EP3052738A1 - Multi-start thread connection for downhole tools - Google Patents
Multi-start thread connection for downhole toolsInfo
- Publication number
- EP3052738A1 EP3052738A1 EP14850309.7A EP14850309A EP3052738A1 EP 3052738 A1 EP3052738 A1 EP 3052738A1 EP 14850309 A EP14850309 A EP 14850309A EP 3052738 A1 EP3052738 A1 EP 3052738A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotary power
- torque
- power source
- start thread
- transmitting members
- 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.)
- Withdrawn
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/03—Couplings; joints between drilling rod or pipe and drill motor or surface drive, e.g. between drilling rod and hammer
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
- E21B17/0423—Threaded with plural threaded sections, e.g. with two-step threads
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/02—Fluid rotary type drives
Definitions
- TITLE MULTI-START THREAD CONNECTION FOR
- This disclosure relates generally to oilfield downhole tools and more particularly to methods and devices for transferring rotary power to a consumer.
- BHA Bottom Hole Assembly
- the BHA is attached to the bottom of a drill string, which is usually either a jointed rigid pipe or a relatively flexible spoolable tubing commonly referred to in the art as "coiled tubing.”
- a drill string which is usually either a jointed rigid pipe or a relatively flexible spoolable tubing commonly referred to in the art as "coiled tubing.”
- jointed pipe is utilized, the drill bit is rotated by rotating the jointed pipe from the surface and/or by a mud motor contained in the BHA. In the case of coiled tubing, the drill bit is rotated by the mud motor.
- BHA's may often incorporate equipment that require the transfer of rotary power from a generator to a consumer; e.g., from a drilling motor to a drill bit.
- the transfer of such rotary power often occurs across two or more torque transmitting elements such as shafts.
- the present disclosure addresses the need for threaded couplings that provide enhanced torque transmitting capabilities during the transfer of rotary power between two or more torque transmitting elements.
- the present disclosure relates to an apparatus for transferring rotary power to a consumer in a wellbore.
- the apparatus may include a conveyance device configured to be disposed in the wellbore; a rotary power source positioned along the conveyance device, the rotary power source generating a torque; and a drive train connected to the rotary power source, the drive train transferring the torque from the rotary power source to a consumer.
- the drive train includes at least two torque transmitting members connected by a multi-start thread connection that has at least two helically wound intertwined threads.
- FIG. 1 illustrates a drilling system made in accordance with one embodiment of the present disclosure
- FIG. 2 illustrates a drilling motor assembly using one or more threaded couplings made in accordance with embodiments of the present disclosure
- FIG. 3A illustrates a two-start thread configuration in accordance with one embodiment of the present disclosure
- FIG. 3B illustrates an end view of a two-start thread configuration in accordance with one embodiment of the present disclosure
- FIG. 4 schematically illustrates an end view of a three-start thread configuration in accordance with one embodiment of the present disclosure.
- the present disclosure relates to devices and methods for enhanced threaded connections between a driving rotating member and a driven rotating member. Threaded connections for torque transmission from one component to another can become damaged if over-torqued. To increase the torque capacity, the present disclosure uses a multi-start thread to reduce the induced shoulder load between two threaded components for a given torque. Additionally, the "make-up" and “break up” may be faster for such threaded connections.
- the present disclosure is susceptible to embodiments of different forms. The drawings show and the written specification describes specific embodiments of the present disclosure with the understanding that the present disclosure is to be considered an exemplification of the principles of the disclosure, and is not intended to limit the disclosure to that illustrated and described herein.
- FIG. 1 there is shown an embodiment of a drilling system 10 utilizing a bottomhole assembly (BHA) 60 configured for drilling wellbores. While a land system is shown, the teachings of the present disclosure may also be utilized in offshore or subsea applications.
- BHA bottomhole assembly
- FIG.l a laminated earth formation 11 is intersected by a wellbore 12.
