FR2892175A1 - Traction unit for use in oil or gas pipelines has pair of levers mounted on body of unit which are connected at their outer ends by pivot, on which wheel is mounted which can run along pipe wall - Google Patents

Abstract

The traction unit for use in oil or gas pipelines has pairs of wheels (56a, 56B), at least one of which consists of drive wheels. A pair of levers (80, 94) are mounted on the body of the unit and are connected at their outer ends by a pivot (90), on which a wheel (82) is mounted which can run along the pipe wall. Independent claims are included for: (A) pipeline shuttles fitted with the unit; and (B) a method for driving pipeline shuttles using the unit.

Description

The present invention relates to a bottom pull module intended for

  being lowered into a duct of a fluid operating installation, the traction module being of the type comprising: a body extending along a longitudinal axis; at least one drive train comprising at least one drive wheel connected to the body for moving the traction module in the conduit; - Deployable means for applying the or each drive wheel against a wall of the conduit, the application means being arranged substantially opposite the or each drive train and comprising: - at least one arm deployable radially relative to the body between a retracted position and an extended position; a rolling member mounted at a free end of the or each arm; and means for biasing the or each arm towards its deployed position. Such tensile modules are used in particular to deploy and to bring to the surface bottom tools in oil wells having substantially horizontal sections or slightly inclined relative to the horizontal. A traction module of the aforementioned type (for example MULETM from the company SONDEX) is known which is incorporated in a shuttle lowered into the bottom of a well by means of a working line to the cable. The traction module of the aforementioned type comprises two drive trains which each comprise two drive wheels. The drive trains are mounted symmetrically on either side of a tubular body. The drive wheels are deployable radially relative to the body to be applied against the walls of the conduit. In the vertical portions of the well, the shuttle descended by gravity using the cable working line. When the shuttle reaches a slightly inclined or substantially horizontal section, its weight no longer allows to exert sufficient force to move it towards the bottom of the well. In this case, the operator of the shuttle deploys the drive wheels symmetrically on either side of the body of the shuttle. Each driving wheel is thus applied to the wall of the conduit and centers the shuttle relative to this wall. The drive wheels are then activated to propel the shuttle to the bottom of the well.

  Such a traction module does not give complete satisfaction. Since the wheels can be deployed radially with respect to the body in order to adapt to ducts of different sections, it is necessary to provide transmission means between the drive wheels and the wheel drive motor if it is housed in the body. . Another possibility is to deport the drive motor at the end of the radial deployment means of the wheels. As a result, the traction module of the aforementioned type is complex to achieve, expensive and unreliable. It is an object of the invention to provide a bottom pull module for propelling a downhole tool in a conduit of a fluid operating system which is simple to make, inexpensive and more reliable. For this purpose, the invention relates to a traction module of the aforementioned type, characterized in that the or each rolling member is mounted crazy at the free end of the arm.

  The traction module according to the invention may comprise one or more of the following characteristics, taken separately or in any technically possible combination. - The radial position of the or each rolling member is changeable independently of the radial position of the or each drive wheel relative to the longitudinal axis; - the or each drive wheel defines a cylindrical space extending along an axis of rotation of the wheel, at least a portion of the body being located in the cylindrical space regardless of the position of the arm; the or each drive wheel is rotatably mounted in the body, in a generally invariant position relative to the body; the biasing means comprise an arm deployment jack and quick-release means for the jack to retract the deployable arm; the application means comprise a triangle of articulation of the arm, deployable relative to the body, a vertex of the triangle being fixed relative to the body; - The or each drive wheel comprises a flange and a tread inclined outwardly relative to the flange; - It comprises at least two coaxial drive wheels disposed on either side of the body, the arm extending substantially in a plane perpendicular to the axis of the wheels; it comprises at least two drive trains axially spaced along the longitudinal axis, a rolling member being disposed between the two axially spaced trains, substantially in a median plane with respect to the two drive trains; drive train comprises a wheel drive motor; and - it comprises means for selective release of the or each driving wheel, to pass the or each drive wheel from an active drive configuration of the traction module to The invention further relates to a shuttle, characterized in that it comprises: a traction module as defined above; connecting to a line of work with the cable, the connection means being fixed on the traction module and comprising means for measuring the mechanical tension applied on the line; and - a tool of fo nd integral with the traction module. The shuttle according to the invention can comprise the following characteristic: it comprises two traction modules and an articulation hinge of the two traction modules, the longitudinal axes and the two traction modules being able to be radially spaced relative to one another; the other using the attellage.

