Coal slag metakaolin-based decontaminating and stabilizing material for water-based drilling cuttings as well as decontaminating and stabilizing method thereof

Abstract

The invention discloses a coal slag metakaolin-based decontaminating and stabilizing material for water-based drilling cuttings as well as a decontaminating and stabilizing method thereof, and belongsto the technical field of an environmentally-friendly decontaminating and stabilizing material. The coal slag metakaolin-based decontaminating and stabilizing material for water-based drilling cuttings consists of the following components in percentage by mass: 25.0 to 45.0 percent of coal slag, 11 to 30 percent of metakaolin, 15 to 25 percent of cement, 6 to 13 percent of quick lime, 3 to 5 percent of crosslinking agent and 1 to 2 percent of mineral particle stabilizer. Various materials such as coal slag, the metakaolin and the cement as well as the water-based drilling cuttings are mixed for treating the water-based drilling cuttings , so that generation of percolate by the water-based drilling cuttings or waste coal slag under the erosion and soaking effects can be avoided; the coal slag metakaolin-based decontaminating and stabilizing material for the water-based drilling cuttings is suitable for a subbase layer, an under layer and backfill in the field of road construction, notonly can completely utilize industrial solid waste slag, but also can perform resource utilization on the stabilized drilling waste, namely the water-based drilling cuttings, is applied to road subbase layer, under layer and backfill, and accords with national environmental protection and resource policies.

Description

technical field [0001] The invention belongs to the technical field of environment-friendly decontamination and stabilization materials, and in particular relates to a cinder metakaolin-based decontamination and stabilization material for water-based drilling cuttings and a decontamination and stabilization method. Background technique [0002] Water-based drilling cuttings are rock / mineral particles that are ground or broken by the drill bit during drilling in oil and gas fields. They are brought out of the ground by the circulating flushing fluid from the well, and contain a mixture of cuttings such as clay, weighting materials, and various treatment agents, mainly including Small gravel, clay, shale and sand, etc. In addition, a small amount of drilling fluid will adhere to the surface of the drill cuttings discharged. Its main components are SiO2, Al2O3, Fe2O3, CaO, etc., which are similar to the chemical composition of clay. Mineral-based. According to calculations and...

AI Technical Summary

Problems solved by technology

Such a large amount of water-based drilling cuttings is produced and accumulated year by year. If it is not utilized, it will pose a potential threat to the environment. However, corresponding to the increase in water-based drilling cuttings year by year, there is little progress in its resource utilization. Major sources of pollution in mining industries

[0003] At present, the main disposal methods of water-based drilling cuttings are: solidified landfill, construction material utilization and land utilization. No matter which treatment method is used, due to the occupation of a large amount of land area and the incomplete decomposition of pollutants, with the extension of time, the long-term rainfall caused Erosion and immersion, etc., may seep out leachate that will pollute the surrounding soil and water.

[0004] At the same time, in recent years, the disposal and recycling of industrial solid waste in environmental pollution problems has become the biggest focus of public attention, especially in the fields of coal chemical industry and coal-to-methanol, where a large amount of waste cinders are inevitably produced. It is considerable, and the accumulated amount of stockpiling over the years is large. Its placement and stockpiling not only waste land resources, but also pollute the environment, especially the various coal cinders accumulated in the open-air slag yard. , Human production poses a huge threat

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