US 9,845,421 B1 · Encapsulating agent and preparing method thereof, and drilling fluid for petroleum drilling

Abstract

The present invention relates to the technical field of petroleum drilling, specifically provides an encapsulating agent and preparing method thereof, and a drilling fluid, wherein the encapsulating agent comprises an acrylamide monomer structure unit represented by formula (I), an anti-temperature monomer structure unit represented by formula (II) and an cation monomer structure unit represented by formula (III); wherein R1 and R2 are each independently H, and linear or branched alkyl of C1-C15, and R3 is H or the linear or branched alkyl of C1-C5. The drilling fluid provided in the present invention has strong inhibition property and stable rheological property.

Claims18

Dependent claims

An encapsulating agent, comprising an acrylamide monomer structure unit represented by formula (I), an anti-temperature monomer structure unit represented by formula (II) and a cation monomer structure unit represented by formula (III);

wherein a number-average molecular weight of the encapsulating agent is 200,000-400,000;
and a cationic degree is 1.1-1.25 mmol/g;
wherein R1 is decyl, undecyl or dodecyl, R2 is H or methyl, and R3 is H or the linear or branched C1-C5 alkyl.

Dependencies are inferred from the claim text.

Encapsulating agent and preparing method thereof, and drilling fluid for petroleum drilling

Life of this patent

Encapsulating agent and preparing method thereof, and drilling fluid for petroleum drilling

Life of this patent

Abstract

Claims18