Well cementation working solution prepared from red mud, slag and waste drilling fluids

Abstract

The invention discloses a well cementation working solution prepared from red mud, slag and waste drilling fluids. The working solution is prepared from components in parts by weight as follows: 100 parts of waste drilling fluids, 50-100 parts of slag, 5-50 parts of red mud, 4-7 parts of a suspension stabilizer, 1-7 parts of an activating aid, 0.5-5 parts of an anti-pollution agent and 0.4-3.5 parts of a diluent. The waste drilling fluids are waste waterborne drilling fluids, the slag is blast furnace slag or vanadium-titanium slag, the suspension stabilizer is sodium bentonite, carboxymethylcellulose or a mixture of sodium bentonite and carboxymethyl cellulose, the activating aid is sodium metasilicate nonahydrate, sodium carbonate or a mixture of sodium metasilicate nonahydrate and sodium carbonate, the anti-pollution agent is sodium salicylate, potassium citrate or a mixture of sodium salicylate and potassium citrate, and the diluent is sodium lignin sulfonate. The principle is reliable, the cost is low, recycling of multiple industrial wastes is realized, resources are saved, the environment is protected, the preparation technology is simple, the working solution is convenientto use on site and particularly applicable to cementation of oil and gas wells in low-abundance, low-pressure and easy-to-leak blocks, and good technical support can be provided for development of oil and gas resources of the blocks.

Description

technical field [0001] The invention relates to a well cementing working fluid prepared by using industrial waste (red mud, slag and waste drilling fluid), which belongs to the field of industrial waste recycling and is especially suitable for oil and gas well cementing operations. Background technique [0002] As an intermediate product in the process of extracting alumina in the aluminum industry, red mud has the characteristics of high alkalinity and high pollution. In industrial production, on average, 1-2 tons of red mud is produced for every ton of alumina produced. Due to the difficulty in recycling red mud, it can only be piled up. As the fourth largest producer of alumina in the world, China has accumulated more than 250 million tons of red mud (2013 data), occupying a large amount of land resources and causing serious pollution to groundwater and air. In addition, the total storage capacity of slag in my country has exceeded 400 million tons, covering an area of ...

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Problems solved by technology

[0004] Through the investigation, it is found that the current red mud recovery technology is mostly aimed at reducing the pollution of red mud or extracting iron from it. The industrial production process of these technologies is relatively complicated, and the treatment agents used are often harmful to the environment (such as concentrated sulfuric acid, Sodium hydroxide), and the utilization rate of red mud is low, the consumption of red mud is small, and the complete recycling of red mud cannot be realized

At the same time, people also have similar problems in the utilization of slag. The current mainstream treatment method uses slag to prepare slag cement, which consumes a relatively limited amount of slag, and fails to solve the environmental pollution caused by large-scale stacking of slag.

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