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Clean foaming fracturing fluid and preparation method thereof

A technology of cleaning foam and fracturing fluid, which is applied in the field of hydraulic fracturing, can solve problems such as inaccurate fracture data, and achieve the effect of simple and feasible method, low damage and easy access to raw materials

Active Publication Date: 2017-01-04
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the existing microseismic fracture monitoring technologies, microseismic can monitor the widest distance, but the monitored fracture data is not very accurate, that is, it can only provide information related to the location of the fractured formation, and will not monitor To the position where the proppant is placed in the fracturing fluid

Method used

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  • Clean foaming fracturing fluid and preparation method thereof
  • Clean foaming fracturing fluid and preparation method thereof
  • Clean foaming fracturing fluid and preparation method thereof

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preparation example Construction

[0026] The preparation method of the above-mentioned clean foam fracturing fluid comprises the following steps:

[0027] In terms of mass percentage, 0.8% to 1.2% of magnetic nanoparticle dispersion, 0.8% to 1.2% of foaming agent and 3% to 5% of surfactant are added to 92.6% to 95.4% of the first solvent, and Stir to get this clean foam fracturing fluid. Specifically, the first solvent is water. When preparing clean foam fracturing fluid, you only need to add the three substances into the water and stir well. In a preferred embodiment of the present invention, the stirring speed is 5000r / min-10000r / min, and the stirring time is 1min-3min, so as to ensure sufficient foaming of the clean fracturing fluid. The proportion of the clean foam fracturing fluid affects the foam quality of the clean foam fracturing fluid.

[0028] In this embodiment, preferably, during the fracturing operation at the well site, nitrogen is preferably used as the accompanying gas, and the clean foam f...

Embodiment 1

[0032]Under mechanical stirring condition, add 0.125g citric acid to 100ml deionized water to obtain citric acid solution, add 2.15g ferrous chloride tetrahydrate and 4.05g ferric chloride hexahydrate in the citric acid solution to obtain the first solution, heat to 90° C., 22 ml of ammonia water with a mass fraction of 30% was added to the first solution to obtain a second solution. Stir the second solution at 90°C for 2 hours, cool and centrifuge to separate the supernatant of the second solution from the solid-phase substance, wash the separated solid-phase substance with absolute ethanol, and then wash with water, and the washed solid-phase substance The substance is dissolved in the second solvent at a mass concentration of 8% to obtain a nanofluid, and ultrasonic dispersion is used to obtain a stable magnetic nanoparticle dispersion.

[0033] Under mechanical stirring conditions, in 100ml deionized water, add 0.8g of magnetic nanoparticle dispersion, 0.8g of sodium dodec...

Embodiment 2

[0035] Under mechanical stirring condition, add 0.125g citric acid to 100ml deionized water to obtain citric acid solution, add 2.15g ferrous chloride tetrahydrate and 4.2g ferric chloride hexahydrate in the citric acid solution to obtain the first solution, and heat to 88° C., and then add 0.125 g of citric acid to the first solution, and then add 25 ml of ammonia water with a mass fraction of 30% to the first solution to obtain a second solution. Stir the second solution at 88°C for 2.5 hours, cool and centrifuge to separate the supernatant of the second solution from the solid-phase substance, wash the separated solid-phase substance with absolute ethanol, and then wash with water, and the washed solid-phase substance The phase substance is dissolved in the second solvent at a mass concentration of 8% to obtain a nanofluid, and ultrasonic dispersion is used to obtain a stable magnetic nanoparticle dispersion.

[0036] Under mechanical stirring conditions, 0.9 g of magnetic ...

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Abstract

The invention discloses a clean foaming fracturing fluid and a preparation method thereof, and relates to the technical field of hydraulic fracturing. The clean foaming fracturing fluid comprises the following components by mass percent: 0.8-1.2% of a magnetic nanoparticle dispersion, 0.8-1.2% of a foaming agent, 3-5% of a surfactant and 92.6-95.4% of a first solvent. The preparation method comprises the following steps: adding citric acid into a second solvent to obtain a citric acid solution, dissolving ferrous chloride tetrahydrate and ferric chloride hexahydrate into the citric acid solution to obtain a first solution, adding ammonia water into the first solution to obtain a second solution, heating, stirring the second solution, separating to obtain a solid matter generated in the second solution, dissolving the solid matter into water, uniformly dispersing to obtain the magnetic nanoparticle dispersion, adding the magnetic nanoparticle dispersion, the foaming agent and the surfactant into the first solvent, and stirring to obtain the clean foaming fracturing fluid, wherein both the first solvent and the second solvent are water. The clean foaming fracturing fluid has relatively good magnetism, temperature resistance, shearing resistance and sand suspension.

Description

technical field [0001] The invention relates to the technical field of hydraulic fracturing, and in particular to a clean foam fracturing fluid and a preparation method thereof. Background technique [0002] Hydraulic fracturing is one of the important stimulation techniques for unconventional oil and gas reservoirs. As the working fluid in the hydraulic fracturing process, fracturing fluid plays the role of transmitting pressure, forming and extending fractures, and carrying proppant. However, for unconventional low-porosity and low-permeability reservoirs with severe water sensitivity, the entry of conventional water-based fracturing fluid into the formation will reduce the formation permeability and affect the conductivity of fractures. The clean foam fracturing fluid with less water can not only avoid water-sensitive damage, but also has a simple preparation process and can automatically break the gel under formation conditions, so it has a good application prospect. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/70H01F1/44
CPCC09K8/68C09K8/703H01F1/445
Inventor 杨兆中朱静怡李小刚胡家瑜齐双瑜陈雨松
Owner SOUTHWEST PETROLEUM UNIV
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