Preparation technology of bentonite for oil-based drilling fluid

Abstract

The present invention relates to a preparation process of bentonite for oil-based drilling fluid, comprising the following steps: step S1: rough selection of raw material bentonite, crushing to a certain particle size for later use; step S2: pulping, the raw material bentonite of step S1, Add a certain amount of water and a pulping auxiliary to make a slurry, and the pulping auxiliary is composed of sodium lignosulfonate and amino trihydric alcohol; step S3: artificial sodium, adding a certain amount to the slurry in step S2 A certain amount of sodium salt, sodiumization reaction for a period of time; step S4: purification; step S5: organic activation, adding a certain amount of organic ammonium salt and activation aid, activation reaction for a certain period of time, the activation aid is 1-ethyl-(3 A mixture of dimethylaminopropyl) carbodiimide hydrochloride and tungstophosphoric acid PW12; step S6: filtering, drying, pulverizing and sieving to obtain bentonite for oil-based drilling fluid. Greatly improve the dispersibility of montmorillonite, improve the effect of sodium, and then improve the organicization, greatly improving the performance of organic bentonite.

Description

technical field [0001] The invention relates to a preparation process of bentonite for oil-based drilling fluid, and belongs to the technical field of bentonite modification and processing. Background technique [0002] Organic bentonite is a new field of fine chemicals developed in recent years. It is widely used in special markets and is an indispensable additive in industries such as paints, coatings, petroleum, cosmetics, and catalyst carriers. Used as an anti-sedimentation additive in paints, it can prevent pigments from sinking and agglomerating. It can be used as a flow rate control agent in emulsions. It can be used in oil drilling. It can be used as an additive for oil-based mud to increase the consistency of mud and improve Mud dispersibility and suspension. [0003] Publication No. 104031623A, a Chinese invention patent published on September 10, 2014, discloses a kind of organic bentonite for white oil-based drilling fluid and its preparation method, which impro...

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Problems solved by technology

[0004] It still has the following deficiencies: montmorillonite is composed of multi-layer stacked wafers. Due to the unbalanced charge, the bottom of the crystal layer has a negative charge and the end face is positively charged, thus forming a card-room structure in which the end face is adsorbed in the aqueous medium. , the so-called card room structure, that is, the montmorillonite wafer is suspended in the slurry in the form of tens or even thousands of clusters. Under this structure, it is not conducive to the formation of sodium ions, hydrogen ions and the montmorillonite in the center of the clusters. The internal exchangeable ions are fully exchanged, which affects the fullness of organicization and then affects the final performance of the product

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