EP2518257A1 - A tool string - Google Patents
A tool string Download PDFInfo
- Publication number
- EP2518257A1 EP2518257A1 EP11164298A EP11164298A EP2518257A1 EP 2518257 A1 EP2518257 A1 EP 2518257A1 EP 11164298 A EP11164298 A EP 11164298A EP 11164298 A EP11164298 A EP 11164298A EP 2518257 A1 EP2518257 A1 EP 2518257A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- string
- parts
- connecting element
- tool
- tool string
- 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- Withdrawn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
- 239000012530 fluid Substances 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000004891 communication Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 11
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000011499 joint compound Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B17/028—Electrical or electro-magnetic connections
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B17/18—Pipes provided with plural fluid passages
Definitions
- the present invention relates to a tool string for being suspended in a well, the tool string extending in a longitudinal direction and comprising a first string part and a second string part, each having a centre axis and comprising; an electrical connection in a first end, and a fluid channel extending at least partly through the string part, a connecting element rotatably connected to one string part and adapted to be threadably connected to a threaded portion of the other string part, to join the electrical connections of the first and second string parts.
- the present invention relates to a method for assembling two string parts of a tool string by rotating the connecting element to join electrical connections of the first and second string parts and to force a pipe connection of one string part into a hole in fluid communication with a fluid channel of the other string part.
- Tools deployed downhole in a well are often assembled or joined in a tool string comprising multiple tools, such as driving tools for driving the tool string forward in inclining sections of the well and/or operational tools for performing various operations downhole.
- Such pipe couplings may provide a fluid-tight coupling between pipe sections and may also comprise an electrical coupling for transferring electrical power.
- known couplings do not provide the necessary connections for connecting advanced tools and tool parts.
- Present downhole tools such as a downhole tractor, require a supply of both electrical power and hydraulic fluid in order to operate. A need has therefore arisen for a coupling between different tool sting parts wherein both fluid and electrical power can be transferred.
- Some downhole tool may require several separate fluid channels running between different parts of the tool string.
- the coupling has to be robust and capable of withstanding considerable tensile forces and twisting during deployment downhole. At the same time, the coupling has to be relatively easy and fast to assemble.
- a tool string for being suspended in a well the tool string extending in a longitudinal direction and comprising: a first string part and a second string part, each having a centre axis and comprising; an electrical connection in a first end, and a fluid channel extending at least partly through the string part.
- the tool string further comprising a connecting element rotatably connected to one string part and adapted to be threadably connected to a threaded portion of the other string part, to join the electrical connections of the first and second string parts; wherein one of the string parts comprises a pipe connection extending in the longitudinal direction from the first end and into the fluid channel of the other string part, when the string parts are mutually connected by the connecting element, the pipe connection being arranged eccentrically in relation to the centre axis for preventing mutual rotation of the string parts.
- connection for transferring both electrical power and fluid between two string parts of a tool string.
- the connection has the necessary rigidity to provide and maintain a fluid-tight seal between the fluid channels of the first and second string parts. Furthermore, the electrical wires are not twisted or bent.
- one of the string parts may comprise at least two pipe connections.
- one of the string parts may comprise a guide pin and the other string part may comprise a hole for receiving the guide pin, when the string parts are mutually connected by the connecting element.
- the connecting element may comprise two connectable collar elements adapted to be mutually connected around a section of one of the string parts.
- the connecting element may comprise an outer threaded portion.
- the connecting element may be arranged around a protrusion of one of the string parts having a reduced diameter compared to a maximum diameter of the string part.
- the connecting element may be arranged in a recess of one of the string parts, whereby the connecting element is prevented from substantially moving in the longitudinal direction.
- the connecting element may be prevented from substantially moving in the longitudinal direction towards the first end, by a protruding part of the string part having an increased outer diameter.
- Said connecting element may have an outer diameter being equal to or less than an outer diameter of the tool string.
- the connecting element may have an outer diameter being equal to or less than a minimum outer diameter of the tool string.
- the pipe connection may comprise a circumferential sealing element adapted to provide a fluid-tight seal between the pipe connection and the corresponding fluid channel into which it extends.
- one of the string parts may comprise a circumferential sealing element adapted to provide a fluid-tight seal between the first and second string parts.
- one of the string parts may be a driving unit for propelling the tool string in the well.
