MXPA97006335A - Tool located in the fund of the perforac - Google Patents

Abstract

The present invention relates to a tool located at the bottom of a drill hole to provide a thrust force to an elongated body that extends into a borehole formed in a terrestrial formation, the tool comprises at least one rotating body provided With a plurality of rollers, each roller is expandable against the wall of the borehole at a contact force selected between the roller and the wall of the borehole, the rollers are oriented when they are expanded against the borehole wall, for rotating along a helical path on the wall of the borehole, and a motor for rotating each rotary body, chaerized in that the tool further comprises the measuring means for measuring the thrust force provided by the tool and a system of control to control the thrust force provided by the tool by regulating the rotational torsion of the body rota atorio, in response to the push force medi

Description

- TOOL LOCATED IN THE DRILL FUND FIELD AND BACKGROUND OF THE INVENTION The present invention relates to a tool located at the bottom of the bore to provide a pushing force to an elongate body that extends into a borehole formed in a ground formation. Such an elongate body may be, for example, in the form of a drilling assembly used to drill the borehole. In conventional drilling operations, a compressive load is exerted from the surface and transmitted through the drill string to the trepan to generate sufficient compressive load in the drill bit, this compressive load generally refers to the Treble Weight. When the drilling assembly includes a relatively small diameter pipe which is unwound on the surface and lowered into the borehole when drilling proceeds, this pipeline is also referred to as spiral pipe or coil, the amount of compression that is can transmit by such small diameter tube, it is limited due to the risk of buckling REF: 25381 helical and interlocking or subsequent immobilization of the string or chain. In addition, if the borehole includes a horizontal section, a compressive load exerted on the surface bore column will result primarily in the bore column being pressed laterally against the wall of the borehole in the horizontal section. Therefore, in the absence of measures taken to overcome these problems, the maximum available Trellis Weight during drilling with the coil is unacceptably limited, and sections of the horizontal borehole can only be drilled to a length short. The international patent application WO 93/24728 discloses a tool located at the bottom of the bore to provide a thrust force to an elongated body extending in a borehole formed in a ground formation, the tool comprises at least one rotating body provided with a plurality In the case of rollers, each roller is expanded against the wall of the borehole at a contact force selected between the roller and the borehole wall, the rollers are oriented as they expand against the borehole wall so that they rotate to along a path in the wall of the borehole, and a motor rotates each rotating body. When the rollers of the known tool expand against the wall of the borehole and the motor rotates the body that can rotate or rotate, the tool has a tendency to move the elongated body forward through the borehole due to the Helical path followed by the rollers. Because of the tendency to move forward the tool exerts a pushing force on the elongated body, this pushing force corresponds to the resistance found by the elongate body. When the pushing force is relatively high due to a high resistance of the elongate body, the rollers will slide along the wall of the borehole in the circumferential direction thereof. It will be appreciated that by the continuous sliding of the rollers, the wall of the borehole will become worn out in an increased manner so that the diameter of the borehole is increased. Since the amount of radial expansion of the rollers is limited, the sliding of the driven rollers to a dissipating or fading contact force between the rollers and the borehole wall and therefore to a dissipating thrust force continues. or cancellation. In addition, the rotating body of the known tool is connected directly to a trephine provided in the elongate body, so that during operation the reactive torsion of the trephine is improved or intensified by the reactive torsion of the rotating body.

