Wells – Processes – With indicating – testing – measuring or locating
Patent
1995-09-05
1997-02-25
Neuder, William P.
Wells
Processes
With indicating, testing, measuring or locating
166153, 166383, E21B 2308
Patent
active
056051921
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a means and a method to displace a logging tool to the bottom of a well for withdrawal through the well.
2. Discussion of the Prior Art
Well known is to lower logging tools into the casings of wells to register parameters of different kinds along the depth of the well. In substantially vertically directed wells, the gravity forces aims lowering the tool to the desired position such as the bottom of the well. The increased use of deviation drilling, creates wells having their main axis direction extending in angles to the vertical plane, which obviously are increasing and already may extend approximately in the horizontal direction. In such a well, the axis of which is deviating strongly from the vertical direction, difficulties arise in positioning logging tools at the bottom or the end of the well, due to the decreasing effect available from the gravity forces.
In fact, such a tool may be brought to the end of the well by assembling drill pipes, which, however, is a rather expensive and time consuming operation.
SUMMARY OF THE INVENTION
The method and means according to the present invention provide a secure and efficient way to transport a logging tool down through a well, in fact even enabling measurement of parameters during the descending operation as well as the following ascending operation. Necessary equipment is easily installed on the drilling deck of a platform offshore or in other suitable structure on shore. The invention is applicable for utilization in wells independently of the angle the axis is deviating from the vertical plane.
The above mentioned advantages are achieved with the method and means according to the present invention as defined by the features stated set forth in more specific detail hereinbelow.
BRIEF DESCRIPTION OF THE DRAWING
The only FIGURE discloses an axial section through the means according to the invention, in a position ready for descending into the well.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
The means according to the present invention, comprises a plug 14 having a through-going hole in which two sleeves 12 and 16 are inserted, one from each end. To the lower end of the lower sleeve 16 is secured an abutment plate 17. The sleeve 16 is secured to the plug 16 such that the plate 17 is arranged at a distance from the lower end of the plug 14, said distance being larger than the distance between the two sleeves 16 and 12 in the through-going hole of the plug 14. Correspondingly a plate 11 is secured to the upper end of the upper sleeve 12 which protrudes a certain distance above the upper surface of the plug 14.
Sleeves 12 and 16 both are secured to the plug 14 by rupture pins 13 and 15 respectively. Rupture pins 15 in the lower sleeve 16 are made weaker than rupture pins 13 in the upper sleeve 12. Securement of the sleeves may be achieved also by electric or hydraulic means, enabling a locking function to be remote released when reaching desired position or the bottom or end of the casing or well.
A securement clevis 9 is connected with the upper plate 11. A shock absorber 8 furthermore connects the clevis 9, which preferably is made of a light metal type material, with a securement clevis 7 made of metal and being connected with a swivel 6 to which a logging tool 5 is connected. By means of a weak point connection 3, the logging tool 5 is connected with a wire 2 for lowering and lifting the equipment. The weak point connection 3 may be helpful in cases where the logging tool 5 is jammed in the casing, thereby making it possible to haul up the wire alone.
Shock absorber 8 hamper external effects on the logging tool while ascending and descending, thereby to ensure measurement results of good quality, e.g. to avoid influence from the lower sleeve 12 or its upper plate 11 on the path and velocity of the logging tool 5.
Preparing the equipment for use comprises a cover 4 through the upper end of which an aperture with a mud seal 1 is arranged, thereby allowing th
REFERENCES:
patent: 4349072 (1982-09-01), Escaron et al.
patent: 4488597 (1984-12-01), Hoppe et al.
patent: 4570709 (1986-02-01), Wittrisch
patent: 5209304 (1993-05-01), Nice
Den Norske Stats Oljeselskap A.S.
Neuder William P.
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