GB904131A - Borehole apparatus - Google Patents

Abstract

904,131. Boring earth &c. SCHLUMBERGER WELL SURVEYING CORPORATION. Aug. 8, 1960 [Aug. 12, 1959], No. 27474/60. Class 85. Apparatus for sampling fluid from a formation 13 comprises a body 16, 17, 18, a seal 21 on the body surrounding the initially closed end of a conduit 65, 66, 70, 72 connected to a sample-receiving chamber 73, a device 23 on the body hydraulically operated to press the seal against the formation, a perforator 59 for opening the conduit to fluid from the formation, pressure-measuring means 68 in the part 66 of the conduit, and a valve 67 to close the conduit between the parts 70, 72. When the apparatus is positioned with the seals 21, 22 opposite the formation a valve 51 is opened to permit bore fluid 15 to flow through aperture 52 to pressure means 30 which supplies amplified pressure to cylinder 33 so that the device 23 engages to formation and presses the seals against the formation. Shaped changes 59, 60 are detonated, and formation fluid flows through conduit parts 65, 66 to the valve 67. When the pressure has built up sufficiently the valve 67 is opened and the fluid flows to the chamber 73. If bore fluid enters the conduit the increased pressure closes a valve 71 to prevent contamination of the fluid sample. After the sample has been obtained a valve 36 is opened so that a valve 38 closes the chamber 73. A valve 40 is opened to allow bore fluid to enter a conduit 110 to equalize the pressures in the hydraulic system so that the springs 112, 113 retract the device 23. The valves 36, 40, 51, 67 are electrically actuated from the surface; The transducers 42, 62 are connected to dials 44, 69 and a recorder 45 to give indications of the pressures in the pipe 32 and of the formation fluid. The bore may be cased.