DESCRIPTION OF THE INVENTION It is an object of the invention to provide a tool located at the bottom of the bore to provide a thrust force to an elongate body that extends into a borehole formed in a ground formation, this tool overcomes the problems of the known tool. It is another object of the invention to provide a tool located at the bottom of the bore to provide a thrust force to an elongated body in the form of a drill assembly extending into a borehole formed in a ground formation, this tool mitigates the reactive torsion of the trephine located at the lower end of the drill assembly. According to one aspect of the invention, a tool is provided located at the bottom of the bore to provide a thrust force to an elongate body that extends into a borehole formed in a ground formation, the tool comprises at least a rotating body provided with a plurality of rollers, each roller is expandable against the wall of the borehole at a contact force selected between the roller and the wall of the borehole, the rollers are oriented as they expand against the wall of the borehole of sounding to rotate along a helical path in the wall of the borehole, and a motor rotates each rotating body, wherein the tool further comprises measuring means for measuring the thrust force provided by the tool and a system of control to control the thrust force provided by the tool regulating the rotating torsion of the rotating body, in response to the pushing force measure. By regulating the rotational torsion in response to the measured thrust force, the ratio or extent of displacement or sliding of the rollers can be controlled since such sliding depends on the rotating torsion of the rotating or rotating body. When, for example, the elongated body includes a bore column and the drilling progress is hindered or hindered due to a hard rock formation encountered by the trephine, the drill bit resistance tends to increase and thus the thrust force provided because the tool tends to increase. The control system will then decrease the rotational torque so that the amount of slip decreases thereby effectively preventing the wall of the borehole from becoming worn. According to another aspect of the invention, a tool located at the bottom of the bore is provided to provide a pushing force to a drilling assembly that extends into a borehole formed in a ground formation, the tool comprises minus a rotating body provided with a plurality of rollers, each roller is expanded against the wall of the borehole at a contact force selected between the roller and the wall of the borehole, the rollers are oriented as they expand against the wall of the borehole. Well of sounding to rotate along a helical path in the wall of the borehole, and a motor rotates each body that can rotate or rotate, where the direction of rotation of the rotating body is opposed to the direction of rotation of the trephine located at the lower end of the drilling assembly. By the trepan or rotary body and rotating body that have opposite directions of rotation, the reactive torsion of the trepan is partially or totally compensated by the reactive torsion of the rotating body, thus the application of the drill string or column is possible Drilling of relatively small diameter, for example coil or spiral pipe, to be applied. The tool located at the bottom of the bore of the invention can be used for several applications, for example for borehole pushing tools, or for drilling the borehole. The tool is specifically attractive for extended reach drilling where extremely long drilling wells are to be drilled, as required for the operation of some oil / gas extracoastal or submarine fields. The invention will be described later in greater detail and by way of example with reference to the appended drawing in which: Figure 1 shows schematically one embodiment of the tool located at the bottom of the perforation according to the invention. Referring to Figure 1, the tool located at the bottom of the perforation 1 according to the invention, includes an upper connector 2 for connecting the tool 1 to an upper part of a mounting for drilling (not shown), and a lower connector 3 for connecting the tool 1 to the bottom of the drill assembly. The connectors 1, 3 are interconnected by means of a central shaft or shaft 5 to transmit from the lower connector 3, via the shaft or shaft 5, to the upper connector 2, or vice versa. A measuring device 6 of the thrust force is located in the lower connector 3, this measuring device 6 in operation thereof provides an electrical signal representative of the thrust force provided by the drilling tool 1 to the lower part of the assembly of drilling. In the schematic representation of Figure 1 the axis or tree 5 is indicated as a single element, however, in practice the axis 5 suitably consists of a number of sections of the interconnected axis or tree. The tool 1 is provided with a Moineau motor 7 having a stator 9 fixedly attached to the upper connector and a rotor 11 which has a longitudinal bore 13 through which the central shaft 5 extends. The rotor 11 of the Moineau engine 7 drives a first body that can rotate 15 by a clutch assembly 17 which is operated by means of a piston / hydraulic cylinder assembly 19. A bearing 21 is provided between the first rotary body 15 and the stator 9 of the Moineau engine 7 to allow rotation of the body 15 relative to the stator 9 of the engine 7. The first rotating body 15 is provided with a set of rollers 23 of which only one roller is shown for reasons of clarity. Each roller 23 has a rotation axis 25 which is inclined relative to the longitudinal axis of the rotating body 15 so that, when the tool 1 is located in a sounding hole formed in a ground formation and the rollers 23 are in contact With the borehole wall, the rollers 23 follow a helical path along the wall of the borehole when the first rotating body 15 rotates. The tool 1 further comprises a second rotating body 25 provided with a set of rollers 27 of which only one roller is shown for