide, stirred even after mixing at 45 ° C at 45 ° C;

[0036] (4) Cut the rubber block of about 1 cm × 1 cm × 1 cm with a scissors, and placed in an oven at a 90 ° C oven, pulverizing the rubber block for drying.

Example Embodiment

[0037] Example 2

[0038] In this embodiment, the water absorbing expansion rubber flexible temporary blockage particles are prepared by using the following steps:

[0039] (1) 10 g of acrylamide, 4 g of bentonite and 1.8 g of sodium sulfonate hydrate were dissolved in 50 g of deionized water.

[0040] (2) The aqueous solution prepared in step (1) was added to 16.63 g and concentrated in natural lateration, stirred evenly, sealed, placed in a 40 ° C constant temperature water bath cooker 2h;

[0041] (3) 0.035 g of potassium sulfate, 0.035 g of sodium bisulfite, 0.06 g N-methylene bis acrylamide, stirred even after mixing at 45 ° C at 45 ° C;

[0042] (4) Cut the rubber block of about 1 cm × 1 cm × 1 cm with a scissors, and placed in an oven at a 90 ° C oven, pulverizing the rubber block for drying.

Example Embodiment

[0043] Example 3

[0044] In this embodiment, the water absorbing expansion rubber flexible temporary blockage particles are prepared by using the following steps:

[0045] (1) 10 g of acrylamide, 4 g bentonite and 1.8 g of double acetone acrylamide were dissolved in 50 g of deionized water.

[0046](2) Add to 16.63 g of concentrated natural latex, stir evenly, sealed, placed in a constant temperature water bath in 45 ° C for 2 h;

[0047] (3) 0.035 g of ammonium sulfate, 0.035 g of sodium thiosulfate, 0.06 g N-methylene bis acrylamide, stirred and uniformly mixed at 45 ° C for 4.5 h;

[0048] (4) Cut the rubber block of about 1 cm × 1 cm × 1 cm with a scissors, and placed in an oven at a 90 ° C oven, pulverizing the rubber block for drying.

[0049] The effect of the water absorption expansion rubber obtained in the above-described embodiments is further explained using the following method.

[0050] Formulated mineralization is 10 × 10 4 Mg / L, 15 × 10 4 Mg / L, 20 × 10 4 Mg / ...

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Abstract

The invention provides a water-swellable rubber flexible temporary plugging particle. The water-swellable rubber flexible temporary plugging particle is prepared by the following method: dissolving acrylamide, bentonite and a functional monomer in water; adding the solution into natural latex, and curing at 45-50 DEG C for 2 hours; adding an initiator and a cross-linking agent, and carrying out a sealed reaction at 45-50 DEG C for 4-5 h to form gel; and drying the reacted product, and crushing to obtain the product. The addition amount of substances is as follows in percentage by mass: 10-15% of acrylamide; 2.5- 5% of bentonite; based on the mass of dry glue, 9.6-12.6% of natural latex; a functional monomer accounting for 10% of the mass sum of the dry glue of the natural latex and the acrylamide; a cross-linking agent accounting for 0.28-0.33% of the mass sum of the dry glue of the natural latex and theacrylamide; an initiator accounting for 0.22-0.39% of the mass sum of the dry glue of the natural latex and the acrylamide; 28-32% of total solid content, and the balance of water. The particle size of the water-swelling rubber flexible temporary plugging particle is controllable and can be adjusted according to the entering depth requirement; the residue rate after degradation is lower than 3%, and flowback is easy; and the particle has a certain temperature resistance and salt resistance.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a water-absorbing swellable rubber flexible temporary plugging particle and a method for preparing the temporary plugging particle. Background technique [0002] As the development of oil and gas fields enters the middle and later stages, due to the heterogeneity of formations, oil and gas in high-permeability reservoirs are preferentially exploited. How to improve the oil recovery of low-permeability reservoirs has always been a research hotspot. Production stimulation measures such as fracturing and acidizing are often used, and fracturing fluid and acid liquid will also preferentially enter the high-permeability layer to improve the physical properties of the high-permeability layer. also increased substantially. Therefore, the key to solving the problem is to control the diversion of fracturing fluid and acid fluid, and enter the low-permeability reser...

Claims

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Application Information

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IPC IPC(8): C08F253/00C08F220/56C08F220/58C08F222/38C08F212/14C08F2/44C08K3/34C09K8/516
CPCC08F253/00C08F2/44C08K3/346C09K8/516C08F220/56C08F220/58C08F222/385C08F212/30
Inventor 邢芳芳蒲万芬杜代军樊桓材
Owner SOUTHWEST PETROLEUM UNIV
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