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Disulfonic acid group surfactant, clean fracturing fluid and preparation method of clean fracturing fluid

A surfactant and cleaning fracturing fluid technology, applied in chemical instruments and methods, organic chemistry, drilling compositions, etc., can solve problems such as poor salt resistance, high cost, and complicated preparation process

Active Publication Date: 2021-05-18
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned defects or deficiencies, the purpose of the present invention is to provide a disulfonic acid-based surfactant, clean fracturing fluid and its preparation method, which can effectively solve the problems of poor salt tolerance and high cost in the existing clean fracturing fluid system. , The problem of complex preparation process

Method used

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  • Disulfonic acid group surfactant, clean fracturing fluid and preparation method of clean fracturing fluid
  • Disulfonic acid group surfactant, clean fracturing fluid and preparation method of clean fracturing fluid
  • Disulfonic acid group surfactant, clean fracturing fluid and preparation method of clean fracturing fluid

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Embodiment 1

[0033] A kind of disulfonic acid-based surfactant, cleaning fracturing fluid and preparation method thereof provided in this embodiment 1 specifically include the following processes:

[0034] The preparation of disulfonic acid-based surfactant comprises the following steps:

[0035] Step (1): Dissolve oleic amidopropyl dimethyl tertiary amine (14.669g, 40mmol) and epichlorohydrin (3.7g, 40mmol) in absolute ethanol, and add hydrochloric acid (1.45g, 40mmol) , the system was always under the protection of nitrogen, and reacted at 50°C for 16 hours. After the reaction, the solvent ethanol was removed at 45°C with a rotary evaporator to obtain intermediate A, which was a light yellow liquid;

[0036] Step (2): Intermediate A (51.52g, 100mmol) and piperazine-N,N'-di(2-ethanesulfonic acid) sesquisodium salt (134.14 g, 200mmol), add 100ml ethanol, reflux reaction 18 hours under the condition of 70 DEG C; ), which is in the form of a yellow paste.

[0037] Preparation of clean fra...

Embodiment 2

[0039] A kind of disulfonic acid-based surfactant, cleaning fracturing fluid and preparation method thereof provided in this embodiment 2 specifically include the following processes:

[0040] Step (1): erucamidopropyl dimethyl tertiary amine (16.908g, 40mmol) and epichlorohydrin (3.7g, 40mmol) were dissolved in absolute ethanol, and hydrochloric acid (1.45g, 40mmol) was added, The system was always under nitrogen protection, and reacted at 50°C for 16 hours. After the reaction, the solvent ethanol was removed at 45°C with a rotary evaporator to obtain Intermediate A, which was a light yellow liquid;

[0041] Step (2): Intermediate A (51.52g, 100mmol) and piperazine-N,N'-di(2-ethanesulfonic acid) sesquisodium salt (134.14 g, 200mmol), add 100ml ethanol, reflux reaction 18 hours under the condition of 70 DEG C; ), its NMR characterization hydrogen spectrum such as Figure 5 As shown, its properties are yellow paste.

[0042] Preparation of clean fracturing fluid: at room tem...

Embodiment 3

[0044] A kind of disulfonic acid-based surfactant, clean fracturing fluid and preparation method thereof provided in this embodiment 3 specifically include the following processes:

[0045] The preparation of disulfonic acid-based surfactant comprises the following steps:

[0046] Step (1): Dissolve oleic amidopropyl dimethyl tertiary amine (14.669g, 40mmol) and epichlorohydrin (3.7g, 40mmol) in absolute ethanol, and add hydrochloric acid (1.45g, 40mmol) , the system was always under the protection of nitrogen, and reacted at 50°C for 16 hours. After the reaction, the solvent ethanol was removed at 45°C with a rotary evaporator to obtain intermediate A, which was a light yellow liquid;

[0047]Step (2): Intermediate A (51.52g, 100mmol) and piperazine-N,N'-di(2-ethanesulfonic acid) sesquisodium salt (134.14 g, 200mmol), add 100ml ethanol, reflux reaction 12 hours under the condition of 80 ℃; After the reaction finishes, remove solvent ethanol at 45 ℃ with rotary evaporator, ma...

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Abstract

The invention discloses a disulfonic surfactant, a clean fracturing fluid and a preparation method of the disulfonic surfactant. The preparation method comprises: with a low-cost and easily-available long-chain tertiary amine compound and epoxy chloropropane as raw materials, an intermediate A is produced, then the intermediate A and piperazine-N,N'-bis(2-ethanesulfonic acid) sesquicarbonate are further subjected to a quaternization reaction, and the double-tailed disulfonic acid group surfactant is prepared. The disulfonic acid group surfactant has good surface activity reducing capability and is simple to prepare; the clean fracturing fluid using the thickening agent has excellent salt resistance and temperature resistance, and the shear viscosity of the optimal product at 120 DEG C and 170 / s is not less than 60 mPa.s, which is far greater than 25 mPa.s required by field construction of the clean fracturing fluid. The product has a good application prospect in oil field fracturing fluid and recovery efficiency improvement.

Description

technical field [0001] The invention relates to the technical field of surfactants, in particular to a disulfonic acid-based surfactant, cleaning fracturing fluid and a preparation method thereof. Background technique [0002] Clean fracturing fluid, also known as viscoelastic surfactant (VES) or polymer-free fracturing fluid, is a type of water-based fracturing fluid. In 1997, Schlumberger launched the first product (J508w), which has been promoted rapidly since it was put into the market. At present, multi-well fracturing operations have been successfully implemented, and good economic benefits have been achieved. However, the existing clean fracturing fluids have the problems of poor salt tolerance, high cost, and complicated preparation processes. [0003] The molecular structure of gemini surfactants is similar to the aggregation of two surfactant molecules, so it is sometimes called dimeric surfactants or twinned surfactants. Commonly used ordinary surfactants only h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D295/13C09K8/68C09K8/86
CPCC07D295/13C09K8/68C09K8/86C09K2208/30
Inventor 毛金成徐涛毛金桦叶昊杨小江林冲戴思凯
Owner SOUTHWEST PETROLEUM UNIV
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