| 摘要 |
RETRIEVING A SAMPLE OF FORMATION FLUID FROM A FORMATION LAYER TRAVERSED BY A CASED BOREHOLE COMPRISING MAKING A PLURALITY OF PERFORATION SETS THROUGH THE CASING WALL INTO THE FORMATION LAYER, WHEREIN THE ORIENTATION OF THE PERFORATION SETS IS SO SELECTED THAT THE ANGLE BETWEEN ADJACENT PERFORATION SETS EQUALS 360° DIVIDED BY THE NUMBER OF PERFORATION SETS; LOWERING A SAMPLING TOOL INTO THE BOREHOLE TO THE FIRST PERFORATION SET; TAKING A SAMPLE FROM THE FORMATION AND STORING THE SAMPLE IN THE FIRST FLUID SAMPLE CONTAINER; POSITIONING THE SAMPLING TOOL NEAR THE NEXT PERFORALION SET, TAKING A SAMPLE FROM THE FORMATION AND STORING THE SAMPLE IN THE NEXT FLUID SAMPLE CONTAINER; AND REPEATING THE LATTER STEP UNTIL SAMPLES FROM ALL PERFORATION SETS HAVE BEEN TAKEN, AND RETRIEVING THE SAMPLING TOOL.
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