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Discharge aiding agent of fracture acidizing nanoemulsion and preparation method of discharge aiding agent

A nano-emulsion, fracturing and acidizing technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as inability to overcome water lock damage

Active Publication Date: 2014-10-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned patents cannot overcome the problem of water lock damage in the fracturing and acidizing process of oil and gas wells

Method used

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  • Discharge aiding agent of fracture acidizing nanoemulsion and preparation method of discharge aiding agent
  • Discharge aiding agent of fracture acidizing nanoemulsion and preparation method of discharge aiding agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a concentrated solution of a fracturing and acidifying nanoemulsion drainage aid. In terms of weight percentage, its raw material composition includes:

[0030] D-limonene oil 45%, non-ionic surfactant isotridecyl alcohol polyoxypropylene (4) polyoxyethylene (6) ether 35%, isopropanol 8%, oleic acid amine 2.6%, oleic acid 1.3%, The balance is water.

[0031] The concentrate is prepared by the following steps:

[0032] Mix D-limonene oil, nonionic surfactant isomeric tridecyl alcohol polyoxypropylene (4) polyoxyethylene (6) ether, isopropanol, oleic acid amine, oleic acid, then add water to balance to 100%, Mix well to obtain a concentrate.

Embodiment 2

[0034] This embodiment provides a fracturing and acidifying nanoemulsion drainage aid, which is a uniform transparent or light blue nanoemulsion obtained by diluting the concentrated solution of Example 1 with KCl water with a concentration of 2wt%. The size of the nanoemulsion is determined by dynamic laser scattering: the diameter of the liquid particles is between 20-100 nanometers.

Embodiment 3

[0036] Flowback efficiency test:

[0037] Using the nanoemulsion of Example 2 as a drainage aid, fill 20-40 mesh quartz sand into a sand-filling tube with a length of 25 cm and a diameter of 2.5 cm, vibrate up and down 200 times to keep the permeability basically consistent each time. The nanoemulsion to be tested is injected into the sand filling pipe, the lower valve is opened to allow the liquid to flow out under the action of gravity, the amount of liquid flowing out is recorded, and the flowback efficiency is calculated to be 76%.

[0038] Compared with the flowback efficiency of water without nanoemulsion, which is 57%, and the flowback efficiency without fatty acid and fatty amine is 70%, it can be seen that adding fatty acid and fatty amine can further improve the flowback rate of nanoemulsion.

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PUM

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Abstract

The invention provides a discharge aiding agent of a fracture acidizing nanoemulsion and a preparation method of the discharge aiding agent. A concentrated solution of the nanoemulsion is prepared from the following raw materials by weight percent: 10% to 45% of oil, 10% to 45% of surfactant, 2% to 20% of cosurfactant, 1% to 7% of fatty acid, 1% to 7% of fatty amine and the balance of water. After the concentrated solution is diluted and stirred into a water phase, the nanoemulsion can be formed. The nanoemulsion can be applied to fracturing transformation of oil and gas reservoirs so as to reduce the damage of water blocking to the oil and gas reservoirs. The discharge aiding agent provided by the invention has the advantages of high flowback efficiency, simple preparation method and the like.

Description

technical field [0001] The invention relates to a fracturing acidification nano-emulsion drainage aid and a preparation method and application thereof, belonging to the technical field of petrochemical industry. Background technique [0002] With the development of oil and gas reservoirs, the stimulation of ultra-low permeability reservoirs has increasingly become the main field of development, so the fracturing technology has become an important production increase measure for oil and gas field development. As a fracturing fluid flowback aid for fracturing reconstruction, it plays an important role in increasing production. Because for ultra-low permeability, formation capillary water lock damage is very serious. According to data, 60-90% of the injected liquid stays in the formation during shale gas fracturing. Most of the water is sealed and stagnated around the fractures and in the fractures. These closed and stagnant liquids will seriously reduce the relative permeabi...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/74
CPCC09K8/602C09K8/68C09K8/74
Inventor 杨江姜伟管保山卢拥军丁云宏邱晓惠崔伟香
Owner PETROCHINA CO LTD
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