Multifunctional treating agent for oilfield sewage

Abstract

The invention relates to a multifunctional treating agent for oilfield sewage, which is composed of the following components in parts by weight: 15-25 parts of demulsifier, 10-20 parts of flocculant, 20-25 parts of corrosion inhibitor, 5-10 parts of surfactant and 5-8 parts of bactericide. The treating agent can simultaneously perform the functions of demulsification, flocculation, bridging, foaming, corrosion and scale inhibition, and sterilization. The composite oily sewage treating agent has the advantages of low consumption, high oil removal rate and obvious corrosion and scale inhibition effects, and is especially suitable for treating high-concentration oilfield sewage.

Description

technical field

[0001] The invention relates to a multifunctional treatment agent for oil field sewage, which belongs to the field of water treatment. Background technique

[0002] In oilfields exploited by water injection, most of the water injected into the oil layer from the water injection well returns to the ground through the oil production well, and this part of the water must be removed before the crude oil is transported and exported, and the extracted sewage contains crude oil , so it is called oilfield produced water. With the increase of oilfield exploitation years, the water content of water production fluid has been rising, and some blocks have reached more than 90%. These oily sewage have become the main water injection water source of oilfields. With the continuous development of low-permeability oilfields and off-surface reservoirs around oilfields, the requirements for water quality of oilfield injection are more stringent.

[0003] The composition of dri...