U.S. patent application number 11/893381 was filed with the patent office on 2008-03-06 for device for holding drill pipe.
Invention is credited to Jens Lutzhoft, Ronaldus R. M. Roling.
Application Number | 20080054662 11/893381 |
Document ID | / |
Family ID | 38474232 |
Filed Date | 2008-03-06 |
United States Patent
Application |
20080054662 |
Kind Code |
A1 |
Lutzhoft; Jens ; et
al. |
March 6, 2008 |
Device for holding drill pipe
Abstract
A device for connecting and disconnecting pipe segments of drill
pipes, includes an adjustable retaining element in the form of a
collar. For firmly holding the pipe segments introduced into the
collar, segments acting as clamping jaws are used for retention.
The clamping jaws can be adjusted vertically by servo elements for
reducing the receiving diameter. The segments have a conical
outside contour and a conical guide on the collar and a
corresponding conical guide is provided on the collar, so that,
when the segments are vertically displaced, the receiving diameter
is reduced.
Inventors: |
Lutzhoft; Jens; (Hamburg,
DE) ; Roling; Ronaldus R. M.; (Hamburg, DE) |
Correspondence
Address: |
Friedrich Kueffner
Suite 910
317 Madison Avenue
New York
NY
10017
US
|
Family ID: |
38474232 |
Appl. No.: |
11/893381 |
Filed: |
August 15, 2007 |
Current U.S.
Class: |
294/113 ;
294/102.2 |
Current CPC
Class: |
E21B 19/07 20130101 |
Class at
Publication: |
294/113 ;
294/102.2 |
International
Class: |
E21B 19/07 20060101
E21B019/07 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 17, 2006 |
DE |
10 2006 038 763.5 |
Claims
1. A device for an adjustable vertical holding of drill pipe having
a plurality of pipe segments connected to each other in a row by
connecting elements, for use on drilling platforms having a
removable holder on a rotating table for inserting and removing
drill pipe, the device comprising: a retaining element (1)
connected to the drill pipe for installing and removing the
connecting elements between the pipe segments and for handling by
winches; wherein the retaining element (1) is a collar adapted to
be placed on the drill pipe, and having elements (17) in an outer
area thereof which allow the retaining element to be connected to
the winch; wherein an interior space (4) of the retaining element
(1) for receiving the drill pipe has a cylindrical receiving area
comprised of vertically adjustable segments (5) as clamping jaws
for changing the receiving diameter, wherein the adjustable
segments (5) have a conical external contour (6) and are slidable
along a corresponding conical guide (7) in the collar of the
retaining element (1) to adjust the diameter of the receiving
opening (4), wherein the clamping hold on the drill pipe being held
can be adjusted by means of controllable servo cylinders (11),
which are installed above the segments (5) and which shift the
segments vertically with respect to the collar of the retaining
element (1) for narrowing the receiving opening (4); wherein the
servo cylinders (11) act by way of ribs (9) on external areas of
the segments, and the ribs on the segments (5) with corresponding
ribs (10) on the collar of the retaining element (1) hold a guide
rod (8) for holding, which guides a compressible compression spring
(14) between the ribs (9, 10).
2. The device according to claim 1, wherein the servo cylinders
(11) mounted on the collar of the retaining element (1) act by way
of sleeves (13) on the ribs (9) of the segment (5) to adjust
them.
3. The device according to claim 1, wherein the servo cylinders
(11) for adjusting the segments (5) are compressed-air cylinders
mounted on the collar (1).
4. The device according to claim 3, wherein the compressed air
cylinders (11) are connected to each other.
5. The device according to claim 1, wherein receiving surfaces of
the segments (5) for the drill pipe are formed by inserted clamping
elements (16) with contact surfaces in the form of a sawtooth
profile.
6. The device according to claim 1, wherein the retaining element
(1) is a collar which can be opened and locked.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a device for the adjustable
vertical holding of drill pipe consisting of a plurality of pipe
segments connected to each other in a row by connecting elements,
for use on drilling platforms, with a removable holder on the
rotating table for inserting and removing drill pipe, [0003] where
a retaining element, which can be used to install or to remove the
connecting elements between the pipe segments and to allow handling
by winches is connected to the drill pipe; [0004] where the
retaining element is in the form of a collar, which can be placed
on the drill pipe, and which has elements in its outer area which
allow it to be connected to the winch; and [0005] where the
interior space of the retaining element for receiving the drill
pipe has by means of vertically adjustable segments as clamping
jaws for changing the receiving diameter with a cylindrical
receiving area.
[0006] 2. Description of the Related Art
[0007] These types of arrangements are used in the area of offshore
drilling platforms to connect and to disconnect the large number of
pipe segments which are arranged in a row and which are connected
to each other by connecting elements. It is known that retaining
elements can be turned into the end of the pipe segment for
handling, and that a winch, located above the end of the pipe, can
act on these retaining elements by means of appropriate connections
so that adjacent pipe segment can be connected to each other or
disconnected from each other. The drill pipe is also held in place
on the rotary table in this way to prevent it from sliding off and
from sinking in the water.
[0008] Arrangements for handling and holding drill pipe are known
from DE 42 27 645 A1 and DE 697 24 670 T2. In these cases, however,
pipe shoulders must be present on the drill pipe so that it can be
handled. It is also necessary to use an intermediate ring, a
so-called "setting ring", which presses down the wedge-shaped
elements.