- the present invention furthermore relates to a method for assembling two string parts of a tool string, the method comprising the steps of:
- Fig. 1 shows a tool string 1 being suspended in a well 4 from a wire line 5.
- the tool string 1 may also be suspended using coiled tubing or by being part of a drill string.
- the shown well comprises a casing 6, but the tool string 1 may also be used in an uncased well.
- the tool string 1 extends in a longitudinal direction and comprises at least a first tool string part 2 and a second tool string part 3.
- a first end 200 of the first string part 2 and a first end 400 of the second string part 3 are connected via a connecting element 6 arranged between the two string parts 2, 3 in the longitudinal direction.
- the dotted lines in Fig. 1 illustrate how part of the first end 200 of the first string part extends through the connecting element 6 and into the first end 400 of the second string part.
- FIG. 2 a connection shown in Fig. 1 between the first string part 2 and the second string part 3 will be described in further detail below.
- the connecting element 6 and part of the second string part 3 has been cut through and are shown in a cross-sectional view.
- the string parts 2, 3 and the connecting element 6 each have a circular cross-section.
- the first string part 2 comprises a protrusion 27 having a reduced diameter 37b.
- the protrusion 27 extends between a face 39 of the first string part and a protrusion end face 201.
- the protrusion 27 comprises a circumferential projecting flange 29. Together with the face 39, the projecting flange 29 defines a recess 28 encircling the protrusion 27.
- a plurality of pipe connections 22, 23, 24 and a guide pin 26 extend.
- a plug 21 is provided in the end face 201 and a circumferential seal 33 is arranged around the protrusion 27 adjacent the end face 201.
- Each of the pipe connections extends in the longitudinal direction 10 from the end face 201 towards a tapered free end.
- a circumferential seal 30, 31 are arranged around each of the pipe connections.
- the guide pin 26 also extends in the longitudinal direction from the end face 201 towards a tapered free end.
- the connecting element 6 is provided in the recess 28.
- the connecting element 6 is comprised by two connectable collar elements 601, 602 as shown in Fig. 4 .
- the two collar elements 601, 602 are arranged in the recess 28 around the projection 27 and connected by bolts 62.
- the connecting element 6 is thereby rotatably connected to the first string part 2 and restricted from moving in the longitudinal direction by the face 39 and the projecting flange 29.
- the connecting element 6 comprises an outer threaded portion 61 adapted to be connected to a threaded portion 48 of the second string part 3, as shown in Fig. 2 . It is obvious to the person skilled in the art that the connecting element may be designed in a number of other ways without departing from the essence of the invention.
- the second string part 3 comprises a bore 47 adapted to receive the protrusion 27 of the first string part 2 and the connecting element 6.
- the bore is encircled by a threaded portion 48 of the second string part 3 adapted to be connected to the threaded portion 61 of the connecting element 6.
- the bore 47 is delimited by a face 401 comprising a plurality of holes 42, 43, 44 adapted to receive the pipe connections 22, 23, 24, as shown in Figs. 3a and 3b .
- the face 401 further comprises a hole 46 adapted to receive the guide pin 26, and a socket 41 adapted to be connected to the plug 21, as shown in Fig. 3a and Fig. 3b .
- FIG. 3a An approximated layout of the protruding pipe connections 22, 23, 24, guide pin 26 and plug 21 is shown in Fig. 3a , and a layout of the matching holes 42, 43, 44 and socket 41 is shown in Fig. 3b .
- the pipe connections 22, 23, 24 are fluidly connected to respective fluid channels 220, 240 in the first string part and the holes 42, 43, 44 are in fluid communication with respective fluid channels 420, 440 in the second string part 3.
- the fluid channels 220, 240 of the first string part is brought into fluid communication with the fluid channels of the second string part.
- the plug 21 and the socket 41 provide an electrical connection between the first and second string parts.
- the pipe connections 22, 23, 24 of the first string part 2 and the respective holes 42, 43, 44 in the second string part 4 are arranged eccentrically in relation to a centre axis 10.
- the first and second string parts 2, 3 are prevented from mutual rotation.
- the one or more pipe connections thus have the additional functionality of fixating the string parts in relation to one another, both during assembly of the string parts and use of the tool string downhole.
