The pilot appraisal of acid fracturing of coalbed methane reservoir in southeast Qinshui Basin, China
The reserves of Coalbed Methane (CBM) in Qinshui Basin are quite promising, but the outputs from CBM wells are quite small even after massive hydraulic fracturing. Herein the fracture system with #3 and #15 coal seams in Qinshui basin was analyzed, and it was found that both of the macro-scale fract...
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| Format: | Article |
| Language: | English |
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Universidad Nacional de Colombia
2016-10-01
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| Series: | Earth Sciences Research Journal |
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| Online Access: | https://revistas.unal.edu.co/index.php/esrj/article/view/61633 |
| _version_ | 1818475072364478464 |
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| author | Yu Yang Chengwei Zhang Huijun Tian Wangang Chen Xiadong Peng Hao Zhang |
| author_facet | Yu Yang Chengwei Zhang Huijun Tian Wangang Chen Xiadong Peng Hao Zhang |
| author_sort | Yu Yang |
| collection | DOAJ |
| description | The reserves of Coalbed Methane (CBM) in Qinshui Basin are quite promising, but the outputs from CBM wells are quite small even after massive hydraulic fracturing. Herein the fracture system with #3 and #15 coal seams in Qinshui basin was analyzed, and it was found that both of the macro-scale fractures and micro-scale fractures are filled with clay and carbonate minerals, which explains the low productivity of CBM wells after conventional hydraulic fracturing. Acid fracturing has long been an effective method for carbonate gas reservoir to improve the gas well production. However, there were few reports about the application of acid fracturing in coal bed methane field. Based on the mineral identification and acid sensitivity test, the feasibility of acid fracturing demonstrated that the acid does more help than damage to increase the permeability of coal seams in Qinshui basin. Onsite operations have shown that acid fracturing is applicable for the CBM wells in Jincheng Mining Area. It was also observed from the microseismic survey that when applying the acid fracturing treatment, the stimulated reservoir area depends on the acid volume pumped in the first stage, which is crucial to the success of the stimulation.
Evaluación piloto de fractura ácida en depósitos de gas metano de carbón en el suroeste de la cuenca Qinshui, China
Resumen
Las reservas de gas metano de carbón (CBM, del inglés Coalbed Methane) en la cuenca Qinshui son más que prometedoras, pero la producción en los pozos es muy pequeña, incluso después de fracturas hidráulicas masivas. En este trabajo se analizaron los sistemas de fractura de las vetas de carbón #3 y #15 de la cuenca Qinshui y se encontró que tanto las fracturas a macroescala como aquellas a microescala están cubiertas con arcillas y minerales carbonatos, lo que explica la baja productividad de los pozos de gas metano de carbón después de la fractura hidráulica convencional. La fractura ácida ha sido un método efectivo en los depósitos de gas carbonato para mejorar la producción en el pozo de gas. Sin embargo, existen pocos informes sobre la aplicación de la fractura ácida en el campo del gas metano de carbón. De acuerdo con la identificación mineral y las pruebas de sensibilidad ácida, la factibilidad de la fractura ácida demostró que el ácido es reparador en el incremento de la permeabilidad en las vetas de carbón de la cuenca Qinshui. Las operaciones in situ han demostrado que la fractura ácida es aplicable para los pozos de gas metano de carbón en el área minera de Jincheng. También se observó en el sondeo microsísmico que cuando se aplica un tratamiento de fractura ácida, el área del depósito estimulada depende del volumen de ácido bombeado en primera instancia, lo que es determinante en el éxito de la estimulación. |
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| publishDate | 2016-10-01 |
| publisher | Universidad Nacional de Colombia |
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| series | Earth Sciences Research Journal |