reasons of clarity. Similar to the rollers 23 of the first rotary body 15, each roller 27 has a rotation axis 29 which is inclined with respect to the longitudinal axis of the rotary body 25 so that, when the tool 1 is located in a borehole formed in a ground formation and the rollers 27 are brought into contact with the borehole wall, the rollers 27 follow a helical path along the wall of the borehole when the second rotating body 25 rotates. The second rotating body 25 is rotationally driven or driven by the first rotating body 15 via a gear assembly 31 which is only indicated schematically in the Figures. The gear assembly 31 has three interconnection or switching positions, whereby in the first interconnection or switching position the second rotary body 25 has the same rotation speed as the first rotary body 15, in the second position of interconnection or switching the second rotary body 25 has a higher rotational speed than the first rotating body 15, and in the third interconnection or switching position the second rotary body 25 rotates at the same speed as in the second interconnection or switching position but in the direction reverse. The gear assembly 31 is electrically controlled so that it is commuted between the three interconnection positions via a conductor (not shown) that extends along the drill assembly to the appropriate control equipment on the surface. A bearing 32 is provided between the second rotary body 25 and the lower connector 3 to rotatably support the body 25 relative to the connector 3. Each roller 23, 27 is expanded or extended in the radial direction to be pressed against the wall of the borehole, by means of a hydraulic piston / cylinder assembly 33, 35 which is capable of moving the axis of rotation 25, 29 of the roller 23, 27 in the radial direction of the rotating body 15, 25. The piston / cylinder assemblies 33 belonging to the rollers 23 of the first rotating body 15 are operable independently of the piston / cylinder assemblies 35 that belong to the rollers 27 of the second rotating body 25. An electronic control system 37 is arranged in tool 1, this control system 37 is provided with a regulating assembly for the pushing force which is to be supplied by the tool 1 when in operation, this assembly can be to vary by an operator on the surface by means of a control system (not shown) electrically connected to the control system 37 via a conductor (not shown) extending along the pedestal assembly. rforation. The control system 37 receives an input signal from the measuring device 6 of the pushing force by a wire or wire 38, this input signal represents the pushing force provided by the tool 1 to the drill assembly in which the tool is incorporated. The control system 37 is connected, via a wire or wire 40, to a hydraulic power source 42. The piston / cylinder assemblies 33, 35 belonging to the rollers 23, 27 are hydraulically connected to the power source 42 via control lines 44, 46, and the piston / cylinder assembly 19 belonging to the clutch assembly 17 is hydraulically connected to the power source 12 via the control line 48. A valve system (not shown) is provided in the tool 1 for selectively opening or closing the hydraulic connections between the power source 42 and each piston / cylinder assembly 19, 33, 35, this valve system is electrically controlled on the surface by a conductor (not shown) extending along the drilling assembly. Thus, by controlling the valve system, the piston / cylinder assemblies 19, 33, 35 can be operated in a mutually independent manner. The control system 37 is programmed to induce power source 42 to operate the piston / cylinder assemblies 19, 33, 35 in a manner that minimizes deviations from the thrust force of the thrust force setting. During the normal operation of the tool located at the bottom of the bore 1 it is incorporated in the lower section of a drilling assembly that extends into a borehole which is drilled in a ground formation. The upper connector 2 is connected to an upper part of the drilling assembly, and the lower connector is connected to a lower part of the drilling assembly. The upper part of the drilling assembly is significantly longer than the lower part of the drilling assembly, this lower part only includes a drilling motor located at the bottom of the drilling or borehole that drives a trephine and one or more outriggers. Optionally the bottom of the drill assembly may also include one or more sections of heavyweight drill pipe. When a selected thrust force is desired to maintain the Weight Over the Trephine (PST), the desired thrust force setting is programmed into the control system, and the valve system is operated so that the piston assemblies / cylinder 33 of the first rotating body come to be hydraulically connected to the power source 42. The motor 7 is operated and the clutch assembly 19 is engaged so that the motor 7 drives or drives the first rotary body 15. The control system 37 receives an input signal representing the actual pushing force of the measuring device 6, compares this signal with the thrust force setting, and induces the power source 42 to operate the piston / cylinder assemblies 33 to expand the rollers 23 against the wall of the borehole. The degree of expansion corresponds to the contact force between each roll 23 and the borehole wall, which is required to minimize a difference between the actual thrust force and the thrust force setting. When the rollers 23 are pressed or compressed against the wall of the borehole, the rollers 23 rotate along a helical path in the borehole due to the rotation of the first rotating body 15 whereby a pushing force is induced axial to the tool 1, this pushing force acts in the direction of the trephine at the lower end of the drill assembly. When the actual thrust force is lower than the clamping or adjustment of the thrust force, the control system 37 induces the power source 42 to operate the piston / cylinder assemblies 33 to increase the contact force at which the rollers 23 expand against