Gas-Water Flow Behavior in Water-Bearing Tight Gas Reservoirs
Some tight sandstone gas reservoirs contain mobile water, and the mobile water generally has a significant impact on the gas flowing in tight pores. The flow behavior of gas and water in tight pores is different than in conventional formations, yet there is a lack of adequate models to predict the g...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2017-01-01
|
| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2017/9745795 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832563838734565376 |
|---|---|
| author | Renyi Cao Liyou Ye Qihong Lei Xinhua Chen Y. Zee Ma Xiao Huang |
| author_facet | Renyi Cao Liyou Ye Qihong Lei Xinhua Chen Y. Zee Ma Xiao Huang |
| author_sort | Renyi Cao |
| collection | DOAJ |
| description | Some tight sandstone gas reservoirs contain mobile water, and the mobile water generally has a significant impact on the gas flowing in tight pores. The flow behavior of gas and water in tight pores is different than in conventional formations, yet there is a lack of adequate models to predict the gas production and describe the gas-water flow behaviors in water-bearing tight gas reservoirs. Based on the experimental results, this paper presents mathematical models to describe flow behaviors of gas and water in tight gas formations; the threshold pressure gradient, stress sensitivity, and relative permeability are all considered in our models. A numerical simulator using these models has been developed to improve the flow simulation accuracy for water-bearing tight gas reservoirs. The results show that the effect of stress sensitivity becomes larger as water saturation increases, leading to a fast decline of gas production; in addition, the nonlinear flow of gas phase is aggravated with the increase of water saturation and the decrease of permeability. The gas recovery decreases when the threshold pressure gradient (TPG) and stress sensitivity are taken into account. Therefore, a reasonable drawdown pressure should be set to minimize the damage of nonlinear factors to gas recovery. |
| format | Article |
| id | doaj-art-40263fdd1c2f4ce38aa2cbae6ee0513d |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-40263fdd1c2f4ce38aa2cbae6ee0513d2025-02-03T01:12:24ZengWileyGeofluids1468-81151468-81232017-01-01201710.1155/2017/97457959745795Gas-Water Flow Behavior in Water-Bearing Tight Gas ReservoirsRenyi Cao0Liyou Ye1Qihong Lei2Xinhua Chen3Y. Zee Ma4Xiao Huang5School of Petroleum Engineering, China University of Petroleum, Beijing 102249, ChinaDepartment of Porous Flow & Fluid Mechanics, PetroChina RIPED, Langfang 065007, ChinaResearch Institute of Exploration and Development, Changqing Oil Field, PetroChina, Shaanxi 710021, ChinaSchool of Petroleum Engineering, China University of Petroleum, Beijing 102249, ChinaSchlumberger, Denver, CO 80202, USASchool of Petroleum Engineering, China University of Petroleum, Beijing 102249, ChinaSome tight sandstone gas reservoirs contain mobile water, and the mobile water generally has a significant impact on the gas flowing in tight pores. The flow behavior of gas and water in tight pores is different than in conventional formations, yet there is a lack of adequate models to predict the gas production and describe the gas-water flow behaviors in water-bearing tight gas reservoirs. Based on the experimental results, this paper presents mathematical models to describe flow behaviors of gas and water in tight gas formations; the threshold pressure gradient, stress sensitivity, and relative permeability are all considered in our models. A numerical simulator using these models has been developed to improve the flow simulation accuracy for water-bearing tight gas reservoirs. The results show that the effect of stress sensitivity becomes larger as water saturation increases, leading to a fast decline of gas production; in addition, the nonlinear flow of gas phase is aggravated with the increase of water saturation and the decrease of permeability. The gas recovery decreases when the threshold pressure gradient (TPG) and stress sensitivity are taken into account. Therefore, a reasonable drawdown pressure should be set to minimize the damage of nonlinear factors to gas recovery.http://dx.doi.org/10.1155/2017/9745795 |
| spellingShingle | Renyi Cao Liyou Ye Qihong Lei Xinhua Chen Y. Zee Ma Xiao Huang Gas-Water Flow Behavior in Water-Bearing Tight Gas Reservoirs Geofluids |
| title | Gas-Water Flow Behavior in Water-Bearing Tight Gas Reservoirs |
| title_full | Gas-Water Flow Behavior in Water-Bearing Tight Gas Reservoirs |
| title_fullStr | Gas-Water Flow Behavior in Water-Bearing Tight Gas Reservoirs |
| title_full_unstemmed | Gas-Water Flow Behavior in Water-Bearing Tight Gas Reservoirs |
| title_short | Gas-Water Flow Behavior in Water-Bearing Tight Gas Reservoirs |
| title_sort | gas water flow behavior in water bearing tight gas reservoirs |
| url | http://dx.doi.org/10.1155/2017/9745795 |
| work_keys_str_mv | AT renyicao gaswaterflowbehaviorinwaterbearingtightgasreservoirs AT liyouye gaswaterflowbehaviorinwaterbearingtightgasreservoirs AT qihonglei gaswaterflowbehaviorinwaterbearingtightgasreservoirs AT xinhuachen gaswaterflowbehaviorinwaterbearingtightgasreservoirs AT yzeema gaswaterflowbehaviorinwaterbearingtightgasreservoirs AT xiaohuang gaswaterflowbehaviorinwaterbearingtightgasreservoirs |