Oligomer surfactant clean fracturing fluid and preparation method thereof

A technology of surfactant and clean fracturing fluid, which is applied in the field of clean fracturing, oligomeric surfactant cleaning fracturing fluid and its preparation, and the synthesis process of oligomeric polyalkylene polyquaternary ammonium salt cationic surfactant, It can solve the problems of difficult control, high cost, and long synthesis time, and achieve the effects of short synthesis cycle, good shear resistance and temperature resistance, and simple synthesis process

Active Publication Date: 2015-06-17
陕西延长石油(集团)有限责任公司(延长油矿管理局)油气勘探公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Gemini surfactants often have the disadvantages of high cost, long synthesis time and difficulty in control

Method used

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  • Oligomer surfactant clean fracturing fluid and preparation method thereof
  • Oligomer surfactant clean fracturing fluid and preparation method thereof
  • Oligomer surfactant clean fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] An oligomeric surfactant cleaning fracturing fluid, which is composed of the following components in mass percentage:

[0025]

[0026] Among them, the molecular formula of oligomeric polyalkyl polyquaternary ammonium salt cationic surfactant is as follows:

[0027]

[0028] Where: R 1 Is a straight-chain saturated long-chain alkyl group containing 12 carbon atoms; R 2 Is methyl; X - For Cl - .

[0029] The preparation method of this embodiment includes the following steps:

[0030] Step 1. Weigh 15g of diethylamine into the reaction vessel, slowly add 17mL 6mol·L dropwise -1 Hydrochloric acid and 37g of epichlorohydrin, then add 50g of water, increase the temperature to 80°C and stir the reaction for 1.5h to obtain Intermediate A.

[0031] Step 2. Take 40g of Intermediate A and add it to the reactor, add dilute hydrochloric acid to adjust the pH to 7.0, then add 21g of dodecyldimethyl tertiary amine, then add 79g of water, and react for 2h under reflux;

[0032] Step 3. The crude...

Embodiment 2

[0041] An oligomeric surfactant cleaning fracturing fluid, which is composed of the following components in mass percentage:

[0042]

[0043] Among them, the molecular formula of oligomeric polyalkyl polyquaternary ammonium salt cationic surfactant is as follows:

[0044]

[0045] Where: R 1 Is a straight-chain saturated long-chain alkyl group containing 14 carbon atoms; R 2 Is methyl; X - For Cl - .

[0046] The preparation method of this embodiment includes the following steps:

[0047] Step 1. Weigh 15g of diethylamine into the reaction vessel and slowly add 17m 6mol·L dropwise -1 Hydrochloric acid and 37g of epichlorohydrin, then add 50g of water, increase the temperature to 80°C and stir the reaction for 1.5h to obtain Intermediate A.

[0048] Step 2: Take 40 g of Intermediate A and add it to the reactor, add hydrochloric acid to adjust the pH to 7.0, then add 22 g of tetradecyl dimethyl tertiary amine, then add 78 g of water, and react for 2 hours under reflux.

[0049] Step 3: Pu...

Embodiment 3

[0059] An oligomeric surfactant cleaning fracturing fluid, which is composed of the following components in mass percentage:

[0060]

[0061] Among them, the molecular formula of oligomeric polyalkyl polyquaternary ammonium salt cationic surfactant is as follows:

[0062]

[0063] Where: R 1 Is a straight-chain saturated long-chain alkyl group containing 16 carbon atoms; R 2 Is methyl; X - For Cl - .

[0064] The preparation method of this embodiment includes the following steps:

[0065] Step 1. Weigh 15g of diethylamine into the reaction vessel and slowly add 20m 5mol·L dropwise -1 Hydrochloric acid and 37g of epichlorohydrin, then add 50g of water, increase the temperature to 80°C and stir the reaction for 1.5h to obtain Intermediate A.

[0066] Step 2: Take 40g of Intermediate A and add it to the reactor, add hydrochloric acid to adjust the pH to 7.0, then add 23g of cetyldimethyl tertiary amine, then add 78g of water, and react for 2h under reflux.

[0067] Step 3: Purify the prepa...

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Abstract

The invention relates to an oligomer surfactant clean fracturing fluid and a preparation method thereof. The fracturing fluid is composed of the following components in percentage by mass: 0.5-5% of oligo polyalkyl polyquaternary ammonium salt cationic surfactant, 1-5% of inorganic counter ion, 1-5% of organic counter ion, 0.5-2% of cosolvent and 83-97% of water. The preparation method comprises the following steps: preparing the oligo polyalkyl polyquaternary ammonium salt cationic surfactant, sufficiently dissolving the oligo polyalkyl polyquaternary ammonium salt cationic surfactant and cosolvent in water, adding the inorganic counter ion and organic hydrochloric acid counter ion, and stirring to obtain the oligomer surfactant clean fracturing fluid. Compared with the surfactant used by the existing viscoelastic surfactant clean fracturing fluid, the oligo polyalkyl polyquaternary ammonium salt cationic surfactant provided by the invention has the advantages of simple synthesis technique and short synthesis period.

Description

Technical field [0001] The invention relates to the technical field of oil and gas field fracturing and increasing production, in particular to an oligomeric surfactant cleaning fracturing fluid and a preparation method thereof. It is a synthesis process of oligomeric polyalkyl polyquaternary ammonium salt cationic surfactants and is suitable for Clean fracturing of formations at medium and low temperature (60℃~80℃). Background technique [0002] With the discovery of more and more low-permeability oil and gas reservoirs, the development of advanced, mature, adaptable, and supporting reservoir reforming technologies is essential. Due to the particularity of low-permeability oil and gas reservoirs, its seepage characteristics are obviously different from those of medium and high-permeability reservoirs. The fluid seepage in low-permeability porous media has a starting pressure, which has a large seepage resistance and a nonlinear flow. The characteristics, coupled with the high h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/68
Inventor 杨县超董晓军李善建惠建军孟凡宁张明罗立锦
Owner 陕西延长石油(集团)有限责任公司(延长油矿管理局)油气勘探公司
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