Page 263 - Well Control for Completions and Interventions
P. 263

Well Kill, Kick Detection, and Well Shut-In                  257


                                     Reverse circulation: Kill chart.
                   2500
                                                           Tubing head pressure
                                                           Casing pressure
                   2000




                  Pressure (psi)  1500



                   1000



                    500



                      0
                       0               218              426             644
              Figure 7.2 Plot of casing and tubing pressure (Example 1).
              Table 7.4 Reverse circulation kill data
              Top reservoir depth                         10,500 ft.
              Current reservoir pressure                  5570 psi
              Original reservoir pressure                 6750 psi
              Plug depth                                  10,350 ft.
              Packer depth                                10,330 ft.
              Sliding sleeve or sliding side door (SSD) depth  10,300 ft.
               1
              5/2 in. tubing ID                           4.670 in.
               5
              9/8 in. casing ID                           8.535 in.
              SITP                                        1900 psi
              SICP                                        0 psi (before sleeve open)
              Packer fluid gradient                       0.67 psi/ft. (12.88 ppg)
              Oil gradient                                0.35 psi/ft. (6.73 ppg)
              Planned overbalance                         200 psi


              original reservoir pressure. In all other respects, the well is identical to the
              previous example (Table 7.4).
                 Since the tubing head pressure, oil density values, and reservoir pres-
              sure are identical to those used in the first example, it follows that the kill
              fluid requirement (0.5564 psi/ft.) is also the same. Tubing and annulus
              volumes are also unchanged. However, having a heavier fluid present in
   258   259   260   261   262   263   264   265   266   267   268