Polymer/intercalation montmorillonite composite fluid loss reducer and its preparation method and application

Abstract

The invention discloses a polymer / intercalated montmorillonite compound fluid loss agent and a preparation method thereof. The fluid loss agent has a composite structure comprising a polymer supported in the intercalated layer of montmorillonite. A first monomer, a second monomer and a third monomer undergo a polymerization reaction in the presence of an intercalation agent, water, a pH adjuster, an antifoaming agent, a molecular weight regulator, an anti-metal ion interference agent and an initiator to form a polymer supported in the intercalated layer. The first monomer is 2-acrylamido-2-methylpropanesulfonic acid, the second monomer is N, N-dimethylacrylamide, and the third monomer is maleic anhydride. The method comprises adding the montmorillonite and intercalation agent into water, stirring to mix the materials, adding other raw materials without an initiator into the mixture, carrying out stirring and heating, adding an initiator into the mixture and carrying out a polymerization reaction process. The fluid loss agent has strong calcium and magnesium ion pollution resistance and water loss performances and is particularly suitable for marine drilling and cementing.

Description

Technical field [0001] This application relates to but not limited to the field of cementing oil and gas wells, and specifically relates to but not limited to a polymer / intercalation montmorillonite composite fluid loss reducer and its preparation method and application. Background technique [0002] In the process of drilling and cementing, it is very important to control the water loss performance of cement slurry. If the amount of water loss is too large, it will not only make the performance of the cement slurry worse, affect the quality of drilling, cementing or cementing construction, but also cause a certain degree of damage to the reservoir. Therefore, the water loss of the slurry must be controlled as required. The usual method of controlling water loss is to add a fluid loss agent. There are many materials used as fluid loss agents in oilfields. At present, synthetic fluid loss agents are commonly used, which are generally produced by copolymerization of two or more mo...

AI Technical Summary

Problems solved by technology

Polymer cement fluid loss reducers are mostly prepared by solution polymerization, and most of the prepared fluid loss reducers cannot resist the interference of calcium and magnesium ions

If the well cementing construction is carried out on the offshore drilling platform, the cement slurry prepared with sea water will cause the cement slurry to thicken and cannot be used for construction

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