Planetary bur

 

(57) Abstract:

The invention relates to the field of drilling equipment, and in particular to means for drilling large diameter. The inventive planetary auger includes fixed in the lower and upper traverse the mud motor, the axis of which is offset from the axis of the borehole, the mud motor is associated with a column of drill pipe through the Central shaft, wherein the longitudinal axis of the turbodrill is inclined to the axis of the Central shaft at an angle from 30 minutes to 7oand for stabilization and centration of the planetary drill along the axis of the hole it has enshrined in traverse drilled barrel, the lower end of which the screw is mounted a roller satellite-runner. The invention provides improved performance drilling by increasing the axial load on the bit and reduce vibration of the planetary borax. 2 C.p. f-crystals, 3 ill.

The invention relates to the field of drilling equipment, in particular for technical means is lowered into the wellbore through which drilled wells for various purposes with a diameter of from 590 to 2450 mm

Well-known and widely spread in Russia and the republics of the former USSR planetary multicurved. USSR N 122464 "Assembly for drilling large diameter shafts".- Bulletin of inventions N 24 1962; a reference manual for jet turbine drilling. - N. P. Zhilenko, A. A. Krasnoshek.- M.: Nedra, 1987). With their help has been solved complex problems of sajtostoroenii, drilled oil and gas wells with a diameter of 394 and up to 590 mm, and videossaudi wells and ventilation shafts. However, more than forty years of history of use of these Boers were identified and their main disadvantages. Primarily these include: the division of the flow of washing liquid supplied to drill pumps to MultiTerminal unit, between a large number of engines; excessive sliding of the arms of the cutter bits on the destroyed face of the wellbore.

The division of the flow of washing liquid between the two and especially three and four turbodrills minimizes torque of each of them. At the same time, the portable motion of each of the bits around the geometric center of the bottom of the wellbore increases momentally interaction weapon cones with rock bottom, sharply intensified the wear of the teeth (or pins) and bearing cones.

Both of evich loads, as a rule, within the range of values from 0 to 2 tons. The consequence of this fact is the low mechanical speed deepening slaughter and low penetrations per flight (slotting).

As the closest prototype we consider "Device for drilling downhole motor", performed according to the description by the author. mon. USSR N 101417 priority from 10.01.1953,

In this device..." one turbodrill resulted in a rotation of the bit, and the column of drill pipe (that is, the rotary shaft of the drilling rig), to which the turbodrill fastened with eccentric sub, rotated the axis of the bit around the geometric center of the bottom hole. The role of the decentralizer turbodrill in the wellbore performed friction with the wall cover, worn on his body. Despite the apparent simplicity of design, it is easy to imagine the situation, when the axis of one of the three cones or mnogochastichnogo bit designed on the plane destroyed the surface of the face, takes a position that is perpendicular to the radius of the circular surface of the face. At this point, the rotary table of the drilling rig "drags" the roller cutter on the face; sliding her arms at the bottom reaches the maximum value, which is quite on its trunnion - maximum overload experiencing ball number of the lock bearing. It is the fact of "pulling" of the roller cones on the bottom explains the very large increase in specific torque on the bit.

Wear decentralise cover housing mud motor leads to cross-demolition axis eccentric Assembly and the vibration, the frequency of which is proportional to the rotational speed of the drill string, and the amplitude increases with wear of the cover from sliding friction on the borehole wall. The only merit of this scheme is the implementation of the flush fluid flow in one turbo-drill, allowing you to build up to a possible maximum torque.

The aim of our invention is to provide a drill that allows you to significantly reduce the specific torque, implemented on a roller bit, performing a planetary motion around the geometric center of the well bore large diameter.

Our invention allows not only to eliminate the transverse vibration of the unit, but also to significantly reduce the specific torque on the bit that first time in the practice of the planetary Boers allows drilling p is the Nature of our invention consists in so mounting the scheme turbodrill in traverse downhole Assembly, when driven in rotation of the bit produces a downhole wellbore very specific form - "cone up". At the same time centering and stabilization of the axis of the Assembly along the axis of the wellbore by using satellite cone - "runner", spindle which is attached to a special swellendam trunk enshrined in the traverse unit.

