Cleaning agent for heat cleaning of wellhole and preparation method thereof

Abstract

The invention relates to a cleaning agent for heat cleaning of wellhole. The cleaning agent comprises the following components, by weight: 10-30 parts of Ninol, 1-10 parts of a penetrating agent JFC, 1-5 parts of a demulsifier AE8031, 10-30 parts of ethylene glycol monobutyl ether; 5-15 parts of HEDTA and 30-50 parts of water. The preparation method comprises the steps of: (1) dissolving HEDTA in water, and stirring until complete dissolving; and (2) adding ethylene glycol monobutyl ether into the solution from the step (1), stirring evenly, successively adding Ninol, penetrating agent JFC and demulsifier AE8031, and stirring evenly to obtain a finished product. The components of Ninol, penetrating agent JFC, demulsifier AE8031 and ethylene glycol monobutyl ether in the cleaning agent are all surfactants; HEDTA has descaling and scale inhibition function, so that the cleaning agent provided by the invention has the functions of surface activity, descaling and scale inhibition, and is suitable for cleaning of oil tubes in heavy oil heavy oil fields, and also has the function of environmental protection.

Description

technical field [0001] The invention belongs to the technical field of chemicals used in the petroleum industry, and relates to an oil well cleaning agent, in particular to a cleaning agent for wellbore thermal cleaning and a preparation method thereof. Background technique [0002] During the production process of the oil well, asphalt, wax and other substances will slowly adsorb on the outside of the oil pipe to form oil scale. For heavy heavy oil, this situation is more serious. During the workover operation, in order to prevent the oil from spilling onto the sea surface due to the lifting of the tubing, the well washout operation is often performed before the workover. Offshore oilfields carry out well washing operations, mainly through diesel oil soaking and geothermal water backwashing. However, diesel oil is only a good organic solvent, and its main function is to soak and clean the organic matter in the formation or wellbore. Moreover, diesel oil takes a long time t...

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Problems solved by technology

However, diesel oil is only a good organic solvent, and its main function is to soak and clean the organic matter in the formation or wellbore. Moreover, diesel oil soaks and washes the well for a long time, and the well washing effect is not good, wasting energy and polluting the environment.

[0003] The thermal washing process technology is different from diesel oil well washing. Although there are non-polluting well washing fluids, the existing well washing fluids have single functions and are not suitable for cleaning heavy and heavy oil. Wells with high wax content and heavy oil wells During the production process, due to the condensation of asphalt colloid and wax, the blockage of tubing, downhole equipment, and organic scale has seriously affected the production of heavy oil.

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