AU2010202251B1

AU2010202251B1 - Pipeline pressure device with endless conveyor members for use during a horizontal directional drilling process

Info

Publication number: AU2010202251B1
Application number: AU2010202251A
Authority: AU
Inventors: Marinus Teunis Van Leeuwen Jr.; Anne Dirk Van Leeuwen
Original assignee: Van Leeuwen Boringen BV
Current assignee: Van Leeuwen Boringen Bv
Priority date: 2010-06-01
Filing date: 2010-06-01
Publication date: 2010-12-02
Anticipated expiration: 2030-06-01

Description

P/00/009 AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION Invention Title: PIPELINE PRESSURE DEVICE WITH ENDLESS CONVEYOR MEMBERS FOR USE DURING A HORIZONTAL DIRECTIONAL DRILLING PROCESS The invention is described in the following statement together with the best method of performing it known to us: Our Ref: 102012 PIPELINE PRESSURE DEVICE WITH ENDLESS CONVEYOR MEMBERS FOR USE DURING A HORIZONTAL DIRECTIONAL DRILLING PROCESS The invention relates to a pipeline pressure device for reducing tensile forces on a conveyor 5 pipeline during drawing of the conveyor pipeline in and through a shank which is drilled out in the ground and which extends at least partially in the horizontal direction. In particular, the invention relates to a pipeline pressure device of this type for use during a horizontal directional drilling process. 10 BACKGROUND Horizontal directional drilling (HDD) is a no-dig technology which is used for the installation of underground Infrastructure. Examples of this include the feeding of conveyor pipelines, such as natural gas and petroleum pipelines, water pipelines, telecommunications cables and electricity cables, under rivers, canals and large roads. In a first phase (see also Figure 4a), 15 a drill pipeline, with a drill head provided at the free end thereof, is pushed through the ground, drilling as it goes. The drill head is hollow and is fed from the surface via the drill pipeline with bentonite, which holds the drilled-out drill shank open and at the same time removes excess earth. In a second phase (see also Figure 4b), the drill shank can be widened. After the complete shank has been drilled out and the drill head has returned above 20 the ground, the drill head can be removed from the drill pipeline and replaced by a reamer. The reamer is withdrawn through the shank. During this withdrawing, the reamer enlarges the shank, while at the same time towing behind it a pipeline which provides drilling fluid in order to prevent the shank from collapsing. This reaming may be repeated a plurality of times, depending on the desired diameter of the conveyor pipeline to be Installed (see also 25 Figure 4c). The last phase (see also Figure 4d) is the drawing of the conveyor pipeline. When the reamer has enlarged the shank sufficiently, the reamer is uncoupled from the drill pipeline and replaced by a last reamer. The conveyor pipeline is in this case coupled to the reamer. A swivel between the reamer and the conveyor pipeline prevents rotation of the conveyor pipeline while the conveyor pipeline is towed behind the reamer. The conveyor pipeline Is fully extended at the end of the shank and is placed on rollers, so that it can be retracted relatively flexibly behind the reamer on the drill shank. 5 In order to be able to draw the assembly made up of the drill pipeline, reamer and conveyor pipeline through the shank, a tensile force must be exerted thereon. In order to reduce this tensile force, it is known to exert, for example with the aid of a crane or an overpack clamping mechanism, an additional force on the conveyor pipeline at the side wherein the conveyor pipeline enters the shank, i.e. at the side opposite the original starting point of the 10 shank. The applicant has for a number of years used what is known as a tube pressure machine, which the applicant itself developed. This tube pressure machine is arranged at the end of the shank opposite the original starting point, where the conveyor pipeline is ready in an 15 extended state. The tube pressure machine comprises a frame with three pairs of wheels connected drivably thereto. The conveyor pipeline is fed through between the three pairs of wheels. Driving of the wheels ensures that a thrust Is exerted on the conveyor pipeline. This thrust reduces the tensile force required to draw the conveyor pipeline inward into the drilled out shank. The tube pressure machine thus ensures that it is possible to achieve, on use of a 20 drill-pulling device of a specific capacity, a greater length of conveyor pipeline to be drawn through