PATENT CLAIM ANALYSIS

Application Number: 16249089
Application Type: Utility
Filing Date: 2019-01
Publication Date: 2019-05
Patent Classification: ["166", "363000"]

Abstract:
A dual gradient drilling system includes a subsea blowout preventer disposed above a wellhead, the subsea blowout preventer having a central lumen configured to provide access to a wellbore, a lower section of a marine riser fluidly connected to the subsea blowout preventer, a closed-hydraulic positive displacement subsea pump system fluidly connected to the lower section of the marine riser and disposed at a predetermined depth, an annular sealing system disposed above the closed-hydraulic positive displacement subsea pump system, and an independent mud return line fluidly connecting one or more pump heads of the closed-hydraulic positive displacement subsea pump system to a choke manifold disposed on a floating platform of a rig.

Claim (Index 23):
A method of dual gradient drilling comprising:\n sealing an annulus surrounding a drill string; pumping drilling fluids down the drill string; using a closed-hydraulic positive displacement subsea pump system to pump returning fluids toward a rig; and controlling inlet pressure of one or more subsea pumps by managing an amount of mass stored in a marine riser and a wellbore disposed below the closed-hydraulic positive displacement subsea pump system without venting hydraulic drive fluid, wherein the amount of mass stored is managed by adjusting a pump speed of the closed-hydraulic positive displacement subsea pump system until a target pressure set point is achieved and then setting the pump speed to match an injection rate into the wellbore such that mass out is approximately equal to mass being injected into the wellbore.

Metadata:
- Claim Count in Document: 4.0
- Percentile: 99.0
- Lexical Diversity: 2.07018
- Patent Class: 166.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['16249186', '16249135', '14170666', '12936254', '15258504']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8482341303602366
- 35 USC 102 Novelty (BERT): 0.6266356916816053
- Combined Prediction Score: 0.8260742864923735
- Mean Citation Score: 498.339424
- Max Citation Score: 680.5001
- Similarity Product: 548.9225953416346

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

Dataset: test