  The subject of the invention is furthermore a method of pulling a shuttle as defined above, characterized in that it comprises the following steps: activation of a first traction module at a useful power equal to one first fraction of its nominal power; simultaneous activation of a second traction module at a second fraction of the nominal power of the first traction module, the sum of the first fraction and the second fraction being substantially equal to or greater than the nominal power of one of said modules; traction. The method according to the invention may comprise one or more of the following characteristics, taken separately or in any technically possible combination. the first fraction is greater than 0.7 and the second fraction is less than 0.3; and the sum of the first fraction and the second fraction is greater than the nominal power. The invention will be better understood on reading the description which follows, given solely by way of example, and with reference to the appended drawings, in which: FIG. 1 is a diagrammatic sectional view along a median vertical plane; an oil well comprising a substantially horizontal section in which a first shuttle according to the invention circulates; FIG. 2 is an enlarged view of a detail marked II in FIG. 1; - Figure 3 is a cross-sectional view along the vertical plane III-III of Figure 2; FIG. 4 is a schematic view of the drive motor drive means of the traction module shown in FIG. 2; Figure 5 is a schematic view of the hydraulic circuit of the traction module shown in Figure 2; - Figure 6 is a view similar to Figure 3, during the passage of the shuttle in a section of the well of reduced diameter; - Figure 7A is a schematic view similar to Figure 2 of a second shuttle according to the invention in normal operation; and - Figure 7B is a view similar to Figure 7A in degraded operation.

  In all that follows, the proximal term means relatively closer or oriented towards the surface of the soil, while the term distal means relatively closer or oriented towards the bottom of a well made in the soil. The first shuttle 10 according to the invention, shown in Figures 1 to 6 is intended to be lowered into the bottom of an oil well 12 using means 14 for deployment to the cable. As illustrated in FIG. 1, the well 12 comprises a first duct 16 called a casing formed in the subsoil 18 and a second duct 20 called production casing set substantially in the center of the first duct 16. The well 12 also comprises a head well 22 which selectively closes the first duct 16 and the second duct 20. The first duct 16 comprises, moving from the surface towards the bottom of the well 12, an upper section 24 substantially vertical, an elbow section 26 of increasing inclination relative to the vertical axis XX 'of the first section 24, and a substantially horizontal lower section 28. In the example illustrated in FIG. 1, the second duct 20 also comprises a vertical upper section and an angled intermediate section. The second conduit 20 is of shorter length than that of the first conduit 16. It opens into the lower section 28 of the first conduit 16. The deployment means 14 of the shuttle comprise a cable working line 30, a surface winch 32 enabling the deployment or retraction of the line 30 in the well 12 and the guide pulleys 34 of the line 30 mounted on the wellhead 22. The line 30 is for example formed by a mechanically reinforced electric cable, commonly referred to by the term english electric line.

  This line 30 simultaneously ensures the mechanical deployment of the shuttle 10 in the well 12 and its power supply. As a variant, the line 30 is formed by a smooth single-stranded cable designated by the English term slickline, or an electrically insulated single-stranded smooth cable of the type described in application FR-A-2 848 363, or a substantially rigid hollow tube designated by the English term coiled tubing. Line 30 may then be devoid of power transmission means, in which case the shuttle 10 is equipped with batteries for its power supply.

