Device for collecting oil slick from drilling fluid in offshore drilling

Abstract

The invention relates to a device for collecting oil slick from drilling fluid in offshore drilling. The device comprises a drilling fluid pipeline, a centrifuge, a sedimentation tank, a connector, a connecting pipeline, a diaphragm pump, an oil-water separator, an oil catch tank and a drilling fluid storage tank. The inlet of the sedimentation tank is connected with the outlet of the drilling fluid centrifuge; the upper part of the sedimentation tank is connected with the connector; the outlet of the sedimentation tank is connected with the drilling fluid pipeline; the inlet of the diaphragm pump is connected with the connecting pipeline; the connector is installed at the tail end of the connecting pipeline; the connector is placed in the upper part of the sedimentation tank; the outlet of the diaphragm pump is connected with the oil-water separator through the connecting pipeline. The device has a simple structure, the on-site layout is convenient, coalescence media net in the oil-water separator can be reused after being removed and cleaned, the oil slick recovery device does not incur any expenses in use, except for the one-time invested purchasing expenses of the diaphragm pump, the connecting pipeline and the oil-water separator, and economic benefits can be achieved by the recovered oil.

Description

technical field [0001] The invention relates to the technical field of environmental protection for offshore oil exploration and development in the petroleum industry, in particular to a floating oil collection device in offshore drilling fluid. Background technique [0002] At present, the marine ecological environment, like the terrestrial ecological environment, is an important part of the ecological environment. In 1982, China's State Environmental Protection Agency and the State Oceanic Administration successively promulgated laws and regulations such as the "Marine Environmental Protection Law of the People's Republic of China", "Offshore Oil Exploration Environmental Protection Law" and other laws and regulations. The regulations on the discharge of offshore drilling waste are quite strict, especially oily The impact of drilling / completion fluid waste on the environment has aroused the general concern of environmental protection circles, petroleum industry circles and...

AI Technical Summary

Problems solved by technology

These drilling fluids better meet the needs of offshore drilling projects, but they also bring environmental pollution problems to the marine environment after use. The main manifestations are: (1) Oily waste drilling fluids are discharged into the sea, and oil will be extracted from waste drilling fluids. separated from the water, floating on the sea surface to form a sea oil slick

Oil slicks on the sea surface will cause a series of harm to the marine environment: oil floating on the sea water surface forms an oil film, which affects the exchange between sea water and the atmosphere, reduces dissolved oxygen in sea water, and causes huge losses of marine organisms or marine fisheries; the oil film drifts with the sea breeze, It often drifts to the bay and tourist scenic spots, affecting the color and smell of sea water, thereby affecting coastal fishery, tourism, industrial and agricultural production and domestic water, causing huge economic losses or adverse social impacts; oil and its decomposition products , there are a variety of toxic substances. These substances are absorbed and enriched by aquatic organisms in seawater, and then enter the human body through the food chain, endangering human health; large-scale marine oil slicks will also affect atmospheric circulation and endanger marine ecosystems. cause unpredictable long-term environmental effects

(2) The oil that has not been separated from the waste drilling fluid will sink into the seabed together with the waste drilling fluid. Under the condition of insufficient oxygen supply on the seabed, the biodegradation of the oil is very slow and will remain on the seabed for a long time

In addition, the oil in the abandoned drilling fluid that sinks to the seabed will be gradually released, affecting the growth and reproduction of marine organisms, or forming an oil slick on the sea surface, causing various hazards

[0003] At present, the general solid-liquid separation and oil recovery efficiency is low, and it will also damage the stability and performance of drilling fluid, and the solid-liquid separation equipment is large in size, which is not suitable for offshore drilling platforms; the cyclone solid-liquid separator is large in size and solid The performance of the drilling fluid will be damaged during liquid separation, and further oil-water separation is required; the technical principle of chemical oil removal methods such as oil dispersants is to emulsify the oil slick with the water phase in the drilling fluid to form a uniform emulsion, and the slick oil temporarily "Disappearing" and hiding will easily cause secondary pollution to the marine environment, and oil slicks will not be recycled

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