4 --G. 'more welle penetrete tha deeper hori--ABSTRACT One problem confronting! reeervoir engiaeers tcday la an analyeie of the L.-.--. reeervoir mocnanammm iii~~l?=d iil :h= depletion of abnormally hish preeeure reeervolre.Two mechanleme that have baen propoeed ara (1) hitth rock compreeaibility and (2) shale water influx. This paper la a study of the qhale water i"nflux theory. A litqrature search waa conducted to qetablieh what ie known qbout shala . ...--. .L. ,.--permeaox~azy, c0xIpres8aoLAALY, poroeity, and water viacoeity.The qhale properties were used in a calculation of water influx for two qctual auperpresaure reaervoira ualns a linear diffusivity equation in which permeability and compressibility were a function of praaeure. of the shale parametare , permeability qnd compreeeibility have the moat influence on water influx. For an initial shale permeability of tha ordar of 10-5 md and an Initial bulk compreeeibllity of 40 x 10-' pal-i , ehale watar infl~m eiSnificantly affacts the reservoir depletion.For shale permeabilftiea of tha order of 10-7 ad, ehale water influx ie insignificant.1: wae alao noted tnat the preaaure dietrlbution in the ah~le ia very steep and only the first few feet of shale contribute materially to the water influx. An approximate method for extrapolating qarly plz behavior in 9uPerPreaeure Sae reservoirs ia aleo preeented.
4 --G. 'more welle penetrete tha deeper hori--ABSTRACT One problem confronting! reeervoir engiaeers tcday la an analyeie of the L.-.--. reeervoir mocnanammm iii~~l?=d iil :h= depletion of abnormally hish preeeure reeervolre.Two mechanleme that have baen propoeed ara (1) hitth rock compreeaibility and (2) shale water influx. This paper la a study of the qhale water i"nflux theory. A litqrature search waa conducted to qetablieh what ie known qbout shala . ...--. .L. ,.--permeaox~azy, c0xIpres8aoLAALY, poroeity, and water viacoeity.The qhale properties were used in a calculation of water influx for two qctual auperpresaure reaervoira ualns a linear diffusivity equation in which permeability and compressibility were a function of praaeure. of the shale parametare , permeability qnd compreeeibility have the moat influence on water influx. For an initial shale permeability of tha ordar of 10-5 md and an Initial bulk compreeeibllity of 40 x 10-' pal-i , ehale watar infl~m eiSnificantly affacts the reservoir depletion.For shale permeabilftiea of tha order of 10-7 ad, ehale water influx ie insignificant.1: wae alao noted tnat the preaaure dietrlbution in the ah~le ia very steep and only the first few feet of shale contribute materially to the water influx. An approximate method for extrapolating qarly plz behavior in 9uPerPreaeure Sae reservoirs ia aleo preeented.
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