Method for preparation of lignite resin drilling fluid loss additive

Abstract

The invention provides a preparation method of lignite resin type drilling fluid filtration loss reducing agent, water, lignite, orlon leftovers, polyether polylol, sodium hydroxide, potassium hydroxide, sodium sulfite, sodium bisulfite, laterality sodium sulfite, boric acid, zirconium chloride and formaldehyde are used as materials. The above materials are put into a reactor orderly and are mixed together for reaction; after a series of chemical reactions of alkalization, sulfonation, complexation, graft cross bonding and so on, the lignite resin type drilling fluid filtration loss reducing agent is obtained. When the filtration loss reducing agent provided by the invention is added, the rheology, the unstuousness and the collapse resistance of the drilling fluid can be improved notably. The invention has high temperature resistance, salt resistance, viscidity reducing and collapse preventing performances. The filtration loss reducing agent of the invention has well compatibility with other processing agents in the drilling fluid; can avoid drilling accidents such as that mud wraps the aiguilles and mud cake blocks the drilling machine; and is favorable for stabilizing the well wall and the protecting the oil gas layer.

Description

Technical field [0001] The invention relates to a method for preparing a filtrate reducer for lignite resin drilling fluid. The prepared filtrate reducer is resistant to temperature and salt, has good viscosity reducing effect and anti-collapse performance, and is suitable for preparing fresh water and salt water drilling The liquid system is widely used in deep and medium-deep well drilling. Background technique [0002] Lignite contains 20% to 80% humic acid, and the relative molecular mass of humic acid is 10 2 ~10 6 , Hardly soluble in water, but can react with alkali to produce water-soluble humic acid salt. In the early 1960s, people began to improve the water solubility and salt resistance of humic acid through alkalization, nitrification or sulfonation. The sodium humate and potassium humate produced are temperature-resistant but not salt-tolerant. Inhibit the expansion and dispersion of shale; sodium nitrohumate and sodium sulfomethyl humate have certain temperature and ...

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Problems solved by technology

[0003] U.S. Patent (US 3,956,140) reports polymer fluid loss control agents synthesized by phenol, urea, formaldehyde, sulfite, salicylic acid, benzoic acid and phthalic acid, but the reaction condensation process is difficult to control and the cost is too high and poor temperature resistance, this product has not been widely used in the end

Chinese patent (ZL85106524) reported that using sodium sulfomethyl humate, sulfomethyl phenolic resin and hydrolyzed polyacrylonitrile as raw materials, lignite resin was prepared through a series of processes of lignite extraction, slagging, concentration, sulfonation and grafting Drilling fluid fluid loss reducer, but due to the disadvantages of low raw material utilization rate, high cost, and secondary pollution caused by slag discharge, the production and application of this product is less and less

Chinese patent (ZL99107925.6) has reported the lignite resin fluid loss control agent that is made up of humic acid active intermediate, water-soluble polyacrylonitrile ammonium salt complex polymer and water-soluble carbonamide resin, and this fluid loss control agent has The advantages of temperature resistance and salt resistance, but there are disadvantages such as cumbersome production process and easy foaming in drilling fluid

[0004] So far, it has not been seen that a series of reactions such as alkalization, sulfonation, complexation, grafting and cross-linking have been adopted to comprehensively improve the use of lignite resin fluid loss control agents in drilling fluids by adopting a simple "one-pot stew" production process. The method of comprehensive performance (fluid loss control, rheology, lubricity, anti-slump, etc.)

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