Petroleum Science >2016,??Issue 3:??532-549 DOI: https://doi.org/10.1007/s12182-016-0112-7
Modeling, analysis, and screening of cyclic pressure pulsingwith nitrogen in hydraulically fractured wells Open?Access
文章信息
作者：Emre Artun,Ali Aghazadeh Khoei and Kutay Ko¨se
作者單位：
1 Petroleum and Natural Gas Engineering Program, Middle East Technical University, Northern Cyprus Campus, Kalkanli, Guzelyurt, 99738 Mersin 10, Turkey;1 Petroleum and Natural Gas Engineering Program, Middle East Technical University, Northern Cyprus Campus, Kalkanli, Guzelyurt, 99738 Mersin 10, Turkey 2 Present Address: University of Tulsa, Tulsa, Oklahoma, USA;1 Petroleum and Natural Gas Engineering Program, Middle East Technical University, Northern Cyprus Campus, Kalkanli, Guzelyurt, 99738 Mersin 10, Turkey
投稿時間：2015-07-16
引用方式：Artun, E., Khoei, A.A. & K?se, K. Pet. Sci. (2016) 13: 532. https://doi.org/10.1007/s12182-016-0112-7
文章摘要
Cyclic pressure pulsing with nitrogen is studied
for hydraulically fractured wells in depleted reservoirs. A
compositional simulation model is constructed to represent
the hydraulic fractures through local-grid refinement. The
process is analyzed from both operational and reservoir/
hydraulic-fracture perspectives. Key sensitivity parameters
for the operational component are chosen as the injection
rate, lengths of injection and soaking periods and the
economic rate limit to shut-in the well. For the reservoir/
hydraulic fracturing components, reservoir permeability,
hydraulic fracture permeability, effective thickness and
half-length are used. These parameters are varied at five
levels. A full-factorial experimental design is utilized to
run 1250 cases. The study shows that within the ranges
studied, the gas-injection process is applied successfully
for a 20-year project period with net present values based
on the incremental recoveries greater than zero. It is
observed that the cycle rate limit, injection and soaking
periods must be optimized to maximize the efficiency. The
simulation results are used to develop a neural network
based proxy model that can be used as a screening tool for
the process. The proxy model is validated with blind-cases
with a correlation coefficient of 0.96.
for hydraulically fractured wells in depleted reservoirs. A
compositional simulation model is constructed to represent
the hydraulic fractures through local-grid refinement. The
process is analyzed from both operational and reservoir/
hydraulic-fracture perspectives. Key sensitivity parameters
for the operational component are chosen as the injection
rate, lengths of injection and soaking periods and the
economic rate limit to shut-in the well. For the reservoir/
hydraulic fracturing components, reservoir permeability,
hydraulic fracture permeability, effective thickness and
half-length are used. These parameters are varied at five
levels. A full-factorial experimental design is utilized to
run 1250 cases. The study shows that within the ranges
studied, the gas-injection process is applied successfully
for a 20-year project period with net present values based
on the incremental recoveries greater than zero. It is
observed that the cycle rate limit, injection and soaking
periods must be optimized to maximize the efficiency. The
simulation results are used to develop a neural network
based proxy model that can be used as a screening tool for
the process. The proxy model is validated with blind-cases
with a correlation coefficient of 0.96.
關鍵詞
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Cyclic pressure pulsing Nitrogen injection Hydraulically-fractured wells Experimental design Artificial neural networks