A method for treating oil and gas field drilling waste fluid

Abstract

The invention discloses a method for treating waste drilling fluid of an oil and gas field. The method includes the following steps that the pH value of the waste drilling fluid is adjusted to a weak acidity value; the weakly acid waste drilling fluid is subjected to coagulation and oil removing treatment through microwave water treatment equipment; the pH value of the waste drilling fluid subjected to coagulation and oil removing treatment is adjusted to a neutral value; the neutral waste drilling fluid is subjected to sedimentation treatment, and lower-layer sludge and supernatant liquor are obtained. According to the method, the microwave water treatment equipment is used for treating the waste drilling fluid, the treatment efficiency of the waste drilling fluid is greatly improved by means of the microwave hot spot catalytic effect, and it is guaranteed that the waste drilling fluid is well treated under the circumstances that the size of the equipment is small and operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development waste water treatment, and in particular relates to a method for treating oil and gas field drilling waste liquid. Background technique [0002] Drilling and fracturing operations in oil and gas fields will produce a large amount of waste liquid due to various reasons. This kind of waste water has high ss concentration, high chroma, high COD, is difficult to biodegrade, has very complex components, and is very difficult to treat. Drilling waste fluid treatment technology currently mainly adopts the process of flocculation-solid-liquid separation for pretreatment, and mainly uses flocculants (aluminum salt polymers, iron salts, etc.) and coagulants (polyacrylamide, etc.) for flocculation treatment. Press filtration, centrifugation and other means for solid-liquid separation. The pretreatment methods of these drilling waste fluids are relatively mature, but there are obvious s...

AI Technical Summary

Problems solved by technology

[0003] 1) The amount of dosing is difficult to control, and a small experiment is required to determine the amount of dosing;

[0004] 2) The operation is cumbersome, consuming manpower and material resources, and it is difficult to achieve high automation;

[0005] 3) High processing cost;

[0006] 4) The single treatment volume is small, so it is difficult to build a pretreatment system with small volume and large treatment volume

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