Wells – Processes – With indicating – testing – measuring or locating
Patent
1988-09-27
1990-08-07
Kisliuk, Bruce M.
Wells
Processes
With indicating, testing, measuring or locating
166 651, 166382, 166385, E21B 2300, E21B 4700, E21B 4900
Patent
active
049459872
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method and a device for carrying out, in sections of wells sharply inclined to the vertical, or horizontal sections, operations such as measurements and/or interventions with the aid of specialized instruments.
The invention applies in particular when measurements and/or interventions are to be made with a set of one or more instruments which must be isolated from the drilling string which allowed the set to be placed in a section of the well. Such situations may be encountered when seismic profiles are to be produced.
The present invention in particular allows seismic profiles to be produced by horizontal displacement, or displacement sharply inclined to the vertical, of the set of instruments. Such profiles will henceforth be termed "horizontal seismic profiles (HSP)."
The measurements made for example include the recording of vibrations transmitted through geological formations to the set of instruments. By processing this information, a seismic profile may be made of rock strata located on both sides of a well or borehole which is horizontal or has a long inclined section, with said processing leading to knowledge of the shape of the top of a geological formation.
The measurements carried out may also include recording of the pressure and tempeature of the bottom, 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.
U.S. Pat. Nos. 4,457,370 and 4,570,709 have already proposed a method and a device for carrying out, with the aid of a specialized tool fitted with an electrical connector, measurements in a horizontal well section or one sharply inclined to the vertical. However, the method and device do not permit operations requiring isolation, such as mechanical uncoupling, of the instrument set with respect to the drilling string.
The same applies to the technique according to French Patent 2,547,861 which in addition has the disadvantage of reducing the outside diameters of the instruments.
French Patent 2,544,013 has already proposed a device and method allowing measurements and/or interventions to be carried out in a well, in a zone of this well subjected to hydraulic compression. This invention does not allow a series of measurements and/or interventions to be carried out easily at points of the well that are spaced apart. Such a method and such a device apply particularly to listening at a point of a well zone subjected to hydraulic compression, but they are not suited for making measurements of seismic profiles.
Moreover, the protective housing of the instrument set requires reduction of the diameter of this set.
The invention furnishes a method for making measurements and/or interventions in a horizontal well section or one sharply inclined to the vertical with the aid of a set of one or more measuring and/or intervention instruments located at the lower end of a rigid tubular string subjected to longitudinal compression, said set having anchoring means such as arms. This method is characterized by the following stages, in succession:
the set is positioned or held in position in the extension of the string at the lower end of this string, the set being in a first position with respect to the end,
the set and the lower part of the string are introduced into the well,
the set is made to advance down the well until the set essentially reaches a desired position,
the set is released and disengaged from its first position, then brought into a second position away from the first position, by activating anchoring means such that the set is held in the well, and moving the string forward and/or backward so that the set reaches the second position, and
the measurement and/or intervention is carried out.
When the set is separated from the string by a flexible link, the set can be released and disengaged from its first position, then brought into a second position wherein the set rests on a wall of the well and wherein the set is mech
REFERENCES:
patent: 4062551 (1977-12-01), Base
patent: 4457370 (1984-07-01), Wittrisch
patent: 4484628 (1984-11-01), Lanmon, II
patent: 4485870 (1984-12-01), Walulik
patent: 4488597 (1984-12-01), Hoppe et al.
patent: 4500155 (1985-02-01), Chevalier
patent: 4570709 (1986-02-01), Wittrisch
patent: 4664189 (1987-05-01), Wittrisch
patent: 4690214 (1987-09-01), Wittrisch
Institut Francais du Pe'trole
Kisliuk Bruce M.
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