a drilled-out shank, A drawback of the known tube drilling machine is the fact that slippage can occur between one or more of the wheels and the conveyor pipeline. Such slippage has the risk that it may 25 damage the conveyor pipeline. For example, if the conveyor pipeline comprises an anticorrosive PE coating, this coating may soon become damaged. This leads to major problems in the future, especially because it can considerably shorten the lifetime of the conveyor pipeline in the ground. The risk of slippage may be reduced by increasing the force pressing the wheels against the conveyor pipeline. However, this again increases the risk of deformation of or damage to the (coating of the) conveyor pipeline. A further drawback is the fact that the known tube pressure machine requires a mechanism for synchronizing the wheels in order to prevent the aforementioned slippage. This synchronization is carried out 5 between the wheels of each pair with the aid of a chain The pairs of wheels are synchronized with one another hydraulically. The object of the invention is to obviate at least some of the above-mentioned drawbacks, or else to provide a usable alternative. In particular, the object of the invention is to provide a 10 pipeline pressure device allowing a conveyor pipeline to be drawn or pushed in the ground over considerable distances with no risk of slippage or damage. BRIEF DESCRIPTION OF INVENTION This object is achieved by a pipeline pressure device according to claim 1. The device 15 comprises in this case a frame which is provided with support parts for placing on a sub surface, and at least three drivable endless conveyor members which are drivably connected to the frame and which together delimit a feed-through opening for the conveyor pipeline. The endless conveyor members are each arranged with a longitudinal part around the feed through opening and are configured for exerting a thrust on the conveyor pipeline if the 20 conveyor pipeline is passed through the feed-through opening. Each of the endless conveyor members is passed over at least two head rolls. A drive is provided for driving the endless conveyor members in rotation over these head rolls. The at least two head rolls for one of the endless conveyor members are each placed one after 25 another in the axial direction along the feed-through opening. An endless conveyor member, which is passed over these head rolls placed one after another, extends as a result with a substantially straight longitudinal part along a substantially straight path between the two - o head rolls in a direction which is parallel to the axial direction of the feed-through opening or the conveyor pipeline respectively. The endless conveyor members have relatively large friction surfaces, allowing a high thrust 5 to be advantageously exerted in the axial direction on the conveyor pipeline without the need for a high force pressing the endless conveyor members in the radial direction against the conveyor pipeline. This prevents slippage and the conveyor pipeline remains undamaged and undeformed as a consequence of the more evenly distributed propulsion forces. It is easier for the conveyor pipeline to pass through bends at the original start and opposing end 10 of the drilled-out shank. The conveyor pipeline is pressed by the thrust exerted thereon, as it were, toward the outer bend. As a result, the conveyor pipeline no longer runs, as a consequence of the tensile force which is also exerted thereon, up against the walls of the inner bends of the shank. The tension on the inner bend decreases, so to speak, In this way too, a reduction of the required tensile force may be achieved, or else it is possible to 15 achieve, on use of a drill-pulling device of a specific capacity, a greater length of conveyor pipeline to be drawn through the drilled-out shank. In a preferred embodiment, the endless conveyor members are formed by caterpillar tracks. These are advantageously profiled rubber caterpillar tracks, owing to the good grip which 20 these have on the conveyor pipeline. In particular, at least one of the endless conveyor members is arranged so as to be adjustable with respect to the frame in a direction transverse to the feed-through opening (the radial direction of the conveyor pipeline). This allows the device to be adapted to various 25 diameters of the conveyor pipeline. Also preferably, the adjustability of the endless conveyor members is such that the feed-through opening delimited therebetween is suitable for pipeline diameters of at least 500-1,500 mm.

