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Oil-water selective self-expanding rubber plugging agent for fracture-cavity reservoirs, its preparation method and application

A self-expanding, rubber plugging technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of long-term stability of reservoirs, high cost, small size, etc., to achieve good economic benefits and practical application value , strong resistance to salinity, and high volume expansion ratio

Active Publication Date: 2020-08-28
NORTHWEST BRANCH CO TECH RES INST OF PETROLEUM ENG SINOPEC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, polymer microspheres are mostly used for water plugging and flooding, but the problem is that (1) polymer microspheres used for water plugging and flooding are generally relatively small in size (calculated in nm), and microsphere technology is not suitable for plugging large pores, such as Fracture-vuggy reservoirs like the Northwest Oilfield in my country have poor adaptability in high-permeability zones; ②Previous microspheres use gel as the nucleus in water-bearing reservoirs, which has an impact on the long-term stability of the reservoir; ③Microspheres The raw material of the ball comes from organic chemical monomers, the cost is relatively high, and the cost of the synthesis technology and application of the microsphere is relatively high
After the resin is chemically solidified, the plugging agent forms a chemical bond with the sand surface, thereby blocking the formation, affecting the oil flow of the oil passage, and affecting the recovery factor

Method used

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  • Oil-water selective self-expanding rubber plugging agent for fracture-cavity reservoirs, its preparation method and application
  • Oil-water selective self-expanding rubber plugging agent for fracture-cavity reservoirs, its preparation method and application
  • Oil-water selective self-expanding rubber plugging agent for fracture-cavity reservoirs, its preparation method and application

Examples

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preparation example Construction

[0035] The embodiments of the present invention also provide a method for preparing the oil-water selective self-expanding rubber plugging agent for oil reservoirs as described in any one of the above embodiments, comprising the following steps:

[0036] 1) Open kneading and masticating 100 parts by weight of nitrile rubber, slowly add 15-30 parts of reinforcing agent, then add 50-110 parts of water-absorbing resin, and then knead for 5-10 minutes;

[0037] 2) Add 0.5-2 parts of softener and 2-5 parts of accelerator to the above system in sequence, and mix for 10-30 minutes;

[0038] 3) Then add 3-6 parts of zinc oxide, 5-15 parts of oil-swellable resin, and mix for 20-40 minutes;

[0039] 4) Add 0.5-3.5 parts of vulcanizing agent, knead for 3-5 minutes, and evenly slice to obtain the mixed rubber, and cool it down;

[0040] 5) Extrude the cooled mixed rubber as thin rubber strips, and pressurize and vulcanize the rubber strips at 170° C. to obtain vulcanized rubber strips; ...

Embodiment 1

[0046] Put 100 parts of nitrile rubber into the open mill to carry out the mastication of raw rubber, weigh the measured parts in the formula system according to Table 1, and then add the weighed reinforcing agent, softener, accelerator, zinc oxide, oil Swelling resin and vulcanizing agent are sequentially added to the open mill for mixing and mixing evenly, and the mixed rubber is processed, and left to cool for 24 hours. Put the mixed rubber into the mold, and vulcanize the rubber with a flat vulcanizer under the conditions of 10Mpa and 170°C to obtain vulcanized rubber. The prepared vulcanized rubber is mechanically crushed by a pulverizer, and then sieved and classified by a vibrating sieve to obtain rubber particles with different particle sizes.

Embodiment 2

[0048] The preparation method is the same as that of Example 1, except that the parts by weight of the components added are different. See Table 1 for the specific mass parts of each component added.

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Abstract

A fracture cave-type reservoir oil / water selective self-expanding rubber plugging agent, a preparation method therefor, and an application thereof. The plugging agent comprises the following raw materials, in parts by weight: 100 parts of nitrile rubber, 50-110 parts of a water-absorbing resin, 5-15 parts of an oil-swelling resin, 15-30 parts of a reinforcing agent, 0.5-2 parts of a softening agent, 2-5 parts of an accelerant, 3-6 parts of zinc oxide, and 0.5-3.5 parts of a vulcanising agent. The plugging agent can be applied to high-temperature high-salt high-mineralisation fracture cave-type carbonate rock reservoir deep plugging.

Description

technical field [0001] The invention belongs to the field of functional polymer materials, and in particular relates to an oil-water selective self-expanding rubber plugging agent for fracture-cavity reservoirs, a preparation method and application thereof. Background technique [0002] Carbonate oil and gas reservoirs have huge oil and gas reserves, of which more than 30% are fracture-cavity reservoirs. This type of oil and gas reservoir is composed of dissolved caves, fractures, and dissolved pores. Due to the synergistic effects of crustal tectonic movement, karst superimposed structure, and multi-stage accumulation, the reservoir has formed a discontinuous spatial distribution and reservoir heterogeneity. Extremely strong, the matrix does not have the ability to store seepage, the oil-water system is extremely complex, and the development of carbonate reservoirs is technically difficult. [0003] Most of the fractured-vuggy carbonate reservoirs in Tahe Oilfield are high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/50
CPCC09K8/50
Inventor 李亮李再峰张潇周晓燕王建海陈康任波郭娜伍亚军马淑芬刘广燕
Owner NORTHWEST BRANCH CO TECH RES INST OF PETROLEUM ENG SINOPEC