Alcohol-base fracturing fluid

Abstract

An alcohol-based fracturing liquid for oil or gal well is prepared from low-carbon alcohol and its thickening agent, water, cross-linking agent, degelating agent, pH regulator and surfactant. It can remove the water locking in stratum, so benefiting the return of liquid from stratum.

Description

1. Technical field:

[0001] The invention relates to a fracturing fluid used in the fracturing stimulation process of an oil well or a natural gas well, specifically an alcohol-based fracturing fluid. 2. Background technology:

[0002] In the existing technology, at present, more than 90% of the fracturing fluids used in the fracturing reconstruction of oil and gas fields are water-based fracturing fluids with water as the dispersion medium. For characteristic oil and gas formations, water-based fracturing fluids have fatal flaws: because the formation pressure coefficient is much lower than the pressure coefficient of water in the wellbore, it is easy to cause difficulty in liquid flowback and increase damage to the formation; due to the formation water lock It is easy to cause the clogging of formation pores and make the fracturing stimulation invalid. 3. Contents of the invention:

[0003] The purpose of the present invention is to provide an alcohol-based fracturing fl...

Examples

specific Embodiment 1

[0045] 10m on site 3 Add 7800Kg of methanol into a container with agitator, slowly add 30Kg of cationic polyacrylamide while stirring, then add 1Kg of zirconium oxychloride, and continue to stir for 10 minutes so that the liquid is fully mixed to form solution A 1 .

[0046] at 2m 3 Add 900Kg of clean water into the container, and slowly add 50Kg of industrial hydrochloric acid and 50Kg of hydrogen peroxide successively while stirring with a pump or a stirrer, and stir to make solution B for later use.

[0047] During fracturing construction, pump solution A 1 At the same time, press solution B with solution A 1 With solution A 1 : solution B = 100 liters: 2.0 liters volume ratio mixed to form methanol jelly fracturing fluid.

specific Embodiment 2

[0048] 10m on site 3 Add 7800Kg of methanol into a container with agitator, and slowly add 30Kg of cationic polyacrylamide while stirring, then add 1Kg of zirconium oxychloride and 100Kg of surfactant respectively, and continue stirring for 10 minutes so that the liquid is fully mixed and formed Solution A 2 .

[0049] Solution B was prepared according to the method in "Specific Example 1" for use.

[0050] During fracturing construction, pump solution A 2 At the same time, solution B, liquid CO 2 Press with solution A 2 With solution A 2 : Solution B: Liquid CO 2 = 100 liters: 2.0 liters: 100 liters volume ratio is mixed to form CO 2 Methanol jelly foam fracturing fluid.

1. Technical field:

[0001] The invention relates to a fracturing fluid used in the fracturing stimulation process of an oil well or a natural gas well, specifically an alcohol-based fracturing fluid. 2. Background technology:

[0002] In the existing technology, at present, more than 90% of the fracturing fluids used in the fracturing reconstruction of oil and gas fields are water-based fracturing fluids with water as the dispersion medium. For characteristic oil and gas formations, water-based fracturing fluids have fatal flaws: because the formation pressure coefficient is much lower than the pressure coefficient of water in the wellbore, it is easy to cause difficulty in liquid flowback and increase damage to the formation; due to the formation water lock It is easy to cause the clogging of formation pores and make the fracturing stimulation invalid. 3. Contents of the invention:

[0003] The purpose of the present invention is to provide an alcohol-based fracturing fl...

Examples

specific Embodiment 1

[0045] 10m on site 3 Add 7800Kg of methanol into a container with agitator, slowly add 30Kg of cationic polyacrylamide while stirring, then add 1Kg of zirconium oxychloride, and continue to stir for 10 minutes so that the liquid is fully mixed to form solution A 1 .

[0046] at 2m 3 Add 900Kg of clean water into the container, and slowly add 50Kg of industrial hydrochloric acid and 50Kg of hydrogen peroxide successively while stirring with a pump or a stirrer, and stir to make solution B for later use.

[0047] During fracturing construction, pump solution A 1 At the same time, press solution B with solution A 1 With solution A 1 : solution B = 100 liters: 2.0 liters volume ratio mixed to form methanol jelly fracturing fluid.

specific Embodiment 2

[0048] 10m on site 3 Add 7800Kg of methanol into a container with agitator, and slowly add 30Kg of cationic polyacrylamide while stirring, then add 1Kg of zirconium oxychloride and 100Kg of surfactant respectively, and continue stirring for 10 minutes so that the liquid is fully mixed and formed Solution A 2 .

[0049] Solution B was prepared according to the method in "Specific Example 1" for use.

[0050] During fracturing construction, pump solution A 2 At the same time, solution B, liquid CO 2 Press with solution A 2 With solution A 2 : Solution B: Liquid CO 2 = 100 liters: 2.0 liters: 100 liters volume ratio is mixed to form CO 2 Methanol jelly foam fracturing fluid.