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Nano composite fiber clean fracturing fluid and preparation method thereof

A nano-composite fiber, clean fracturing fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low viscosity of active water fracturing fluid, too fast proppant settling, weak sand-carrying ability, etc. , to reduce the filtration rate, improve the sand-carrying performance, and prevent backflow.

Inactive Publication Date: 2014-02-05
CHINA UNITED COALBED METHANE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Among them, the active water fracturing fluid has a low viscosity and can create fractures in low-permeability coal seams, but at the same time, due to its low viscosity, it will increase the filtration loss, cause the proppant to settle too quickly, and have weak sand-carrying capacity

Method used

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  • Nano composite fiber clean fracturing fluid and preparation method thereof
  • Nano composite fiber clean fracturing fluid and preparation method thereof
  • Nano composite fiber clean fracturing fluid and preparation method thereof

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preparation example Construction

[0055] The invention also discloses a preparation method of nanocomposite fiber cleaning fracturing fluid, comprising the following steps:

[0056] Mix 0.01wt%~0.2wt% nanofiber composite, 0.8wt%~1.5wt% fiber dispersant, 3wt%~5wt% anti-swelling agent, 0.3wt%~0.6wt% conditioner and 0.1wt% ~0.3wt% anti-scaling agent is added into water, stirred and dissolved to obtain nanocomposite fiber cleaning fracturing fluid;

[0057] The nanofiber composite is a polymer / inorganic ion nanometer composite fiber, a polymer / carbon nanotube composite fiber or a polymer / layered filler composite fiber.

[0058] In the present invention, it is sufficient to uniformly disperse and dissolve the nanofiber composite, fiber dispersant, anti-swelling agent, conditioner, and anti-scaling agent in water, and the stirring and dissolving time is preferably 10-15 minutes.

[0059] The sedimentation rate, frictional resistance and fluid loss of the obtained nanocomposite fiber cleaning fracturing fluid were t...

Embodiment 1

[0062] Add 10% montmorillonite aqueous solution into the reaction kettle, stir and heat up to 80°C, add an appropriate amount of hexadecyltrimethylammonium chloride aqueous solution dropwise, stir vigorously for 12 hours, then add 2% silane coupling agent for 2 hours , the product is placed in an oven at a certain temperature and dried to a constant weight, and pulverized by a pulverizer through a 200-mesh molecular sieve to obtain organic montmorillonite.

[0063] Organic montmorillonite and PP were extruded at a twin-screw at 200°C at a ratio of 1:9 to obtain a montmorillonite / polypropylene composite material, and then polypropylene was added twice to blend to obtain a sample particle with a montmorillonite content of 5%. material.

[0064] Put the nano-composite pellets into the screw of the spinning machine, adjust the temperature of each zone, turn on the spinning metering pump, and when the spinning fluid is discharged in a stable streamline without air bubbles, install ...

Embodiment 2

[0067] In 1000ml of clear water, add 2g of disodium EDTA, 5g of solid flaky KOH, 10g of anionic surfactant aqueous solution, 5g of the nanocomposite fiber prepared in Example 1, and 40g of solid granular KCl, and stir to fully dissolve it to form a coal seam Gas well cleans fracturing fluid with nanocomposite fibers. In the formed nanocomposite fiber cleaning fracturing fluid, EDTA disodium accounts for 0.2% of the clear water mass, KOH accounts for 0.5% of the clear water mass, anionic surfactant accounts for 1% of the clear water mass, and nanocomposite fibers account for 0.1% of the clear water mass. KCl accounts for 4% of the water quality.

[0068] During fracturing reconstruction, nanocomposite fibers are used to clean the fracturing fluid in the sand-carrying fluid stage, and nanocomposite fibers may not be added in the prefluid and displacement fluid stages.

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Abstract

The invention provides a nano composite fiber clean fracturing fluid which comprises the following components in percentage by weight: 0.01wt%-0.2 wt% of nano fiber complex, 0.8wt%-1.5wt% of fiber dispersant, 3wt%-5wt% of anti-swelling agent, 0.3wt%-0.6wt% of conditioner, 0.1wt%-0.3wt% of anti-scale agent and the balance of water, wherein the nano fiber complex is polymer / inorganic ion nano composite fiber, polymer / carbon nano tube composite fiber or polymer / layered filler composite fiber. Since the nano composite fiber is uniformly dispersed in the fracturing fluid, a fiber network can be formed, the sand carrying property of the fracturing fluid is improved, the settling mode is changed, and the settling rate of a propping agent is reduced. Moreover, the nano composite fiber also can effectively prevent backflow of the propping agent and effectively reduce the filter loss rate, and the damage rate on a coal seam is only 3-10%.

Description

technical field [0001] The invention relates to the technical field of coal bed gas well fracturing stimulation, in particular to nanocomposite fiber cleaning fracturing fluid and a preparation method thereof. Background technique [0002] Coalbed methane is a kind of unconventional natural gas with methane as the main component, which is generated from coal seams and stored in coal seams in the state of adsorption. Its calorific value is equivalent to that of conventional natural gas, 2 to 5 times that of general-purpose gas, and it rarely produces pollutants after combustion, which belongs to high-quality clean gas energy. [0003] Coalbed methane reservoirs are characterized by low porosity, low permeability, and low natural production capacity. Usually, fracturing is required to obtain appropriate industrial production and realize economical exploitation. Hydraulic fracturing of coal seams is one of the most common and important means of completion-stimulation measures....

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/68C09K8/602C09K2208/08C09K2208/12
Inventor 孟尚志郭本广赵军张劲莫日和张文忠肖丽佳张飞侯腾飞
Owner CHINA UNITED COALBED METHANE
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