Most records in this space claim either a polymer formulation or blend designed to control mobility ratio during injection, or a method for characterising how that polymer behaves in the reservoir, such as measuring inaccessible pore volume or shear degradation. The classification data shows C09K (materials for misc. applications) and E21B (earth and rock drilling) covering the largest shares of records, meaning most claims sit in polymer chemistry and wellbore mechanics rather than in software or sensor systems. A smaller share of filings claim testing methods, such as nuclear magnetic resonance-based pore volume assessment, which sit in G01N and appear in a much smaller portion of the dataset.

The ranking of 100 companies is led by a single assignee with 70 records, well ahead of fifth place at 21 and tenth place at 16, so the field has one clear leader rather than a tight cluster at the top. The top five assignees combined hold 37.8% of all 471 records in scope, and the top ten hold 56.1%, which is a meaningfully concentrated field for a chemistry area this broad. Beyond the leaders, the ranking includes a long tail of companies with far fewer filings each, typical of a mature but still active technical area.

Filing activity is not in a straight decline: 2019 was the peak year so far at 47 records, and the field then went through a quieter period before a sharp step-up from 4 records in 2021 to 17 in 2024, a +325% increase over that span. Because patent publication lags filing by roughly 18 months, the lower-looking figures for 2025 and 2026 in most trend charts are incomplete rather than evidence of a slowdown. Anyone assessing momentum should treat the last one to two years of any such chart as provisional.