PATENT CLAIM ANALYSIS

Application Number: 15956617
Application Type: Utility
Filing Date: 2018-04
Publication Date: 2019-01
Patent Classification: ["166", "270100"]

Abstract:
A surfactant that changes the wettability of tight sandstone and its preparation method and application. By adding the aqueous phase solution into the oil phase solution, and under the action of the emulsifier, a uniformly dispersed phase is achieved. Then adding initiator, stirring and raising the temperature, reacting the reaction at the temperature to obtain a colorless and transparent liquid, i.e., high polymer. At room temperature, adding fluorocarbon surfactant and biosurfactant and stirring was continued for 4 hours to obtain a surfactant that changes the surface wettability of tight sandstone. The surfactant of the present invention can reduce the oil-water interfacial tension, transform the oil-wet surface into water-wet surface, which reduces the adhesion of oil droplets to rock surface and improves the flowability of crude oil in the original stratum, and improves the recovery of low-permeability reservoir.

Claim (Index 20):
The use according to  claim 15 , wherein the fluorocarbon surfactant is one or more of ethyldimethylammonium 3-polyepoxyhexafluoropropaneamidopropyl (2-sulfite), sodium perfluoropropylalkylsulfonate, perfluoroalkyl carboxylic acid amide alkyl carboxylic acid sodium, perfluorooctane sulfonic acid tetraethylamine amide; the biosurfactant is one or more of sophorolipid, rhamnolipid, trehalose lipid.

Metadata:
- Claim Count in Document: 1.0
- Percentile: 91.0
- Lexical Diversity: 1.85366
- Patent Class: 166.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['14306706', '15590643', '14944150', '14089280', '14228152']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7918502368799033
- 35 USC 102 Novelty (BERT): 0.4808016804120102
- Combined Prediction Score: 0.760745381233114
- Mean Citation Score: 195.64517
- Max Citation Score: 209.14276
- Similarity Product: 146.92871966702938

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

Dataset: test