Cleaning agent for heat cleaning of wellhole and preparation method thereof

A cleaning agent and hot cleaning technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of downhole equipment blockage, poor cleaning effect, waste of energy, etc., and achieve superior use effect and perfect compatibility performance , the effect of preventing re-adsorption
CN102899009BInactive Publication Date: 2014-06-25CNOOC ENERGY TECH & SERVICES +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CNOOC ENERGY TECH & SERVICES
Publication Date
2014-06-25
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Claims

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