  The winch 32 and the pulleys 34 allow the deployment of the working line 30 successively in the second conduit 20, then in the first conduit 16 through the wellhead 22. As shown in Figure 2, the shuttle 10 comprises, between a distal end directed towards the surface (on the right in the Figure) and a proximal end directed towards the bottom of the well 12 (on the left in the Figure), a module 36 for connection to the line 30, a traction module 38 according to the invention and a downhole tool 40. The connection module 36 comprises means for mechanical and electrical connection between the line 30 and the assembly formed by the traction module 38 and the tool 40. It further comprises means 41 measuring the mechanical voltage applied on the line 30 at the connection module. The measuring means 41 are connected to the winch 32 by data transmission means 41A for controlling the deployment of the line 30 to the voltage measured by the measuring means 41.

  The downhole tool 40 comprises for example a series of sensors for establishing a log commonly referred to as the English log, or at least one intervention member. The traction module 38 comprises a substantially tubular body 42 of longitudinal axis YY ', a pair of drive trains 44A, 44B carried by the body 42, means 46 for applying each drive train 44A, 44B against a wall 48 of the duct 16, arranged opposite the drive trains 44A, 44B, and means 49 for guiding the traction module 38 normally deployed when the shuttle 10 is moved in the conduit 12 under the sole action of the line 30 and gravity. The body 42 has an elongated shape along the longitudinal axis Y-Y '. In the example shown in FIG. 2, the axis YY 'is radially offset with respect to the median longitudinal axis ZZ' of the section 28. The drive trains 44A, 44B are spaced axially along the Y axis -Y. They have substantially identical structures. The proximal drive train 44B and the distal drive train 44A are symmetrical about a transverse plane Po. In what follows, only the distal drive train 44A will be described. The drive train 44A comprises an electric drive motor 50A, mechanical transmission means 52A, an axle 54A rotatably mounted in the body 42 and two wheels 56A integral with the axle 54A which extend in planes parallel to the a vertical median plane of the body 42, on either side of the body 42. The motor 50A is disposed in the body 42, between the tool 40 and the wheels 56A. It is electrically connected to the work line to the cable 30 for its electrical power supply via a control module 51. As illustrated in Figure 4, it comprises an output shaft 58A connected to the transmission means 52A. The control module 51 is electrically connected to the surface, and the measuring means 41 of the voltage. The transmission means 52A are also arranged in the body, between the motor 50A and the wheels 56A. They comprise a speed reducer 60A, coupled to the output shaft 58A and to the axle 54A. The gearbox 60A reduces the rotational speed of the axle 54A, relative to that of the output shaft 58A. It comprises, for example, an epicyclic or hypocycloidal gear train associated with a conical torque or a wheel and screw mechanism.

  The axle 54A is rotatably mounted in the body 42 substantially along a horizontal axis transverse to the longitudinal axis YY '.

  The wheels 56A are attached to the lateral ends of the axle 54A. The position of the wheels 56A is globally invariant with respect to the body 42. As illustrated in FIG. 3, each wheel 56A comprises a substantially flat flange 70A and a tread 72A projecting from the outside of the flange 70. The wheel 56A thus presents a substantially C-shaped cross-section. The flange 70A is substantially in a vertical plane and is applied to a substantially vertical outer surface of the body 42.

  Thus, each wheel 56A defines a cylindrical space extending along the axis of the axle 54A, wherein at least a portion of the body 42 is received. The tread 72A has a toothed free end surface 74A applied to the wall 48 of the section 28. The angle of inclination of the tread 72A relative to the plane of the flange 70A is for example between 30 and 60 to increase the contact pressure by corner effect. The surface 74A is curved to ensure the wedge effect regardless of the curvature of the conduit. With reference to FIG. 2, the application means 46 comprise an arm 80 deployable radially with respect to the body 42, a pressure roller 82 mounted loosely at the free end of the arm 80, a rod 84 for deploying the arm 80 and a hydraulic jack 86 actuating the rod 84 to deploy the arm 80. The arm 80 is articulated to the body 42 by a first point of articulation 88 about a pivot substantially parallel to the axis of the wheels 44A, 44B. It is also articulated to the connecting rod 84 and the roller 82 by a second point 90 located at its free end around a pivot axis parallel to the axis of the wheels 44A, 44B. The first pivot point 88 is axially fixed relative to the body 42. The first point 88 is situated in the proximal part of the body 42 located between the wheel 54B of the second train 54B and the connection module 36.