- the BHA 60 is conveyed via a drill string 22 into the wellbore 12.
- the drill string 22 may be jointed drill pipe or coiled tubing, which may include embedded conductors for power and / or data for providing signal and / or power communication between the surface and downhole equipment.
- the BHA 60 may include a drill bit 62 for forming the wellbore 12.
- the BHA 60 may include one or more rotary power sources such as a drilling motor 120.
- a pressurized drilling fluid is pumped down to the BHA 60 from the surface via the drill string 22.
- This flowing drilling fluid may be utilized to energize the drilling motor 120, which generates rotary power that rotates the drill bit 62.
- the flowing drilling mud can also energize turbines or other similar devices that extract energy from the flowing drilling fluid.
- the extracted energy may be utilized to generate electricity and / or pressure hydraulic fluids. It should be understood that generating rotary power (i.e., generating useful torque) and electrical power generation and pressuring of fluids are merely illustrative of a variety of functions that may be performed by a consumer of rotary power.
- the drilling motor 120 is a positive displacement motor that includes a rotor 122 disposed in a stator 124 forming progressive cavities 123 there between. Fluid supplied under pressure to the motor 120 passes through the cavities 123 and rotates the rotor 122.
- the rotor 122 in turn is connected to the drill bit 62 (Fig. 1) via a drive train 125 that is formed of two or more interconnected torque transmitting members.
- the drive train 125 includes a flex shaft 126 connected to a drive shaft 128 at a pin and box connection 130.
- the drive train 125 may have a greater or a fewer number of these torque transmitting members.
- the drive train 125 can transmit torque from the motor 120 to the drill bit 62 (Fig. 1) using one or more threaded connections. These threaded connections may be used between the rotor 122, the universal joint (e.g. flex shaft) 126, and the drive shaft 128. In certain embodiments, the drive train 125 may also include a rotor adapter and bonnet (not shown) and a segmented drive shaft having upper and lower sections. Threaded connections may also be used transmit torque along these components as well. [0017] Referring to Fig. 3 A, the threaded connection may include a pin end 150 and a box end 152 (shown in hidden lines).
- the pin end 150 has external threads and the box end 152 has internal threads (not shown).
- the pin end 150 and the box end 152 have abutting shoulders 154, 156, respectively.
- an axial loading occurs at the shoulders 154, 156.
- the ratio between a shoulder load and a make-up torque (MUT) depends on thread geometry. If the transmitted torque is higher than MUT, then the connection becomes over-torqued resulting in shoulder or pin damage.
- the threaded connections of the drive train 125 may use a multi-start thread to reduce the induced shoulder load for a given torque. Reducing the shoulder load may increase the torque capacity of the connection and may therefore avoid the necessity of a double shouldering of a connection.
- An additional advantage is the faster make and break of long thread cylindrical connections like at the bonnet of a motor.
- a traditional thread which is a single start thread, has one helically wound thread.
- a multi start screw has two or more intertwined threads.
- the Fig. 3A thread embodiment has two intertwined threads, 158 and 159. The intertwined threads may be helically wound threads. In these screw configurations, the effective pitch is equal to the pitch of a standard thread multiplied by the number of starts.
- drill bit is only one illustrative consumer of rotary power.
- Other consumers include, but are not limited to, under-reamers, reamers, pipe cutting tools, etc.
- the number of thread starts may vary depending on application. Thus, the ratio between a make-up torque and a break out torque may also vary significantly.
- Fig. 3B shows an end view of a two-start thread that has intertwined threads, 158, 159.
