MXPA97004357A

MXPA97004357A - A method of drilling and mounting barrena to perform the met

Info

Publication number: MXPA97004357A
Application number: MXPA/A/1997/004357A
Authority: MX
Inventors: Ilomaki Valto
Original assignee: Ilomaeki Valto
Priority date: 1994-12-13
Filing date: 1997-06-12
Publication date: 1998-02-01

Abstract

The present invention relates to a method for drilling a well in the ground by means of an auger assembly, and an auger assembly comprising an angular auger (2) for drilling the outer circle of the well, and to which a system is coupled. of protective tube (4), mounted in the hole while drilling, and a cylindrical inner auger (1) for drilling the central portion of the well, from which at least one rotary movement is transmitted to the outer auger (2). ). The perforation by the external auger (2) and the extraction of the protection tube (4) are disconnected if necessary by the inverse rotation of the inner auger, after which the drilling with the internal auger (1) is continued only.

Description

A METHOD OF PERFORATION AND ASSEMBLY OF BARRENA TO CARRY OUT THE METHOD DESCRIPTION OF THE INVENTION This invention relates to a method according to the introductory part of patent claim 1 and to an assembly of bit or bit according to the introductory part of patent claim 5, to perform the method on drilling from a well or tunnel, in the ground, and to a drill bit according to patent claim 8. The double bit assemblies are previously known, for example from the specifications of Finnish Patent Fl 933074 and British Patent GB 2,255,365, where the internal auger that drills the central well can be pulled out from the well, while the ring auger that drills the outer well circle is left in the borehole. However, in these examples the internal auger can be pulled out from the well after drilling, and also reinstalled if drilling is continued. In the drilling of a well in the ground, the most general case is that the first portion of the well is made in soft soil, whereby a protective tube is pushed into the well drilled. REP: 24977 Eventually, when hitting the rock, the protection tube is no longer necessary. The perforation can then be continued without a protection tube if the drilling procedure change is easy. The problem is the difficulty to change the way to drill. The internal auger must then be pulled out of the well and replaced with an auger drilling a "smaller diameter borehole." In this replacement, the entire installation equipment is pulled out from the borehole and reinstalled provided with a new bore. rock drilling bit This takes time and money, especially if the first hole in the ground is long By means of a method and assembly of auger with an appropriate auger according to this invention, a surprising improvement of this is achieved disadvantage, and the invention is characterized by what is presented in the patent claims The advantage of this invention is that a well that requires a protection tube is drilled with the same bit assembly as a well inside the rock. When the protection tube is not necessary, the perforation proceeds without stopping with the internal auger only, in case the perforation is stopped at a closed end, The internal auger can be pulled out through the external auger. Even the external auger can be pulled out from the borehole with the condition that also the protection tube is pulled out simultaneously. The auger assembly and method can be applied for hammer drilling but also for rotary drilling only. The groove in the bayonet joint opening in both axial directions is favorably accommodated as a flow channel for the jet wash medium, wherein the joint is a simple construction. In the subsequent the invention is described with reference to the accompanying drawings, where: Figure 1 shows a section of the auger assembly along line A-A.

Figure 2 shows the bit assembly observed from the front.

Figure 3 shows the surface of the internal bit observed from one side.

Figure 4 shows a section of the hole, where the drilling proceeds by the internal drill only.

Figure 5 shows a cross section of the angular auger.

Figure 1 illustrates a section of the auger assembly including a cylindrical internal auger 1, secured to the head of the hammer 7, an external auger 12 of annular shape around the internal auger, and a protective tube 4 mounted in the hole, while drilling and reaching the outer shell of the external drill 2. The internal drill 1 and the external drill 2 are interconnected by a bayonet seal, where the rotation is transmitted to the outer auger by the internal auger. The internal auger 1 also transmits the hammer impacts to the outer auger 2. The outer auger 2 pulls the protection tube 4 towards the hole by means of the joint return between these, which has a restriction for the mutual axial movement. Figure 2 shows that in the circle between drills 1 and 2 there are three bayonet joints, where in the internal drill 1 there are three • _ >; axial grooves 6 to run through the auger. Correspondingly, there are three protruding parts in the internal drill 2 with the same spacing in which the grooves 6 move. Laterally from the grooves 6 in the surface of the drill 1, as in Figure 3, there are notches for the protruding parts 3, within which the protruding parts are guided due to the mutual rotation of the bits. With this, the augers 1 and 2 are in a secured state and the auger 2 is rotated by the auger 1, while the fastener is retained. The fastener is opened by reverse rotation. The protruding parts 3 are square in order to receive the impacts coming from the inner drill and to transmit them to the external auger on a larger face. The groove 6 of the auger 1 is also a flow channel for the jet washing medium, whose flow direction, in this case, is rearward in the channel. In Figure 4 the perforation has advanced towards a site, where the annular bit 2 and the protection tube 4 have been left. The drilling has only been carried out by the drill 1. For the removal of the internal drill from the external auger, the rotation of the drilling assembly has been reversed.