- the guide pin 26 extends further away from the end face 201 than the pipe connections. During assembly of the first and second string parts, the guide pin 26 is thus inserted into the hole 46 to control the assembly process and prevent damage caused by the string parts being rotated or angled in relation to one another. The plug and socket and the pipe connections may be bent or destroyed if the string parts are not arranged in parallel. When the guide pin 26 is at least partially arranged in the hole 46, the two string parts are kept substantially parallel relative to each other. By having a guide pin, the first and second string parts are prevented from tilting slightly in the connection therebetween.
- the pipe connections may be integral parts of one of the string parts or they may separate pipes.
- One pipe connection may be arranged in one string part and another pipe connection in the other, in order that when joining the string parts, the pipe connections function as guides during the assembly process.
- the connecting element 6 is arranged in the recess of the first string part and in Fig. 2 , the first string part 2 also comprises the pipe connection and the pin. However, the connecting element 6 may be arranged in the recess of the first string part, and the pipe connection and the pin may be arranged in the second string part 3.
- Fig. 5 shows a downhole tractor 81 being part of a tool string 1, wherein two string elements 2, 3 are assembled using the connecting element 6 described above.
- the downhole tractor is suspended from and powered through a wire line 5 connected with the downhole tractor through a top connector 71.
- the downhole tractor 81 comprises an electronics section 72, an electrical motor 73, a hydraulic pump 74 and two wheel sections 80 driven by hydraulics.
- the wheel sections are in fluid communication with the hydraulic pump 74 and may also be denoted as driving units 80 for propelling the downhole tractor and the tool string in the well.
- the downhole tractor may be connected to one or more operational downhole tools 75, also being part of the tool string 1.
- Such operational tools could be a stroker tool providing an axial force in one or more strokes, a key tool opening or closing valves in the well, positioning tools such as a casing collar locator (CCL), a milling tool, a drilling tool, etc.
- CCL casing collar locator
- connection between two string parts 2, 3, e.g. two wheel sections 80 of a downhole tractor may be used for transferring fluid(s) and/or electrical power. Electrical power may be transferred from the wire line 5 to the first string part and via the plug 21 and socket 41 to the subsequent string part.
- the pipe connection 22 may be used for connecting fluid channels providing a pressurised fluid from the hydraulic pump 74 to the wheel sections, for projecting, pivotally mounted wheel arms 76.
- the pipe connection 24 may be used for connecting fluid channels providing a pressurised fluid from the hydraulic pump 74 to the wheel sections, for rotating wheels 77 mounted at the wheel arms 76 in a clockwise direction.
- the pipe connection 23 may be used for connecting fluid channels providing a pressurised fluid from the hydraulic pump 74 to the wheel sections, for rotating wheels 77 mounted at the wheel arms 76 in a counterclockwise direction.
- the pipe connection 25 may be used for connecting fluid channels providing a return channel for fluid supplied to the wheel sections.
- fluid or well fluid any kind of fluid that may be present in oil or gas wells downhole, such as natural gas, oil, oil mud, crude oil, water, etc.
- gas is meant any kind of gas composition present in a well, completion, or open hole
- oil is meant any kind of oil composition, such as crude oil, an oil-containing fluid, etc.
- Gas, oil, and water fluids may thus all comprise other elements or substances than gas, oil, and/or water, respectively.
- a casing any kind of pipe, tubing, tubular, liner, string etc. used downhole in relation to oil or natural gas production.
- a downhole tractor can be used to push the tools all the way into position in the well.
- a downhole tractor is any kind of driving tool capable of pushing or pulling tools in a well downhole, such as a Well Tractor®.
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Catching Or Destruction (AREA)
- Workshop Equipment, Work Benches, Supports, Or Storage Means (AREA)
- Electric Cable Installation (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
Description
- The present invention relates to a tool string for being suspended in a well, the tool string extending in a longitudinal direction and comprising a first string part and a second string part, each having a centre axis and comprising; an electrical connection in a first end, and a fluid channel extending at least partly through the string part, a connecting element rotatably connected to one string part and adapted to be threadably connected to a threaded portion of the other string part, to join the electrical connections of the first and second string parts. Furthermore, the present invention relates to a method for assembling two string parts of a tool string by rotating the connecting element to join electrical connections of the first and second string parts and to force a pipe connection of one string part into a hole in fluid communication with a fluid channel of the other string part.
