13- Which the sequence in DST process is correct : a- lowering of DST tool, opening the bypass valve, flow formation fluid, sealing hole by packer b- lowering of DST tool, flow formation fluid, opening the bypass valve, sealing hole by packer c- lowering of DST tool, opening the bypass valve, sealing hole by packer, flow formation fluid d- lowering of DST tool, flow formation fluid, opening the bypass valve, sealing hole by packer Q. No. 4: answer only (10 marks) This section contains 14 multiple choice questions. Each question has four choices only one or morem correct. 1- According the figure (5) Point E to point F represent F a-Packers are set b- Packers are then released C-Fluid accumulates in the drill stem above the pressure d-Tool is on bottom