Method for calculating safe drilling fluid density in fractured formation
US11822046B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2023 |
| Grant date | Nov 21, 2023 |
| Priority date | — |
| Expiry date | Mar 7, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2111/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present disclosure discloses a method for calculating a safe drilling fluid density in a fractured formation, including the following steps: S1, performing image processing to identify a downhole fracture; S2, establishing three-dimensional (3D) geological models based on parameters of the downhole fracture, and establishing a drilling wellbore model based on a size and length of a wellbore; S3, assigning the model with material parameters, boundary conditions, and upper and lower bounds of an initial drilling fluid density, and calculating accuracy; S4, solving the 3D geological models using a 3-dimension distinct element code (3DEC) and determining stability of a well wall; S5, determining upper and lower bounds of a drilling fluid density using dichotomy; S6, repeating steps S4 to S5; and S7, after set accuracy conditions are reached, saving and outputting the safe drilling fluid density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.