Efficient multifunctional clay anti-expension stabilizer for injecting water and its production

Abstract

A multifunctional efficient clay anti-swelling stabilizer for injecting water consists of BH-2018 surface activator 70-85 wt%, potassium alginate 5-20 wt%, KOH and NH4Cl 5-15 wt%. The process is carried out by putting BH-2018 surface activator, potassium alginate, KOH and NH4Cl into sealed pressure reactor at normal pressure, starting while agitating, raising temperature to 60-100 degree, reacting for 0.5-20 hrs, cooling to 15-30 degree, adding into NH4Cl, and agitating for 0.5-1 hr. It can be used for various explorations and developments, such as drilling liquid, completing liquid, operation killing, perforating completion and acid process protection.

Description

technical field [0001] The invention relates to a multifunctional high-efficiency clay anti-swelling stabilizer for water injection that can enhance oil recovery and a preparation method thereof. Background technique [0002] At present, in oil water injection production operations, after the channels for transporting oil or the capillary channels for permeating oil in water-sensitive or strongly water-sensitive reservoir oilfields contact with injected water, clay minerals and rock formations will absorb water and swell, which is prone to The migration of fine powder particles blocks the channels, making it impossible for water flooding to drive oil, and oil cannot enter the output wells, resulting in the inability to exploit the oil stored in the formation. Therefore, continuous and effective anti-swelling measures must be taken during the entire process of oilfield development, especially in the water injection development of strongly water-sensitive reservoirs, more atte...

AI Technical Summary

Problems solved by technology

Existing anti-clay swelling or clay stabilizers are mainly small molecule quaternary ammonium salts or polyquaternium cationic surfactants or they are combined with KCl, CaCl 2 or NH 4 Cl and other compounds, although they have a certain anti-swelling and stabilizing effect, these anti-swelling agents have poor anti-scourability and great damage to the formation, and it is easy to cause effective stratification due to water well casing deformation and serious casing damage. The consequences of water injection eventually lead to a series of oilfield development problems such as prominent conflicts between layers