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Microemulsion-type fracture acidizing cleanup additive, and preparation method and application thereof

A technology of fracturing acidification and drainage aids, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of insurmountable reservoir damage and complicated preparation, and achieve the restoration of reservoir permeability and simple preparation process , The effect of stable product performance

Inactive Publication Date: 2011-07-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of this patent is complicated, and it cannot overcome the obvious shortcomings of reservoir damage caused by water lock, residue and incompatibility of formation fluids in the oil and gas well near wellbore during the fracturing and acidizing process of oil and gas wells

Method used

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  • Microemulsion-type fracture acidizing cleanup additive, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A microemulsion type fracturing acidification drainage aid, the components and mass parts are as follows:

[0029] Sodium dodecylbenzene sulfonate: 5 parts; n-butanol: 4 parts; kerosene: 41 parts; water: 42 parts; sodium chloride: 8 parts.

[0030] Weigh sodium dodecylbenzene sulfonate, n-butanol, kerosene, water, and sodium chloride according to the above-mentioned mass parts and mix and stir them evenly, and then let stand for 1~3h to obtain microemulsion type fracturing acidification aid. Agent.

[0031] The microemulsion type fracturing acidification drainage aid is added according to the ratio of 0.7% of the mass of the fracturing acidification fluid, and the mixture is uniformly mixed and pumped into the bottom layer.

[0032] After testing, the density, interfacial tension, surface tension, reservoir permeability repair rate and other test data of the microemulsion fracturing acidification drainage aid are shown in Table 1.

Embodiment 2

[0034] The microemulsion type fracturing acidification drainage aid as described in Example 1, except that the components and mass parts are as follows:

[0035] Sodium fatty acid methyl sulfonate: 6 parts; isobutanol: 5 parts; kerosene: 42 parts; water: 42 parts; sodium chloride: 5 parts.

[0036] The microemulsion type fracturing acidification drainage aid is added according to the ratio of 0.5% of the mass of the fracturing acidification fluid, and the mixture is uniformly mixed and pumped into the bottom layer.

[0037] After testing, the test data of interfacial tension, surface tension, and reservoir permeability repair rate of the microemulsion fracturing acidification drainage aid are shown in Table 1.

Embodiment 3

[0039] The microemulsion type fracturing acidification drainage aid as described in Example 1, except that the components and mass parts are as follows:

[0040] Sodium lauryl sulfate: 7 parts; n-pentanol: 6 parts; white oil: 40 parts; water: 40 parts; potassium chloride: 7 parts.

[0041] Add the microemulsion type fracturing acidification drainage aid according to the proportion of 0.4% of the mass of the fracturing acidification fluid, mix it evenly and pump it into the bottom layer.

[0042] After testing, the test data of interfacial tension, surface tension, and reservoir permeability repair rate of the microemulsion fracturing acidification drainage aid are shown in Table 1.

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Abstract

The invention relates to a microemulsion-type fracture acidizing cleanup additive, and a preparation method and application thereof, belonging to the technical field of petrochemical industry. The microemulsion-type fracture acidizing cleanup additive is prepared from the following components in percentage by weight:5-10% of surfactant, 2-8% of cosurfactant, 35-45% of oil phase, 35-45% of water phase and 3-10% of inorganic electrolyte. The microemulsion-type fracture acidizing cleanup additive provided by the invention has a function of restoring reservoir permeability; and compared with the existing cleanup additive system, the microemulsion-type fracture acidizing cleanup additive provided by the invention can reduce the degree of reservoir damage, which is caused by incompatibility of water locks, residues and formation fluids in the wellbore area of an oil well in the fracture acidizing process of an oil and gas well, by more than 50%.

Description

Technical field [0001] The invention relates to a microemulsion type fracturing acidification drainage aid and a preparation method and application thereof, belonging to the technical field of petrochemical industry. Background technique [0002] Microemulsion is a homogeneous, transparent or translucent, thermodynamically stable dispersion system formed spontaneously by surfactants, co-surfactants, oil and water. It has ultra-low interfacial tension, very small nanoparticles and super-increasing Solubility. Microemulsions are mainly used in fields such as enhanced oil recovery, microemulsion membranes, microemulsion pesticides, microemulsion capsules, microemulsion detergents, microemulsion cosmetic liquids, and nanomaterial preparation. In the 1960s, microemulsion systems began to be used in tertiary oil recovery. The oil crisis in the 1970s accelerated the application of microemulsions in oil fields. Microemulsion tertiary oil recovery is theoretically feasible, but the requ...

Claims

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Application Information

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IPC IPC(8): C09K8/60
Inventor 罗明良刘佳林温庆志贾自龙孙厚台刘洪见
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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