Page 141 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2

Water produced and well died.
Weigh of water and a little

m
No kumation psnnaabtlW. SmaN
Recovered very littla mud
with vary lh fomlaHGll fluid.
Resolution of gas In ddllpip munt of mud may be recovered Low fonneUon petmaabii.
and some lonnatii nuid.
when well is shut-h at surface.
Tealisprobeblynormal maw
respects.
Effect of skh. Reewered forma- Flow on choke from highly
Uon fluids. The amount recwerad, pennaable fonnalkn. The
pessure Increase during fkw, rate of surface and subsurface fiow-
bU1ld-W dewds UP pimeabili. the ing pressures and now rate
pregsUreS and differentials. mpre~e- depend upon transmissibility.
of flu&, volumes affected, formation pressure. pressure
Gradual plugging of fbw stream and degree of damagn from solid and differentials. choke size and
bakw gauge. hsure declines filtrate invasion, perforations, partial many other characteristics of
88 flow rate decmases to a value penetration of the formation. etc. A the formath nuids. and the
equal to weight of fluids above large skin can raducs fbw substantially flow system. Build-up during flow
gsuge.Recovemdalittlemudand and vary large pressure differentials and shut-in is very rapld and
small amount of mseryolr fluids. Can result from skins. mliable values for skin and
penneabiiily may not be obtainable.
Figure 5-63. Continued.