Method of producing acidic crosslinking agent for CO2 foam compression fracture

Abstract

The invention relates to a fracturing liquid system for an oil and gas field, in particular to a manufacturing method of acid crosslinking agent used for CO2 foam fracturing. The invention is characterized in that the acid crosslinking agent is produced by confecting the raw material in the following weight percentage: 5.0 to 30.0 percent of inorganic zirconium salt; 1.0 to 10.0 percent of organic assistant; 0.1 to 20.0 percent of inorganic assistant; 40.0 to 95.0 percent of water. The invention has the advantages of high crosslinking intensity, low cost, simple manufacturing technique, and easy operation. .

Description

technical field

[0001] The invention relates to an oil and gas field fracturing fluid system, in particular to a CO 2 A method for preparing an acidic crosslinking agent for foam fracturing. Background technique

[0002] CO 2 Foam fracturing fluid is a high-quality and low-damage fracturing fluid system. It has the characteristics of high viscosity, strong sand-carrying ability, low filtration loss, clean fracturing fractures, little damage to reservoirs, and easy flowback. Fracturing stimulation of seepage, low pressure and water sensitive reservoirs. Due to CO 2 The pH value of the foam fracturing fluid is between 3 and 4. Therefore, acidic crosslinks are CO 2 Key technology of foam fracturing fluid. Conventional water-based fracturing fluids cross-link under alkaline or neutral conditions, and break gel under acidic conditions. Aiming at the problem of acidic crosslinking, Lu Yongjun et al. used zirconium oxychloride as a crosslinking agent for acidic crosslinking ...

Examples

Embodiment approach 1

[0019] Embodiment 1: CO of the present invention 2 The acidic crosslinking agent for foam fracturing is a mixture with the weight percentage of the following components:

[0020] Inorganic zirconium salt zirconium sulfate 15.0%; organic auxiliary agent acetylacetone 7.0%; inorganic auxiliary agent hydrochloric acid 3.0%; water 75.0%.

[0021] In the examples, inorganic zirconium salts, organic additives, and inorganic additives belong to commercially available industrial products. The use concentration of inorganic zirconium salts can be selected from 90% to 100%, and the concentration of organic additives can be selected from 50% to 100%. The use concentration of inorganic additives can be selected from 50% to 100%.

Embodiment 1

[0022] Embodiment 1 is the best solution.

Embodiment approach 2

[0023] Embodiment 2: CO of the present invention 2 The acidic crosslinking agent for foam fracturing is a mixture with the weight percentage of the following components:

[0024] Inorganic zirconium salt zirconium tetrachloride 5.0%; organic auxiliary agent glyoxal 10.0%; inorganic auxiliary agent nitric acid 10.0%; water 75.0%.

technical field

[0001] The invention relates to an oil and gas field fracturing fluid system, in particular to a CO 2 A method for preparing an acidic crosslinking agent for foam fracturing. Background technique

[0002] CO 2 Foam fracturing fluid is a high-quality and low-damage fracturing fluid system. It has the characteristics of high viscosity, strong sand-carrying ability, low filtration loss, clean fracturing fractures, little damage to reservoirs, and easy flowback. Fracturing stimulation of seepage, low pressure and water sensitive reservoirs. Due to CO 2 The pH value of the foam fracturing fluid is between 3 and 4. Therefore, acidic crosslinks are CO 2 Key technology of foam fracturing fluid. Conventional water-based fracturing fluids cross-link under alkaline or neutral conditions, and break gel under acidic conditions. Aiming at the problem of acidic crosslinking, Lu Yongjun et al. used zirconium oxychloride as a crosslinking agent for acidic crosslinking ...

Examples

Embodiment approach 1

[0019] Embodiment 1: CO of the present invention 2 The acidic crosslinking agent for foam fracturing is a mixture with the weight percentage of the following components:

[0020] Inorganic zirconium salt zirconium sulfate 15.0%; organic auxiliary agent acetylacetone 7.0%; inorganic auxiliary agent hydrochloric acid 3.0%; water 75.0%.

[0021] In the examples, inorganic zirconium salts, organic additives, and inorganic additives belong to commercially available industrial products. The use concentration of inorganic zirconium salts can be selected from 90% to 100%, and the concentration of organic additives can be selected from 50% to 100%. The use concentration of inorganic additives can be selected from 50% to 100%.

Embodiment 1

[0022] Embodiment 1 is the best solution.

Embodiment approach 2

[0023] Embodiment 2: CO of the present invention 2 The acidic crosslinking agent for foam fracturing is a mixture with the weight percentage of the following components:

[0024] Inorganic zirconium salt zirconium tetrachloride 5.0%; organic auxiliary agent glyoxal 10.0%; inorganic auxiliary agent nitric acid 10.0%; water 75.0%.