the wall of the borehole. Conversely, when the actual pushing force is greater than the clamping or adjustment of the pushing force, the control system 37 induces the power source 42 to operate the piston / cylinder assemblies 33 to decrease the contact force to which the rollers 23 expand against the wall of the borehole. Instead of, or in addition to, the control system 37 which induces the power source 42 to operate the piston / cylinder assemblies 33, the control system 37 can induce the power source 42 to operate the piston assembly. cylinder 19 of the clutch assembly 17 so that sliding of the clutch assembly 17 is allowed when the pushing force has been reduced. When the thrust force assembly is greater than the thrust force which can be achieved by the rotating body 15, the gear assembly 31 is switched by an operator on the surface to its first interconnection or switching position in which the first rotating body 15 and the second rotary body 25 rotate at the same speed. further, the valve system is positioned to hydraulically connect the piston / cylinder assemblies 35 to the power source 42. The control system 37 then induces the power source 42 to operate the piston / cylinder assemblies 35 to expand the rollers 27 of the second rotating body against the wall of the borehole. Thus the actual pushing force is improved due to the additional pushing force provided by the second rotating body 25. In an alternative mode of operation of the tool 1 located at the bottom of the bore, the valve system is adjusted so that the piston / cylinder 33 mounts of the rollers 23 are not operated, while the piston / cylinder 35 mounts of the rollers 27 are operated so that the rollers 27 are pressed or pressed against the wall of the borehole. The gear assembly 31 is switched or interconnected to its second interconnection or switching position in which the second rotary body 25 rotates at a higher speed than the first rotary body 15. In this way the tool is used to move the assembly of drilling through the borehole during disconnection or disengagement in the downward direction. In another alternative mode of operation of the tool 1 located at the bottom of the bore, the valve system is adjusted so that the piston / cylinder assemblies 33 of the rollers 23 are not operated, while the piston / cylinder assemblies are not operated. 35 of the rollers 27 are operated to press or compress the rollers 27 against the wall of the borehole. The gear assembly 31 is switched to its third interconnection or switching position in which the second rotating body 25 rotates at a relatively high speed in the reverse direction. In this way the tool is used to move the drilling assembly through the borehole during disengagement or disengagement in an upward direction. Instead of, or in addition to, controlling the actual thrust force provided by the tool 1 by controlling the contact force between the rollers 23, 27 and the borehole wall, the control system 37 can be programmed to control the force of actual thrust controlling the amplitude or sliding rate of the clutch assembly 19 so as to minimize a difference between the actual thrust force and the adjustment or adjustment of the thrust force. In case the actual thrust force is only controlled by the amplitude of the sliding of the clutch assembly 19, the contact forces between the rollers 23, 27 and the borehole wall remain constant. In addition, instead of, or in addition to, applying the clutch assembly described above, the tool can alternatively be provided with a power supply regulator which regulates the amount of energy provided for the motor to regulate the motor torque. . The power supply regulator is controlled by the control system, and may be in the form of a controllable hydraulic bypass conduit for the Moineau engine described above. If an electric motor is used in place of a Moineau motor, the power supply regulator can take the form of an electric current regulator controlled by the tool control system. In the modality described above the Moineau motor has an internal longitudinal shaft or shaft which serves as the rotor and an external cylindrical housing serving as the stator, by means of which the rotor has a longitudinal bore through which the shaft or shaft The center is interconnected with the ends of the upper and lower connector. In an alternative arrangement an inverted Moineau motor can be applied, this inverted Moineau motor has an internal longitudinal shaft or shaft that serves as the stator and an external cylindrical housing that serves as the rotor. The internal shaft or shaft is then part of the axis or central shaft that interconnects the upper connector and the lower connector, and the cylindrical housing then drives or drives each cylindrical body by the clutch assembly. Furthermore, instead of the gear assembly described with reference to Figure 1, which has three interconnection or switching positions, whereby in the second interconnection or switching position the second rotating body has a further rotational speed High that the first rotating body, a gear assembly can be applied which does not have positions of interconnection or switching but which continuously drives or activates the second rotating body at the highest rotational speed. The switching or interconnection between the movement of the tool through the borehole at a low speed and a high speed is then achieved by the selective expansion of the rollers of the first rotating body or the rollers of the second rotating body against the wall of the rotating body. Well of sounding. It will be appreciated that the tool at the bottom of the bore described above may be applied in combination with any suitable drilling assembly, for example an assembly that includes one or more of the following components: a steering tool for steerable drilling, a measurement while the device is drilling, and a spiral pipe or coil.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which refers to the manufacture of the objects to which it refers.

