Wells – Processes – Placing or shifting well part
Patent
1990-08-03
1991-10-01
Kisliuk, Bruce M.
Wells
Processes
Placing or shifting well part
166179, 166187, 166191, 138 93, E21B 3312, F16L 55128
Patent
active
050524925
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for sealing-off elongated, hollow cavities, such as circular-cylindrical pipes, tubes, drill holes and the like, in which a body is placed in said cavity in sealing contact with the inner defining surface(s) thereof.
The invention also relates to a device for carrying out the method.
There is often a need within, for instance, the fields of geotechnology and geology to seal off effectively tubes or pipes which have been installed in the ground or in holes drilled in a rock. The task of sealing off such cavities is often encumbered with considerable problems, such as when the seal is to be located at considerable depths, is required to be durable over long periods of time and is intended to withstand considerable pressures, for instance.
The object of the present invention is to provide an effective and highly simple solution to this problem and one which will satisfy the aforesaid requirements.
By way of example, the invention may applied in connection with an arrangement or a system essentially of the kind disclosed in Swedish Patent Specification No 432 306.
The invention thus relates to a method for sealing elongated, hollow cavities such as circular-cylindrical pipes or tubes, drill holes and like configurations, in which a body is placed in the cavity in sealing contact with the internal defining surface(s) thereof. The method is particularly characterized in that at least one substantially annular and elastic sealing element, sealingly arranged in a gap which extends radially and circumferentially of the body, is caused to be urged radially outwards into sealing abutment with the inside surface of the cavity, by means of pressure applied from within the body.
The invention also relates to a device for sealing elongated, hollow cavities, such as circular-cylindrical tubes or pipes, drill holes or like configurations, comprising a body which is intended to be placed in the cavity in sealing contact with the inner defining surface(s) thereof. The device is particularly characterized in that a substantially annular, elastic sealing element is sealingly arranged in a gap which extends radially and circumferentially in the body, and in that channels are provided through which pressure is applied internally of the body such as to urge the sealing element radially outwards and into sealing abutment with the inner defining surface of the cavity.
The invention will now be described in more detail with reference to exemplifying embodiments thereof and to the accompanying drawings, in which
FIG. 1 is a principle drawing of an inventive device intended for use in connection with a circular-cylindrical tube or pipe;
FIGS. 2a-d are axial views which illustrate part of an inventive device in various stages of a cavity sealing process;
FIG. 3a illustrates a structural element according to the invention from which an inventive device is obtained;
FIG. 3b is a sectional view taken on the line A--A in FIG. 3a;
FIG. 4 is an axial sectional view of part of a first embodiment of a device constructed in accordance with the invention and based on the structural element of FIGS. 3 (3a and 3b);
FIG. 5a is an axial sectional view of part of a second embodiment of an inventive device;
FIG. 5b is a verticle side view of the device illustrated in FIG. 5a;
FIG. 6 illustrates schematically the use of a third embodiment of an inventive device; and
FIG. 7 illustrates a fourth embodiment of an inventive device.
In FIG. 1 the reference 1 indentifies a substantially circular-cylindrical body which is intended to seal a circular-cylindrical pipe or tube 2 with the aid of a sealing element 3, such as an O-ring, via which the body 1 is intended to lie in sealing contact with the inner surface 4 of the pipe 2. The reference 5 identifies a nipple device which enables connection to a pressure line, not shown in FIG. 2. The body 1, together with the sealing element 3, is intended to be inserted down into the pipe 2, which in the illustrated case consists of an elongated, hollow cavity 2, and be brought
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patent: 4342336 (1982-08-01), Satterthwaite et al.
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