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A supercritical carbon dioxide reverse-phase association fracturing fluid, and a preparing method and application thereof

A technology of carbon dioxide and fracturing fluid, which is applied in the direction of chemical instruments and methods, earth drilling, drilling compositions, etc., can solve the problems of poor sand carrying effect, high price, unfriendly environment, etc., and achieves convenient system construction, Improve the utilization effect and enhance the recovery effect

Active Publication Date: 2018-11-30
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the viscosity of supercritical carbon dioxide is low, and the sand-carrying effect is poor, which is the technical bottleneck restricting the development of shale gas by supercritical carbon dioxide
Fluorine-containing surfactants and polymers are considered to be the most effective supercritical carbon dioxide tackifiers at present, but due to their environmental unfriendliness, a large amount of use will cause pollution to the formation, and their high prices make this type of The use of fluorine-containing amphiphiles in supercritical carbon dioxide systems is still limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A supercritical carbon dioxide reverse-phase association fracturing fluid, the reverse-phase association fracturing fluid is a supercritical carbon dioxide-in-water reverse-phase association structure, including a carbon dioxide phase and a water phase, wherein the volume ratio of the carbon dioxide phase to the water phase is It is 8:2.

[0035] The water phase is composed of a fluorine-containing surfactant, a cosolvent and water, wherein the mass ratio of the fluorine-containing surfactant to the co-solvent is 10:1, and the concentration of the fluorine-containing surfactant is 0.05mol / L; The fluorine-containing surfactant is 1,4-bis(4,4,5,5-pentafluoropentyl)-3-(4,4,5,5-pentafluoropentyloxycarbonyl)-1,4- Dioxobutane-2-sodium sulfonate, the cosolvent is sodium p-ethylbenzoate.

[0036] The preparation method comprises the following steps:

[0037] (1) After mixing the co-solvent or co-surfactant with the fluorine-containing surfactant, add water in proportion, and ...

Embodiment 2

[0041] A supercritical carbon dioxide reverse phase association fracturing fluid, the same as described in Example 1, the difference is: the fluorine-containing surfactant is two (4,4,5,5-pentafluoropentyl)- 2-sodium sulfosuccinate, the cosolvent is sodium p-octylformate.

[0042] The preparation method is the same as in Example 1.

[0043] Under the test temperature of 45°C and test pressure of 35MPa, the intrinsic viscosity of the supercritical carbon dioxide reverse association system prepared by it can reach 5.0-6.5g / ml, and the viscosity of the reverse micellar solution of the system is the same as that of the supercritical The relative viscosity ratio of carbon dioxide viscosity is 1.20-1.30, and the total fluorine content of the system is 25%-35%.

Embodiment 3

[0045] A supercritical carbon dioxide reverse phase association fracturing fluid, the same as described in Example 1, the difference is: the fluorine-containing surfactant is two (4,4,5,5-pentafluoropentyl)- 2-sodium sulfosuccinate, the cosolvent is sodium p-ethylbenzoate.

[0046] The preparation method is the same as in Example 1.

[0047] Under the test temperature of 45°C and test pressure of 35MPa, the intrinsic viscosity of the supercritical carbon dioxide reverse association system prepared by it can reach 6.0-8.5g / ml, and the viscosity of the reverse micellar solution of the system is the same as that of the supercritical The relative viscosity ratio of carbon dioxide viscosity is 1.25-1.40, and the total fluorine content of the system is 20%-30%.

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Abstract

The invention relates to a supercritical carbon dioxide reverse-phase association fracturing fluid, and a preparing method and application thereof. The fracturing fluid has a reverse-phase associationstructure in which water is covered with supercritical carbon dioxide, and includes a carbon dioxide phase and a water phase, wherein the volume ratio of the carbon dioxide phase to the water phase is (7-9):(1-3), and the water phase comprises a fluorine-containing surfactant, a cosolvent or a cosurfactant and water. The viscosity of the supercritical carbon dioxide phase is improved, the fluorine content of the system is reduced, and the fracturing fluid is used for increasing the recovery efficiency of shale gas. The fracturing fluid is more environmentally friendly and higher in practicability, and can be effectively used for shale gas extraction through supercritical carbon dioxide displacement.

Description

technical field [0001] The invention relates to a supercritical carbon dioxide reverse-phase association fracturing fluid and its preparation method and application, belonging to the technical field of oil and gas development. Background technique [0002] With the increasing demand for global energy, the exploitation of unconventional oil and gas reservoirs has attracted more and more attention, among which the exploitation of shale gas has led a new energy revolution. China is rich in shale gas resources, and its technologically exploitable resources rank first in the world. my country is also the third country to successfully realize shale gas exploitation and commercial application after the United States and Canada. In 2016, my country's shale gas production reached 7.882 billion cubic meters, and the "Shale Gas Development Plan (2016-2020)" issued by the National Energy Administration also proposed to strive to achieve 30 billion cubic meters of shale gas production in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/594E21B43/26E21B43/22
CPCC09K8/594C09K8/68E21B43/166E21B43/26Y02P20/54
Inventor 李英孙浩洋
Owner SHANDONG UNIV
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