For this purpose the upper and lower traverse planetary auger fixed to the Central shaft, which has its upper threaded end (or with flange connection) is fastened to the lower pipe of the drill string. The longitudinal axis of the turbo-drill fixed in the upper and lower lifting beams, inclined to the longitudinal axis of the Central shaft at an angle between 30 minutes and 7o. For this purpose, the hole in the lower cross beam, which is attached to the turbodrill, radially offset to the longitudinal axis of the Central shaft relative to the hole in the upper cross beam, which also serves for fastening of the turbodrill.

Axle cone satellite-runner, which is the stabilization of the situation and focus planetary borax in the barrel drilled wells, is attached to the lower part of the special swerling trunk, which in turn is attached those nipples.

The invention is illustrated in three figures.

In Fig. 1 shows odnokorennye planetary drill.

In Fig. 2 shows the satellite-"runner", recorded with the bearings on my journal.

In Fig. 3 depicts a satellite,"thumb" asymmetric journal.

The invention is illustrated by a detailed description.

The Central shaft 1 planetary drill its upper threaded or flanged end is attached to a heavy - bottom of the drill pipe, rotating the rotary table of the drilling rig. On the shaft 1 fixedly mounted: bottom cross-piece 2 and traverse the top 3. In transect 3 fixed (welded) connecting sub 4, to which the threaded or flange connection secures the turbodrill 5. In the traverse 3 is also fixed (welded) long sirleny the barrel 6, which is fixed in traverse 2. In its lower part (under the head plate 2) barrel 6 has a threaded nipple or flange), to which is attached the pin 7 satellite-runner 8. The slider 8 is fixed on the axle 7 by means of radial bearings 9 and locking ball bearing 10. Calibrating the wellbore lower conical surface of the thumb reinforced with hard alloy pins. OS is the center of the hole in the cross beam 2, where the wound turbodrill 5 (for fastening to the connecting sub 4), is shifted radially towards the axis of the Central shaft 1 to the desired value relative to the center holes in the cross beam 3, which is welded sub 4.

The mud motor 5 is attached to cross beam 2 by a nut 11. To the shaft 12 of the mud motor 5 is attached to the bit 13. The shape of the roller cones 13 and their armament, milled teeth or pins are so subzone or whip crowns simultaneously contacted (relied) with a plane perpendicular to the axis of its mounting thread (or flange).

Above the upper transverse beam 3 is mounted (welded) to the Central shaft (hollow) 1 and connecting sub 4, and sirleny barrel 6 one common or two pipe 14, hydraulically connecting the cavity of the shaft 1 with a cavity swerling shaft 6 and the cavity inside the turbodrill 5, in which the turbine and its supporting elements. With fittings drill string 14 is hydraulically communicated with the bit 13 and satellite - runner 8. Depending on the softness and plasticity formations drilled fixing swerling shaft 6 in traverse 2 and 3 can be implemented so that its axis was parallel to the axis of the Central vnesenii to the axis of the Central shaft 1. For this purpose, the hole in the lower cross beam 2, which is wound and welded sirleny the shaft 6, is shifted radially towards the axis of the Central shaft 1 relative to the hole in the upper cross beam 3, which also serves for fastening swerling shaft 6. The slope should be greater than the hard and abrasive rocks are supposed to drill.

For cases when it is necessary to drill the well holes of large diameter in a very strong and abrasive rocks, such as gravel, boulders, okremnennye Sandstone, quartzite, granite and the like, the journal of satellite-runner should perform asymmetric with respect to its thread (see Fig. 3). In this case, the satellite-runner attached to the drilled shaft 6 so that the axis 15 of the bearing part of its trunnion 7 intersect with the axis 20 of the Central shaft 1 in the top face of the cone - point 16 where it contacts the peripheral arms of one of the calibrating roller cones 13. Form 17, on which are displayed the heads of the pins 18, is pressed into the body of the milling cutter 19 satellite-runner must also intersect at the point 16. Such a performance runner ensures long trouble-free operation.

