The oil and gas field fracturing flowback fluid project is a project aimed at treating and disposing of the fracturing flowback fluid generated during the development of oil and gas fields. Here is a detailed analysis of the project:
1、 Definition and properties of fracturing flowback fluid
one Definition: Fracturing flowback fluid is a liquid produced during hydraulic fracturing operations in oil and gas fields, which contains a portion of the original fracturing fluid as well as minerals, organic matter, etc. dissolved or carried out in the formation.
two Nature:
High concentration organic matter: Contains fracturing fluid additives such as guar gum, organic boron crosslinker, and breaker, as well as natural organic substances in the formation.
Salt substances and suspended solids: Contains high concentrations of salt substances such as chlorides, sulfates, and suspended solids.
Heavy metal radioactive substances: Very few fracturing flowback fluids contain heavy metals and naturally occurring radioactive substances.
Complex chemical composition: In addition to the organic compounds, salts, and heavy metals mentioned above, it may also contain various chemical additives such as acids, fungicides, drag reducers, thickeners, surfactants, scale inhibitors, etc.
High Chemical Oxygen Demand (COD) and Total Organic Carbon (TOC): The COD and TOC of fracturing flowback fluid are usually high, indicating that it contains a large amount of oxidizable organic matter.
2、 The treatment process of oil and gas field fracturing flowback fluid project
one Traditional processing techniques:
Physical methods mainly include precipitation, filtration, and adsorption, which can effectively remove suspended solids and some chemical substances in the effluent.
Chemical method: By adding chemical agents, harmful substances in the backflow fluid undergo precipitation, oxidation, or reduction reactions to achieve purification.
Biological method: Utilizing the metabolic process of microorganisms to convert organic matter in the reflux fluid into harmless substances.
2. Innovative processing technology:
Plate evaporation crystallization technology: With "evaporation short process technology" as the core, process innovation is carried out to achieve full quantification and resource utilization of oil and gas field wastewater.
CDOF+CDFU technology: integrates the dual advantages of efficient separation and deep purification, providing revolutionary solutions to environmental problems in oil and gas field development. CDOF technology has achieved efficient separation of oil, water, and solid phases in fracturing flowback fluid, with a separation efficiency of over 98%; CDFU technology provides more refined filtration and purification of water bodies that have undergone preliminary CDOF treatment, ensuring that the effluent quality meets strict national and industry standards.
III. Application Cases of Fracturing and Flowback Fluid Projects in Oil and Gas Fields
Taking the Maiyuan Guizhou Zunyi Fracturing and Flowback Fluid Evaporation Short Process Fully Quantified Resource Disposal Project as an example, considering the increasing demand for subsequent flowback fluid treatment, the project is designed with a total treatment capacity of 1000m ³/d, which can directly produce salt and meet the final water discharge standards. This project adopts the "plate evaporation crystallization technology" and "evaporation short process technology" to achieve the full quantification and resource utilization of oil and gas field wastewater, greatly reducing investment and operating costs.
4、 The environmental significance of oil and gas field fracturing flowback fluid projects
one Reducing the risk of environmental pollution: Through scientific and effective treatment methods, the pollution risk of fracturing backflow fluid on water bodies, soil, and ecosystems can be reduced.
two Realize the recycling of water resources: Encourage the reuse of wastewater, and use the treated wastewater for oilfield water injection, agricultural irrigation, etc., to achieve the recycling of water resources.
three Promoting sustainable development: The implementation of oil and gas field fracturing flowback fluid projects helps to promote the sustainable development of the oil and gas extraction industry, in line with the national requirements for environmental protection and energy conservation and emission reduction.
The oil and gas field fracturing flowback fluid project is an important environmental protection project, which is of great significance for protecting the ecological environment, achieving water resource recycling, and promoting sustainable development.
