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Associated type fracturing fluid resistant to high temperature and preparation method of associated type fracturing fluid

A fracturing fluid and associative technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of large damage to reservoir permeability, increased load of fracturing equipment, and poor shear resistance of jelly and other problems, to achieve the effect of improving sand-carrying performance, reducing damage, and low water-insoluble content

Inactive Publication Date: 2018-04-03
SOUTHWEST PETROLEUM UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the viscosity of the commonly used guar gum fracturing fluid decreases rapidly under high temperature conditions, and the gel formed by cross-linking technology has poor shear resistance; in addition, the gel viscosity is high, and the friction resistance during construction and pumping is high. Increasing the load of fracturing equipment is not conducive to deep well construction; at the same time, the thickener guanidine glue has high water-insoluble content, incomplete gel breaking, high residue content after gel breaking, and great damage to reservoir permeability (especially deep well tight oil and gas reservoirs )

Method used

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  • Associated type fracturing fluid resistant to high temperature and preparation method of associated type fracturing fluid
  • Associated type fracturing fluid resistant to high temperature and preparation method of associated type fracturing fluid
  • Associated type fracturing fluid resistant to high temperature and preparation method of associated type fracturing fluid

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preparation example Construction

[0065] The present invention also provides a method for preparing the above-mentioned high-temperature resistant associative fracturing fluid, comprising: S) adding 0.4 to 0.65 wt% of an associative polymer and 0.05 to 0.4 wt% of a composite synergist for fracturing fluid , 0.2-2wt% clay stabilizer, 0.3-0.5wt% high-temperature stabilizer, 0.01-0.15wt% gel breaker and the rest of the water are mixed to obtain a high-temperature resistant associative fracturing fluid;

[0066] Among them, the present invention has no special limitation on the sources of all raw materials, which can be commercially available. The associative polymer, composite synergist for fracturing fluid, clay stabilizer, high temperature stabilizer, gel breaker and water are all the same as above, and will not be repeated here.

[0067] According to the present invention, the step S) is specifically: mixing and stirring 0.4-0.65 wt% of the association polymer and the remaining water, and then adding 0.05-0.4 ...

Embodiment 1

[0074] Based on the fact that the hydrophobic monomer is sodium acrylamide alkyl sulfonate (the number of alkyl carbon atoms is 18, the mass ratio relative to acrylamide is 8%), and the temperature-resistant and salt-resistant monomer is AMPS (the mass ratio relative to acrylamide monomer is 8%) 5%) associative polymer thickener (the mass of hydrolysis unit is 25% of the mass of acrylamide monomer), compound synergist for fracturing fluid (10% polyether surfactant (G23, Sichuan Guangya Polymer Chemical Co., Ltd.), 20% ethanol, 70% water), clay stabilizer (quaternary ammonium salt clay stabilizer GAF-16, Sichuan Guangya Polymer Chemical Co., Ltd.), sodium thiosulfate high temperature stabilizer, using Qingshui has prepared high temperature resistant associative fracturing fluid.

[0075] According to Table 1, the method of preparing high-temperature-resistant associative fracturing fluid is as follows: use a measuring cylinder to measure 500ml of tap water, pour it into the agi...

Embodiment 2

[0080] Based on the fact that the hydrophobic monomer is sodium acrylamide alkyl sulfonate (the number of alkyl carbon atoms is 20, the mass ratio of acrylamide is 10%), and the temperature-resistant and salt-resistant monomer is AMPS (the mass ratio of acrylamide monomer is 10%) 10%) associative polymer thickener (the quality of the hydrolysis unit is 25% of the acrylamide monomer quality), synergist (20% polyoxyethylene ether surfactant (A-3, Sichuan Guangya Polymer Chemical Co., Ltd.), 10% ethanol, 70% water), clay stabilizer (quaternary ammonium salt clay stabilizer GAF-16, Sichuan Guangya Polymer Chemical Co., Ltd.), sodium thiosulfate high temperature stabilizer, using Qingshui has prepared high temperature resistant associative fracturing fluid.

[0081] According to Table 2, the method for preparing high-temperature-resistant associative fracturing fluid is as follows: measure 500ml of tap water with a measuring cylinder, pour it into the agitator, and adjust the speed...

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Abstract

The invention provides associated type fracturing fluid resistant to high temperature. The associated type fracturing fluid resistant to high temperature is prepared from 0.4wt%-0.65wt% of associatedpolymers, 0.05wt%-0.4wt% of a compound synergist for the fracturing fluid, 0.2wt%-2wt% of a clay stabilizer, 0.3wt%-0.5wt% of a high-temperature stabilizer, 0.01wt%-0.15wt% of a gel breaker and the balance of water. Compared with the prior art, under the joint action of the associated polymers, the compound synergist for the fracturing fluid, the clay stabilizer, the high-temperature stabilizer and the gel breaker, the fracturing fluid has the advantages that temperature resistance and anti-shear ability are enhanced, temperature resistant capacity reaches 180 DEG C, besides, residue content of the gel breaker of the fracturing fluid is low, the damage rate of core substrate permeability is low, and the fracturing fluid has the characteristics of low residue content and little damage.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a composite synergist for fracturing fluid, a high-temperature-resistant associative fracturing fluid and a preparation method thereof. Background technique [0002] There are abundant unconventional oil and gas resources at home and abroad, among which low-permeability and ultra-low-permeability reservoirs account for a huge proportion. However, due to the low permeability and small porosity of low-permeability reservoirs, there is basically no initial productivity after drilling and completion. Carry out production increase transformation. At present, the improvement measures for unconventional tight reservoirs mainly adopt hydraulic fracturing technology: inject liquid into the formation with high displacement, form high pressure in the formation, press open the formation, and form fractures; at the same time, use liquid with a certain viscosity to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/88
CPCC09K8/602C09K8/607C09K8/68C09K8/882C09K2208/24C09K2208/28
Inventor 罗平亚郭拥军王翔林代洪刘宽
Owner SOUTHWEST PETROLEUM UNIV
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