- The extraction rate from hydrocarbon-producing wells and the surrounding formations are becoming increasingly important due to decreasing oil reserves. Therefore, increasingly advanced tools are being developed and deployed in the search for and extraction of oil and gas. Tools deployed downhole in a well are often assembled or joined in a tool string comprising multiple tools, such as driving tools for driving the tool string forward in inclining sections of the well and/or operational tools for performing various operations downhole.
- Various principles for joining pipe sections for use in a drill string of a casing is known from the prior art. Such pipe couplings may provide a fluid-tight coupling between pipe sections and may also comprise an electrical coupling for transferring electrical power. However, known couplings do not provide the necessary connections for connecting advanced tools and tool parts. Present downhole tools, such as a downhole tractor, require a supply of both electrical power and hydraulic fluid in order to operate. A need has therefore arisen for a coupling between different tool sting parts wherein both fluid and electrical power can be transferred. Some downhole tool may require several separate fluid channels running between different parts of the tool string. The coupling has to be robust and capable of withstanding considerable tensile forces and twisting during deployment downhole. At the same time, the coupling has to be relatively easy and fast to assemble.
- It is an object of the present invention to wholly or partly overcome the above disadvantages and drawbacks of the prior art. More specifically, it is an object to provide an improved tool string wherein electrical power and fluid(s) can be transferred from one part of the tool string to another. Further, it is an object to provide a connection between two string parts, wherein fluid channels in each of the string parts are brought into fluid communication and wiring in each of the string parts are connected.
- The above objects, together with numerous other objects, advantages, and features, which will become evident from the below description, are accomplished by a solution in accordance with the present invention by a tool string for being suspended in a well, the tool string extending in a longitudinal direction and comprising: a first string part and a second string part, each having a centre axis and comprising; an electrical connection in a first end, and a fluid channel extending at least partly through the string part. The tool string further comprising a connecting element rotatably connected to one string part and adapted to be threadably connected to a threaded portion of the other string part, to join the electrical connections of the first and second string parts; wherein one of the string parts comprises a pipe connection extending in the longitudinal direction from the first end and into the fluid channel of the other string part, when the string parts are mutually connected by the connecting element, the pipe connection being arranged eccentrically in relation to the centre axis for preventing mutual rotation of the string parts.
- Hereby, a connection for transferring both electrical power and fluid between two string parts of a tool string may be provided. The connection has the necessary rigidity to provide and maintain a fluid-tight seal between the fluid channels of the first and second string parts. Furthermore, the electrical wires are not twisted or bent.
- In one embodiment, one of the string parts may comprise at least two pipe connections.
- In another embodiment, one of the string parts may comprise a guide pin and the other string part may comprise a hole for receiving the guide pin, when the string parts are mutually connected by the connecting element.
- Further, the connecting element may comprise two connectable collar elements adapted to be mutually connected around a section of one of the string parts.
- Moreover, the connecting element may comprise an outer threaded portion.
- Also, the connecting element may be arranged around a protrusion of one of the string parts having a reduced diameter compared to a maximum diameter of the string part.
- Additionally, the connecting element may be arranged in a recess of one of the string parts, whereby the connecting element is prevented from substantially moving in the longitudinal direction.
- Furthermore, the connecting element may be prevented from substantially moving in the longitudinal direction towards the first end, by a protruding part of the string part having an increased outer diameter.
- Said connecting element may have an outer diameter being equal to or less than an outer diameter of the tool string.
- Also, the connecting element may have an outer diameter being equal to or less than a minimum outer diameter of the tool string.
- In one embodiment, the pipe connection may comprise a circumferential sealing element adapted to provide a fluid-tight seal between the pipe connection and the corresponding fluid channel into which it extends.
- In addition, one of the string parts may comprise a circumferential sealing element adapted to provide a fluid-tight seal between the first and second string parts.
- In one embodiment, one of the string parts may be a driving unit for propelling the tool string in the well.
- The present invention furthermore relates to a method for assembling two string parts of a tool string, the method comprising the steps of:
- moving a first end of a first string part towards a first end of a second string pa rt,
- arranging a guide pin of one of the string parts in a hole in another string part,
- connecting a threaded portion of a connecting element rotatably connected to one of the string parts, with a threaded portion of the other string part.
- rotating the connecting element to join electrical connections of the first and second string parts and to force a pipe connection of one string part into a hole in fluid communication with a fluid channel of the other string part.
