PATENT CLAIM ANALYSIS

Application Number: 16075848
Application Type: Utility
Filing Date: 2018-08
Publication Date: 2019-01
Patent Classification: ["385", "012000"]

Abstract:
A method is described for compensating measurement errors of fiber Bragg grating (FBG) sensors installed in fiber cables in downhole oil and gas environments due to hydrogen darkening. The method involves loading a fiber of known length and multiple FBG sensors in a hydrogen chamber with control of temperature, hydrogen concentration, pressure, and time and adjusting each of the variables through a test matrix while continuously measuring and recording the fiber transmission loss and FBG spectrum changes, then creating a correlation map of fiber transmission loss vs. Bragg wavelength shift, and using that map for compensating the wavelength shift of downhole installed fiber cables as a function of their hydrogen induced transmission loss through time.

Claim (Index 6):
A method comprising:\n loading a test fiber cable having a test grating sensor in a hydrogen chamber having a temperature, hydrogen concentration, and a pressure; performing the following operations while the test fiber cable is in the hydrogen chamber, transmitting a light along the test fiber cable;\n detecting the light by the test grating sensor; and \n measuring, based on the detected light, a fiber transmission loss and a grating spectrum change of the light transmitted along the test fiber cable; \n correlating the fiber transmission loss with at least one of a wavelength and a wavelength shift of the light during the transmission; positioning an installed fiber cable down a borehole, the installed fiber cable having an installed grating sensor; transmitting a light along the installed fiber cable; detecting the light by the installed grating sensor of the installed fiber cable; and measuring, based on the detected light, a hydrogen induced transmission loss of installed fiber cable; and compensating a wavelength shift of the installed grating sensor based on the correlating and the hydrogen induced transmission loss.

Metadata:
- Claim Count in Document: 28.0
- Percentile: 96.0
- Lexical Diversity: 1.72222
- Patent Class: 385.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['13181502', '16033911', '12004233', '15693556', '11181798']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7823408203076806
- 35 USC 102 Novelty (BERT): 0.5042788932048395
- Combined Prediction Score: 0.7545346275973964
- Mean Citation Score: 220.741212
- Max Citation Score: 237.05994
- Similarity Product: 162.03951018738627

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

Dataset: test