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 1):
A method for preparing a surfactant that changes the wettability of tight sandstone, wherein it comprising the following steps:\n 1) mixing 1 to 3 parts by weight of emulsifier with 30 to 40 parts by weight of solvent oil to prepare an oil phase solvent, adding 5 to 8 parts by weight of modified lignosulphonate monomer into the oil phase solvent to prepare an oil phase mixed solution; 2) adding 15 to 25 parts by weight of hydrophilic cationic monomer and 7 to 10 parts by weight of non-ionic monomer into 50 to 60 parts by weight of water, stirring and dissolving, adjusting the pH value to 8.5 to 9.5 to obtain an aqueous phase solution; 3) adding the aqueous phase solution into the oil phase mixed solution, and then adding 0.10 to 0.15 parts by weight of an initiator therein to cause a polymerization to obtain a high polymer; wherein the mass ratio of the aqueous phase solution to the oil phase mixed solution is 1:(2 to 2.5); 4) mixing 32 to 56 parts by weight of fluorocarbon surfactant and 15 to 23 parts by weight of biosurfactant to obtain a surfactant system; 5) adding 40 to 55 parts by weight of the surfactant system into 30 to 43 parts by weight of the high polymer, and stirring the mixture uniformly to obtain the surfactant that changes the wettability of tight sandstone.

Metadata:
- Claim Count in Document: 1.0
- Percentile: 91.0
- Lexical Diversity: 1.85366
- Patent Class: 166.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['14306706', '15590643', '14944150', '14089280', '14228152']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7730010980547704
- 35 USC 102 Novelty (BERT): 0.4703223010536135
- Combined Prediction Score: 0.7427332183546548
- Mean Citation Score: 195.64517
- Max Citation Score: 209.14276
- Similarity Product: 160.50211821953295

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