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-permeability layer to improve the physical properties of the high-permeability layer, but the low-permeability layer has not been effectively improved. also increased significantly

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

Embodiment 1

[0032] In this example, the following steps are used to prepare water-swellable rubber flexible temporary plugging particles:

[0033] (1) Dissolve 10 g of acrylamide, 4 g of bentonite and 1.8 g of diacetone acrylamide in 50 g of deionized water successively using ultrasound;

[0034] (2) Add the aqueous solution prepared in step (1) to 16.63 g of concentrated natural rubber latex, stir evenly, seal it, and place it in a constant temperature water bath at 45°C for aging for 2 hours;

[0035] (3) Add 0.035g potassium persulfate, 0.035g sodium bisulfite, 0.06g N’N-methylenebisacrylamide, stir well, seal and react at 45°C for 4.5h to form a gel;

[0036] (4) Use scissors to cut into pieces of about 1cm×1cm×1cm, place them in an oven at 90°C for drying, and crush the dried pieces with a pulverizer.

Embodiment 2

[0038] In this example, the following steps are used to prepare water-swellable rubber flexible temporary plugging particles:

[0039] (1) Dissolve 10g of acrylamide, 4g of bentonite and 1.8g of sodium p-styrenesulfonate hydrate in 50g of deionized water successively using ultrasound;

[0040] (2) Add the aqueous solution prepared in step (1) to 16.63 g of concentrated natural rubber latex, stir evenly, seal it, and place it in a constant temperature water bath at 45°C for aging for 2 hours;

[0041] (3) Add 0.035g potassium persulfate, 0.035g sodium bisulfite, 0.06g N’N-methylenebisacrylamide, stir well, seal and react at 45°C for 4.5h to form a gel;

[0042] (4) Use scissors to cut into pieces of about 1cm×1cm×1cm, place them in an oven at 90°C for drying, and crush the dried pieces with a pulverizer.

Embodiment 3

[0044] In this example, the following steps are used to prepare water-swellable rubber flexible temporary plugging particles:

[0045] (1) Dissolve 10 g of acrylamide, 4 g of bentonite and 1.8 g of diacetone acrylamide in 50 g of deionized water successively using ultrasound;

[0046](2) Add it to 16.63g of concentrated natural rubber latex, stir evenly, seal it, and place it in a constant temperature water bath at 45°C for aging for 2 hours;

[0047] (3) Add 0.035g of ammonium persulfate, 0.035g of sodium thiosulfate, and 0.06g of N’N-methylenebisacrylamide, stir well, seal and react at 45°C for 4.5h to form a gel;

[0048] (4) Use scissors to cut into pieces of about 1cm×1cm×1cm, place them in an oven at 90°C for drying, and crush the dried pieces with a pulverizer.

[0049] The following methods are used to further illustrate the effect of the water-swellable rubber flexible temporary plugging particles prepared in the above examples.

[0050] The prepared salinity is 10×...

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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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