Changes

==Maximum rates==

==Maximum rates==

Maximum rates of separate phase migration are estimated to be much faster than commonly envisioned. Many old fields, particularly gas fields, have produced more hydrocarbons than their original estimates of reserves in place. Initial production rates often decline to a low steady-state value. Discounting the uncertainties involved in these estimates, it appears production may decline until it is balanced by the area integrated charge rate of the field. Many shut-in wells show pressure buildup, indicating transfer of fluids into the field at relatively rapid rates. It is, however, uncertain what portion of the recharge is hydrocarbons and what portion is water.

Maximum rates of separate phase migration are estimated to be much faster than commonly envisioned. Many old fields, particularly gas fields, have produced more hydrocarbons than their original estimates of reserves in place. Initial production rates often decline to a low steady-state value. Discounting the uncertainties involved in these estimates, it appears production may decline until it is balanced by the area integrated [[Calculating charge volume|charge]] rate of the field. Many shut-in wells show pressure buildup, indicating transfer of fluids into the field at relatively rapid rates. It is, however, uncertain what portion of the recharge is hydrocarbons and what portion is water.

==See also==

==See also==