Biological and chemical composite blockage removing agent and preparation process and use thereof

Patent metadata

Field	Value
Publication number	US-12344795-B2
Application number	US-202017771185-A
Country	US
Kind code	B2
Filing date	Oct 23, 2020
Priority date	Oct 24, 2019
Publication date	Jul 1, 2025
Grant date	Jul 1, 2025

Abstract

The present invention relates to a biological and chemical composite blockage removing agent and preparation process and use thereof, and mainly solves the problems that the existing blockage removing agents have poor blockage removal effect on organic blockages, cause damage to formations and oil-wells, produce serious environmental pollution, and corrode the equipment, pipelines, and the like. The problems can be well solved by using a technical solution of a biological and chemical composite blockage removing agent, which contains the following components in parts by mass: A. 10-50 parts of a biosurfactant; B. 5-20 parts of a chemical surfactant; wherein the chemical surfactant is an anionic-nonionic surfactant, and said technical solution can be used in the industrial production for removing the blockage in the oilfield, and reducing the injection pressure and increasing the injection.

First claim

The invention claimed is:

1. A biological and chemical (B&C) composite blockage removing agent, which comprises the following components in parts by mass:
A. 10-50 parts of a biosurfactant, the biosurfactant being at least one selected from lipopeptide, rhamnolipid, trehalose lipid, sophorolipid, gramicidin, alkyl polyglycoside, saponin, and cyclodextrin;
B. 5-20 parts of a chemical surfactant;
C. 1-30 parts of a synergist; the synergist being at least one of ethylene glycol, and glycerol; and
D. more than 0 to 84 arts of water as a solvent,
wherein the chemical surfactant is an anionic-nonionic surfactant;
the anionic-nonionic surfactant is a hydrocarbyl polyoxyethylene polyoxypropylene ether acid salt, and the hydrocarbyl polyoxyethylene polyoxypropylene ether acid salt has a general formula in the following structure:

wherein R 1 is an optionally substituted C 4-40 linear or branched alkyl, an optionally substituted C 4-40 monocyclic or polycyclic cycloalkyl, an optionally substituted C 4-40 linear or branched alkenyl, an optionally substituted C 6-40 aryl, R 2 is an optionally substituted C 1-20 linear or branched alkylene, an optionally substituted C 4-40 monocyclic or polycyclic cycloalkylene, an optionally substituted C 4-40 linear or branched alkenylene, an optionally substituted C 6-40 arylene, the “optionally substituted” refers to optionally substituted by one or more substituents selected from hydroxyl, C 1-20 linear or branched alkyl, C 5-10 monocyclic or polycyclic cycloalkyl, C 2-20 linear or branched alkenyl and C 6-20 aryl, a sum of a carbon atom number in R 1 and a carbon atom number in R 2 is 6-50; m and n are each an arbitrary number in a range of 0-60 and are not both 0 at the same time, X is one of carboxylate radical, sulfate radical, phosphate radical, and sulfonate radical, Y is one of Na + , K + , Mg 2+ , Ca 2+ , and NH 4 + , a is an absolute value of X's valence, b is an absolute value of Y's valence.

2. The B&C composite blockage removing agent according to claim 1 , wherein in the hydrocarbyl polyoxyethylene polyoxypropylene ether acid salt, the carbon atom number of the hydrocarbyl moiety except the carbon atom number in the EO unit, the PO unit, and the acid group is 6-50.

3. A process for preparing the B&C composite blockage removing agent according to claim 1 , which comprises the following steps:
mixing a biosurfactant, a chemical surfactant, optionally a synergist, and water to obtain the B&C composite blockage removing agent.

4. A method for removing the blockage of crude oil, comprising utilizing the B&C composite blockage removing agent according to claim 1 .

5. The method according to claim 4 , wherein, in terms of the total mass concentration of the biosurfactant and the chemical surfactant, the concentration of the B&C composite blockage removing agent when in use is 0.001%-5%.

6. The process according to claim 3 , wherein at first, any one of the biosurfactant and the chemical surfactant is added, and then another one is added, or the biosurfactant and the chemical surfactant are both added at the same time.

7. A blockage removing agent composition, which contains the B&C composite blockage removing agent according to claim 1 , relative to the total mass of the composition, in terms of the total mass concentration of the biosurfactant and the chemical surfactant, the concentration of the B&C composite blockage removing agent is 0.001%-5%.

8. A method for removing the blockage of crude oil, comprising utilizing the blockage removing agent composition according to claim 7 .

Assignees

• China Petroleum & Chem Corp
• Shanghai Res Inst Petrochemical Tech Sinopec

Inventors

• Meng Yong
• Li Yingcheng
• Zhang Weidong
• Sha Ou
• Bao xinning
• Jin Jun
• Wu Xinyue

Classifications

• C09K8/528

  inorganic depositions, e.g. sulfates or carbonates · CPC title

• C09K8/582

  characterised by the use of bacteria · CPC title

• C09K8/584

  characterised by the use of specific surfactants · CPC title

• C09K8/524 Primary

  organic depositions, e.g. paraffins or asphaltenes · CPC title