Patent EA-001781-B1 (EA)
Title: Logging method
Inventor: RUNIA DOUWE JOHANNES
IPC: E21B47/01
Filed: 1997-07-22
Abstract: 1. A method of operating a logging tool in a wellbore formed in an earth formation, the wellbore having at least a section which is to be provided with a wellbore component (9) the method comprising: - arranging the logging tool (15) in a selected relationship relative to said component (9) so that the logging tool is guided by the component (9) through the wellbore (1) during lowering of the component into the wellbore; - lowering the component (9) with the logging tool (15) in said selected relationship, through the wellbore (1) to said section of the wellbore; - operating the logging tool (15) so as to provide logging data of the earth formation (3) surrounding the wellbore; and - transferring the logging data to surface, characterized in that the logging tool (15) is retrievably arranged relative to said component (9), and that after operating the logging tool, the logging tool is retrieved to surface while the wellbore component is left downhole. 2. The method of claim 1, wherein the logging tool (15) is operated during lowering of the component (9) with the logging tool in said selected relationship, through the wellbore (1) to said section of the wellbore. 3. The method of any one of claims 1 or 2, wherein the logging tool (15) is operated when the logging tool is located in said section of the wellbore (1). 4. A system for operating a logging tool in a wellbore formed in an earth formation, the wellbore having at least a section which is to be provided with a wellbore component (9), the system comprising means for logging tool, said logging tool is retrievably arranged relative to said component, said component forms a tubular element, wherein and the logging tool is at least partly arranged within the tubular element. 5. The system of claim 4, wherein the logging tool (15) is connected to the inner surface of the element (9) at a selected side thereof, said side corresponding to a section of the earth formation (3) to be logged. 6. The system of claim 4 or 5, wherein the logging tool (15) is arranged within a retaining device attached to the inner surface of the tubular element. 7. The system of claim 6, wherein the retaining device (27) is a tube made of a fibre-reinforced material. 8. The system of claim 7, wherein the fibre-reinforced material is selected from glass fibre-reinforced epoxy and fibre-reinforced cement. 9. The system of any of claims 4-8, wherein the logging tool (15) is selected from the group comprising one of a gamma ray logging device (17), a density logging device (21), a neutron logging device (19), an NMR logging device, a resistivity logging device, a micro resistivity/calliper logging device, a sonic logging device and any other suitable logging device. 10. The system of claim 9, wherein the logging tool (15) includes a plurality of said logging devices arranged in a stacked manner. 11. The system of claim 9 or 11, wherein the component (9) is provided with a window (25) opposite a selected one of said logging devices. 12. The system of claim 11, wherein said window (25) is filled with a material suitably transparent to the logging tool signal. 13. The system of claim 12, wherein said material is selected from fibre reinforced plastic, glass fibre reinforced epoxy and fibre reinforced cement. 14. The system of claim 11, wherein said logging device forms a pad type device extending though the window so as to contact the wellbore wall. 15. The system of any of claims 4-14, wherein the logging data are stored in the logging tool (15) and are transferred to surface by lowering a pump-down latching device (33) into the wellbore (1), the latching device being connectable to the logging tool (15) and being provided with logging data retrieving means (37), pumping the latching device (33) through the wellbore until the latching device is connected to the logging tool, and transferring the logging data via the logging data retrieving means (37) to surface. 16. The system of claim 15, wherein the tubular element (9) is provided with a guide funnel so as to guide the latching device to the logging tool during connecting the latching device (33) to the logging tool. 17. The system of claim 15 or 16, wherein the latching device (33) is provided with logging tool retrieving means, and wherein the logging tool is retrieved to surface using said logging tool retrieving means after measuring said parameter. 18. The system of any of claims 4-17, wherein the wellbore component (9) is selected from a wellbore casing, a wellbore liner, a slotted wellbore liner, an expandable slotted liner, a pre-perforated liner, a wellbore screen, a wire-wrapped screen, and a gravel pack screen. 19. The system of claim 18, wherein the wellbore component (9) forms a wellbore casing having a casing shoe track (11), and wherein the logging (15) tool is at least partly arranged in said casing shoe track. 20. The system for operating a logging tool in a wellbore formed in an earth formation, the wellbore having at least a section which is to be provided with a wellbore component, the system comprising: - means (27) for arranging the logging tool (15) in a selected relationship relative to said component (9) so that the logging tool is guided by the component through the wellbore during lowering of the component into the wellbore; - means (5) for lowering the component with the logging tool (15) in said selected relationship, through the wellbore (1) to said section of the wellbore; - means (23) for operating the logging tool so as to provide logging data of the earth formation surrounding the wellbore; and - means (37) for transferring the logging data to surface, characterized in that the means for arranging the logging tool (15) relative to said component (9) includes means for retrievably arranging the logging tool relative to said component, and that the system further comprises means (33) for retrieving the logging tool to surface while the wellbore component is left downhole.