- Fig. 4 show the end view of a three start threads having three intertwined threads, 160, 162, 164. While only up to three thread starts are shown, the number of thread starts may be even higher. The ultimate number of thread starts is reached for an infinite pitch resulting in a pure spline connection. For a relatively high number of thread starts (e.g., five or more depending on pitch and diameter), a potential loss of self locking capability may be addressed with supplemental locking features. Nevertheless, these relatively high thread starts may still be able to transmit bending loads and apply a pre-load (clamping force) on components.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/043,541 US20150093189A1 (en) | 2013-10-01 | 2013-10-01 | Multi-start thread connection for downhole tools |
PCT/US2014/058354 WO2015050880A1 (en) | 2013-10-01 | 2014-09-30 | Multi-start thread connection for downhole tools |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3052738A1 true EP3052738A1 (en) | 2016-08-10 |
EP3052738A4 EP3052738A4 (en) | 2017-06-21 |
Family
ID=52740335
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14850309.7A Withdrawn EP3052738A4 (en) | 2013-10-01 | 2014-09-30 | Multi-start thread connection for downhole tools |
Country Status (4)
Country | Link |
---|---|
US (1) | US20150093189A1 (en) |
EP (1) | EP3052738A4 (en) |
RU (1) | RU2016115587A (en) |
WO (1) | WO2015050880A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10731423B2 (en) | 2013-10-01 | 2020-08-04 | Baker Hughes, A Ge Company, Llc | Multi-start thread connection for downhole tools |
RU2725440C1 (en) * | 2016-11-28 | 2020-07-02 | Бейкер Хьюз, Э Джии Компани, Ллк | Multi-threaded connection for downhole tools |
CN110185385B (en) * | 2019-05-10 | 2024-01-12 | 吉林大学 | Double-drill hollow push-pull system for torque self-balancing drilling tool system |
CN112576182B (en) * | 2020-11-30 | 2022-04-12 | 中国石油天然气集团有限公司 | Wire passing motor drilling tool |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5090497A (en) * | 1990-07-30 | 1992-02-25 | Baker Hughes Incorporated | Flexible coupling for progressive cavity downhole drilling motor |
US5447472A (en) * | 1993-07-23 | 1995-09-05 | Ide; Russell D. | Articulated coupling for use with a progressive cavity apparatus |
CA2242592A1 (en) * | 1997-07-11 | 1999-01-11 | William D. Murray | Multiple lead threads for high torque transfer applications |
MXPA03000623A (en) * | 2000-07-21 | 2003-05-14 | Todd Andrew Haines | Couplings for rotary drill strings. |
US7303007B2 (en) * | 2005-10-07 | 2007-12-04 | Weatherford Canada Partnership | Method and apparatus for transmitting sensor response data and power through a mud motor |
CA2727382C (en) * | 2008-06-11 | 2016-12-20 | Keith A. Bullin | Downhole motor |
US8136846B2 (en) * | 2008-11-17 | 2012-03-20 | Gandy Technologies Corporation | Cylindrical tapered thread form for tubular connections |
US8899349B2 (en) * | 2011-07-22 | 2014-12-02 | Schlumberger Technology Corporation | Methods for determining formation strength of a wellbore |
-
2013
- 2013-10-01 US US14/043,541 patent/US20150093189A1/en not_active Abandoned
-
2014
- 2014-09-30 RU RU2016115587A patent/RU2016115587A/en not_active Application Discontinuation
- 2014-09-30 EP EP14850309.7A patent/EP3052738A4/en not_active Withdrawn
- 2014-09-30 WO PCT/US2014/058354 patent/WO2015050880A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
EP3052738A4 (en) | 2017-06-21 |
US20150093189A1 (en) | 2015-04-02 |
RU2016115587A (en) | 2017-11-10 |
WO2015050880A1 (en) | 2015-04-09 |
RU2016115587A3 (en) | 2018-05-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20160420 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
DAX | Request for extension of the european patent (deleted) | ||
A4 | Supplementary search report drawn up and despatched |
Effective date: 20170522 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: E21B 17/03 20060101ALI20170516BHEP Ipc: E21B 4/02 20060101ALI20170516BHEP Ipc: E21B 17/02 20060101AFI20170516BHEP Ipc: E21B 17/042 20060101ALI20170516BHEP |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20171220 |