METHOD OF NEUTRALISATION OF PRODUCTS OF WELL BOTTOMHOLE ZONE ACID TREATMENT Russian patent published in 2009 - IPC E21B43/27 

FIELD: oil and gas production.

SUBSTANCE: invention refers to oil industry and can be implemented at oil deposit for neutralisation and utilisation of products of well bottomhole zone acid treatment. The essence of the invention is as follows: at neutralisation of products of well bottomhole zone acid treatment a sample for value of fluid pH is taken upon treatment; further required amount of alkaline solution for neutralisation of acid constituents is determined and neutralizing solution is prepared. A dosing installation with a measure tank is installed at the well with piping into a discharge line. Alkaline solution is poured into the measure tank. The well is put into operation simultaneously with start up of the dosing facility. Consumption of fluid from the well and consumption of alkali for neutralisation is determined by correspondence of pH in fluid equal to pH of bed fluid before acid treatment. To evaluate pH of acid treatment products samples of well fluid are taken daily. Operation of the dosing facility is stopped when pH in products of acid treatment is equal to pH of bed fluids.

EFFECT: continuous process of neutralisation of products of well bottomhole zone treatment resulting in reduced shutdowns of well.

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