Patent · US Active

Fluid loss additive for water based drilling fluids with improved thermal stability

US10501675B2 · kind B2 · utility

0Cited by
3References
7Claims
0Family size

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Key dates

Filing dateDec 17, 2018
Grant dateDec 10, 2019
Priority date—
Expiry dateDec 17, 2038

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC09K8/516
  • WIPO fieldBasic materials chemistry
  • WIPO sectorChemistry

Abstract

A polymer microsphere for use as a fluid loss additive in drilling muds including a hydrophobic core of hydrophobic monomers and a hydrophilic shell of hydrophilic monomers wherein the hydrophilic shell surrounds the hydrophobic core. The polymer microsphere is capable of forming micelles or microgels in water without using surfactants and can be block, graft, and random copolymers. The hydrophilic shell is physically or chemically linked to the hydrophobic core. The polymer microsphere further includes crosslinkers, preferably where the crosslinkers are monomers containing at least two ethylenically unsaturated groups.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.