Having described the invention as above, the content of the following is claimed as property

Claims (16)

1. A tool located at bottom of bore to provide a thrust force to an elongate body that extends into a borehole formed in a ground formation, tool is characterized in that it comprises at least one rotating body provided with a plurality of In case of rollers, each roller is expanded against wall of borehole at a contact force selected between roller and borehole wall, rollers are oriented as expand against borehole wall to rotate along length of borehole. helical path in wall of borehole, and a motor for rotating each rotating body, wherein tool fur comprises measuring means for measuring thrust force provided or supplied by tool and a control system for controlling force of thrust provided or supplied by tool regulating rotating torsion of rotating body, in response to measured thrust force.

2. tool located at bottom of perforation according to claim 1, characterized in that control system regulates torsion by regulating contact force selected between each roller and wall of borehole.

3. tool located at bottom of perforation according to claim 2, characterized in that axis of rotation of each roller is expanded in radial direction to press or compress roller against wall of borehole, whereby force of Contact is regulated by regulating radial expansion of axis of rotation of roller.

4. tool located at bottom of perforation according to any of claims 1-3, characterized in that control system regulates torsion required to rotate body that can rotate by regulating torque provided by motor to rotating body.

5. In addition, it comprises a clutch assembly for transmitting torsion of motor to rotating body, wherein control system regulates torsion required to rotate rotating body. when regulating proportion or amplitude of slippage of clutch assembly.

6. tool located at bottom of perforation according to claim 4 or 5, characterized in that it also comprises a power supply regulator which regulates proportion or amount of energy provided to motor, wherein control system regulates torsion required to rotate rotating body by regulating amount of energy supplied to motor by power supply regulator.

7. tool located at bottom of hole according to any of claims 1-6, characterized in that it also comprises switching means for switching between a first mode of operation of tool and a second mode of operation of tool, wherein in first mode of operation tool moves through drill hole at a lower speed than in second mode of operation.

8. tool located at bottom of perforation according to claim 7, characterized in that switching means include a gearbox for switching between a first rotational speed of rotating body and a second rotational speed of rotating body, first rotation speed that is less than second rotation speed.

9. tool located at bottom of perforation according to claim 7, characterized in that tool comprises a first and a second of rotating bodies, switching means includes a gear box for switching between rotation of first rotating body and rotation of second rotating body, speed of rotation of first rotary body that is less than speed of rotation of second rotary body.

10. The tool located at the bottom of the hole according to any of claims 1-9, characterized in that the motor forms one of the group of: a Moineau motor having a stator in the shape of the motor housing and an internal rotor, an inverted Moineau motor that has an internal stator and a rotor in the shape of the motor housing, a paddle motor, a turbine, and an electric motor.

11. The tool located at the bottom of the borehole according to any of claims 1-10, characterized in that the elongate body includes a bore assembly extending from the surface of the earth in the borehole, the bore assembly that It has a trephine arranged at the lower end of it.

12. The tool located at the bottom of the perforation according to claim 11, characterized in that the direction of rotation of the rotary body opposes the direction of rotation of the trephine.

13. The tool located at the bottom of the perforation according to any of claims 1-12, characterized in that the elongated body includes a spiral pipe or coil extending from the surface of the earth to the borehole, the located tool at the bottom of the hole is connected to a lower end of the coil.

14. A tool located at the bottom of the bore to provide a pushing force to a drilling assembly extending in a borehole formed in a ground formation, the tool is characterized in that it comprises at least one rotating body provided with a plurality rollers, each roller expands against the wall of the wellbore to a force selected contact between the roller and the wall of the borehole, the rollers are oriented when expanded against the wall of the borehole to rotate along a helical path on the wall of the borehole, and a motor rotating each rotating body, wherein the direction of rotation of the rotating body is opposed to the direction of rotation located at the lower end of the mounting hole reamer.

15. The tool located at the bottom of the hole according to claim 14, characterized in that the drill assembly includes a spiral pipe or coil extending from the surface of the earth to the drill hole, the tool located in the bottom The perforation is connected to the lower end of the coil.

16. The tool located at the bottom of the hole substantially as described hereinabove with reference to the drawing.