CN-121972233-A - Emulsion type catalyst for heavy oil aquathermolysis, preparation method and application thereof

CN121972233ACN 121972233 ACN121972233 ACN 121972233ACN-121972233-A

Abstract

The invention discloses an emulsion type catalyst for heavy oil aquathermolysis, a preparation method and application thereof, and belongs to the technical field of petroleum exploitation and catalysis. The catalyst is prepared by adding a molybdenum-based catalyst, an emulsifying agent and emulsion oil into water, and performing ultrasonic emulsification to obtain the thickened oil aquathermolysis emulsion catalyst. The emulsion catalyst prepared by the invention is a nano molybdenum catalytic system with high stability, low oil phase ratio, wide pH adaptation range and good salt tolerance, has good dispersibility and transmission capacity in an oil-water reaction system, and has higher catalytic cracking activity on underground thickened oil, thereby having good applicability and better application value in the technical field of petroleum exploitation.

Inventors

WANG JIQIAN
ZHONG YUCHEN
Zhao Hongzuo
MA SHAOJUN
WANG DONG
CHAI YONGMING
LI BINFEI

Assignees

中国石油大学(华东)

Dates

Publication Date: 20260505
Application Date: 20260331

Claims (10)

1. The emulsion type catalyst for the hydrothermal cracking of the thickened oil is characterized by being prepared by adding a molybdenum-based catalyst, an emulsifier and emulsion oil into water, and performing ultrasonic emulsification to obtain the emulsion type catalyst for the hydrothermal cracking of the thickened oil.
2. The emulsion type catalyst for aquathermolysis of thickened oil according to claim 1, wherein the raw materials are selected from the group consisting of 0.005-0.1 part by weight of molybdenum-based catalyst, 0.1-0.5 part by weight of emulsifier, 1-10 parts by weight of emulsion oil and 10-50 parts by weight of water.
3. The emulsion catalyst for aquathermolysis of thickened oil according to claim 1, wherein the emulsifier is at least one of sodium dodecyl benzene sulfonate, saponin and sodium hexadecyl benzene sulfonate, and the emulsion oil is at least one of n-heptane, industrial white oil and diesel oil.
4. The emulsion catalyst for aquathermolysis of thickened oil according to claim 1, wherein the condition of ultrasonic emulsification is 100-200 w ultrasonic emulsification for 10-20 min.
5. Emulsion catalyst for the hydrothermal cracking of heavy oil according to claim 1, characterized in that the molybdenum-based catalyst is prepared by the following method: Adding molybdenum-containing precursor, sulfur source and morphology regulator into water, stirring and dissolving, then carrying out hydrothermal reaction, centrifuging after the reaction is finished, washing, and drying to obtain the molybdenum-based catalyst.
6. The emulsion catalyst for aquathermolysis of thickened oil according to claim 5, wherein the molybdenum-containing precursor is at least one of molybdenum trioxide, ammonium molybdate and ammonium tetrathiomolybdate, the sulfur source is at least one of thiourea and sodium sulfide, and the morphology regulator is at least one of polyvinylpyrrolidone, cetyltrimethylammonium bromide and ethylenediamine.
7. The emulsion catalyst for aquathermolysis of thickened oil according to claim 5, which is characterized in that the raw materials are selected from the following raw materials, by mass, 0.1-1 part of molybdenum-containing precursor, 0.1-5 parts of sulfur source, 0.1-1 part of morphology regulator and 50-200 parts of water.
8. The emulsion catalyst for aquathermolysis of thickened oil according to claim 5, wherein the hydrothermal reaction is carried out at 150-200 ℃ for 10-24 hours.
9. Use of the emulsion catalyst according to any one of claims 1-8 in underground in situ upgrading and viscosity reduction of heavy oil.
10. The underground in-situ modification and viscosity reduction method for the thickened oil is characterized by comprising the following steps of: The emulsion catalyst and the hydrogen donor agent as defined in any one of claims 1-8 are injected into underground thick oil, the pressure is kept at 1-1.5 MPa, the temperature is raised to 180-250 ℃, and the stirring reaction is continued for 18-36 h at 100-150 r/min, so that the underground in-situ modification and viscosity reduction of the thick oil are realized.