  The second point 90 is located longitudinally between the wheels 56A, 56B of the first and second drive trains 44A, 44B. The roller 82 is mounted idle, that is to say free to rotate about an axis parallel to that of the wheels 44A, 44B.

  The rod 84 is connected to the jack 86 by a third articulation point 92 guided in translation along a longitudinal axis in the body 42. The arm 80 and the connecting rod 84 thus form a deployable articulation triangle 94 whose vertices are formed by the first, second and third hinge points 88, 90, 92.

  The triangle 94 is deployable between a flattened position in which the roller 90, the rod 84 and the arm 80 are retracted into the body 42, and an extended position shown in Figure 2, in which the arm 80 and the connecting rod 84 protrude 42. In the extended position, the roller 82 is held in abutment against the wall 48 opposite the point of contact of the wheels 44A, 44B on the wall 48 with respect to a median horizontal plane in FIG. In this position, the roller 82 is located between the two drive trains 44A, 44B, substantially in the plane Po. Furthermore, as illustrated in FIG. 3, the articulation triangle 94 and the roller 82 are located above wheels 56A, 56B in a median vertical plane extending between the wheels 56A and 56B of each drive train 44A, 44B. As shown in FIGS. 2 and 5, the jack 86 comprises a rod 96 for actuating the connecting rod 84 and a hydraulic actuator 98.

  The actuator 98 comprises a pressurizing chamber 100 which receives the rod 96, a discharge tank 102, a hydraulic electro-pump 104 and a pipe 106 for selectively pressurizing the chamber 100, connecting the electropump. 104 to the chamber 100. The actuator further comprises two hydraulic cylinders 105A, 105B for controlling the guide means, supplied with hydraulic fluid via the pipe 106.

  The rod 96 comprises a control end 105 received in the chamber 100 and a hinge free end to the connecting rod 84 forming the third hinge point 92. The rod 96 is guided in translation along an axis parallel to the 'YY axis' between a retracted position in the chamber 100, in which the triangle 94 is flattened and an advanced position of actuation of the rod 84, in which the triangle 94 is deployed. The chamber 100 receives a return spring 108 of the rod 96 to its retracted position, bearing between the end 105 and a wall defining the chamber through which the rod 96 is engaged. The electric pump 104 connects the tank 102 to an inlet of the pipe 106. The pipe 106 comprises, upstream to downstream from the electropump 104 to the chamber 100, a zero leakage check valve 110, a discharge pipe 112, a pressure switch 114, a pressure relief valve 116 and an accumulator 118. The discharge pipe 112 is stitched on the pipe 106. This pipe 112 is provided with a normally open pilot-operated solenoid valve 120 which opens into the the tarpaulin 102.

  As illustrated in FIG. 2, the guiding means 49 of the traction module comprise at least two pairs of centralizers 130 normally deployed during descent into the well, arranged respectively proximally with respect to the second drive train 44B and distally relative to at the first drive train 44A. Each pair comprises two centrers 130 radially opposed. Each centering device 130 comprises a hinged linkage 131 radially expandable, and a free wheel 132 carried by the linkage 131. Springs (not shown) maintain at rest each linkage 131 in a radially expanded configuration. The cylinders 105A, 105B retract each linkage 131 in the body 42 against the springs, as shown in Figure 2. As illustrated by the traction module 38A left in Figures 7A and 7B, the freewheels 132 are movable radially relative to the body 42 between a retracted position in the body 42, in which the radial space of the guide means 49 is smaller than the radial size of the drive trains 44A, 44B, and an extended position in which the radial size of the guide means 49 is greater than the radial size of the drive trains 44A, 44B. In the retracted position of the guide means 49, the drive wheels 56A, 56B are applicable to the wall 48 (FIGS. 2 and 7A), whereas in the deployed position of the guide means 49, the drive wheels 56A, 56B are maintained at the distance from the wall 48 when the freewheels 132 are applied to the wall 48 (FIG. 7B). The guiding means 49 thus form means for selectively releasing the drive wheels 56A, 56B. The drive wheels 56A, 56B can thus have a drive configuration of the traction module in which they are applicable against a wall 48 of the duct and a free configuration of descent or ascent of the traction module 38, in which they are maintained at the distance of this wall 48 by the freewheels 132. The operation of the shuttle 10 according to the invention during its descent into the well 12 will now be described.

