Laboratory analysis of liquid injection method on hydraulic fracturing initiation and propagation in deep shale formation
Compared with the middle-shallow shale gas reservoirs, deep shale formation often reveals lower fracture complexity, smaller effective stimulated volumes, lower conductivity, and faster declined when the same injection model and technical parameters were used. Therefore, it is necessary to research...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
KeAi Communications Co., Ltd.
2019-12-01
|
| Series: | Natural Gas Industry B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352854019301196 |
| _version_ | 1797284400819339264 |
|---|---|
| author | Xin Chang |
| author_facet | Xin Chang |
| author_sort | Xin Chang |
| collection | DOAJ |
| description | Compared with the middle-shallow shale gas reservoirs, deep shale formation often reveals lower fracture complexity, smaller effective stimulated volumes, lower conductivity, and faster declined when the same injection model and technical parameters were used. Therefore, it is necessary to research a special injection model for the deep shale formation. In this paper, a series of laboratory stimulated experiments were carried to analyze the injection method on hydraulic fracturing initiation and propagation in the deep shale formation. The outcrop shale of Longmaxi formation in Sichuan Basin was selected and three different injection methods (constant, stepped-rise and cyclic progressive uplift pump rate) were used in these experiments. The test results showed that the stepped-rise pump rate is conductive to opening the pre-existing natural fracture and bedding planes, the fracture complexity of this injection method is the highest. Meanwhile, the fracturing pressure and total injection volume are the lowest. In contrast, the cyclic-uplift injection method can only form a transverse fracture, and the fracturing pressure is the highest. The research results have an important theoretical guiding value for deep shale hydraulic fracturing operation. Keywords: Deep shale gas, Injection method, Hydraulic fracturing, Crack initiation and propagation, Laboratory experiments |
| first_indexed | 2024-03-07T17:48:27Z |
| format | Article |
| id | doaj.art-fef73ff5889746f09801e0d1bd0a7657 |
| institution | Directory Open Access Journal |
| issn | 2352-8540 |
| language | English |
| last_indexed | 2024-03-07T17:48:27Z |
| publishDate | 2019-12-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Natural Gas Industry B |
| spelling | doaj.art-fef73ff5889746f09801e0d1bd0a76572024-03-02T14:38:29ZengKeAi Communications Co., Ltd.Natural Gas Industry B2352-85402019-12-0166652658Laboratory analysis of liquid injection method on hydraulic fracturing initiation and propagation in deep shale formationXin Chang0State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; University of Chinese Academy of Sciences, Beijing, 100049, ChinaCompared with the middle-shallow shale gas reservoirs, deep shale formation often reveals lower fracture complexity, smaller effective stimulated volumes, lower conductivity, and faster declined when the same injection model and technical parameters were used. Therefore, it is necessary to research a special injection model for the deep shale formation. In this paper, a series of laboratory stimulated experiments were carried to analyze the injection method on hydraulic fracturing initiation and propagation in the deep shale formation. The outcrop shale of Longmaxi formation in Sichuan Basin was selected and three different injection methods (constant, stepped-rise and cyclic progressive uplift pump rate) were used in these experiments. The test results showed that the stepped-rise pump rate is conductive to opening the pre-existing natural fracture and bedding planes, the fracture complexity of this injection method is the highest. Meanwhile, the fracturing pressure and total injection volume are the lowest. In contrast, the cyclic-uplift injection method can only form a transverse fracture, and the fracturing pressure is the highest. The research results have an important theoretical guiding value for deep shale hydraulic fracturing operation. Keywords: Deep shale gas, Injection method, Hydraulic fracturing, Crack initiation and propagation, Laboratory experimentshttp://www.sciencedirect.com/science/article/pii/S2352854019301196 |
| spellingShingle | Xin Chang Laboratory analysis of liquid injection method on hydraulic fracturing initiation and propagation in deep shale formation Natural Gas Industry B |
| title | Laboratory analysis of liquid injection method on hydraulic fracturing initiation and propagation in deep shale formation |
| title_full | Laboratory analysis of liquid injection method on hydraulic fracturing initiation and propagation in deep shale formation |
| title_fullStr | Laboratory analysis of liquid injection method on hydraulic fracturing initiation and propagation in deep shale formation |
| title_full_unstemmed | Laboratory analysis of liquid injection method on hydraulic fracturing initiation and propagation in deep shale formation |
| title_short | Laboratory analysis of liquid injection method on hydraulic fracturing initiation and propagation in deep shale formation |
| title_sort | laboratory analysis of liquid injection method on hydraulic fracturing initiation and propagation in deep shale formation |
| url | http://www.sciencedirect.com/science/article/pii/S2352854019301196 |
| work_keys_str_mv | AT xinchang laboratoryanalysisofliquidinjectionmethodonhydraulicfracturinginitiationandpropagationindeepshaleformation |