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Twin cationic surface active agent and viscoelastic fracturing fluid containing same

A technology of surfactants and cations, which is applied in the field of oil and gas wells, can solve the problems of poor flowback ability of fracturing fluid, incomplete gel breaking, and large damage to reservoirs, etc., achieve good sand-carrying properties, and the liquid preparation method is simple and convenient. Good sand carrying performance

Inactive Publication Date: 2010-12-01
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a fracture-making and sand-carrying medium, the performance improvement of fracturing fluid has always been a subject of research. The fracturing fluid is used in the formation of single additives, the formation of the overall fracturing fluid formula system, laboratory research equipment and methods, and field application technology. Significant changes have taken place in many aspects. At present, most of the fracturing fluids widely used at home and abroad are polymers, which have a good fracturing effect. However, polymer fracturing fluids have poor flowback ability and cause great damage to reservoirs. , when the gel is broken during fracturing, due to the influence of mass transfer, the gel breaking is not complete, and many gels adhere to the reservoir, causing permanent damage to the reservoir

Method used

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  • Twin cationic surface active agent and viscoelastic fracturing fluid containing same
  • Twin cationic surface active agent and viscoelastic fracturing fluid containing same
  • Twin cationic surface active agent and viscoelastic fracturing fluid containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A viscoelastic fracturing fluid containing a gemini cationic surfactant, the preparation method of which is as follows:

[0042] In 100g water, add 0.1g dichloro-bis(octadecyldimethyl)butylammonium, 0.1g salicylic acid, 0.05g sodium hydroxide, 0.2g ammonium chloride under stirring, stir 30nin, observe A viscoelastic system is formed to obtain a viscoelastic fracturing fluid. The fracturing fluid prepared in this example is sheared at 170 s-1 for 10 min, has a viscosity of 24 mPa.s, and has sand-carrying ability.

Embodiment 2

[0044] A viscoelastic fracturing fluid containing a gemini cationic surfactant, the preparation method of which is as follows:

[0045] In 100g of water, add 0.3g of dibromo-bis(hexadecyldihydroxyethyl)ethylenediammonium, 0.1g of sulfosalicylic acid, 0.1g of p-toluenesulfonic acid, 0.15g of potassium hydroxide under stirring , 0.2g ammonium chloride, stirred for 30nin, observed to form a viscoelastic system, and obtained a viscoelastic fracturing fluid. The fracturing fluid prepared in this embodiment was -1 After shearing for 10 minutes, the viscosity is 35mPa.s and has sand-carrying ability.

Embodiment 3

[0047] A viscoelastic fracturing fluid containing a gemini cationic surfactant, the preparation method of which is as follows:

[0048] In 100g of water, add 1.0g of dichloro-bis(octadecyldimethyl)ethylenediammonium, 0.7g of toluenesulfonic acid, 0.7g of phthalic acid, 0.7g of sodium hydroxide under stirring, and stir for 30nin , it was observed that a viscoelastic system was formed to obtain a viscoelastic fracturing fluid. The fracturing fluid prepared in this example was -1 After shearing for 10 minutes, the viscosity is 85mPa.s, and it has the ability to carry sand.

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Abstract

The invention relates to a twin cationic surface active agent and a viscoelastic fracturing fluid containing same, wherein the twin cationic surface active agent has the following general formula, wherein R group is alkyl group of C2-C6, R1 and R2 group are alkyl group, alkyl alkenyl group and alkyl arene of C12-C20, R3 and R4 group are alkane and alkyl alcohol of C1-C3, and X group is chlorine or bromine. The viscoelastic fracturing fluid comprises the components by mass percent: 0.1-2.0% of twin cationic surface active agent, 0.1-5.0% of B, 0.05-5.0% of C and balance water. The prepared viscoelastic fracturing fluid has the characteristics of low viscosity, good proppant carrying capacity, no residue and the like, has the effective proppant carrying capacity in the fracture construction, reduces the damage for stratum, improves the width generation capacity, effectively controls the height and the width of a gap, and is very suitable for popularization and application in the oil and gas field.

Description

technical field [0001] The invention belongs to the technical field of oil and gas wells, and relates to a fracturing fluid, in particular to a twin cationic surfactant and a viscoelastic fracturing fluid containing the surfactant. Background technique [0002] my country's oil reserves are very high, but most of them belong to low-permeability oil and gas wells, which greatly reduces the effective exploitation. The hydraulic fracturing stimulation technology of oil and gas wells is an effective method to transform oil and gas layers, and is an effective measure for oil and gas wells to increase production. [0003] As a fracture-making and sand-carrying medium, the performance improvement of fracturing fluid has always been a subject of research. The fracturing fluid is used in the formation of single additives, the formation of the overall fracturing fluid formula system, laboratory research equipment and methods, and field application technology. Significant changes have ...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 郭丽梅丁云宏管保山梁丽刘萍胥云邱晓慧刘玉婷
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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