Oilfield drilling wastewater purifying and reusing treatment system and technology

Abstract

The invention relates to an oilfield drilling wastewater purifying and reusing treatment system and technology. The treatment system comprises a water inlet pipe, a coagulation filter, a gravity sedimentation chamber, an activated carbon filter and a water outlet pipe which are sequentially connected, wherein the water inlet pipe is provided with an expansion mixing section; a first dosing port and a second dosing port which are sequentially arranged are formed in the portion, in front of the expansion mixing section, of the water inlet pipe; the coagulation filter comprises a coagulation chamber communicated with the water inlet pipe, a filter screen and a water collection chamber communicated with the gravity sedimentation chamber, the water collection chamber is arranged outside the coagulation chamber, and the filter screen is located between the coagulation chamber and the water collection chamber; a connecting water pipe communicating the water collection chamber with the gravity sedimentation chamber is sequentially provided with a check valve and a third dosing port; the gravity sedimentation chamber is directly communicated with an inlet of the activated carbon filter, and an outlet of the activated carbon filter is communicated with the water outlet pipe. The chemical purifying process of drilling wastewater comprises the steps of efficient coagulation, disinfection and hydrogen sulfide removal, and the reusing treatment process comprises the steps of chemical deoxygenization, metal ion reduction and pipeline corrosion prevention. According to the treatment system, the structure is simple, the cost is low, the treatment technology is simple and convenient to operate, the technological steps are reasonable, integral treatment on the drilling wastewater is achieved, and the purified water can be directly drained and can be used as oilfield reinjection water after being conditioned.

Description

technical field [0001] The invention relates to the technical field of waste water treatment and utilization, in particular to an oil field drilling waste water purification and reuse treatment system and process. Background technique [0002] In the process of oil field development and production, a large amount of drilling wastewater will be produced. Drilling wastewater is the sewage generated during the drilling process. The main sources of drilling wastewater include the following categories: mud waste, cuttings and sewage generated during tripping operations, sewage generated from flushing ground drilling equipment and operating tools, and cooling water used for power equipment. The impurities and properties in drilling wastewater are closely related to the composition of drilling mud and the properties of rock formations. That is, different oil and gas fields, different drilling areas, different well depths, and different mud materials have different properties of the...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an oilfield drilling wastewater purification and reuse treatment system and process in order to solve the above-mentioned problems in the existing drilling wastewater treatment process, such as polluted environment, high treatment cost and inability to be reused.

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