Natural polymer for filtrate loss reducer for drilling fluid and preparation method thereof

Abstract

A natural polymer for a filtrate loss reducer for a drilling fluid and a preparation method thereof are disclosed, the natural polymer is prepared from the following raw materials by weight: 5-15 parts of starch, 2-6 parts of AMPS, 10-15 parts of AM, 0.1-1 part of an initiator, 60-80 parts of water and 0.1-1 part of a deoxidizer. The preparation method comprises the following steps: starch hydrolysis, acidification of a starch solution, deoxidization of a starch acid solution and graft copolymerization of the starch acid solution. The performance of the natural polymer is as follows: 4% saline API filtration loss is equal to or less than 8.0mL, after aging at 150 DEG C, the API filtration loss is equal to or less than 14.0mL, saturated brine API filtration loss is equal to or less than 8.0mL, after aging at 150 DEG C, API filtration loss is equal to or less than 13.0mL, compound brine API filter loss is equal to or less than 13.0mL, after aging at 150 DEG C, API filtration loss is equal to or less than 18.0mL. The natural polymer has good performance, can reduce the filtrate loss of the drilling fluid, avoids or reduces the occurrence of complex drilling accidents, improves drilling quality and efficiency, and produces a good environmental protection effect.

Description

technical field [0001] The invention relates to a fluid loss reducer for drilling fluid, which belongs to petroleum drilling aids, in particular to a natural high molecular weight fluid loss reducer for drilling fluid. The invention also relates to a preparation method of the natural high molecular polymer of the fluid loss control agent for drilling fluid. Background technique [0002] Drilling fluid is an important fluid in drilling engineering, and its performance is directly related to the quality of drilling, and plays a crucial role in the oil recovery efficiency of an oil field. There are various types of fluid loss control agents currently on the market, but they often cannot be both efficient and environmentally friendly. Among the commonly used fluid loss additives for drilling fluids, only starch and modified starch fluid loss additives can meet the requirements of environmental protection, but their performance has certain deficiencies, making it difficult to ef...

AI Technical Summary

Problems solved by technology

[0004] The above technology uses strong alkali (NaOH), which is highly alkaline and easy to cause environmental pollution to the land

The above technologies have not given specific guidance on how to use fluid loss reducers for drilling fluids to fully reduce the fluid loss of drilling fluids, avoid complex drilling accidents, improve drilling quality and efficiency, and have environmental protection functions.

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