A new post-frac evaluation method for shale gas wells based on fracturing curves
Post-fracturing evaluation by using limited data is of great significance to continuous improvement of the fracturing programs. In this paper, a fracturing curve was divided into two stages (i.e., prepad fluid injection and main fracturing) so as to further understand the parameters of reservoirs an...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2016-03-01
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| Series: | Natural Gas Industry B |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352854016300286 |
| _version_ | 1797288607741902848 |
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| author | Xiaobing Bian Tingxue Jiang Changgui Jia Haitao Wang Shuangming Li Yuan Su Ran Wei |
| author_facet | Xiaobing Bian Tingxue Jiang Changgui Jia Haitao Wang Shuangming Li Yuan Su Ran Wei |
| author_sort | Xiaobing Bian |
| collection | DOAJ |
| description | Post-fracturing evaluation by using limited data is of great significance to continuous improvement of the fracturing programs. In this paper, a fracturing curve was divided into two stages (i.e., prepad fluid injection and main fracturing) so as to further understand the parameters of reservoirs and artificial fractures. The brittleness and plasticity of formations were qualitatively identified by use of the statistics of formation fracture frequency, and average pressure dropping range and rate during the prepad fluid injection. The composite brittleness index was quantitatively calculated by using the energy zones in the process of fracturing. It is shown from the large-scale true triaxial physical simulation results that the complexity of fractures is reflected by the pressure fluctuation frequency and amplitude in the main fracturing curve, and combined with the brittleness and plasticity of formations, the fracture morphology far away from the well can be diagnosed. Well P, a shale gas well in SE Chongqing, was taken as an example for post-fracturing evaluation. It is shown that the shale beds are of stronger heterogeneity along the extension directions of horizontal wells, and with GR 260 API as the dividing line between brittleness and plasticity in this area, complex fracture systems tend to form in brittleness-prone formations. In Well P, half of the fractures are single fractures, so it is necessary to carry out fine subsection and turnaround fracturing so as to improve development effects. This paper provides a theoretical basis for improving the fracturing well design and increasing the effective stimulated volume in this area. |
| first_indexed | 2024-03-07T18:51:53Z |
| format | Article |
| id | doaj.art-fbe77b3838bb4af8bbfbc4d8780b51c3 |
| institution | Directory Open Access Journal |
| issn | 2352-8540 |
| language | English |
| last_indexed | 2024-03-07T18:51:53Z |
| publishDate | 2016-03-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Natural Gas Industry B |
| spelling | doaj.art-fbe77b3838bb4af8bbfbc4d8780b51c32024-03-02T01:34:32ZengKeAi Communications Co., Ltd.Natural Gas Industry B2352-85402016-03-013214615110.1016/j.ngib.2016.03.010A new post-frac evaluation method for shale gas wells based on fracturing curvesXiaobing Bian0Tingxue Jiang1Changgui Jia2Haitao Wang3Shuangming Li4Yuan Su5Ran Wei6Sinopec Research Institute of Petroleum Engineering, Beijing 100101, ChinaSinopec Research Institute of Petroleum Engineering, Beijing 100101, ChinaSinopec Research Institute of Petroleum Engineering, Beijing 100101, ChinaSinopec Research Institute of Petroleum Engineering, Beijing 100101, ChinaSinopec Research Institute of Petroleum Engineering, Beijing 100101, ChinaSinopec Research Institute of Petroleum Engineering, Beijing 100101, ChinaSinopec Research Institute of Petroleum Engineering, Beijing 100101, ChinaPost-fracturing evaluation by using limited data is of great significance to continuous improvement of the fracturing programs. In this paper, a fracturing curve was divided into two stages (i.e., prepad fluid injection and main fracturing) so as to further understand the parameters of reservoirs and artificial fractures. The brittleness and plasticity of formations were qualitatively identified by use of the statistics of formation fracture frequency, and average pressure dropping range and rate during the prepad fluid injection. The composite brittleness index was quantitatively calculated by using the energy zones in the process of fracturing. It is shown from the large-scale true triaxial physical simulation results that the complexity of fractures is reflected by the pressure fluctuation frequency and amplitude in the main fracturing curve, and combined with the brittleness and plasticity of formations, the fracture morphology far away from the well can be diagnosed. Well P, a shale gas well in SE Chongqing, was taken as an example for post-fracturing evaluation. It is shown that the shale beds are of stronger heterogeneity along the extension directions of horizontal wells, and with GR 260 API as the dividing line between brittleness and plasticity in this area, complex fracture systems tend to form in brittleness-prone formations. In Well P, half of the fractures are single fractures, so it is necessary to carry out fine subsection and turnaround fracturing so as to improve development effects. This paper provides a theoretical basis for improving the fracturing well design and increasing the effective stimulated volume in this area.http://www.sciencedirect.com/science/article/pii/S2352854016300286Shale gas wellPost-frac evaluationPrepad fluid injectionMain fracturingBrittlenessFracture complexityQuantitative evaluationSE Chongqing |
| spellingShingle | Xiaobing Bian Tingxue Jiang Changgui Jia Haitao Wang Shuangming Li Yuan Su Ran Wei A new post-frac evaluation method for shale gas wells based on fracturing curves Natural Gas Industry B Shale gas well Post-frac evaluation Prepad fluid injection Main fracturing Brittleness Fracture complexity Quantitative evaluation SE Chongqing |
| title | A new post-frac evaluation method for shale gas wells based on fracturing curves |
| title_full | A new post-frac evaluation method for shale gas wells based on fracturing curves |
| title_fullStr | A new post-frac evaluation method for shale gas wells based on fracturing curves |
| title_full_unstemmed | A new post-frac evaluation method for shale gas wells based on fracturing curves |
| title_short | A new post-frac evaluation method for shale gas wells based on fracturing curves |
| title_sort | new post frac evaluation method for shale gas wells based on fracturing curves |
| topic | Shale gas well Post-frac evaluation Prepad fluid injection Main fracturing Brittleness Fracture complexity Quantitative evaluation SE Chongqing |
| url | http://www.sciencedirect.com/science/article/pii/S2352854016300286 |
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