  Initially, the connection module 36 is fixed to the free end of the cable 30. The shuttle 10 is then introduced into the well 12. During this introduction, the hinge triangle 94 of the rolling roller 82 is held in its position. flattened, retracted into the body 42. For this purpose, the electropump 104 is inactive, the valve 120 is at rest in its normally open position, and the chamber 100 is connected to the tank 102 via the valve 122 Since the pressure in the chamber 100 is low, the return spring 108 holds the cylinder rod 96 in its retracted position. The distance between the first hinge point 88 and the third point 92 is then maximum.

  The shuttle 10 is then introduced into the second duct 20 and then lowered by gravity into this duct 20 to the intermediate elbow 26.

  During this descent, the freewheels 132 are in their normally deployed position to place the driving wheels 56A, 56B in their descent configuration away from the wall 48. The mechanical tension applied on the line 30 is measured by the means measuring 41.

  When gravity is no longer sufficient to lower the shuttle 10 to the bottom of the well 12, the measuring means 41 detect a decrease in the mechanical tension. The traction module 38 is then activated. The safety solenoid valve 120 is controlled to close the first discharge line 112. The electropump 104 is then activated, to increase the pressure in the pipe 106, then in the chamber 100 and in the accumulator 118. The fluid hydraulic pump introduced into the chamber 100, moves the end 105 of the cylinder rod 96 to its extended position, against the return spring 108. When the supply intensity of the electric pump 104 reaches a value threshold, the electropump 104 is cut off. The displacement of the rod 96 towards its advanced position decreases the distance between the third point 92 and the first point 88, which causes the articulation triangle 94 to deploy until the pressure roller 82 comes into contact with the wall 48 of the duct.

  Furthermore, the cylinders 105A, 105B are driven to retract the freewheels 132 in the body 42. The force generated by the hydraulic cylinder 86 is transmitted to the roller 82 to press the wheels 56A, 56B of the two drive trains 44A, 44B against the wall 48, opposite the roller 82 relative to a median horizontal plane in Figure 2. This force is maintained as the pressure in the chamber 100 is substantially equal to the threshold value. In this position, the distance separating the axis of rotation of the roller 82 from the Y-axis Y 'of the body 42 is greater than the distance which separates the axis of rotation of the wheels 56A from the axis Y-Y' of the body 42.

  When the pressure switch 114 detects a pressure drop in the pipe 106, the electropump 104 is reactivated so that the pressure reaches the threshold value again.

  As illustrated in FIG. 6, the radial position of the rolling roller 82 with respect to the body 42 can be modified independently of the generally fixed radial position of each drive wheel 44A, 44B with respect to the axis of the body 42. Thus, whatever the diameter of the duct 16, 20 in which the traction module 38 circulates in its driving configuration, the wheels 56A, 56B are held in contact against the wall of the duct 48 by the application means 46. The longitudinal axis YY 'is therefore not necessarily centered in the duct 48. Then, the motors 50A, 50B are activated to drive the wheels 56A, 56B in rotation and to move the shuttle 10 towards the bottom of the well. During the displacement of the drive wheels 56A, 56B, the roller 82 rolls freely on the wall 48 opposite the wheels 56A, 56B relative to a median horizontal plane of the body 42. During this movement, the deployment of the cable 30 by the winch 32 is controlled to maintain the voltage measured by the measuring means 41 to a minimum setpoint value during a descent into the conduit, and to a maximum setpoint value when rising in the conduit. When the shuttle 10 can be raised to your surface by a simple pull on the line 30, the valve 120 is deactivated and resumes its normally open configuration. The pipe 106 is then connected to the tank 102, which causes the discharge of the hydraulic fluid contained in the pressure chamber 100 to the tank 102. The return spring 108 then retracts the end 105 of the cylinder rod 96 so that that this rod 96 occupies its retracted position. The articulation triangle 94 of the rolling roller 82 is thus brought back into its retracted flattened position in the body 42. The jacks 105A, 105B are deactivated so that the freewheels 132 resume their normally deployed position. In another variant (not shown), the first motor 54A is disposed between the wheels 56A of the distal train 44A and the wheels 56B of the proximal train 44B, substantially facing the roller 82. In another variant, the motors 50A, 50B are both located between the wheels 56A, 56B.