Description

Emulsion type catalyst for heavy oil aquathermolysis, preparation method and application thereof Technical Field The invention belongs to the technical field of petroleum exploitation and catalysis, and particularly relates to an emulsion type catalyst for heavy oil aquathermolysis, a preparation method and application thereof. Background For deep thickened oil with huge reserves, an efficient and rapid exploitation mode is becoming a global research focus. However, the thick oil is rich in long-chain and cyclic thick ring compounds such as colloid and asphaltene, so that the thick oil has the characteristics of high relative density, poor fluidity and high viscosity, and the reservoir environment factors are complex, so that the thick oil is difficult to exploit and transport. The heavy oil in-situ catalytic extraction can introduce the catalyst into an oil reservoir to catalyze in-situ heavy oil cracking, so that the viscosity and density are reduced, the petroleum fluidity is enhanced, and the recovery ratio is improved. This method is considered a key direction for future heavy oil recovery because it minimizes environmental impact and energy consumption. However, the thickened oil aquathermolysis catalyst in the prior art has the defects of insufficient catalytic activity, poor system stability, high oil phase consumption, limited environmental adaptability, low dispersing and transferring efficiency in an oil-water reaction system and the like. Therefore, the emulsion type thick oil aqua-thermolysis catalyst with high catalytic activity, low oil phase ratio, high stability, wide pH adaptation range and good salt tolerance is provided, and has important significance. Disclosure of Invention The invention provides an emulsion type catalyst for the hydrothermal cracking of thick oil, which is prepared by adding a molybdenum-based catalyst, an emulsifying agent and emulsion oil into water, and performing ultrasonic emulsification to obtain the emulsion type catalyst for the hydrothermal cracking of the thick oil. In the preparation method of the emulsion type catalyst, the raw materials are selected from the following components, by mass, 0.005-0.1 part of a molybdenum-based catalyst, 0.1-0.5 part of an emulsifier, 1-10 parts of emulsion oil and 10-50 parts of water. In the preparation method of the emulsion catalyst, the dosage of the emulsifier is 0.1-0.5% of the total mass of the emulsion catalyst. In the preparation method of the emulsion type catalyst, the dosage of the emulsion oil is 5-20% of the total mass of the emulsion type catalyst, preferably 8-15%, and more preferably 10%, so that the emulsion system still has higher stability and good dispersion performance while the dosage of the oil phase and the cost of the solvent are kept low. In the preparation method of the emulsion catalyst, the emulsifier is at least one of sodium dodecyl benzene sulfonate, saponin and sodium hexadecyl benzene sulfonate. In the preparation method of the emulsion catalyst, the emulsion oil is at least one of n-heptane, industrial white oil and diesel oil. In the preparation method of the emulsion type catalyst, the ultrasonic emulsification condition is 100-200W ultrasonic emulsification for 10-20 min. In the preparation method of the emulsion catalyst, the molybdenum-based catalyst is prepared by the following method: Adding molybdenum-containing precursor, sulfur source and morphology regulator into water, stirring and dissolving, then carrying out hydrothermal reaction, centrifuging after the reaction is finished, washing, and drying to obtain the molybdenum-based catalyst. In the preparation method of the molybdenum-based catalyst, the molybdenum-containing precursor is at least one of molybdenum trioxide, ammonium molybdate and ammonium tetrathiomolybdate. In the preparation method of the molybdenum-based catalyst, the sulfur source is at least one of thiourea and sodium sulfide. In the preparation method of the molybdenum-based catalyst, the morphology regulator is at least one of polyvinylpyrrolidone, cetyltrimethylammonium bromide and ethylenediamine. In the preparation method of the molybdenum-based catalyst, the raw materials comprise, by mass, 0.1-1 part of a molybdenum-containing precursor, 0.1-5 parts of a sulfur source, 0.1-1 part of a morphology regulator and 50-200 parts of water. In the preparation method of the molybdenum-based catalyst, the hydrothermal reaction condition is that the reaction is carried out for 10-24 hours at 150-200 ℃. The invention provides application of the emulsion catalyst in underground in-situ modification and viscosity reduction of thickened oil. The invention provides a method for underground in-situ modification and viscosity reduction of thick oil, which comprises the following steps: And (3) injecting the emulsion catalyst and the hydrogen donor tetrahydronaphthalene into the underground thick oil, keeping the pressure at 1-1.5 MPa, heating to 180-250 ℃, and continuou