Wells – Processes – With indicating – testing – measuring or locating
Patent
1988-08-31
1990-02-06
Kisliuk, Bruce M.
Wells
Processes
With indicating, testing, measuring or locating
166 651, 166308, 166382, 166385, E21B 2300, E21B 4700
Patent
active
048982407
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method and a system allowing measurements and/or interventions to be made in a well at the level of the surrounding formations, in particular measurements of noises or vibrations for which the instruments must be mechanically uncoupled from the casing through which mechanical waves are transmitted, particularly from the surface.
The measurements made may, for example, include triaxial recording of noises produced by the rocks stressed in this manner. Analysis of vibrations detected allows the orientation of the noise source and hence the direction of propagation of the fracture to be defined. This analysis technique is well known to geophysicists and will not be described here in greater detail.
The invention applies in particular when measurements such as vibration measurements are to be made at the level of geological formations of a well located in a zone, or near to a zone, of this well or another well where hydraulic fracturing is being carried out.
The measurements made may also include recording the pressure and temperature at the bottom and measurement (focused or unfocused) of the electrical resistivity of the formations, etc.
These measurements may be supplemented by viewing the well walls with a television camera, for example.
One of the purposes of the invention is to provide a device allowing a measuring or intervention instrument to be moved in a well zone.
French Pat. Nos. FR-2,544,013, 2,564,894, and 2,573,472 already teach methods and devices for carrying out measurements and/or interventions in a well of which one zone is subjected to hydraulic compression, but the devices and methods proposed heretofore exhibit certain drawbacks in use, such as inaccuracy in maneuvering the support of the set and hence the instruments, risks of the support becoming jammed in the casing particularly because of W-shaped groove, and undesired uncoupling of the transmission cable and the support during maneuvers.
These drawbacks are eliminated, or at least very substantially attenuated, by the use of the system for moving a set of measuring and/or intervention instruments in a well according to the invention, as well as the method applicable thereto.
This system, controllable at a distance from the surface, i.e. controllable remotely, between a first position and a second position different from the first position, comprises in particular a body inside which is placed a support, whereby the body cooperates with the support to ensure movement of the support relative to the body, and the travel of the support is limited by means of two stops integral with the body, said support being mechanically connected to said set of instruments by a shaft, the system having no reversible locking means.
The system may have hydraulic means allowing the support to be moved relative to the body by the pumping of fluid.
The interior of the body may be cylindrical in shape.
The body may be place in a tube with a tubular clearance, whereby the dimensions of the clearance are greater than the dimensions of the tube.
The system may have return means such as a spring allowing the support to assume either of the positions defined above, by default.
When the system has a cable connected to the surface, one of whose ends is attached to a loading bar and has means for moving the suspension cable, the support may have a bar-centering guide and means designed to fasten the bar to the support, said connecting means being capable of being moved aside.
When the set is electrically connected to the surface, the device may have an electrical transmission cable connected to the surface, one of whose ends has a connecting plug pluggable in a liquid medium, designed to cooperate with a matching socket integral with the support, the matching socket being connected to said set by a electrical connecting cable.
The connecting means may include a drive element and a receiving element cooperating with the drive element, whereby the drive element is integral with the loading bar and is driven from the surface by mean
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patent: 4690214 (1987-09-01), Wittrisch
Institut Francais du Pe'trole
Kisliuk Bruce M.
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