CN-121991667-A - Film-forming type thickened oil cleaning agent and application thereof

Abstract

The invention discloses a film-forming thickened oil cleaning agent and application thereof, and belongs to the technical field of underground working fluids. The thick oil cleaning agent consists of a surfactant, an emulsifying agent and a film forming agent. Mixing the water with the water to prepare the well-flushing liquid. According to the invention, the surfactant and the emulsifier are compounded, the film forming agent is introduced, and the method of combining chemical cleaning and chemical film forming is utilized, so that a strong hydrophilic film is formed on the basis of effectively removing thick oil attached to the pipe wall, the oil film is effectively prevented from being attached to the pipe wall for the second time, and the cleaning efficiency is high. The invention is suitable for cleaning the organic scale of the oil pipe.

Inventors

• ZHANG WEI
• Xia Qiantong
• LIU XIAOLIN
• LIU YANJUN
• YANG DONG
• REN YONGQIANG
• LIANG BANG
• LI JIN
• WU SHUHE
• ZHANG YI
• YU ZHIHAI
• TIAN ZHENLONG

Assignees

• 中国石油集团渤海钻探工程有限公司
• 中国石油天然气集团有限公司

Dates

Publication Date

20260508

Application Date

20241107

Claims (5)

1. 1. The film-forming thickened oil cleaning agent is characterized in that the raw materials for preparing the effective components of the film-forming thickened oil cleaning agent comprise a surfactant, an emulsifying agent and a film-forming agent.
2. 2. The film-forming thickened oil cleaning agent according to claim 1, wherein the surfactant accounts for 60-70% by weight, the emulsifier accounts for 15-20% by weight, and the balance is film-forming agent.
3. 3. The film-forming thickened oil cleaning agent according to claim 1 or 2, wherein the surfactant comprises sodium dodecyl benzene sulfonate or sodium dodecyl sulfate, the emulsifier comprises tween 80, and the film-forming agent comprises heptadecenyl amine ethyl imidazoline quaternary ammonium salt.
4. 4. The application of the film-forming type thick oil cleaning agent is characterized in that water and the film-forming type thick oil cleaning agent are mixed to prepare well cleaning liquid.
5. 5. The use of a film-forming thickened oil cleaner as claimed in claim 4, wherein the weight ratio of water to film-forming thickened oil cleaner is 100:1.

Description

Film-forming type thickened oil cleaning agent and application thereof Technical Field The invention belongs to the technical field of underground working fluid, and relates to a thickened oil cleaning agent, in particular to a film-forming thickened oil cleaning agent and application thereof. Background In the oilfield production process, as the crude oil flows from the bottom of the well to the surface, the temperature gradually decreases, resulting in the deposition of heavy components such as paraffin and asphaltene in the crude oil on the surfaces of the oil pipe and the sucker rod to form organic scale. The presence of such deposits not only prevents the normal production of the well, but may also create barriers to other operations that the well may take, such as plugging water or increasing perforations. Therefore, regular well cleanup operations are critical to maintaining smooth production of the well. The goal of well cleanup operations is to remove these organic deposits to ensure the production efficiency of the well. At present, most of oil fields in China commonly use diesel oil or other organic cleaning agents in well flushing operation, and the method is high in cost and cannot neglect influence on environment. The use of organic cleaning agents presents a number of environmental problems, such as soil and groundwater contamination, and disposal of these hazardous chemicals. In addition, the organic solvent remained on the extracted oil pipe and sucker rod can pollute the ground well site, and the repairing burden of the environment is increased. For example, the well-flushing liquid disclosed in the chinese patent application No. CN202110414049.1 contains 30-70% dimethyl ether. In response to these challenges, students focus on efficient and environment-friendly water-based well-flushing fluids, and do a lot of research work to optimize and combine interface wetting reversal agents and emulsifiers, but the current cleaning efficiency of water-based well-flushing fluids is still not high, and when the water-based well-flushing fluids are used, the well-flushing fluids need to be heated to 80 ℃ or above, and even so, a thick oil film still adheres to the pipe wall after cleaning. In summary, with the increase of environmental protection requirements for oil field development and the increase of pressure for operation cost control, the development of an efficient and environment-friendly water-based cleaning agent is an urgent problem to be solved by the industry. Disclosure of Invention The invention aims to provide a film-forming thickened oil cleaning agent and application thereof, so as to solve the problems of low cleaning efficiency, high energy consumption, environmental pollution and the like of the conventional thickened oil cleaning agent. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the film-forming thick oil cleaning agent comprises the raw materials of surfactant, emulsifying agent and film forming agent. As a limitation, the surfactant accounts for 60-70 wt%, the emulsifier accounts for 15-20 wt% and the rest is film forming agent. As another limitation, the surfactant includes sodium dodecyl benzene sulfonate or sodium dodecyl sulfate, the emulsifier includes tween 80, and the film forming agent includes heptadecenyl amine ethyl imidazoline quaternary ammonium salt. The invention also provides application of the film-forming thickened oil cleaning agent, which is to mix water and the film-forming thickened oil cleaning agent to prepare well-flushing liquid. As a limitation, the weight ratio of the water to the film-forming thickened oil cleaning agent is 100:1. By adopting the technical scheme, compared with the prior art, the invention has the following technical progress: The film-forming type thickened oil cleaning agent provided by the invention is compounded by using the surfactant and the emulsifier, introduces the film-forming agent, forms a strong hydrophilic film on the basis of effectively removing thickened oil attached to the pipe wall by using a chemical cleaning-chemical film-forming combined method, effectively prevents oil films from being attached to the pipe wall for the second time, has the thickened oil cleaning efficiency of more than 95%, and is free of chemical reagents with environmental pollution, and is environment-friendly. Detailed Description The invention is further illustrated by the following examples. It should be understood that the described embodiments are only for explaining the present invention and do not limit the present invention. The experimental methods used in the examples described below are conventional in the art unless otherwise specified. Materials, reagents and the like used in the examples described below are commercially available unless otherwise specified. Example 1 The embodiment discloses a film-forming thickened oil cleaning agent which consists of 60wt% of sodium do