The hammer 7 transmits the rotation to the auger 1. The reverse rotation of the auger 1 opens the bayonet seal in such a way that the protruding part 3 rotates in the groove 8 and enters the groove 6, after which it further perforates by reverse rotation, the protruding parts 3 slide out of the grooves 6 towards the front side of the ring bit, where the ring bit stops rotating and remains, completely immobile. The internal drill pierces the rock or other hard floor that does not break in the well. If the perforation is stopped at a desired depth or length, auger 1 and drilling equipment are pulled out from the well. The auger 1 passes the annular auger 2 running through it, when the auger is rotated in a position where the protruding parts 3 strike the grooves 6 and slide through the auger 2. Figure 5 illustrates an example of the auger annular 2, with several protruding parts or in projection 3 for several axial bayonet seals, sequentially accommodated, by means of which the construction of a face is produced to transmit the impacts to the ring bit 2. Likewise, the tube of Protection is pulled with several sequential shoulder faces. By using many MU-bayonet joints. . » sequentially and pulling the shoulders of the protection tube 4, it is possible to make the annular bit 2 thinner and even stronger enough for the longer lasting perforation. By means of a method and an auger assembly as described in this invention, it is possible to carry out advantageously, for example the anchor hole, where the bore is made by the outer auger until it hits the rock and a some distance by the inner drill in the rock. Since the reverse jet wash is used for the removal of drilling waste, which exists through the internal auger 1 a straight channel pipe to the surface, an anchor wire rope can be taken through the channel to the bottom of the well and, for example, by pulling it up from the auger, it can be emptied through the channel into the well. When the well is filled and the auger 1 is pulled out at the level of the annular auger 2, the outer auger and even the protective tube are then pulled out and the well is filled with concrete at the same time. If during the drilling the ring bit and the protection tube have been left in the 'Well at a stage too early, the inner auger can be pulled up towards the annular auger and t * ~. * secured, and drilling is continued. In order to adequately carry out the mutual rotation of the bits 1 and 2 necessary for the securing, it is essential to record on the floor the mutual depth position of the protection tube and the drill rod inside it, when the bits 1 and 2 are insured, so that reinsurance could be performed in the same position. This is of great significance, especially if there are several sequential bayonet seals between the augers, as shown in FIG. 5. The internal auger 1 according to this invention is characterized in that on its outer shell there are transverse annular grooves 8 ending in a vertical wall 9. The groove 8 flanks the function as the faces transmit the impacts to the annular bit 2 and the face 9 as the means of transmitting the rotation. The outer shell of bit 1 lacks stepped shoulders that transmit the impact, known in previous designs. By means of a method and the auger assembly according to this invention, vertical wells as well as horizontal wells can be drilled. Similarly, the axial groove of the bayonet joint may also be in the annular bit and the projection part in the inner bit.

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 is clear from the present description of the invention.

Having described the invention as above, property is claimed as contained in the following:

Claims

1. A method for drilling a well in the ground by means of an auger assembly, comprising an annular drilling bit, for drilling the outer circle of the well, and to which is attached a protection tube system, on which it is mounted the well when the drilling advances, and a cylindrical internal drill to drill the central portion of the well and from which at least the rotary movement is transmitted to the external auger, characterized the method because the drilling by the external auger and the pulling towards outside the protective tube are stopped by disconnecting the outer auger from the inner auger at a desired point, after which the bore is continued with the inner auger only.

2. A method according to claim 1, characterized in that the drilling is carried out by hammering drills, while the internal drill transmits the impacts to the outer drill by means of projecting or projecting parts in the bayonet joint.

3. A method according to claim 1 and 2, characterized in that the inner auger can be pushed through the outer auger in each direction and, if necessary, the outer auger can be secured to the inner auger.

4. A method according to any one of the preceding claims 1 to 3, characterized in that the first portion of the well is drilled by the complete auger assembly, the second portion with the inner auger and the inner auger removed from the well either alone or together with the ring bit and the protection tube.

5. An auger assembly that includes an internal auger that pierces the center of the well, and an annular auger that perforates the outer circle of the well, and at least one joint that transmits the rotation between said augers, and a protection tube mounted in the well during drilling, it is coupled to the outer auger, characterized by the assembly because the inner auger can be threaded through the outer auger from each direction, the outer auger secured by interrotating both augers and in which at least one auger is secured It is rotating and moving along with the other bit.

6. An auger assembly according to claim 5, characterized in that between the augers there are one or more sequential bayonet seals, and projecting or projecting portions in these "seals that transmit the rotary movement and the drilling force, for example, the impacts, to the external auger.

7. An auger assembly according to claims 5 and 6, characterized in that the axial groove in one of the augers: or the bayonet seal, is also the flow channel of the jet washing medium.

8. An internal auger that is formed with the annular auger, which perforates the outer circle of the well, a unified auger assembly to drill a well or tunnel in the ground, characterized because they exist on the outer cylindrical shell of the inner auger, transverse grooves with with respect to the axial direction, the side faces of which are extruded in the direction of the radius of the inner bit and transmit the impacts and / or the rotation to the ring bit.

9. An internal auger according to claim 8, characterized in that one or more axial grooves exist on its shell.

10. An internal auger according to claims 8 and 9, characterized in that there are several annular grooves, axial, sequentially arranged on the shell and because the grooves end in the wall.