In one embodiment, the pipeline pressure device, and in particular the frame thereof, has maximum external dimensions which fit within a standard 20-ft container. This ensures that the device can easily be conveyed and can also easily be connected behind other components used during a horizontal directional drilling process. 5 In a further embodiment, the drive can be activated for driving the endless conveyor members in rotation for adjustably varying the speed and thrust of the endless conveyor members. A desired thrust and speed may thus be set as a function of the type of conveyor pipeline to be laid and the route of the shank to be installed. The drive used is for example an 10 oil aggregate. The drive together with the endless conveyor members are preferably selected in such a way as to allow a thrust of more than 500 kN to be achieved. More particularly, the drive and the conveyor members are selected so as to allow a thrust of at least 1,000 kN to be obtained. This is in conjunction with the ability to maintain a safety factor of 2 which helps to ensure that it is impossible for slippage to occur under all circumstances, i.e. including for 15 example wet, slushy conditions. The longitudinal part of the endless conveyor member at the side of the feed-through opening has for this purpose preferably an effective tread length of at least 0.60 metre, in particular at least 2.75 metres. Furthermore, the endless conveyor member has for this purpose preferably an effective tread width of at least 0.20 metre, in particular at least 0.30 metre. 20 Further embodiments are defined in the sub-claims. The invention also relates to a system according to claim 12 and to a method according to claim 15. 25 I I BRIEF DESCRIPTION OF DRAWINGS The invention will be described in greater detail with reference to the appended drawings, in which: 5 Fig. I is a schematic perspective view of an embodiment of the pipeline pressure device according to the invention with three caterpillar tracks; Fig. 2 is a view corresponding to Fig. 1 of a variant with four caterpillar tracks and container dimensions; 10 Fig. 3 is a schematic side view in cross section of a step from a horizontal directional drilling process using the pipeline pressure device according to Fig. 2; Fig. 3.1-3.3 are enlarged partial views of Fig. 3; and 15 Fig- 4a-d are schematic side views in cross section of four successive phases from a horizontal directional drilling process from the prior art. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 20 In Fig. 1, the pipeline pressure device is denoted in its entirety by reference numeral 1. The device 1 comprises a frame with support parts in the form of sleepers 2a and uprights 2b. Three endless conveyor members 5, which are in this case formed by profiled rubber caterpillar tracks, are provided between the sleepers 2a and the uprights 2b. A feed-through opening, through which a conveyor pipeline 6 having a round cross section is fed, is left clear 25 between longitudinal parts 5' of the conveyor members 5, the longitudinal parts being positioned at the inside in a radial direction. The conveyor members 5 extend with their longitudinal parts 5', extending in the longitudinal direction, parallel to the axial direction A of the conveyor pipeline 6. The conveyor pipeline 6 is in this case a hollow tube or hose through which a medium, such as gas or liquid, may be fed, in particular a plastics material tube or a steel tube which is coated with a plastics material layer such as PE or synthetic resin. The endless conveyor members 5 are arranged symmetrically around the feed-through opening or the conveyor pipeline 6 passed therethrough. 5 The conveyor members 5 are passed over slide guides and head rolls, of each of which at least one may be driven by a drive (otherwise not shown). Driving of the conveyor members 5 ensures that a thrust is exerted on the conveyor pipeline 6 in the direction A. A synchronization mechanism, which ensures that the conveyor members run synchronously 10 during operation, may be provided, if desired, between the respective conveyor members 5. The conveyor members 5 may be displaced with respect to the frame in such a way that the feed-through opening becomes larger or smaller. Activatable piston/cylinder systems 8 are provided for this purpose. Other adjusting means, such as a manual adjuster, are also 15 possible. Fig. 2 shows a variant with four caterpillar tracks, like components being denoted by the same reference numerals. The design has remained largely the same, the caterpillar tracks being arranged, again, symmetrically around the feed-through opening. Furthermore, it is 20 also the case for this embodiment that the frame has, with the endless conveyor members located within