code: def _add_ts2q(self, pore, queue):
          
          net = self.project.network
          elem_type = 'throat'
          # Find throats connected to newly invaded pore
          Ts = net.find_neighbor_throats(pores=pore)
          # Remove already invaded throats from Ts
          Ts = Ts[self['throat.invasion_sequence'][Ts] <= 0]
          tcp = self['throat.entry_pressure']
          if len(Ts) > 0:
              self._interface_Ts[Ts] = True
              for T in Ts:
                  data = []
                  # Pc
                  if self._bidirectional:
                      # Get index of pore being invaded next and apply correct
                      # entry pressure
                      pmap = net['throat.conns'][T] != pore
                      pind = list(pmap).index(True)
                      data.append(tcp[T][pind])
                  else:
                      data.append(tcp[T])
                  # Element Index
                  data.append(T)
                  # Element Type (Pore of Throat)
                  data.append(elem_type)
                  hq.heappush(queue, data)
docs: Helper method to add throats to the cluster queue