Slurry curing agent

Abstract

The invention relates to a slurry curing agent, which is characterized in that the curing agent is formed by mixing the raw materials in percentage by weight: 10 percent to 50 percent of sulphoaluminate compounds, 5 percent to 40 percent of modified starch, 13 percent to 60 percent of fly ash, 1 percent to 10 percent of plaster and 1 percent to 3 percent of exciting agents, wherein 5 percent to 35 percent of curing agents are added according to the water content and the ingredients of slurry, the mixed materials are stirred for 3 to 10 minutes, and the slurry can be cured through being placed for 24 hours to seven days after the flowability loss. The pH value of condensate leaching liquid is 6 to 9, the condensate is similar to the soil, the soil hardening is overcome, the plant root breathing and the moisture evaporation and infiltration can be conveniently realized, the compression strength can meet the second ploughing and oilfield vehicle passing requirements, heavy metal ions in the slurry are encapsulated and fixed in the slurry and can not be free through ion exchange, macromolecular package and adhesion, and the harmless effect is realized.

Description

technical field [0001] The invention relates to a mud curing agent, which belongs to the technical field of petroleum geological drilling pollution prevention and control. Background technique [0002] At present, the waste drilling mud is mainly composed of clay, drilling cuttings, weighting materials, chemical additives, inorganic salts, and oil to form multiple stable suspensions. The pH value is high, and the harmful components that cause environmental pollution are oil, salt, and fungicides. , some chemical additives, heavy metals (such as mercury, copper, chromium, cadmium, zinc and lead, etc.), low molecular organic compounds and alkaline substances produced by the biodegradation of high molecular organic compounds. [0003] The mud curing agent commonly used in China for many years is mainly composed of cement, lime, and fly ash mixture. The pH value of the above curing agent material itself is alkaline, and the waste drilling mud is strongly alkaline. After mixing ...

AI Technical Summary

Problems solved by technology

[0003] The mud curing agent commonly used in China for many years is mainly composed of cement, lime, and fly ash mixture. The pH value of the above curing agent material itself is alkaline, and the waste drilling mud is strongly alkaline. After mixing with the mud, the PH value of the leachate of the solidified product is greater than 9, which exceeds the standard of "Integrated Wastewater Discharge Standard" (GB8978-1996); secondly, the solidified product is too strong, which is equivalent to cement products, making it difficult to re-cultivate the solidified area; Third, the heavy metal ions in the mud cannot be replaced, and they are easily dissociated when soaked in water after solidification. The impact on the environment is mainly manifested in: (1) pollution to surface water and groundwater resources; (2) resulting in compaction of the soil, Mainly due to the influence of salt, crack and rock salt formation, it is unfavorable to plant growth, or even unable to grow, so that the soil cannot be reversed, resulting in waste of soil; (3) Various heavy metals stay in the soil, affecting the growth of plants and the reproduction of microorganisms, At the same time, it is enriched by plant absorption, endangering the health of humans and livestock; (4) the impact on aquatic animals and birds (the impact of chemical additives and certain products of biodegradation on aquatic animals and birds)