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Drill string shock absorber

Info

Publication number
CA2120788C
CA2120788C CA 2120788 CA2120788A CA2120788C CA 2120788 C CA2120788 C CA 2120788C CA 2120788 CA2120788 CA 2120788 CA 2120788 A CA2120788 A CA 2120788A CA 2120788 C CA2120788 C CA 2120788C
Authority
CA
Grant status
Grant
Patent type
Prior art keywords
shock
member
resilient
absorber
drill
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CA 2120788
Other languages
French (fr)
Other versions
CA2120788A1 (en )
Inventor
Bernard Lionel Gien
Original Assignee
Bernard Lionel Gien
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods ; Cables; Casings; Tubings
    • E21B17/10Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1042Elastomer protector or centering means
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods ; Cables; Casings; Tubings
    • E21B17/02Couplings; joints
    • E21B17/04Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/07Telescoping joints for varying drill string lengths; Shock absorbers
    • E21B17/073Telescoping joints for varying drill string lengths; Shock absorbers with axial rotation

Abstract

The invention concerns a shock absorber for use with a borehole drill string and which is to take rotational load and absorb axial shock loading, the absorber consisting essentially of a pair of oppositely disposed components adapted for connection into a drill string and positioned on opposite sides of a resilient member the latter held between rigid rings around and separate from the components each ring secured to the component on the opposite side of the member.

Description

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INTRODUCTION

This invention relates to shock absorbers which are included in drill strings and with borehole drilling machines.

BACKGROUND OF THE INVENTION

Drilling machines utilise drill strings to l,ansmit power down predrilled holes to a drill bit at the bottom of the hole. The drill bit may be operated by a down-the-hole hammer assembly or by a rotary action.

Whatever method is used it is highly desirable that a shock-absorber be incorporated in the drill string between the bit and the driving head. This is usually done by positioning the shock-absorber between the driving head and the first drill rod of the drill string.

3 2 ~ 20 788 ~
Known types of shock absorbers, which must absorb axial shock loading and the torque applied to the drill string, have either cumbersome casings with two sets of rubber elements or one element with straps holding the top and bottom halves of the shock absorbers together.

OBJECT OF THE INVENTION

It is the object of this invention to provide a shock absorber of the kind referred to which will transmit torque through a resilient member which will also absorb axial shock loading applied to the drill string with which it is used.

SUMMARY OF THE INVENTION

10 According to this invention there is provided a shock absorber for use with a drilling machine, comprising: a pair of oppositely disposed components adapted for connection into a drill string and positioned on opposite sides of a resilient member; the resilient member being held between rigid rings around and separate from the components; each ring being secured to one of the oppositely disposed components and on the opposite side of the resilient member.

Further features of this invention provide for the securing means to be bolts extending inwardly through the resilient member from the rings to the components and for the rings to seat on faces of the resilient member inclined to the axis of the components.

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The invention also provides for the bolts to be located in spacer sleeves and for the resilient member to be a block of s~lit~''e elastomeric material with an axial passage therethrough.

BRIEF DESCRIPTION OF THE DRAWING

A pref~r, ed embodiment of this invention is described below with reference to the accompanying drawing which illustrates one form of shock absorber in cross-section.

DETAILED DESCRIPTION OF THE DRAWING

As shown the shock absorber (I) consis~s of a pair of components (2) and (3) one adapted for connection to a drilling head and the other to the first drill rod of a drill string for a borehole drill bit. The components have an axial passageway (4) therethrough.

The components have inclined faces (5) and (6) which enable their oppositely disposed ends (7) and (8) to be countersunk into a resilient member in the form of a block (9) of elastomeric material. This material is preferably polyurethane. The block also has an axial passage (10) therethrough. The peripheral corners of the block (9) are chamfered to provide surfaces (Il) and (12) against which rigid rings (13) and (14) seat. These rings are bored to receive bolts (15) which extend through holes (16) through the block (9) so that each ring is bolted to the component on the opposite side of the block (9). That is, ring (13) is secured to component (3) and ring (14) is secured to component (2).

21207~8 Spacer sleeves (17) are provided in the holes (16) around the bolts (15).