- The invention and its many advantages will be described in more detail below with reference to the accompanying schematic drawings, which for the purpose of illustration show some non-limiting embodiments and in which
-
Fig. 1 shows a tool string being suspended in a well, -
Fig. 2 shows the ends of two string parts in an assembled state being connected by a connecting element, -
Figs. 3a and 3b show a layout of the end faces of two string parts adapted to be assembled, -
Fig. 4 shows a connecting element comprising two connectable collar elements, -
Fig. 5 shows a tool string comprising a downhole tractor having wheel sections. - All the figures are highly schematic and not necessarily to scale, and they show only those parts which are necessary in order to elucidate the invention, other parts being omitted or merely suggested.
-
Fig. 1 shows atool string 1 being suspended in awell 4 from awire line 5. Thetool string 1 may also be suspended using coiled tubing or by being part of a drill string. The shown well comprises acasing 6, but thetool string 1 may also be used in an uncased well. - The
tool string 1 extends in a longitudinal direction and comprises at least a firsttool string part 2 and a secondtool string part 3. Afirst end 200 of thefirst string part 2 and afirst end 400 of thesecond string part 3 are connected via a connectingelement 6 arranged between the twostring parts Fig. 1 illustrate how part of thefirst end 200 of the first string part extends through the connectingelement 6 and into thefirst end 400 of the second string part. - Referring to
Fig. 2 , a connection shown inFig. 1 between thefirst string part 2 and thesecond string part 3 will be described in further detail below. For the purpose of clarity, the connectingelement 6 and part of thesecond string part 3 has been cut through and are shown in a cross-sectional view. - The
string parts connecting element 6 each have a circular cross-section. In thefirst end 200, thefirst string part 2 comprises aprotrusion 27 having a reduceddiameter 37b. Theprotrusion 27 extends between a face 39 of the first string part and aprotrusion end face 201. Towards theend face 201, theprotrusion 27 comprises acircumferential projecting flange 29. Together with the face 39, the projectingflange 29 defines arecess 28 encircling theprotrusion 27. At theend face 201, a plurality ofpipe connections guide pin 26 extend. Further, aplug 21 is provided in theend face 201 and acircumferential seal 33 is arranged around theprotrusion 27 adjacent theend face 201. Each of the pipe connections extends in thelongitudinal direction 10 from theend face 201 towards a tapered free end. At a distance from the tapered end, acircumferential seal guide pin 26 also extends in the longitudinal direction from theend face 201 towards a tapered free end. Around theprotrusion 27 having a recess of reduced diameter, the connectingelement 6 is provided in therecess 28. The connectingelement 6 is comprised by twoconnectable collar elements Fig. 4 . During assembly, the twocollar elements recess 28 around theprojection 27 and connected bybolts 62. The connectingelement 6 is thereby rotatably connected to thefirst string part 2 and restricted from moving in the longitudinal direction by the face 39 and the projectingflange 29. The connectingelement 6 comprises an outer threadedportion 61 adapted to be connected to a threadedportion 48 of thesecond string part 3, as shown inFig. 2 . It is obvious to the person skilled in the art that the connecting element may be designed in a number of other ways without departing from the essence of the invention. - In the
first end 400, thesecond string part 3 comprises abore 47 adapted to receive theprotrusion 27 of thefirst string part 2 and the connectingelement 6. The bore is encircled by a threadedportion 48 of thesecond string part 3 adapted to be connected to the threadedportion 61 of the connectingelement 6. At one end, thebore 47 is delimited by aface 401 comprising a plurality ofholes pipe connections Figs. 3a and 3b . Theface 401 further comprises ahole 46 adapted to receive theguide pin 26, and asocket 41 adapted to be connected to theplug 21, as shown inFig. 3a and Fig. 3b . - An approximated layout of the protruding
pipe connections guide pin 26 and plug 21 is shown inFig. 3a , and a layout of the matching holes 42, 43, 44 andsocket 41 is shown inFig. 3b . Thepipe connections fluid channels holes fluid channels second string part 3. By arranging thepipe connections respective holes fluid channels plug 21 and thesocket 41 provide an electrical connection between the first and second string parts. - As shown in
Figs. 3a and 3b , thepipe connections first string part 2 and therespective holes second string part 4 are arranged eccentrically in relation to acentre axis 10. By at least onepipe connection second string parts - The
guide pin 26 extends further away from theend face 201 than the pipe connections. During assembly of the first and second string parts, theguide pin 26 is thus inserted into thehole 46 to control the assembly process and prevent damage caused by the string parts being rotated or angled in relation to one another. The plug and socket and the pipe connections may be bent or destroyed if the string parts are not arranged in parallel. When theguide pin 26 is at least partially arranged in thehole 46, the two string parts are kept substantially parallel relative to each other. By having a guide pin, the first and second string parts are prevented from tilting slightly in the connection therebetween. Such slight tilting in the connection itself may result in the pipe connections leaking, either because the pipe connection being an integral part of the one end of the string parts has been bent and thus slightly separated, forming a fracture, or the pipe connection as a separate part has tilted in the holes. - The pipe connections may be integral parts of one of the string parts or they may separate pipes. One pipe connection may be arranged in one string part and another pipe connection in the other, in order that when joining the string parts, the pipe connections function as guides during the assembly process.
