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A kind of fracturing acidification nanoemulsion drainage aid and preparation method thereof

A technology of nanoemulsion, fracturing and acidification, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve problems such as insurmountable water lock damage

Active Publication Date: 2017-05-10
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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  • A kind of fracturing acidification nanoemulsion drainage aid and preparation method thereof
  • A kind of fracturing acidification nanoemulsion drainage aid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0030] D-limonene oil 45%, nonionic surfactant isomerized tridecanol 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, non-ionic surfactant isomerized tridecanol polyoxypropylene (4) polyoxyethylene (6) ether, isopropanol, oleic acid amine, and oleic acid, and then add water to balance to 100%, Mix well to obtain a concentrated solution.

Embodiment 2

[0034] This embodiment provides a fracturing acidified 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 amount of the concentrated solution The size of the nanoemulsion is 0.2wt%. The size of the nanoemulsion is measured 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, 20-40 mesh quartz sand was filled into a 25cm long and 2.5cm diameter sand-filled tube, and it was shaken up and down 200 times to keep the permeability basically the same every time. The nanoemulsion to be tested is injected into the sand-filled tube, the lower valve is opened, and the liquid flows out under the action of gravity, and the amount of outflow liquid is recorded. The flowback efficiency is calculated to be 76%.

[0038] In comparison, the flowback efficiency of water without nanoemulsion is 57%, and the flowback efficiency of water 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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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 nanoemulsion drainage aid and a preparation method and application thereof, and belongs to the technical field of petrochemical industry. Background technique [0002] With the continuous deepening of oil and gas reservoir exploitation, the transformation of ultra-low permeability reservoirs has increasingly become the main development area. Therefore, fracturing technology has become an important production increase measure for oil and gas field development. As a fracturing fluid flowback aid for fracturing reformation, it plays an important role in increasing production. Because for ultra-low permeability, formation capillary water blocking is very serious. Data shows that 60-90% of injected liquid stays in the formation during shale gas fracturing. Most of the water is trapped around the fractured fractures and in the fractured fractures. These closed retention liquids will seriously reduce the relati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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