  The second shuttle according to the invention, represented in FIGS. 7A and 7B, comprises a proximal traction module 38A and a distal traction module 38B connected to each other by an articulated hitch 201. The traction modules 38A and 38B are of similar structure to the traction module 38 of the first shuttle. The hitch 201 includes a first hinge point 203A at the proximal traction module 38A and a second hinge point 203B at the distal traction module 38B. The coupling 201 makes it possible to radially spacing the longitudinal axis B-B 'of the distal traction module 38B with respect to the longitudinal axis A-A' of the proximal traction module 38A. Each traction module 38A, 38B is provided with deployable guide means 49 which can be controlled independently of one another. In a first control mode of the second shuttle, the first traction module 38A has a nominal tensile power determined. It is fed at a first fraction of its nominal power greater than 0.7, for example equal to 0.8. The second traction module 38B is fed at a second fraction of the nominal power of the first traction module 38A less than 0.3 and for example equal to 0.2, as represented in FIG. 7A. The presence of two traction modules 38A, 38B overcomes the possible failure of one of the traction modules 38A, 38B. In the event of failure of a desmodule 38A, 38B, the operation in the well is stopped and the shuttle is raised to the surface as described below.

  As shown in FIG. 7A, in this first mode, the pressure rollers 82 of the two traction modules 38A and 38B are activated simultaneously to press the wheels 56A, 56B of the two traction modules 38A, 38B against the wall of the duct 48. Freewheels 132 of the two traction modules 38A, 38B are retracted.

  If the distal traction module 38B fails, the solenoid valve 120 returns to its normally open position, which causes the roller 82 of this traction module 38B to be withdrawn into the body 42. At the same time, the freewheels 1, 32 of the means guide 49 of the distal traction module 38B resume their normally deployed position to position the drive wheels 56A, 56B of this traction module 38B away from the wall 48. In this position shown in FIG. 7B, the longitudinal axis BB 'of the distal traction module 38B is spaced radially from the longitudinal axis AA' of the proximal traction module 38A by means of the hitch 201 which is inclined with respect to the longitudinal axis A-A ' . The pressure roller 82 of the distal traction module 38B is kept retracted into the body 42. In this case, the proximal traction module 38A is supplied with substantially its nominal power.

  In another variant of the first mode of operation shown in FIG. 7A, when a high traction power is to be developed temporarily, the traction modules 38A, 38B are activated simultaneously, at least one of the traction modules 38A, 38B being activated at its nominal power.

  In another variant, the two traction modules 38A, 38B are simultaneously activated at their nominal power. Thanks to the invention which has just been described, it is possible to have a bottom traction module 38 which has a simple structure, inexpensive and reliable, because of the incorporation of the drive wheels 56A, 56B globally in an invariant position relative to the body 42 of the traction module 38 applied to the body 42. The traction module 38 is thus devoid of deployable drive means of the drive wheels or complex transmission means between the deployable drive wheels and the body .

  The safety of the system is also improved by the use of a hydraulic jack 86 which makes it possible to easily and quickly retract the roller pressure roller 82 in the event of an incident, while developing a sufficient force for the application of the wheels 56A, 56B against the wall 48 of the duct 16, 20.

  The presence of at least two traction modules 38A, 38B mounted in series also provides greater reliability and provides a motorization power that can be increased punctually.

