Adsorption slow-release acid system for acid fracturing and preparation method thereof

A slow-release acid and acid fracturing technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of affecting the effect of acid fracturing, fast reaction speed of acid rock, large acid fluid loss, etc., and achieve good compatibility The effects of high solubility, fast dissolution, and good temperature and shear resistance

Active Publication Date: 2020-01-03
北京弘毅恩泽能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The acid liquid systems such as thickened acid and cross-linked acid involved in the above patents have undergone a lot of improvement work in terms of temperature resistance and shear resistance and reducing the reaction speed of acid rocks, so that the acid liquid system can maximize the temperature resistance and shear resistance. However, due to the high formation temperature in deep carbonate rock reservoirs, the viscosity of the acid solution system is low at high temperature, the acid fluid loss is large, and the acid rock reaction speed is fast, so it is difficult for the acid solution to enter the deep part of the reservoir, thus Seriously affected the effect of acid compression

Method used

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  • Adsorption slow-release acid system for acid fracturing and preparation method thereof
  • Adsorption slow-release acid system for acid fracturing and preparation method thereof
  • Adsorption slow-release acid system for acid fracturing and preparation method thereof

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preparation example Construction

[0046] The preparation method of the above-mentioned adsorption slow-release acid thickener for acid fracturing, the steps are as follows:

[0047] ① Add acrylamide monomer AM: 2-acrylamide-2-methylpropanesulfonic acid AMPS, according to the mass ratio of 5:1~2, add to the modulation reactor and mix, and use NaOH to adjust the pH value to 11-12;

[0048] ②Pump the mixed reactants in the modulation reactor into the polymerization reactor, add the catalyst azobisisobutyronitrile, and use nitrogen to keep the temperature between 0-5°C;

[0049] ③ Under the condition of stirring, slowly add dimethyl diallyl ammonium chloride, pay attention to observe the temperature change, control the reaction temperature within 10 ℃, and continue the reaction for 4 hours, and the slow-release acid thickener is AM-AMPS copolymerization substance, molecular weight 8-12 million;

[0050] ④ Pressurize with nitrogen, extrude the reaction product, and use a crushing machine for primary crushing, with...

Embodiment 1

[0058] The adsorption slow-release acid system used for acid fracturing, the mass percentage of raw materials is as follows:

[0059] Slow-release acid thickener: 0.5%;

[0060] Adsorbent: 10%;

[0061] Synergist: 1.5%;

[0062] Corrosion inhibitor: 2.0%;

[0063] Iron ion stabilizer: 1.0%;

[0064] The remainder is hydrochloric acid with a mass concentration of 15%.

[0065] Among them, the slow-release acid thickener components are as follows: the mass ratio of monomer acrylamide (AM): 2-acrylamido-2-methylpropanesulfonic acid (AMPS) is 5:1.5, the molecular weight of the slow-release acid thickener 12 million.

[0066] The viscosity of the acid liquid base liquid is 24mPa.s, the particle size of the adsorbent is 0.45mm-0.90mm, and the dynamic corrosion rate at 120°C is 4.8g / m 2 .h.

Embodiment 2

[0068] The adsorption slow-release acid system used for acid fracturing, the mass percentage of raw materials is as follows:

[0069] Slow-release acid thickener: 0.7%;

[0070] Adsorbent: 10%;

[0071] Synergist: 1.5%;

[0072] Corrosion inhibitor: 2.0%;

[0073] Iron ion stabilizer: 1.0%;

[0074] The balance is hydrochloric acid with a mass fraction of 20%.

[0075] Among them, the mass ratio of monomer acrylamide (AM) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in the slow-release acid thickener is 5:1.5, and the molecular weight of the thickener is 12 million.

[0076] The viscosity of the acid liquid base liquid is 36mPa.s, the particle size of the adsorbent is 0.45mm-0.90mm, and the dynamic corrosion rate at 120°C is 11.2g / m 2 .h, 120°C, 170S-1 shear for 90min, viscosity greater than 40mPa.s.( figure 1 )

[0077] When the system is used on site, according to the configuration method of the above system, the performance of the configured base liquid syste...

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Abstract

The invention belongs to the field of oil field production enhancement, and particularly relates to an adsorption slow-release acid system for acid fracturing. The adsorption slow-release acid systemfor acid fracturing comprises the following raw material composition in percent by mass: 0.3%-1.0% of a slow-release acid thickener, 5.0%-60.0% of an adsorbent, 0.5%-1.5% of a synergist, 1.0%-5.0% ofa corrosion inhibitor, 0.5%-1.0% of an iron ion stabilizer, and the balance hydrochloric acid of 15-28%. A multi-component copolymerized polymer is used as the thickener of a slow-release acid, and the thickener and the synergist can produce viscoelastic effects, so that the slow-release acid has relatively good rheological properties at a high temperature. According to reservoir geological characteristics, construction displacement and the like, a sand addition ratio of the adsorbent is adjusted, and adjustment of a total amount of the slow-release acid is realized while sand blockage is effectively prevented. The system not only makes full use of performance advantages of an existing acid solution system, but also originally uses the solid adsorbent to transport a high-concentration acidsolution to the front of an acid-fracturing fracture, and at the same time, the adsorbent can also play multiple functions such as temporary blocking and direction changing.

Description

technical field [0001] The invention belongs to the field of increasing production in oil fields, and in particular relates to an adsorption slow-release acid system for acid fracturing and a preparation method thereof. Background technique [0002] The storage spaces of carbonate reservoirs are pores, vugs and fractures, but due to the low matrix permeability of this type of reservoir, when the natural production of carbonate reservoirs cannot realize industrial and economical exploitation, acid fracturing is to increase the permeability of this type of reservoir. Key technologies for reservoir productivity. Generally, acid fracturing working fluids include white acid, thickened acid, temperature-controlled acid, cross-linking acid, and cleaning acid. Improve the conductivity of acid-etched fractures. Generally, these acid systems achieve the above technical goals by reducing the reaction rate between acid and rock, mainly by improving the viscosity and temperature resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/76C09K8/74C08F220/56C08F220/58
CPCC09K8/665C09K8/68C09K8/882C08F220/56C09K2208/32
Inventor 唐汝众段秀全程鹏周德川
Owner 北京弘毅恩泽能源技术有限公司
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