Work planetang is to the bottom (first) heavy pipe of large diameter, then begins its descent into the well. Next, the drill string is assembled and descends into the well bore as is done in conventional rotary drilling method. Planetary Bur not brought to slaughter at a distance of 9-12 m

On a drill string wrapped around the lead pipe are included in the work mud pumps, drilling mud through the drill string begins to be submitted to the Central shaft 1 and further along the pipe 14 to the turbodrill 5 and bit 13 in the drilled shaft 6 and the slider 8. Drill string and planetary Boer (through its Central shaft 1) begin to rotate the rotary table of the drilling rig with a frequency of 5 to 45 rpm and slowly "served" to the slaughter. Bit 13 is rotated by the shaft 12 of the turbodrill 5 with a frequency of about 300-500 rpm Touching of the face, bit 13 begins to produce the tapered face, the high point of which is the point of intersection 16 of the 20 Central axis of the shaft 1 with the peripheral arms of one of the calibrating roller cones 13. While equipping all of the roller cones 13 only intermittently in contact with the borehole bottom line, forming a downhole cone. In each, separately considered, the time there were cones 13, the axis of which is in projection onto the plane of the USA.

This circumstance on the one hand reduces the sliding arms of the cones on the bottom hole formation, which greatly reduces the specific interaction of the bit from the bottom, on the other hand extends the service life of weapons and supports the cones.

Downhole cone and the slider 8 stabilize in the process of planetary auger - drilling rock bottom-hole - spatial position of the axis 20 of the Central shaft 1. The design of the slider 8, you can bring part of the flow of mud, coming to him through sirleny the barrel 6, very close to the surface of a downhole cone that promotes better treatment from the drilled cuttings. This is very important when drilling shafts of large diameter. In the process of planetary auger is controlled by three main parameters of drilling mode: axial load on the bit 13, the torque on the rotary table of the drilling rig and the discharge pressure of the mud pumps. Drilling continues until you fail bearing part of the roller cones 13. Under constant axial load and performance mud pump time zaklinsky cones on their pivots accompanied by significant growth in the second liquid.

In this case, the drilling stops drill string and planetary auger is extracted from wells; replace worn-out bit 13 on the new; the tool is run into the wellbore and resume drilling.

1. Planetary drill, comprising a lower and an upper head plate, fixed in the above-mentioned traverse the mud motor, the longitudinal axis of which is offset relative to the threaded connection of the planetary drill with a column of drill pipe attached to the shaft of the turbo-drill bit, characterized in that the planetary Bur performed enshrined in the aforementioned traverse and related turbodrill through pipe Central shaft, which is connected by a threaded connection with a column of drill pipe, with a hole for attaching the turbodrill in the lower cross beam is shifted in the radial direction to the longitudinal axis of the Central shaft relative to the hole in which the turbodrill is fixed to the upper cross beam, and the longitudinal axis of the turbodrill is inclined to the axis of the Central shaft at an angle from 30 minutes to 7 degrees, and for the stabilization and centration of the planetary drill along the axis of the wellbore, it has secured in the lower and upper traverse drilled shaft connected with the Central shaft with the ASS="ptx2">

2. Planetary Bur under item 1, characterized in that on the shaft of the turbo-drill fixed a bit, all of the milling cutter which their arms are in contact with the plane perpendicular to the axis of the thread with which it is fastened to the shaft of the turbo-drill.

3. Planetary Bur under item 1, characterized in that the axis of the bearing portion of the axle satellite-runner intersects the axis of the Central shaft at the point where it contacts the peripheral arms of one of the calibrating roller cones attached to the bulk of the turbodrill, while the heads of the pins of the milling cutter satellite-runner are lines that intersect at the same point.

 

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