Petroleum drilling fluid additive and preparation method thereof

Abstract

The invention relates to a petroleum drilling fluid additive and a preparation method thereof. Xanthate and carboxymethyl cellulose are used as initial raw materials to prepare a macro-molecular RAFTreagent, the macro-molecular RAFT reagent is used for emulsion polymerization with alkenyl sulfonic acid, acrylamide and hydroxyethyl acrylate, then 2,3-epoxy propyl trimethyl ammonium chloride or N,N-dimethyl epoxy propyl dodecyl ammonium chloride is added into the emulsion polymerization system to prepare the petroleum drilling fluid additive. The petroleum drilling fluid additive provided by the invention is a cellulose zwitterionic polymer filtrate reducer, cellulose is taken as a core, and a polymer chain is rich in molecular groups such as hydroxyl, carboxyl, acyl amino and sulfo, so that the polymer has relatively strong hydration capability, is insensitive to salt, strong in high temperature resistance, strong in adsorption capability to clay and good in stability; meanwhile, quaternary ammonium salt is used as a shell layer, the core-shell structure improves the adsorption stability of the filtrate reducer in a high-temperature and high-salt environment, and the filtration loss reducing effect, the high temperature resisting effect, and the salt resisting effect are good.

Description

technical field [0001] The invention relates to the field of drilling fluid additives, in particular to a petroleum drilling fluid additive and a preparation method thereof. Background technique [0002] Fluid loss reducer for drilling fluid is one of the main additives in petroleum drilling fluid, it plays an important role in stabilizing drilling fluid and protecting oil and gas layers. During the drilling process, the process of the drilling filtrate seeping into the bottom layer is called filtration loss. In severe cases, it will lead to instability of the well wall, damage to oil and gas layers, and even accidents such as blowout and well collapse. The purpose of adding fluid loss reducer is to form a low-permeability filter cake on the well wall and reduce the fluid loss of drilling fluid as much as possible. [0003] Natural polymer materials such as cellulose, lignin, starch, etc. are usually used as fluid loss control agents in drilling fluids due to their low pric...

AI Technical Summary

Problems solved by technology

However, for increasingly complex mining environments, it is often difficult to achieve high-temperature and salt-resistant effects by directly using such natural polymers or polymers

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