The assembly forms a compact unit which can readily transmit torque and which will absorb axial shocks applied through the drill string in use.

It will be appreciated that this invention is not limited to the particular example described.
Variations may be made and in particular the resilient member need not be of the shape described but can be a flat ring.

It will be appreciated that the securing means des~i-iLed above as being bolts is not the only suitable means for securing the components togell,er. It is quKe possible to have pins and plates or washers which are welded in position. Due to the angle of the pins through the block of material it will not be necessary to weld the inner ends of the pins, and plates around the outer ends can be welded in position. It will in most cases however be advantageous to have the inner ends of the pins also welded in position.

Claims (10)

1. A shock absorber for use with a drilling machine, comprising:
a pair of oppositely disposed components adapted for connection into a drill string and positioned on opposite sides of a resilient member;
said resilient member being held between rigid rings around and separate from the components;
each said ring being secured to one of said oppositely disposed components and on the opposite side of said resilient member.
2. A shock absorber for use with a drilling machine as claimed in claim 1, including securing means for securing each said ring to its respective said oppositely disposed component, said securing means being bolts extending inwardly through the resilient member from the rings to the components.
3. A shock absorber for use with a drilling machine as claimed in claim 1, in which the rings seat on faces of the resilient member inclined to the axis of the components.
4. A shock absorber for use with a drilling machine as claimed in claim 2, in which the bolts are located in spacer sleeves.
5. A shock absorber for use with a drilling machine as claimed in claim 1, in which the resilient member is a block of elastomeric material having an axial passage therethrough.
6. A shock absorber for use with a drilling machine as claimed in claim 2, in which each said resilient member is provided with a face inclined to the axis of its said respective components, and said ring seats on said face.
7. A shock absorber for use with a drilling machine as claimed in claim 3, including spacer sleeves, and said bolts being located in said spacer sleeves.
8. A shock absorber for use with a drilling machine as claimed in claim 2, in which said resilient member is a block of elastomeric material provided with an axial passage therethrough.
9. A shock absorber for use with a drilling machine as claimed in claim 3, in which said resilient member is a block of elastomeric material provided with an axial passage therethrough.
10. A shock absorber for use with a drilling machine as claimed in claim 4, in which said resilient member is a block of elastomeric material provided with an axial passage therethrough.
CA 2120788 1993-04-27 1994-04-07 Drill string shock absorber Expired - Fee Related CA2120788C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ZA93/2927 1993-04-27
ZA9302927 1993-04-27

Publications (2)

Publication Number Publication Date
CA2120788A1 true CA2120788A1 (en) 1994-10-28
CA2120788C true CA2120788C (en) 1999-03-30

Family

ID=25582792

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2120788 Expired - Fee Related CA2120788C (en) 1993-04-27 1994-04-07 Drill string shock absorber

Country Status (2)

Country Link
US (1) US5377772A (en)
CA (1) CA2120788C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2757562B1 (en) * 1996-12-24 1999-03-19 Total Sa A drilling tool with shock absorbers
FR2827333B1 (en) * 2001-07-12 2004-01-09 Hutchinson Damping device for a drilling rig
US6902157B2 (en) * 2003-04-08 2005-06-07 Raytheon Company Vibration isolator
US7779932B2 (en) * 2007-10-22 2010-08-24 Longyear Tm, Inc. Drill-string shock absorbers
GB201420246D0 (en) * 2014-11-14 2014-12-31 Rolls Royce Plc Apparatus for damping machining vibrations

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1861815A (en) * 1931-02-09 1932-06-07 Douglas R Radford Wear preventer
US2482962A (en) * 1946-02-08 1949-09-27 Reed Roller Bit Co Tool joint wear collar
US4279850A (en) * 1979-05-15 1981-07-21 Lynch Paul E Drill pipe tool joint protector
US5234063A (en) * 1991-06-11 1993-08-10 Collinsworth Stephen M Removable wear protective means for a drilling tool

Also Published As

Publication number Publication date Type
CA2120788A1 (en) 1994-10-28 application
US5377772A (en) 1995-01-03 grant

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed