Proactive stress interference mechanism and its application in the Mahu oil area, Junggar basin
There exists a large horizontal principal stress difference (11–38 MPa) in the tight conglomerates in the Mahu oil area, China. It is difficult to form a complex fracture network via hydraulic fracturing under these conditions. To improve reservoir stimulation, the fracture formation mechanism of th...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-08-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.948932/full |
| _version_ | 1818172753489952768 |
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| author | Shuo Wang Xiaoshan Li Lihua Hao Xiaogong Zhang Lifeng Zhang Junqiang Song Rongjun Liu Hong Pan Kaifang Gu Ting Li Guanxing Luo Xin Wang Shihong Li |
| author_facet | Shuo Wang Xiaoshan Li Lihua Hao Xiaogong Zhang Lifeng Zhang Junqiang Song Rongjun Liu Hong Pan Kaifang Gu Ting Li Guanxing Luo Xin Wang Shihong Li |
| author_sort | Shuo Wang |
| collection | DOAJ |
| description | There exists a large horizontal principal stress difference (11–38 MPa) in the tight conglomerates in the Mahu oil area, China. It is difficult to form a complex fracture network via hydraulic fracturing under these conditions. To improve reservoir stimulation, the fracture formation mechanism of the complex conglomerate fracture networks was explored. Based on the geomechanics theory of fracture formation, the mechanism of the “stress wall” formed by fracturing in horizontal wells was analyzed in this paper. The inhibitory effect of the stress wall on the formation of tensile and shear fractures was studied. The reason for the decrease in the stress difference coefficient caused by fracturing fluid was analyzed through numerical simulation, which suggested that the complexity of a fracturing network is mainly controlled by the interference of externally applied stress and the reduction in the coefficient of internal stress difference. In this paper, innovative technologies were developed by proactively introducing stress interference in the application of the Ma131 small-well-spacing pilot area. The core technologies include optimization of the 3-D staggered small-well-spacing pattern, and synergetic optimization of multiple elements and zipper fracturing. The positive effects of proactive stress interference on improving fracturing volume, reserve utilization rate and recovery were discussed. Based on the concept of proactive stress interference, the “serial fracturing mode” of horizontal wells was proposed to reduce drilling and fracturing interference and improve the development effect. |
| first_indexed | 2024-12-11T19:17:37Z |
| format | Article |
| id | doaj.art-3922e7d1e7044596810c8b81e6698495 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-12-11T19:17:37Z |
| publishDate | 2022-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-3922e7d1e7044596810c8b81e66984952022-12-22T00:53:37ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-08-011010.3389/feart.2022.948932948932Proactive stress interference mechanism and its application in the Mahu oil area, Junggar basinShuo Wang0Xiaoshan Li1Lihua Hao2Xiaogong Zhang3Lifeng Zhang4Junqiang Song5Rongjun Liu6Hong Pan7Kaifang Gu8Ting Li9Guanxing Luo10Xin Wang11Shihong Li12Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield, Karamay, XJ, ChinaResearch Institute of Exploration and Development, PetroChina Xinjiang Oilfield, Karamay, XJ, ChinaResearch Institute of Engineering Technology, PetroChina Xinjiang Oilfield, Karamay, XJ, ChinaResearch Institute of Exploration and Development, PetroChina Xinjiang Oilfield, Karamay, XJ, ChinaResearch Institute of Exploration and Development, PetroChina Xinjiang Oilfield, Karamay, XJ, ChinaResearch Institute of Exploration and Development, PetroChina Xinjiang Oilfield, Karamay, XJ, ChinaResearch Institute of Exploration and Development, PetroChina Xinjiang Oilfield, Karamay, XJ, ChinaResearch Institute of Exploration and Development, PetroChina Xinjiang Oilfield, Karamay, XJ, ChinaResearch Institute of Exploration and Development, PetroChina Xinjiang Oilfield, Karamay, XJ, ChinaResearch Institute of Exploration and Development, PetroChina Xinjiang Oilfield, Karamay, XJ, ChinaResearch Institute of Exploration and Development, PetroChina Xinjiang Oilfield, Karamay, XJ, ChinaResearch Institute of Exploration and Development, PetroChina Xinjiang Oilfield, Karamay, XJ, ChinaResearch Institute of Exploration and Development, PetroChina Xinjiang Oilfield, Karamay, XJ, ChinaThere exists a large horizontal principal stress difference (11–38 MPa) in the tight conglomerates in the Mahu oil area, China. It is difficult to form a complex fracture network via hydraulic fracturing under these conditions. To improve reservoir stimulation, the fracture formation mechanism of the complex conglomerate fracture networks was explored. Based on the geomechanics theory of fracture formation, the mechanism of the “stress wall” formed by fracturing in horizontal wells was analyzed in this paper. The inhibitory effect of the stress wall on the formation of tensile and shear fractures was studied. The reason for the decrease in the stress difference coefficient caused by fracturing fluid was analyzed through numerical simulation, which suggested that the complexity of a fracturing network is mainly controlled by the interference of externally applied stress and the reduction in the coefficient of internal stress difference. In this paper, innovative technologies were developed by proactively introducing stress interference in the application of the Ma131 small-well-spacing pilot area. The core technologies include optimization of the 3-D staggered small-well-spacing pattern, and synergetic optimization of multiple elements and zipper fracturing. The positive effects of proactive stress interference on improving fracturing volume, reserve utilization rate and recovery were discussed. Based on the concept of proactive stress interference, the “serial fracturing mode” of horizontal wells was proposed to reduce drilling and fracturing interference and improve the development effect.https://www.frontiersin.org/articles/10.3389/feart.2022.948932/fullMahu tight conglomeratestress wallproactive stress interferencecomplex fracture networksequence of fracturing |
| spellingShingle | Shuo Wang Xiaoshan Li Lihua Hao Xiaogong Zhang Lifeng Zhang Junqiang Song Rongjun Liu Hong Pan Kaifang Gu Ting Li Guanxing Luo Xin Wang Shihong Li Proactive stress interference mechanism and its application in the Mahu oil area, Junggar basin Frontiers in Earth Science Mahu tight conglomerate stress wall proactive stress interference complex fracture network sequence of fracturing |
| title | Proactive stress interference mechanism and its application in the Mahu oil area, Junggar basin |
| title_full | Proactive stress interference mechanism and its application in the Mahu oil area, Junggar basin |
| title_fullStr | Proactive stress interference mechanism and its application in the Mahu oil area, Junggar basin |
| title_full_unstemmed | Proactive stress interference mechanism and its application in the Mahu oil area, Junggar basin |
| title_short | Proactive stress interference mechanism and its application in the Mahu oil area, Junggar basin |
| title_sort | proactive stress interference mechanism and its application in the mahu oil area junggar basin |
| topic | Mahu tight conglomerate stress wall proactive stress interference complex fracture network sequence of fracturing |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.948932/full |
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