the internal circumference of the frame, dimensions which fit within a standard 20-ft container. Fig. 3 shows the last phase (in accordance with Fig. 4d) of the horizontal directional drilling 25 process mentioned in the introductory part of the description, namely the drawing of the conveyor pipeline 6 through a shank 10 which was previously drilled out and reamed in the ground. It may be seen that the conveyor pipeline 6 is suspended from a reamer 12 by means of a rotary coupling 11, such as a swivel. The reamer 12 is, in turn, suspended from a drill pipeline 13 which can be drawn through the shank 10 by means of a drill-pulling device 15 which is suitable for this purpose, also known as a rig. The drill-pulling device 15 is arranged at the starting point of the drilled-out shank 10. A supply of the drill pipeline 13, having a total length which is greater than the length of the previously drilled-out shank, is 5 also located here. The pipeline pressure device I according to the invention is deposited at the end point of the drilled-out shank 10. The device 1 is in this case anchored to the ground by means of anchoring rods 17. in a horizontal directional drilling phase preceding Fig. 3 (in accordance with Fig. 4a), the 10 drilling pipeline 13 is passed through the ground, with a drill head provided at the free end thereof, with the aid of the drill-pulling device 15. The drill head is in this case driven and may in each case be adjusted in such a way that the drill head continues to drill out the route of the intended shank 10. This route of the intended shank 10 begins at an initial bend 10' which merges with a horizontal part 10", in order subsequently to pass upward out of the 15 ground again at a final bend 10' The conveyor pipeline 6, which is already extended on rollers (not shown) and is also passed through the pipeline pressure device 1, is located at the end point of the shank 10. This then gives rise to the situation as shown in Fig. 3 (and also in accordance with Fig. 4b). 20 In this case, the shank 10 is completely drilled out, the drill head is uncoupled from the drill pipeline 13 and, instead thereof, the reamer 12 is coupled to the drill pipeline 13. Subsequently, the drill pipeline 13 is withdrawn through the shank 10 with the aid of the drill pulling device 15 while widening the shank 10 with the reamer 12 and drawing the conveyor pipeline 6 inward into the shank 10. At the same time as the withdrawing of the drilling 25 pipeline 13 through the shank 10 with the reamer 12 and the drawing of the conveyor pipeline 6 inward, a thrust is exerted on the conveyor pipeline 6 by driving the endless conveyor members 5 of the pipeline pressure device 1. Owing to this exerting of the high thrust which may be achieved with the pipeline pressure device I according to the invention, a considerable reduction of the required tensile force applied by the drill-pulling device 15 may be achieved, and/or a lower capacity of the drill-pulling device 15 may be sufficient, and/or a greater distance (shank length) may be bridged. As a result of the secure engagement of the endless conveyor members 5 on the conveyor pipeline 6, the large 5 effective area of friction between the endless conveyor members 5 and the conveyor pipeline 6, no slippage occurs and the conveyor pipeline 6 remains undamaged. Nor do the initial bend 10' and the final bend 10' present any further problems as a result of the fact that the conveyor pipeline 6 now continues to run therethrough, as a consequence of the propulsion, through the outer bends thereof. 10 In addition to the embodiments shown, many variants are possible. Thus, instead of caterpillar tracks, use may also be made of other endless conveyor members such as chains with grip elements provided thereon. It is also possible to build the device specifically for a given pipeline diameter and for this purpose to fasten, for example, the conveyor members to 15 the frame at fixed positions. By varying the number of endless conveyor members, the effective tread lengths, the effective tread widths and/or the coefficient of friction thereof, various desired minimum threshold values for the thrust to be supplied may be achieved. In an advantageous variant, two or more pipeline pressure devices are connected in series one after another at the end of the shank to be drilled out. This allows even higher thrusts to be 20 generated in a flexible manner without this leading to damage to the conveyor pipeline to be fed into the ground. Thus, the invention provides a pipeline pressure device which may be built in an expedient and compact manner and can exert in a reliable manner thrusts on conveyor pipelines to be 25 brought into the ground during a horizontal directional drilling process.