- The connecting
element 6 is arranged in the recess of the first string part and inFig. 2 , thefirst string part 2 also comprises the pipe connection and the pin. However, the connectingelement 6 may be arranged in the recess of the first string part, and the pipe connection and the pin may be arranged in thesecond string part 3. -
Fig. 5 shows adownhole tractor 81 being part of atool string 1, wherein twostring elements element 6 described above. The downhole tractor is suspended from and powered through awire line 5 connected with the downhole tractor through atop connector 71. Thedownhole tractor 81 comprises anelectronics section 72, anelectrical motor 73, ahydraulic pump 74 and twowheel sections 80 driven by hydraulics. The wheel sections are in fluid communication with thehydraulic pump 74 and may also be denoted as drivingunits 80 for propelling the downhole tractor and the tool string in the well. The downhole tractor may be connected to one or more operationaldownhole tools 75, also being part of thetool string 1. Such operational tools could be a stroker tool providing an axial force in one or more strokes, a key tool opening or closing valves in the well, positioning tools such as a casing collar locator (CCL), a milling tool, a drilling tool, etc. - The connection between two
string parts wheel sections 80 of a downhole tractor, may be used for transferring fluid(s) and/or electrical power. Electrical power may be transferred from thewire line 5 to the first string part and via theplug 21 andsocket 41 to the subsequent string part. Thepipe connection 22 may be used for connecting fluid channels providing a pressurised fluid from thehydraulic pump 74 to the wheel sections, for projecting, pivotally mountedwheel arms 76. Thepipe connection 24 may be used for connecting fluid channels providing a pressurised fluid from thehydraulic pump 74 to the wheel sections, for rotatingwheels 77 mounted at thewheel arms 76 in a clockwise direction. Thepipe connection 23 may be used for connecting fluid channels providing a pressurised fluid from thehydraulic pump 74 to the wheel sections, for rotatingwheels 77 mounted at thewheel arms 76 in a counterclockwise direction. Thepipe connection 25 may be used for connecting fluid channels providing a return channel for fluid supplied to the wheel sections. - By fluid or well fluid is meant any kind of fluid that may be present in oil or gas wells downhole, such as natural gas, oil, oil mud, crude oil, water, etc. By gas is meant any kind of gas composition present in a well, completion, or open hole, and by oil is meant any kind of oil composition, such as crude oil, an oil-containing fluid, etc. Gas, oil, and water fluids may thus all comprise other elements or substances than gas, oil, and/or water, respectively.
- By a casing is meant any kind of pipe, tubing, tubular, liner, string etc. used downhole in relation to oil or natural gas production.
- In the event that the tools are not submergible all the way into the casing, a downhole tractor can be used to push the tools all the way into position in the well. A downhole tractor is any kind of driving tool capable of pushing or pulling tools in a well downhole, such as a Well Tractor®.
- Although the invention has been described in the above in connection with preferred embodiments of the invention, it will be evident for a person skilled in the art that several modifications are conceivable without departing from the invention as defined by the following claims.
