LECTURE 21

Hoa Truong
Mind Map by Hoa Truong, updated more than 1 year ago
Hoa Truong
Created by Hoa Truong about 6 years ago
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lecture 21- Well Logging

Resource summary

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