Claims

1. Pipeline pressure device for reducing tensile forces on a conveyor pipeline during drawing of the conveyor pipeline in a shank which is drilled out in the ground and extends at least partially in the horizontal direction, comprising: 5 - a frame which Is provided with support parts for placing on a sub-surface; - pressure members which are rotatably connected to the frame and which together delimit a feed-through opening for the conveyor pipeline; and - a drive for driving the pressure members in rotation; the pressure members comprising friction surfaces for, during rotation, exerting in 10 axial direction of the conveyor pipeline, a thrust on the conveyor pipeline if the conveyor pipeline is passed through the feed-through opening, characterized in that the pressure members comprise at least three endless conveyor members which are each arranged with a longitudinal part around the feed-through opening, each endless conveyor member being passed drivable in rotation over at least two head 15 rolls, and the aforementioned longitudinal part of each endless conveyor member extending between the head rolls along the feed-through opening in a direction which is parallel to the axial direction of the conveyor pipeline.

2. Pipeline pressure device according to claim 1, wherein the endless conveyor 20 members are formed by caterpillar tracks.

3. Pipeline pressure device according to one of the preceding claims, wherein the endless conveyor members are profiled rubber belts. 25

4. Pipeline pressure device according to one of the preceding claims, wherein the endless conveyor members are arranged symmetrically around the feed-through opening. - I

5. Pipeline pressure device according to one of the preceding claims, wherein at least one of the endless conveyor members is arranged so as to be adjustable with respect to the frame in a direction transverse to the feed-through opening. 5

6. Pipeline pressure device according to one of the preceding claims, wherein the frame has dimensions corresponding to a standard 20-foot (6.096-metre) container.

7. Pipeline pressure device according to one of the preceding claims, wherein the drive can be activated for adjustably varying the speed and thrust of the endless conveyor 10 members.

8. Pipeline pressure device according to one of the preceding claims, wherein the endless conveyor members together delimit a feed-through opening having a diameter of between 500 and 1,500 mm. 15

9. Pipeline pressure device according to one of the preceding claims, wherein the longitudinal part of the endless conveyor member has a length of at least 0.6 m at the side of the feed-through opening. 20

10. Pipeline pressure device according to one of the preceding claims, wherein the endless conveyor members and drive are configured for together exerting a thrust on the conveyor pipeline of at least 500 kN.

11. Pipeline pressure device according to one of the preceding claims, wherein the 25 longitudinal parts of the endless conveyor members extend substantially in the horizontal direction at the side of the feed-through opening.

12. System for the directional horizontal drilling in the ground of a shank and for subsequently bringing a conveyor pipeline into the shank, comprising: - a drill pipeline with a drill head provided thereon; - a conveyor pipeline; 5 - a drill-pulling device for feeding the drill pipeline in a directional manner through the ground with the drill head provided thereon for drilling out a shank extending at least partially in the horizontal direction, and for afterwards withdrawing the drill pipeline and the conveyor pipeline secured thereto through the shank; and - at least one pipeline pressure device according to one of the preceding claims for 10 reducing, by driving the endless conveyor members, tensile forces on the conveyor pipeline during drawing inward into the drilled-out shank.

13. System according to claim 12, wherein at least two pipeline pressure devices connected in series are provided. 15

14. System according to claim 12 or 13, wherein the drill-pulling device Is arranged at a starting point of the shank to be drilled out and the pipeline pressure device is arranged at an end point of the shank to be drilled out. 20

15. Method for the directional horizontal drilling in the ground of a shank and for subsequently bringing a conveyor pipeline into the shank, including the steps: - arranging a drill-pulling device at a starting point of a shank to be drilled out; - arranging at least one pipeline pressure device according to one of the preceding claims at an end point of the shank to be drilled out; 25 - the directional feeding, with the aid of the drill-pulling device at least partially in the horizontal direction, of a drill pipeline with a drill head provided thereon for drilling out the shank; - coupling a conveyor pipeline to the drill pipeline; - withdrawing the conveyor pipeline with the drill pipeline and a reamer, which may if desired be provided on the drill pipeline, through the shank; and - exerting, at the same time as the drawing of the conveyor pipeline through the shank, a thrust on the conveyor pipeline by driving the endless conveyor members of 5 the at least one pipeline pressure device.

16. A pipeline pressure device as hereinbefore particularly described, with reference to what is shown in any one of Figures 1-3. 10

17. A method for directional horizontal drilling as hereinbefore particularly described, with reference to what is shown in any one of Figures 1-3.