Claims (13)
- A tool string (1) for being suspended in a well (4), the tool string extending in a longitudinal direction and comprising:- a first string part (2) and a second string part (3), each having a centre axis (10) and comprising;- an electrical connection (21, 41) in a first end (200, 400), and- a fluid channel (220, 240, 420, 440) extending at least partly through the string part,- a connecting element (6) rotatably connected to one string part and adapted to be threadably connected to a threaded portion (48) of the other string part, to join the electrical connections of the first and second string parts; wherein one of the string parts comprises a pipe connection (22, 23, 24) extending in the longitudinal direction from the first end and into the fluid channel of the other string part, when the string parts are mutually connected by the connecting element, the pipe connection being arranged eccentrically in relation to the centre axis for preventing mutual rotation of the string parts.
- A tool string according to claim 1, wherein one of the string parts comprises at least two pipe connections (22, 23, 24).
- A tool string according to claim 1 or 2, wherein one of the string parts comprises a guide pin (26) and the other string part comprises a hole (46) for receiving the guide pin, when the string parts are mutually connected by the connecting element.
- A tool string according to any of the preceding claims, wherein the connecting element comprises two connectable collar elements (601, 602) adapted to be mutually connected around a section (27) of one of the string pa rts.
- A tool string according to any of the preceding claims, wherein the connecting element comprises an outer threaded portion (61).
- A tool string according to any of the preceding claims, wherein the connecting element is arranged around a protrusion (27) of one of the string parts having a reduced diameter (37b) compared to a maximum diameter of the string part.
- A tool string according to any of the preceding claims, wherein the connecting element is arranged in a recess (28) of one of the string parts, whereby the connecting element is prevented from substantially moving in the longitudinal direction.
- A tool string according to any of the preceding claims, wherein the connecting element is prevented from substantially moving in the longitudinal direction towards the first end, by a protruding part (29) of the string part having an increased outer diameter.
- A tool string according to any of the preceding claims, wherein the connecting element has an outer diameter (66) being equal to or less than an outer diameter (37a) of the tool string.
- A tool string according to any of the preceding claims, wherein the pipe connection comprises a circumferential sealing element (30, 31) adapted to provide a fluid-tight seal between the pipe connection and the corresponding fluid channel (420, 440) into which it extends.
- A tool string according to any of the preceding claims, wherein one of the string parts comprises a circumferential sealing element (33) adapted to provide a fluid-tight seal between the first and second string parts.
- A tool string according to any of the preceding claims, wherein one of the string parts is a driving unit (80) for propelling the tool string in the well.
- Method for assembling two string parts (2, 4) of a tool string (1), the method comprising the steps of:- moving a first end (200) of a first string part (2) towards a first end (400) of a second string part (4),- arranging a guide pin (26) of one of the string parts in a hole (46) in another string part,- connecting a threaded portion (61) of a connecting element (6) rotatably connected to one of the string parts, with a threaded portion (48) of the other string part.- rotating the connecting element to join electrical connections of the first and second string parts and to force a pipe connection (22, 23, 24) of one string part into a hole (42, 43, 44) in fluid communication with a fluid channel (420, 440) of the other string part.
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11164298A EP2518257A1 (en) | 2011-04-29 | 2011-04-29 | A tool string |
BR112013027370A BR112013027370A2 (en) | 2011-04-29 | 2012-04-27 | tool column |
RU2013152080/03A RU2591863C2 (en) | 2011-04-29 | 2012-04-27 | Tool column |
MYPI2013003844A MY166745A (en) | 2011-04-29 | 2012-04-27 | A tool string |
MX2013012437A MX336468B (en) | 2011-04-29 | 2012-04-27 | A tool string. |
