Measuring and testing – Dynamometers – Responsive to force
Patent
1992-08-07
1993-12-28
Chilcot, Jr., Richard E.
Measuring and testing
Dynamometers
Responsive to force
73862191, 73151, G01L 100
Patent
active
052729257
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rotary swivel equipped with a dynamometric measuring unit and, more especially to such a rotary swivel intended to drive a drill pipe in rotation.
2. Description of the Prior Art
There are two types of devices which can be used on a drilling mast for driving a string of pipe in rotation. The first, and the more traditional, is the rotary turn-table which is mounted on the floor of the drilling mast and comprises a square or hexagonal opening intended to receive a drive rod of complementary cross-section. The turn-table is set in rotation and thus causes the rotation of the string of pipe
The other type of device is the motorised rotary swivel, where an electric or hydraulic motor, mounted adjacent to the movable pulley block, is linked directly to the upper end of the string of pipe. The motor is mounted on a carriage which slides on rails arranged vertically on the mast thus permitting the movement of the carriage whilst absorbing the torque generated during drilling.
On the other hand, there are dynamometric measuring units which are intended to be mounted on the string of pipe in order to be able to measure the forces and sense the various vibrations of the said string of pipe which are generated during drilling and which can be characteristic either of the behaviour of the string of pipe, or of the state of wear of the tool, or even of the type of rock being destroyed.
Patent Application FR 89 08649 which was filed on 28 Jun. 1989 in the name of the applicant describes such a dynamometric measuring unit for drill pipe in which a series of sensors is mounted on a drill-rod element of reduced length, more ordinarily called "sub". This device is mounted on the upper end of the string of pipe below the automatic wrench which is arranged at the output of the motor.
Despite these advantages, the positioning of the dynamometric measuring unit below the dynamometric wrench is a source of difficulties because, during certain manoeuvres, for example the withdrawal of only some elements of the string of pipe whilst maintaining the circulation of mud, it is necessary to withdraw the measuring unit beforehand. Extra time, resulting from this withdrawal and reassembly of the measuring unit, is thus added to the manoeuvre.
SUMMARY OF THE INVENTION
The object of the present invention is to offset these drawbacks by proposing a motorised rotary swivel equipped with a dynamometric measuring unit which is of simple construction, reliable and which allows all types of manoeuvre to be carried out without disassembly of the measuring unit.
In order to do this, the invention proposes a motorised rotary swivel, intended to drive a drill pipe in rotation, comprising a motor equipped with a principal shaft, characterised in that the rotary swivel comprises, moreover, a measuring unit, comprising at least one sensor, mounted on an extension of the principal shaft adjacent to the output of the motor.
Other features and advantages of the present invention will appear more clearly on reading the description hereinbelow, which is made, by way of example, with reference to the appended drawings in which:
BRIEF DESCRIPTION OF THE FIGURES OF DRAWING
FIG. 1 is a view in perspective of a motorised rotary swivel equipped with a dynamometric measuring unit according to the present invention,
FIG. 2 is a view in perspective of a measuring unit intended to be mounted in the rotary swivel of FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIG. 1 is shown a motorised rotary swivel 10 securely mounted on a carriage 12 equipped with rollers 14 which permit the said carriage to slide on two rails 16 which are arranged vertically and are solidly connected to the drilling mast (not shown). The rotary swivel 10 comprises a motor 18 which can be electric or hydraulic and which comprises a hollow principal shaft 20 which is linked by a bearing to a rotary swivel 22 which is also securely mounted on the carriage 12. In a traditional manner, t
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Becq Denis
Henneuse Henry
Chilcot Jr. Richard E.
Dougherty Elizabeth L.
Societe Natinoale Elf Aquitaine (Production)
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