Geometrical instruments – Distance measuring – Sounding type
Patent
1992-12-14
1994-11-22
Cuchlinski, Jr., William A.
Geometrical instruments
Distance measuring
Sounding type
33711, 33702, 33775, E21B 4704
Patent
active
053656741
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to a device for measuring the displacement of a swivel of a drilling mast, and, more particularly, to such a device which is intended to manage the position of the tool in the well as well as the bottom dimension of this same well.
2. Description of the Prior Art
Two types of devices exist which are able to be used on a drilling mast so as to rotationally drive a string of pipes. The first, and the more conventional, is the turntable which is mounted on the floor of the drilling mast and comprises a square or hexagonal opening intended to receive a driving pipe of complementary cross-section. The table is set in rotation and thus gives rise to the rotation of the string of pipes.
The other type of device is the motorised swivel, wherein an electric or hydraulic motor, mounted adjacent to the travelling block, is directly connected to the upper end of the string of pipes. The motor is mounted on a carriage which slides on rails arranged vertically on the mast thus allowing the displacement of the carriage whilst absorbing the torque generated during drilling.
Regardless of the type of driving device, the driller always needs to determine the exact position of the elements of the string of pipes, and in particular of the tool arranged in the well so as to manage the drilling better. The conventional manner for determining the position of the tool consisted simply in noting the number of pipes as well as the other elements of the mass-of-pipes and stabilisers packing used and to deduce the total length therefrom. Taking into account the significant number of pipes used, a number reaching several hundred for a deep drilling, the possibility of error was not negligible. However, the consequences of such an error can be very severe if an operation is undertaken in the well at an incorrect depth.
With a motorised swivel, the alternated displacement along the rails is directly linked to the length of the pipes inserted in the drilling well. Thus, careful measurement of the total displacement of the motorised swivel during a manoeuvre or whilst drilling makes it possible to determine, with precision, the position of the tool in the well, a position which is corrected or otherwise for thermal and pressure effects and for the extension effect of the string of pipes under its own weight.
SUMMARY OF THE INVENTION
The subject of the present invention is therefore a device for measuring the displacement of a swivel of a drilling mast, which device is of simple construction, is reliable and which makes it possible to determine the position of the tool and the bottom dimension in the drilling well.
In order to do this, the invention provides a device for measuring the displacement of the upper end of the drill-pipe string, the end being supported during drilling by a fastening assembly, which can move along at least one guide rail, the measuring device comprising a sensor assembly mounted on the fastening assembly and comprising a roller fitted so as to roll on the rail during the displacement of the fastening assembly.
BRIEF DESCRIPTION OF THE FIGURES OF DRAWING
Other features and advantages of the present invention will emerge more clearly from reading the description given hereafter, by way of example, with reference to the appended drawings in which:
FIG. 1 is a perspective view of a motorised swivel, and
FIG. 2 is a view in longitudinal section of a sensor assembly according to the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a motorised swivel 10 mounted fixed on a carriage 12 equipped with rollers 14 which allow it to slide on two rails 16 arranged vertically and integral with the drilling mast (not shown). The swivel 10 comprises a motor 18 which may be electric or hydraulic and which comprises a hollow main shaft 20 which is connected by a roller-contact bearing to a swivel 22 also mounted fixed to the carriage 12. In a conventional manner, the swivel is suspended from the hook 24 of
REFERENCES:
patent: 3005264 (1961-10-01), Shaffer
patent: 3520062 (1970-07-01), Tanguy
patent: 3688410 (1972-09-01), Zeidler et al.
patent: 4535541 (1985-08-01), Penning
patent: 4830119 (1989-05-01), Haney et al.
Etchegoyhen Didier
Henneuse Henry
Cuchlinski Jr. William A.
Elf Aquitaine Production
Wirthlin Alvin
LandOfFree
Device for measuring the displacement of a swivel of a drilling does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for measuring the displacement of a swivel of a drilling , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for measuring the displacement of a swivel of a drilling will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1982719