PCT/EP2012/057802 WO2012146732A1 (en) | 2011-04-29 | 2012-04-27 | A tool string |
US14/114,629 US20140076582A1 (en) | 2011-04-29 | 2012-04-27 | Tool string |
CN201280021013.6A CN103502559A (en) | 2011-04-29 | 2012-04-27 | A tool string |
CA2834476A CA2834476A1 (en) | 2011-04-29 | 2012-04-27 | A tool string |
AU2012247463A AU2012247463B2 (en) | 2011-04-29 | 2012-04-27 | A tool string |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11164298A EP2518257A1 (en) | 2011-04-29 | 2011-04-29 | A tool string |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2518257A1 true EP2518257A1 (en) | 2012-10-31 |
Family
ID=44454758
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11164298A Withdrawn EP2518257A1 (en) | 2011-04-29 | 2011-04-29 | A tool string |
Country Status (10)
Country | Link |
---|---|
US (1) | US20140076582A1 (en) |
EP (1) | EP2518257A1 (en) |
CN (1) | CN103502559A (en) |
AU (1) | AU2012247463B2 (en) |
BR (1) | BR112013027370A2 (en) |
CA (1) | CA2834476A1 (en) |
MX (1) | MX336468B (en) |
MY (1) | MY166745A (en) |
RU (1) | RU2591863C2 (en) |
WO (1) | WO2012146732A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111630245B (en) * | 2018-02-02 | 2022-04-12 | 海德里美国分销有限责任公司 | System and method for threaded riser auxiliary line |
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US20090229817A1 (en) * | 2005-06-15 | 2009-09-17 | Ashers Partouche | Modular connector and method |
WO2010122342A1 (en) * | 2009-04-22 | 2010-10-28 | Artificial Lift Company Limited | Electrical wet connector in downhole environment |
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US4583804A (en) * | 1984-05-21 | 1986-04-22 | Richard Thompson | Electric feedthrough system |
US4616855A (en) * | 1984-10-29 | 1986-10-14 | Ruhle James L | Threadless nonrotating steel coupling system |
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US4723230A (en) * | 1986-08-13 | 1988-02-02 | Bolt Technology Corporation | High ambient liquid pressure-resistant electrical connector |
US5051103A (en) * | 1990-10-09 | 1991-09-24 | Hubbell Incorporated | Electrical coupling assembly for hot, high pressure service |
US5286220A (en) * | 1991-11-18 | 1994-02-15 | Camco International, Inc. | Electrical cable connector |
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US6666274B2 (en) * | 2002-05-15 | 2003-12-23 | Sunstone Corporation | Tubing containing electrical wiring insert |
US7549849B2 (en) * | 2005-02-23 | 2009-06-23 | Schlumberger Technology Corporation | Tandem motors |
US7726396B2 (en) * | 2007-07-27 | 2010-06-01 | Schlumberger Technology Corporation | Field joint for a downhole tool |
-
2011
- 2011-04-29 EP EP11164298A patent/EP2518257A1/en not_active Withdrawn
-
2012
- 2012-04-27 RU RU2013152080/03A patent/RU2591863C2/en not_active IP Right Cessation
- 2012-04-27 MX MX2013012437A patent/MX336468B/en unknown
- 2012-04-27 BR BR112013027370A patent/BR112013027370A2/en not_active IP Right Cessation
- 2012-04-27 CA CA2834476A patent/CA2834476A1/en not_active Abandoned
- 2012-04-27 WO PCT/EP2012/057802 patent/WO2012146732A1/en active Application Filing
- 2012-04-27 US US14/114,629 patent/US20140076582A1/en not_active Abandoned
- 2012-04-27 AU AU2012247463A patent/AU2012247463B2/en not_active Ceased
- 2012-04-27 MY MYPI2013003844A patent/MY166745A/en unknown
- 2012-04-27 CN CN201280021013.6A patent/CN103502559A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070275585A1 (en) * | 2003-10-09 | 2007-11-29 | Neil Griffiths | Method for Interconnecting Electrical Conduits in a Borehole |
US20090229817A1 (en) * | 2005-06-15 | 2009-09-17 | Ashers Partouche | Modular connector and method |
US20090195250A1 (en) * | 2006-06-09 | 2009-08-06 | Halliburton Energy Services, Inc. | Measurement while drilling tool with interconnect assembly |
WO2010122342A1 (en) * | 2009-04-22 | 2010-10-28 | Artificial Lift Company Limited | Electrical wet connector in downhole environment |
Also Published As
Publication number | Publication date |
---|---|
CA2834476A1 (en) | 2012-11-01 |
WO2012146732A1 (en) | 2012-11-01 |
CN103502559A (en) | 2014-01-08 |
AU2012247463A1 (en) | 2013-05-02 |
RU2591863C2 (en) | 2016-07-20 |
MX336468B (en) | 2016-01-20 |
RU2013152080A (en) | 2015-06-10 |
BR112013027370A2 (en) | 2017-01-17 |
AU2012247463B2 (en) | 2015-03-12 |
US20140076582A1 (en) | 2014-03-20 |
MY166745A (en) | 2018-07-20 |
MX2013012437A (en) | 2013-12-02 |
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