Oil and water selective self-expansion rubber plugging agent for fractured-vuggy reservoir as well as preparation method and application of rubber plugging agent

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: 2018-07-20
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 and water selective self-expansion rubber plugging agent for fractured-vuggy reservoir as well as preparation method and application of rubber plugging agent
  • Oil and water selective self-expansion rubber plugging agent for fractured-vuggy reservoir as well as preparation method and application of rubber plugging agent
  • Oil and water selective self-expansion rubber plugging agent for fractured-vuggy reservoir as well as preparation method and application of rubber plugging agent

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preparation example Construction

[0035] The embodiment of the present invention also provides a preparation method of the reservoir oil-water selective self-expanding rubber plugging agent as described in any of the above embodiments, including the following steps:

[0036] 1) 100 parts by weight of nitrile rubber is refined and masticated. After 15-30 parts of reinforcing agent is slowly added, 50-110 parts of water-absorbent resin is added, and then mixed 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 and 5-15 parts of oil swelling resin, and mix for 20-40 minutes;

[0039] 4) Add 0.5-3.5 parts of vulcanizing agent again, mix for 3-5 minutes, then uniformly slabs to obtain the mixed rubber, and cool;

[0040] 5) Extruding the cooled mixed rubber into thin rubber strips, and vulcanizing the rubber strips at 170°C to obtain vulcanized rubber strips;

[0041] 6) The obtained vul...

Embodiment 1

[0046] Put 100 parts of nitrile rubber into the open mill to masticate the raw rubber, weigh the parts in the formula system according to Table 1, and then add the weighed reinforcing agents, softeners, accelerators, zinc oxide, and oil one by one. The swelling resin and the vulcanizing agent are sequentially added to the open mill for mixing and mixing uniformly, and the mixed rubber is processed, and left in the cold for 24 hours. Put the mixed rubber into a mold, and vulcanize the rubber with a plate vulcanizer under the conditions of 10Mpa and 170°C to obtain a vulcanized rubber. The prepared vulcanized rubber is mechanically crushed with a crusher, and then sieved and classified by a vibrating screen to obtain rubber particles with different particle diameters.

Embodiment 2

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

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Abstract

The invention provides an oil and water selective self-expansion rubber plugging agent for a fractured-vuggy reservoir as well as a preparation method and an application of the rubber plugging agent and belongs to the field of functional polymer materials. The rubber plugging agent has the performance characteristics such as high mechanical strength, high mineralization resistance, high toughness,high volume expansion rate, no separation, autohesion and the like. The rubber plugging agent is prepared from raw materials in parts by weight as follows: 100 parts of nitrile butadiene rubber, 50-110 parts of water-absorbent resin, 5-15 parts of 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 vulcanizing agent. The rubber plugging agent can be applied to deep plugging of high-temperature, high-salt and highly-mineralized fractured-vuggy carbonate reservoirs.

Description

Technical field [0001] The invention belongs to the field of functional polymer materials, and in particular relates to a fracture-cavity type reservoir oil-water selective self-expanding rubber plugging agent, its preparation method and its application. 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 karst caves, fractures and pores. Due to the synergistic effects of crustal tectonic movement, karst superimposed structure and multi-stage accumulation, the reservoirs have formed a discontinuous spatial distribution, and the reservoir is heterogeneous. It is extremely strong, the matrix does not have the ability of storage and permeability, the oil-water system is extremely complicated, and the development of carbonate reservoirs has high technical difficulty. [0003] Most of the carbonate fracture-cavity reservoirs in Tahe Oilfiel...

Claims

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Application Information

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Patent Type & Authority Applications(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
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