Method for calculating daily gas production rate of methane hydrate deposit based on inflow performance relationship formulas
US10816531B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 2020 |
| Grant date | Oct 27, 2020 |
| Priority date | — |
| Expiry date | May 27, 2040 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/0875
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A daily gas production rate of a methane hydrate deposit is calculated based on inflow performance relationship formulas. Step 1 determines the production stage, including the gas production rate trend of a production test and selecting an inflow performance relationship formula corresponding to the stage. Step 2 calculates basic coefficient terms related to energy conversion in the inflow performance relationship formula. Step 3 obtains other coefficient terms related to production in the inflow performance relationship formula. Step 4 predicts the gas production rate under other production pressure differences. Staged inflow performance relationship formulas characterize the complex methane hydrate deposit production performance. Gas production rate and deposit pressure under a large pressure differences are predicted through simple production tests under a small pressure difference, providing a basis for production design of the hydrate deposit and preventing accidents that may be caused by direct production under a large pressure difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.