Claims (14)

  A bottom pull module (38) for descending into a conduit (16; 20) of a fluid handling installation (12), the pull module (38) being of the type comprising: - a body (42) extending along a longitudinal axis (Y-Y '); at least one drive train (44A; 44B) comprising at least one driving wheel (56A; 56B) connected to the body (42) for moving the traction module (38) in the conduit (16; 20); - Deployable means (46) for applying the or each drive wheel (56A; 56B) against a wall (48) of the duct (16; 20), the application means (46) being arranged substantially opposite the or each drive train (44A; 44B) and comprising: - at least one arm (80) radially expandable relative to the body (42) between a retracted position and an extended position; - a rolling member (82) mounted at a free end of the or each arm (80); means (86) for biasing the or each arm (80) towards its deployed position, characterized in that the or each rolling member (82) is mounted loosely at the free end of the arm (80).   2. traction module (38) according to claim 1, characterized in that the radial position of the or each rolling member (82) is modifiable independently of the radial position of the or each drive wheel (56A; 56B) by relative to the longitudinal axis (Y-Y ').   3. traction module (38) according to one of claims 1 or 2, characterized in that the or each drive wheel (56A; 56B) defines a cylindrical space extending along an axis of rotation of the wheel (56A, 56B), at least a portion of the body (42) being located in the cylindrical space regardless of the position of the arm (80).   4. Traction module (38) according to claim 3, characterized in that the or each drive wheel (56A; 56B) is rotatably mounted in the body (42) in a generally invariant position relative to the body (42).   5. Traction module (38) according to any one of the preceding claims, characterized in that the biasing means comprise a cylinder (86) for deployment of the arm (80) and means (108, 112, 120) of deactivation fast cylinder (86) to retract the deployable arm (80).   6. Traction module (38) according to any one of the preceding claims, characterized in that the application means (46) comprise a hinge triangle (94) of the arm (80), deployable relative to the body ( 42), a vertex (88) of the triangle (94) being fixed relative to the body (42).   7. traction module (38) according to any one of the preceding claims, characterized in that the or each drive wheel (56A) comprises a flange (70A) and a tread (72A) inclined outwardly relative to flange (70A).   8. traction module (38) according to any one of the preceding claims, characterized in that it comprises at least two driving wheels (56A) coaxial disposed on either side of the body (42), the arm (80). ) extending substantially in a plane perpendicular to the axis (54A) of the wheels (56A).   9. Traction module (38) according to any one of the preceding claims, characterized in that it comprises at least two drive trains (44A, 44B) axially spaced along the longitudinal axis (Y-Y '). ), a rolling member (82) being disposed between the two axially spaced trains (44A, 44B), substantially in a median plane (Po) with respect to the two drive trains.   Traction module (38) according to claim 9, characterized in that each drive train (44A, 44B) comprises a drive motor (50A, 50B) of the wheels (56A, 56B).   11. Traction module (38) according to any one of the preceding claims, characterized in that it comprises means (49) for selective release of the or each drive wheel (56A, 56B), to pass the or each driving wheel (56A; 56B) of an active drive configuration of the traction module to a free configuration of descent or ascent of the traction module in the conduit.   12. Shuttle (10), characterized in that it comprises: - at least one traction module (38) according to any one of the preceding claims; connection means (36) to a cable working line (30), the connection means (36) being fixed on the traction module (38) and comprising means (41) for measuring the applied mechanical tension on the line (30); and - at least one bottom tool (40) integral with the traction module (38).   13. Shuttle (10) according to claim 12, characterized in that it comprises two traction modules (38A, 38B) and an articulation hinge (201) of the two traction modules (38A, 38B), the longitudinal axes (A-A ') and (B-B') of the two traction modules (38A, 38B) being radially spaced relative to each other by means of the hitch (201).   14. A method of pulling a shuttle (10) according to claim 13, characterized in that it comprises the following steps: - activation of a first traction module (38A) to a useful power equal to a first fraction of its nominal power; simultaneous activation of a second traction module (38B) at a second fraction of the nominal power of the first traction module (38A), the sum of the first fraction and the second fraction being substantially equal to or greater than the nominal power one of said traction modules (38A). 17. The method of claim 14, characterized in that the first fraction is greater than 0.7 and the second fraction is less than 0.3. 18. The method of claim 14, characterized in that the sum of the first fraction and the second fraction is greater than the nominal power.