Page 188 - Open-Hole Log Analysis and Formation Evaluation
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a.
       b.
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                                                                   a
              to
                                                                       a
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              find:
                                                                         Figure
                                  fashion
                                         2:
                                                                             =
                                                                                          1:
                                                the
                            equation.
                                                                       variety
                              formation
                                                                   surface
                                                                                                        Establish
                                  as
                  QUESTION
                                                           QUESTION
                                                                 equivalent
                                                         According
                          where
       salinity
                                                                         9.10
                                temperature
          at  180°R.
                        number
                                                                       of
                                                                     annual
                                                         to
                                                                             Tour
                                    resistivity
                teported
                  #9.3
                                                           #9.2
                                              formation
                                                                             +
                                                         the
                on
                                                                         plots
       of  the
                                    of
                                                                metric
                            Sodium
                                                                                     temperatures
                                needs.
                          solution
                                                         log
                                                                     surface
                the
                                         Conversion
                                                                                          Formation
                                                temperature
                              temperature
                                    any
                                                                       assumed
                                       Ry  at  Formation
                                                                case
                                to
                                                                  temperature
                                  temperature
                                                                             depth
                                                                                                        formation
                        of  solutions
                log
                                                                  of
                                be
       solution
                                                                               {   using   culated   temperature   formation   Alternatively,   are   sufficient.   log   Usually   extrapolation.  by   simple   hole   from   estimated  may  be   temperature   Formation   Temperature   Step   R,,  value.  to  an   temperature   2,  at   formation  6.   Convert   R,,.  5.   Compute   from  the  SP.   Ryife/ Rive  tatio  the  4,   Compute   to  an   Ryze  Value,   temperature
                            chloride
                                              temperature
                                                           :
                                    ionic
                                         of Rang
                                                    ,
       in
                                                                      linéar
                              before
                                                                would
                                                         heading,
                                                                         temperature
                                              at
                                                gradient
                              it
                                                                  70°F
                         resistivity  in
                                                in
                                                                be
                                  incteases.
               heading
                                                                        (in
       ppm
                                                                    temperatures.
                              can
                                              9565
               to
                                                                  and
                       of  different
                         Q-m
                                converted
                           ‘solutions
                                      Temperature
                             be
                                                                  a
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                                                                20°C
                                    solution
                                                                                                            equation
                                                                        both
                                                                             ‘temperature
               be
                         is
                                  Thus,
                                                °F/100
       NaCl.
                               to
                                                                                                            is
                                                        bottomhole
                                                                        °F
                                                                      temperature
                                                                and
                                                                    A  good
                                                ft.
               0.08
                             used
                                  2,7
                           behave
                             as
               at
                                 a8
                                                                        and
                                                      temperature
                         plotted
                                                                  gtadient
                                                                            gradient.
                                    decreases
                           as
                                                      of
                                                                    average
                                                                        °C)
                                                                  of
                       concentration
               75°F.
                                    in
                               downhole
                                                                                                           follows:
                                                                      gradients
                                                                1.8°C/100
                         against
                                   a
                                                        temperature
                                                                  1°F
                                                                    case
                                                      70°F
                                                                                       surface
               Use
                           shown
                                 measured
                                                        at
                                                                    is
                                                      is
                                                                m.)
                       (ppm
                                                                      and
                                                                        against
                             a  parameter
                                                        a
                                                                  per
                                 at
                                                                    to
                           in
                             in
                                                                  ft.
                                                                                  be
                             the
                               conditions
                       NaCl).
                                                                        depth
                                                        depth



                         temperature
                           figure
               figure,9.11
                             SP
                                 surface
                               at
                                   predictable
                                                                  (The
                                                      assumed,
                                                                    assume
                                                                        for
                                                                      assumed
                                                        of
                                                                                  cal-
                                                                                       bottom-

                                                                Depth,  Thousands  of  Feet  .   may   data   header   and   50  ole   Surface  Temperature   Annual  Mean   ‘175
                                       Annual  Mean
                                      Surface  Temperature
                 2
                          An
                  2
                                                                                                        75
                                 FIGURE
          where
      formula
                        formula,
          R,
                                 9.10
      as
                 (Ty
          is
                                                                                                        -
                                                                                                          -
        example,-the
                +
                        which
                                                                                                            .       9.  THE  SP  LOG
          the
                7)
                                                                                                        100
                  RED
                          approximation
        data
      follows:
                  |
                                         200
                          to
        of
                        states:
                          the
                                 Temperature  vs.
                                                                                                          Temperature,
                                      Temperature,
          solution
                                      °F
                          chart
        question
                                                                                                        ©  125  150   °C
                                 Depth.
                                         250
                          in
        #9.3
          resistivity

                :
          at
                                 Courtesy
                          figure
        could
                          9.11
                a
        be
                                         300
                          is
          temperature
                                 Schlumberger
                          given.
        applied
                ,
          7,
        to
                          by
                                         350
        the
                          the
          (°F).

                                        {

        Ar
                                                                Depth,  Thousands  of  Meters           175
                                Well  Services,
          For
        s
                          Arps
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