Modified Leituoshi stone for drilling liquor and its production mehtod

Abstract

The present invention uses calcium base leituoshi stone ore as raw material, and adopts semi-dry artificial modification process including the steps: breaking clay mineral, adding 1%-5% sodium salt, uniformly mixing them, water-spraying, shearing, pressing, piling and ageing for 7-10 days, drying so as to obtain modified leituoshi stone. Said invention is simple in production method, convenient for operation, less in dosage of modifying agent and low in energy consumption and cost. The phi-600 reading value of drilling fluid prepared with modified leituoshi stone is greater than or equal to 60, mud-making rate is greater than or equal to 18 cu.m/t, filter loss is less than or equal to 13.5 ml and dynamic shear force is less than or equal to 1.2XPVPa. It is superior to sodium base bentonite in all the properties, and is applicable for drilling in the fields of petroleum industry, natural gas engineering, geologic drilling engineering and building engineering, etc.

Description

technical field [0001] The invention relates to a modified rectorite for drilling fluid and a production method thereof, in particular to a material used for drilling in industries such as petroleum, natural gas, geological mines, and construction engineering, and belongs to the field of drilling compositions. Background technique [0002] Before the present invention, drilling fluid was mostly prepared with sodium bentonite, and in sodium bentonite, the natural sodium bentonite that can be used for drilling fluid is all seldom at home and abroad; The sodium bentonite of artificial sodium is foreign such as the United States, Britain, Italy , Japan, Brazil and other countries, such as Shandong Gaoyang, Anqiu, Consort Ying, Liaoning Jianping, Hubei Ezhou and other places, all use calcium-based bentonite as the main raw material. For example, in 1985, the Institute of Prospecting Engineering of the Ministry of Geology and Mineral Resources and the Mud Company of the Ministry o...

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Problems solved by technology

For example, in 1985, the Institute of Prospecting Engineering of the Ministry of Geology and Mineral Resources and the Mud Company of the Ministry of Geological and Mineral Resources applied for the patent "Artificial Sodium Soil Process", the application number is 85105253, using calcium-based bentonite as the main raw material, and adopting double-screw extrusion method to realize continuous and mechanized and automated production of artificial sodium bentonite; and the mud company of the Ministry of Geology and Mineral Resources mainly introduced the use of double rollers in the article "Application of Roller Extrusion in the Production of Artificial Sodium Bentonite" in the fourth issue of "Nonmetallic Minerals" in 1992. The extrusion method is to modify calcium-based bentonite to sodium-based bentonite. The disadvantage of the above method is that the wet method with more water is used, the energy consumption required for drying and grinding is high, the equipment cost is high, and the raw materials are all bentonite. After artificial sodium treatment, the overall performance is not ideal; the slurry used in the oilfield or mining area needs to be pre-hydrated for more than 16 hours before it can be used in the well