PATENT CLAIM ANALYSIS

Application Number: 16090312
Application Type: Utility
Filing Date: 2018-10
Publication Date: 2019-04
Patent Classification: ["166", "268000"]

Abstract:
Methods for enhanced oil recovery are disclosed. In one method, an oil-bearing sandstone formation having a clay content of at least 5 wt. % is injected with a surfactant mixture, a solution comprising 0.5 to 3 wt. % aqueous alkali, and an aqueous solution comprising a polyether. In another method, a sandstone formation having a salinity within the range of 20,000 to 100,000 ppm total dissolved solids and a divalent ion content within the range of 1,000 to 10,000 ppm is injected with a surfactant mixture and an aqueous solution comprising a polyether. In both methods, the polyether solution is injected as a sacrificial agent prior to injection of the surfactant mixture or is injected as a mitigation agent concurrently with the surfactant mixture. Surprisingly, adsorption of the surfactant mixture onto the formation can be reduced by 20-70% or more compared with a similar methods performed without the aqueous alkali solution, the polyether solution, or both.

Claim (Index 9):
The method of  claim 1  wherein the aqueous solution comprising a polyether comprises a polyether selected from the group consisting of polyethylene glycols having number average molecular weights from 200 to 2,500, polypropylene glycols having number average molecular weights from 200 to 1,000, block copolymers of ethylene oxide and propylene oxide having number average molecular weights from 200 to 2,500, and random copolymers of ethylene oxide and propylene oxide having number average molecular weights from 200 to 2,500.

Metadata:
- Claim Count in Document: 41.0
- Percentile: 97.0
- Lexical Diversity: 2.20513
- Patent Class: 166.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['12909631', '13286901', '11602184', '15365170', '12879231']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7889936366707805
- 35 USC 102 Novelty (BERT): 0.4999304452655297
- Combined Prediction Score: 0.7600873175302554
- Mean Citation Score: 232.160964
- Max Citation Score: 272.90967
- Similarity Product: 180.04723807968017

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 0
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test