Transient Coupled Flow Model for Matrix-Fracture in High-Pressure Gas Reservoirs Opened by Gas Drilling
Gas drilling technology is an effective method to protect low permeability tight sandstone reservoirs from damage. However, using this technology to drill high-pressure fractured reservoirs, the fluid flow characteristics are extremely complex, leading to drilling safety challenges. Therefore, based...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Hindawi-Wiley
2023-01-01
|
| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2023/9706407 |
| _version_ | 1797903011431841792 |
|---|---|
| author | Jiajie Liu Gao Li Zhi Ye Wang He Zhihao Zeng |
| author_facet | Jiajie Liu Gao Li Zhi Ye Wang He Zhihao Zeng |
| author_sort | Jiajie Liu |
| collection | DOAJ |
| description | Gas drilling technology is an effective method to protect low permeability tight sandstone reservoirs from damage. However, using this technology to drill high-pressure fractured reservoirs, the fluid flow characteristics are extremely complex, leading to drilling safety challenges. Therefore, based on the conservation equations of mass, momentum, and energy, a new transient coupled flow model in matrix-fracture is established for high-pressure gas reservoirs opened by gas drilling, considering convection term and energy equation, to research the pressure and flow velocity transient behaviors. This model is solved by Shaher Momani’s algorithm and CyabJiBe format, and the type curves of the pressure and flow velocity are plotted. The three flow stages are developed, and the impact of parameters and equation terms on the transient flow behavior is analyzed and discussed, such as the energy equation, the matrix permeability (k), the fracture aperture (Lf), and the fracture outlet pressure. It is found that the energy equation term of the model has a great influence on the transient characteristics such as velocity and pressure, which cannot be ignored. In the first flow stage, the flow velocity characteristics are not affected by the matrix parameters being extremely unstable, but in the second and third stages, the influence of the gas supplied to fracture cannot be ignored. The proposed transient coupled flow model provides a new understanding of the transient flow behavior in matrix-fracture for high-pressure reservoirs during gas drilling, which can be used to interpret the characteristics of pressure and velocity more realistically, to provide support for safe drilling of gas drilling. |
| first_indexed | 2024-04-10T09:26:13Z |
| format | Article |
| id | doaj.art-25d47db545ed4fe782528ee6cbdafa5c |
| institution | Directory Open Access Journal |
| issn | 1468-8123 |
| language | English |
| last_indexed | 2024-04-10T09:26:13Z |
| publishDate | 2023-01-01 |
| publisher | Hindawi-Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj.art-25d47db545ed4fe782528ee6cbdafa5c2023-02-20T01:57:29ZengHindawi-WileyGeofluids1468-81232023-01-01202310.1155/2023/9706407Transient Coupled Flow Model for Matrix-Fracture in High-Pressure Gas Reservoirs Opened by Gas DrillingJiajie Liu0Gao Li1Zhi Ye2Wang He3Zhihao Zeng4College of Chemistry and Chemical EngineeringState Key Laboratory of Oil and Gas Reservoir Geology and ExplorationXi’an Changqing Chemical Group Co.Engineering Technology Management Department of CNPC Changqing Oilfield BranchEngineering Technology Research Institute of PetroChina Southwest Oil & Gasfield CompanyGas drilling technology is an effective method to protect low permeability tight sandstone reservoirs from damage. However, using this technology to drill high-pressure fractured reservoirs, the fluid flow characteristics are extremely complex, leading to drilling safety challenges. Therefore, based on the conservation equations of mass, momentum, and energy, a new transient coupled flow model in matrix-fracture is established for high-pressure gas reservoirs opened by gas drilling, considering convection term and energy equation, to research the pressure and flow velocity transient behaviors. This model is solved by Shaher Momani’s algorithm and CyabJiBe format, and the type curves of the pressure and flow velocity are plotted. The three flow stages are developed, and the impact of parameters and equation terms on the transient flow behavior is analyzed and discussed, such as the energy equation, the matrix permeability (k), the fracture aperture (Lf), and the fracture outlet pressure. It is found that the energy equation term of the model has a great influence on the transient characteristics such as velocity and pressure, which cannot be ignored. In the first flow stage, the flow velocity characteristics are not affected by the matrix parameters being extremely unstable, but in the second and third stages, the influence of the gas supplied to fracture cannot be ignored. The proposed transient coupled flow model provides a new understanding of the transient flow behavior in matrix-fracture for high-pressure reservoirs during gas drilling, which can be used to interpret the characteristics of pressure and velocity more realistically, to provide support for safe drilling of gas drilling.http://dx.doi.org/10.1155/2023/9706407 |
| spellingShingle | Jiajie Liu Gao Li Zhi Ye Wang He Zhihao Zeng Transient Coupled Flow Model for Matrix-Fracture in High-Pressure Gas Reservoirs Opened by Gas Drilling Geofluids |
| title | Transient Coupled Flow Model for Matrix-Fracture in High-Pressure Gas Reservoirs Opened by Gas Drilling |
| title_full | Transient Coupled Flow Model for Matrix-Fracture in High-Pressure Gas Reservoirs Opened by Gas Drilling |
| title_fullStr | Transient Coupled Flow Model for Matrix-Fracture in High-Pressure Gas Reservoirs Opened by Gas Drilling |
| title_full_unstemmed | Transient Coupled Flow Model for Matrix-Fracture in High-Pressure Gas Reservoirs Opened by Gas Drilling |
| title_short | Transient Coupled Flow Model for Matrix-Fracture in High-Pressure Gas Reservoirs Opened by Gas Drilling |
| title_sort | transient coupled flow model for matrix fracture in high pressure gas reservoirs opened by gas drilling |
| url | http://dx.doi.org/10.1155/2023/9706407 |
| work_keys_str_mv | AT jiajieliu transientcoupledflowmodelformatrixfractureinhighpressuregasreservoirsopenedbygasdrilling AT gaoli transientcoupledflowmodelformatrixfractureinhighpressuregasreservoirsopenedbygasdrilling AT zhiye transientcoupledflowmodelformatrixfractureinhighpressuregasreservoirsopenedbygasdrilling AT wanghe transientcoupledflowmodelformatrixfractureinhighpressuregasreservoirsopenedbygasdrilling AT zhihaozeng transientcoupledflowmodelformatrixfractureinhighpressuregasreservoirsopenedbygasdrilling |