[0009] These designs often cause damage and have the result that
the elevator rings used do not close properly.
SUMMARY OF THE INVENTION
[0010] The object of the invention is to create a simple retaining
element which ensures that the pipe segment will be held securely
even in the absence of pipe shoulders or adapter pieces with the
necessary security and that the retaining forces in the collar of
the retaining element will be adjusted automatically by the weight
of the connected pipe segments.
[0011] This object is met according to the invention in that the
adjustable segments have a conical external contour and can slide
along a corresponding conical guide in the collar of the retaining
element to adjust the diameter of the receiving opening, where the
clamping hold on the drill pipe being held can be adjusted by means
of controllable servo cylinders, which are installed above the
segments and which shift the segments vertically with respect to
the collar of the retaining element, thus narrowing the receiving
opening, where the servo cylinders act by way of ribs formed on the
external area of the segments, and the ribs on the segments with
corresponding ribs on the collar of the retaining element hold a
guide rod for holding, which guides a compressible compression
spring between the ribs.
[0012] As a result of this arrangement, the pipe segments can be
easily handled by placing the collar onto the drill pipe to serve
as a retaining element and by adjusting the initial clamping action
by way of the relatively small servo cylinders acting on the
segments. The actual retaining forces are adjusted automatically by
the weight of the pipe segments themselves, during which the
segments shift while the retaining ring serves as a bearing. Thus
the servo cylinders are not required to generate the holding forces
for the pipe segments but instead serve merely to produce the
initial clamping action for carrying the pipe segments.
[0013] An advantageous embodiment is created in that, to adjust the
position of a segment, each of the servo cylinders mounted on the
collar of the retaining element acts by way of a sleeve on a rib of
the segment.
[0014] A simple embodiment is obtained in that the adjusting
elements for adjusting the segments are formed by compressed-air
cylinders mounted on the collar.
[0015] To ensure a uniform force distribution, it is proposed that
the mounted compressed-air cylinders used as adjusting elements for
the segments be connected to each other.
[0016] To improve the fit and to increase the holding power, it is
proposed that the receiving surface of the segments for the drill
pipe have by means of inserted clamping elements with contact
surfaces in the form of a sawtooth profile.
[0017] In addition, the retaining element is designed as a collar
which can be opened and locked closed.
[0018] The various features of novelty which characterize the
invention are pointed out with particularity in the claims annexed
to and forming a part of the disclosure. For a better understanding
of the invention, its operating advantages, specific objects
attained by its use, reference should be had to descriptive matter
in which there are described preferred embodiments of the
invention.
BRIEF DESCRIPTION OF THE DRAWING
[0019] In the drawing:
[0020] FIG. 1 is a side view of a retaining element;
[0021] FIG. 2 is a top view of the element according to FIG. 1;
[0022] FIG. 3 is a partial cross sectional view along line III-III
of FIG. 2; and
[0023] FIG. 4 is an enlarged view, in isolation, of the area marked
IV in FIG. 3.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0024] In the illustrated arrangement, a retaining element 1 for
receiving a drill pipe (not shown) in the form of a pipe segment is
shown in the form of an openable collar. This collar 1 is formed by
two elements 2 and 3, which can swing open in a hinge-like manner.
The collar can then be placed around a pipe segment and then closed
and locked. Of course, the retaining element could be designed as a
closed collar 1 with a central receiving opening 4, into which a
pipe segment can be inserted.
[0025] The cross section of the receiving opening 4 can be adjusted
by the use of four segments 5, where the segments 5 are designed as
clamping jaws acting on the received pipe segment and are
vertically adjustable. For this purpose, the segments 5 have a
conical outside contour 6 and a corresponding guide 7 in the collar
1 serving as retaining element 1.
[0026] The segments 5 are held in the collar 1 by guide rods 8, and
the guide rods 8 are held on the segments 5 by the ribs 9 and on
the collar 1 by the ribs 10.
[0027] Above the segments 5 are pneumatic servo cylinders 11, which
can be controlled by way of lines 12 and which adjust the segments
5 vertically downward by way of an intermediate sleeve 13. As a
result of the cooperation between the conical surfaces 6 and 7, the
servo cylinders reduce the size of the receiving opening 4 and thus
exert a clamping action on the received pipe segment.
[0028] The servo cylinders 11 with the interposed sleeves 13 act on
the ribs 9 of the segments 5.
[0029] To increase the restoring force when the clamping action is
released, compressible compression springs 14 are installed on the
guide rods 8 between the ribs 9 of the segments 5 and the ribs 10
of the collar 1.
[0030] The servo cylinders 11 are held in place on the collar 1 by
a housing 15.
[0031] In this embodiment, the cylindrical receiving surface of the
segments 5 for the pipe segments is formed by inserted clamping
elements 16 with a sawtooth profile.
[0032] To insert the drill pipe and to pull it back out again, a
winch is installed above the collar 1 holding the received pipe
segment. The winch acts on the collar 1 from both sides by way of
elements 17, which serve as receivers for shackles 18 or the like,
as indicated in FIG. 2.
[0033] As a result, the collar 1 can be fixed in place on a pipe
segment to hold and adjust it, thus allowing the winch to adjust
the position of the pipe segment as desired so that the connecting
elements between the pipe segments can be installed or removed.
[0034] While specific embodiments of the invention have been
described in detail to illustrate the inventive principles, it will
be understood that the invention may be embodied otherwise without
departing from such principles.
* * * * *