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3000111
LECTURE 21
Descrição
lecture 21- Well Logging
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lecture 21
petroleum
well logging
mindmap
semester
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Hoa Truong
, atualizado more than 1 year ago
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Hoa Truong
quase 9 anos atrás
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Resumo de Recurso
LECTURE 21
WELL LOGGING
Conventional Logs
Spontaneous potential (SP)
Measures natural electric potential, porosity, well correlation
Resistivity (LLD and LLS)
measure: electric resistivity, deep+shallow logs (flushed zone vs. virgin zone), pemeability, pore fluid type
Gamma-ray (GR)
measure: decay of natural radioisotopes, lithology, grain size, well correlation
Sonics (DT)
Measure: slowness of rock, lithology, porosity
Caliper (CAL)
Measure: borehole diameter, washouts, mudcake, stress-induced failure
Neutron (NPHI)
measure: hydrogen atoms (water content), lithology, porosity
Density (RHOB)
measure: electron density, bulk rock density, lithology, porosity
Dipmeter
measure: orientation of dipping surfaces, structural+ stratigraphic analysis
Measurement/logging while drilling (MWD/LWD)
log measurement detector can also be mounted in the drill colars behind bit
Pros: real-time logging while drilling, minimise invasion effects, safer, easier, possible in horizontal/deviated well
Cons: some not as high quality as wireline logging
Measurement of physical properties of rocks+fluids vs. depth in a well
many logs to identify rock types, porosity, oil/water filled
wireline logging
housed in pipe (protection), several assemble tools, cable for power+send data back
data records as tool move up+down holeat maintain speed to measure depth (200-2000m/hr)
Logging truck
mounted with cable, winch, depth measurement + computerise record + processing equipment
reading: measured property/volume (dimension of volume control: resolution, radius of investigation)
Specialist Logs
High resolution electrical + acoustic logs
pseudo-images of borehole walls
high resolution image of borehole: sedimentary structure, fractures, irregularities
Small-scale structural + stratigraphic analysis
Stress-induced failure of borehole (collapse)
Drilling-induced fractures (fluid loss)
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