| spelling | doaj.art-c2cd3530745844a597a051bf51c282592022-12-22T02:11:28ZengUniversidad Nacional de ColombiaEarth Sciences Research Journal1794-61902339-34592016-10-0120410.15446/esrj.v20n4.6163344762The pilot appraisal of acid fracturing of coalbed methane reservoir in southeast Qinshui Basin, ChinaYu YangChengwei ZhangHuijun TianWangang ChenXiadong PengHao ZhangThe reserves of Coalbed Methane (CBM) in Qinshui Basin are quite promising, but the outputs from CBM wells are quite small even after massive hydraulic fracturing. Herein the fracture system with #3 and #15 coal seams in Qinshui basin was analyzed, and it was found that both of the macro-scale fractures and micro-scale fractures are filled with clay and carbonate minerals, which explains the low productivity of CBM wells after conventional hydraulic fracturing. Acid fracturing has long been an effective method for carbonate gas reservoir to improve the gas well production. However, there were few reports about the application of acid fracturing in coal bed methane field. Based on the mineral identification and acid sensitivity test, the feasibility of acid fracturing demonstrated that the acid does more help than damage to increase the permeability of coal seams in Qinshui basin. Onsite operations have shown that acid fracturing is applicable for the CBM wells in Jincheng Mining Area. It was also observed from the microseismic survey that when applying the acid fracturing treatment, the stimulated reservoir area depends on the acid volume pumped in the first stage, which is crucial to the success of the stimulation. Evaluación piloto de fractura ácida en depósitos de gas metano de carbón en el suroeste de la cuenca Qinshui, China Resumen Las reservas de gas metano de carbón (CBM, del inglés Coalbed Methane) en la cuenca Qinshui son más que prometedoras, pero la producción en los pozos es muy pequeña, incluso después de fracturas hidráulicas masivas. En este trabajo se analizaron los sistemas de fractura de las vetas de carbón #3 y #15 de la cuenca Qinshui y se encontró que tanto las fracturas a macroescala como aquellas a microescala están cubiertas con arcillas y minerales carbonatos, lo que explica la baja productividad de los pozos de gas metano de carbón después de la fractura hidráulica convencional. La fractura ácida ha sido un método efectivo en los depósitos de gas carbonato para mejorar la producción en el pozo de gas. Sin embargo, existen pocos informes sobre la aplicación de la fractura ácida en el campo del gas metano de carbón. De acuerdo con la identificación mineral y las pruebas de sensibilidad ácida, la factibilidad de la fractura ácida demostró que el ácido es reparador en el incremento de la permeabilidad en las vetas de carbón de la cuenca Qinshui. Las operaciones in situ han demostrado que la fractura ácida es aplicable para los pozos de gas metano de carbón en el área minera de Jincheng. También se observó en el sondeo microsísmico que cuando se aplica un tratamiento de fractura ácida, el área del depósito estimulada depende del volumen de ácido bombeado en primera instancia, lo que es determinante en el éxito de la estimulación.https://revistas.unal.edu.co/index.php/esrj/article/view/61633Coalbed MethaneAcid FracturingAcid Sensitivity TestStimulated Reservoir AreaGas metano de carbónfractura ácidapruebas de sensibilidad ácidaárea del reservorio estimulada. |
| spellingShingle | Yu Yang Chengwei Zhang Huijun Tian Wangang Chen Xiadong Peng Hao Zhang The pilot appraisal of acid fracturing of coalbed methane reservoir in southeast Qinshui Basin, China Earth Sciences Research Journal Coalbed Methane Acid Fracturing Acid Sensitivity Test Stimulated Reservoir Area Gas metano de carbón fractura ácida pruebas de sensibilidad ácida área del reservorio estimulada. |
| title | The pilot appraisal of acid fracturing of coalbed methane reservoir in southeast Qinshui Basin, China |
| title_full | The pilot appraisal of acid fracturing of coalbed methane reservoir in southeast Qinshui Basin, China |
| title_fullStr | The pilot appraisal of acid fracturing of coalbed methane reservoir in southeast Qinshui Basin, China |
| title_full_unstemmed | The pilot appraisal of acid fracturing of coalbed methane reservoir in southeast Qinshui Basin, China |
| title_short | The pilot appraisal of acid fracturing of coalbed methane reservoir in southeast Qinshui Basin, China |
| title_sort | pilot appraisal of acid fracturing of coalbed methane reservoir in southeast qinshui basin china |
| topic | Coalbed Methane Acid Fracturing Acid Sensitivity Test Stimulated Reservoir Area Gas metano de carbón fractura ácida pruebas de sensibilidad ácida área del reservorio estimulada. |
| url | https://revistas.unal.edu.co/index.php/esrj/article/view/61633 |
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