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Collaborating Authors
Results
Effect of Well Interference on Shale Gas Well SRV Interpretation
Pang, Wei (Sinopec Research Institute of Petroleum Engineering) | Ehlig-Economides, Christine A (University of Houston) | Du, Juan (Sinopec Research Institute of Petroleum Engineering) | He, Ying (Sinopec Research Institute of Petroleum Engineering) | Zhang, Tongyi (Sinopec Research Institute of Petroleum Engineering)
Abstract The stimulated reservoir volume (SRV) estimated from daily production rate and pressure is a vital parameter for appraising shale gas wells’ fracturing effect and production potential. However, when well interference occurs, the SRV estimation from rate-normalized pressure (RNP) analysis is compromised. This paper illustrates diagnosis of well interference and how it affects SRV calculation. China is the third country to exploit the shale gas technology breakthrough after the United States and Canada. The Jiaoshiba shale gas play is the most successful shale gas reservoir in China with some wells’ cumulative production over 0.1 billion cubic meters in the first year. Production rate data has shown jumps in water production during hydraulic fracturing of neighboring wells. By combination of hydraulic fracturing process and production data, we detect the existence of well interference from the adjacent well, when well interference happens and the influence it imposed on the target well. We analyzed two pairs of target and neighboring shale gas well pairs using the RNP and its derivative. The log-log diagnostic plots for nearly all of the wells see unit slope, indicating boundary dominated flow within 1 year. Some wells see two unit slopes possibly indicating a change in the SRV after hydraulic fracturing in a neighboring well. Well interference may be caused by interaction between primary hydraulic fractures and/or secondary natural fractures activated during hydraulic fracturing. Interwell interference has had a significant influence on the SRV interpretation. Well interference has drawn people's attention in recent years, but its impact on SRV interpretation is rarely reported. This research may help to characterize shale gas's SRV and related parameters and to optimize well spacing.
- North America > United States (1.00)
- Asia (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > North America Government > United States Government (0.30)
- North America > United States > West Virginia > Appalachian Basin > Marcellus Shale Formation (0.99)
- North America > United States > Virginia > Appalachian Basin > Marcellus Shale Formation (0.99)
- North America > United States > Pennsylvania > Appalachian Basin > Marcellus Shale Formation (0.99)
- (6 more...)
SRV Analysis of Shale Gas Wells in China
Pang, Wei (Sinopec Research Institute of Petroleum Engineering) | He, Zuqing (Sinopec Research Institute of Petroleum Engineering) | Xin, Cuiping (Research Institute of Yanchang Petroleum Company) | Du, Juan (Sinopec Research Institute of Petroleum Engineering) | Sun, Zhiyu (Petroleum Exploration and Production Research Institute of Sinopec)
Abstract China owns the world's largest shale gas reserve and is the third country gaining shale gas breakthrough in the world besides the North America. Fuling in Sichuan basin is the first industrially exploited shale gas play in China. Fuling shale gas wells gain good production performance, and the gas rate of some wells are as high as 0.6 million m during production test period. However, we still haven't get good understanding of SRV, one vital indicator to evaluate the performance of hydraulic fracturing in Fuling shale gas play. Production rate and pressure transient analysis by rate normalized pressure (RNP) and rate normalized pressure derivative (RNP’) method is adopted. The SRV of the pilot wells in Fuling shale gas play is estimated from the boundary dominated flow in the RNP and RNP’ log-log interpretation plot. In order to quantify the influence of parameters on SRV, statistical analyses are conducted on fourteen parameters categorized by three kinds including formation, stimulation, and well parameters. Results show that the parameters are angle between horizontal lateral and minimum stress direction, TOC, absolute open flow (AOF) potential, cumulative gas in first three months, injected fluid volume, porosity, injected fluid volume per stage, fractured clusters, fractured stages, injected proppant volume, flowback recovery in first three months, injected proppant volume per stage, proppant concentration, and horizontal lateral length sorted by the influence on SRV in descending order. The first five parameters have relative strong correlation with SRV. High TOC, porosity and cumulative gas production in early days are good indication of high SRV. Shale gas wells with horizontal lateral paralleled to the minimum stress direction can achieve highest SRV. The other nine parameters, especially proppant concentration and horizontal length show very weak influence on SRV. The negative correlation of proppant concentration on SRV may have been caused by ineffective fractures (networks), and a positive correlation can be achieved by detailed research of geology and engineering "sweet points" and improved hydraulic fracturing techniques to control fracture propagation. The relationship between SRV and flowback recovery may have been disturbed by offset well's interference during hydraulic fracturing and production.
- Asia > China (1.00)
- North America > United States > Texas (0.48)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > North America Government > United States Government (0.30)
- North America > United States > Texas > West Gulf Coast Tertiary Basin > Eagle Ford Shale Formation (0.99)
- North America > United States > Texas > Sabinas - Rio Grande Basin > Eagle Ford Shale Formation (0.99)
- North America > United States > Texas > Maverick Basin > Eagle Ford Shale Formation (0.99)
- Asia > China > Sichuan > Sichuan Basin (0.99)