Scale removing agent and preparation method and application thereof

Abstract

The invention provides a scale removing agent and a preparation method and application thereof. The scale removing agent is prepared from, by weight, 8%-10% of HCl, 1.5%-2% of turning agent, 0.5%-1% of imidazoline quaternary-ammonium-salt corrosion inhibitor, 8%-10% of polyaspartic acid, 5%-10% of sodium fatty alcohol ether sufate and the balance water. The preparation method of the synthesized scale removing agent is simple and easy to implement, the requirement on equipment is low, and on the premise of guaranteeing safe production of an oil field, scale in a three-phase separator and a pipeline can be slowly and completely removed.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field surface engineering, and relates to a scale remover and its preparation method and application. Background technique [0002] At present, the actual operation effect of the three-phase separator in some old oilfield combined stations in China cannot meet the production requirements due to fouling. In addition, related equipment such as valves and flow meters on the water pipeline also increase the probability of failure due to serious fouling, which affects the smooth and safe operation of the three-phase separator. The internal scale of the three-phase separator is serious, which greatly reduces the oil-water separation space, seriously affects the dehydration effect of crude oil, and causes the sewage water quality to exceed the standard. Long-term scaling will suppress the pressure of the internal pipeline, resulting in a series of safety hazards. Pipeline fouling is even more harmfu...

AI Technical Summary

Problems solved by technology

[0002] At present, the actual operation effect of the three-phase separator in some old oilfield combined stations in China cannot meet the production requirements due to fouling

In addition, related equipment such as valves and flow meters on the water pipeline also increase the probability of failure due to serious fouling, which affects the smooth and safe operation of the three-phase separator.

Severe scaling inside the three-phase separator greatly reduces the oil-water separation space, seriously affects the dehydration effect of crude oil, and causes the sewage water quality to exceed the standard. Long-term scaling will suppress the pressure of the internal pipeline, resulting in a series of safety hazards

Pipeline fouling is even more harmful to site safety. Once the fouling is serious and the blockage is caused, the consequences will be disastrous

[0003] At present, scale inhibitors are used to prevent scales from such problems. However, due to the complex composition and properties of the oilfield output fluid and the large liquid volume, the screened scale inhibitors have little effect and cannot completely solve the three-phase problem. Separator and pipeline scaling problems

Due to the complex internal structure of the three-phase separator and the many and complicated pipelines, manual or mechanical descaling methods are used to make the internal descaling incompletely cleaned, and some places cannot even be cleaned.

Only chemical methods can be used to clean the scale, but the addition of large doses of chemicals will cause serious safety problems due to excessive reaction pressure with the scale, and on the other hand, production must be stopped for cleaning, which seriously restricts production.