High temperature resistant crosslinked acid system for acid fracturing and preparation method thereof

A technology of high temperature resistance and cross-linking acid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of large acid liquid filtration, fast reaction speed of acid rock, affecting the effect of acid fracturing, etc., and achieves dissolution speed Fast, achieve acid fracturing transformation, good compatibility effect

Pending Publication Date: 2019-12-31
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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  • High temperature resistant crosslinked acid system for acid fracturing and preparation method thereof
  • High temperature resistant crosslinked acid system for acid fracturing and preparation method thereof
  • High temperature resistant crosslinked acid system for acid fracturing and preparation method thereof

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preparation example Construction

[0028] The preparation method of above-mentioned high temperature resistant crosslinking acid thickener is as follows:

[0029] ① Add acrylamide monomer (AM): 2-acrylamide-2-methylpropanesulfonic acid (AMPS) according to the mass ratio of 2:1~2, add it to the modulation reactor and mix it, and use NaOH to adjust the pH value to 11-12 ;

[0030] ②Pump the mixed reactants in the modulation reactor into the polymerization reactor, add the catalyst azobisisobutyronitrile, and use nitrogen to keep the temperature between 0-8°C;

[0031] 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 6-15 million;

[0032] ④ Pressurize with nitrogen, extrude the reaction product, use a crusher for primary crushing, and the particle size is a...

Embodiment 1

[0040] Acid compression high temperature resistant cross-linked acid system, the mass percentage of raw materials is as follows:

[0041] High temperature resistant crosslinking acid thickener 0.7%

[0042] Cross-linking agent 1.0%

[0043] High temperature corrosion inhibitor 2.0%

[0044] Iron ion stabilizer 1.0%

[0045] Drainage aid 1.0%

[0046] The balance is hydrochloric acid with a mass fraction of 20%.

[0047] Among them, the mass ratio of monomer acrylamide (AM) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in the high temperature resistant crosslinking acid thickener is 3:1.5, and the molecular weight of the thickener is 11 million.

[0048] The crosslinking agent is zirconate.

[0049] The high temperature corrosion inhibitor is a mixture of Mannich base, methanol and water with a mass ratio of 45:40:15.

[0050] Described iron ion stabilizer is sodium citrate.

[0051] The demulsifier is polyoxyethylene polyoxypropylene polyether.

[0052] The drai...

Embodiment 2

[0056] Acid compression high temperature resistant cross-linked acid system, the mass percentage of raw materials is as follows:

[0057] High temperature resistant crosslinking acid thickener 0.8%

[0058] Cross-linking agent 2.0%

[0059] High temperature corrosion inhibitor 3.0%

[0060] Iron ion stabilizer 1.0%

[0061] Drainage aid 1.0%

[0062] The balance is hydrochloric acid with a mass fraction of 20%.

[0063] Among them, the mass ratio of monomer acrylamide (AM) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in the high temperature resistant crosslinking acid thickener is 2:1.5, and the molecular weight of the thickener is 12 million.

[0064] The crosslinking agent is zirconate.

[0065] The high temperature corrosion inhibitor is a mixture of Mannich base, methanol and water with a mass ratio of 45:40:15.

[0066] The corrosion inhibition synergist is antimony oxide.

[0067] Described iron ion stabilizer is sodium citrate.

[0068] The demulsifier i...

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Abstract

The invention belongs to the field of oil field production, and specifically relates to a high temperature resistant crosslinked acid system for acid fracturing and a preparation method thereof. An improved high temperature resistant crosslinked acid thickener is adopted, the temperature resistance and stability of an acid solution are improved, a corresponding additive with good compatibility andthe crosslinked system with controllable delay, temperature resistance and shear resistance are adopted, and good rheological performance and corrosion inhibition performance at the temperature of 160 DEG C are realized. Compared with the prior art, the high temperature resistant crosslinked acid thickener adopted in the invention has the advantages of high dissolving speed, complete dissolutionin hydrochloric acid with the mass fraction of 15-31% for 20 min and stable performance in the acid solution within 10 days; through the added concentrations of a high-temperature corrosion inhibitorand a corrosion inhibition synergist, the corrosion inhibition performance at different temperatures is adjusted; and by adjusting the concentration of the crosslinked agent, different delay, temperature resistance and shear resistance performances can be realized, so that deep acid fracturing transformation of an oil-gas reservoir is realized.

Description

technical field [0001] The invention belongs to the field of oil field stimulation, and in particular relates to a high-temperature-resistant cross-linked 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 resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC09K8/74C09K2208/32
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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