EP1117894B2 - Trepans a cones, systemes de forage, procedes de forage et procedes de conception presentant une orientation des dents optimisee - Google Patents

Trepans a cones, systemes de forage, procedes de forage et procedes de conception presentant une orientation des dents optimisee Download PDF

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Publication number
EP1117894B2
EP1117894B2 EP99945376A EP99945376A EP1117894B2 EP 1117894 B2 EP1117894 B2 EP 1117894B2 EP 99945376 A EP99945376 A EP 99945376A EP 99945376 A EP99945376 A EP 99945376A EP 1117894 B2 EP1117894 B2 EP 1117894B2
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Prior art keywords
cone
tooth
bit
teeth
row
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EP99945376A
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German (de)
English (en)
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EP1117894A2 (fr
EP1117894B1 (fr
EP1117894A4 (fr
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Shilin Chen
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Halliburton Energy Services Inc
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Halliburton Energy Services Inc
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Priority to EP04025560A priority Critical patent/EP1500781A3/fr
Priority to EP04025232A priority patent/EP1498572A3/fr
Priority to EP03021139A priority patent/EP1371811B1/fr
Priority to EP04025561A priority patent/EP1500782A3/fr
Priority to EP04025562A priority patent/EP1500783A3/fr
Application filed by Halliburton Energy Services Inc filed Critical Halliburton Energy Services Inc
Publication of EP1117894A2 publication Critical patent/EP1117894A2/fr
Publication of EP1117894A4 publication Critical patent/EP1117894A4/fr
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E21B10/16—Roller bits characterised by tooth form or arrangement

Definitions

  • roller cone bit an example of which is seen in Figure 11 .
  • a set of cones 16 two are visible
  • teeth or cutting inserts 18 are arranged on rugged bearings on the arms of the bit.
  • the second type of drill bit is a drag bit, having no moving parts, seen in Figure 12 .
  • Drag bits are becoming increasingly popular for drilling soft and medium formations, but roller cone bits are still very popular, especially for drilling medium and medium-hard rock.
  • roller cone bits There are various types of roller cone bits: insert-type bits, which are normally used for drilling harder formations, will have teeth of tungsten carbide or some other hard material mounted on their cones. As the drill string rotates, and the cones roll along the bottom of the hole, the individual hard teeth will induce compressive failure in the formation.
  • the bit's teeth must crush or cut rock, with the necessary forces supplied by the "weight on bit” (WOB) which presses the bit down into the rock, and bv the torque applied at the rotary drive. While the WOB may in some cases be 100,000 pounds (39,400 kg) or more, the forces actually seen at the drill bit are not constant: the rock being cut may have harder and softer portions (and may break unevenly), and the drill string itself can oscillate in many different modes. Thus the drill bit must be able to operate for long periods under high stresses in a remote environment.
  • WOB weight on bit
  • the oscillations are damped somewhat by the drilling mud, or by friction where the drill pipe rubs against the walls, or by the energy absorbed in fracturing the formation: but often these sources of damping are not enough to prevent oscillation. Since these oscillations occur down in the wellbore, they can be hard to detect, but they are generally undesirable. Drill string oscillations change the instantaneous force on the bit, and that means that the bit will not operate as designed. For example, the bit may drill oversize, or off-center, or may wear out much sooner than expected. Oscillations are hard to predict, since different mechanical forces can combine to produce "coupled modes"; the problems of gyration and whirl are an example of this.
  • the "cones" in a roller cone bit need not be perfectly conical (nor perfectly frustroconical), but often have a slightly swollen axial profile. Moreover, the axes of the cones do not have to intersect the centerline of the borehole. (The angular difference is referred to as the "offset" angle.) Another variable is the angle by which the centerline of the bearings intersects the horizontal plane of the bottom of the hole, and this angle is known as the journal angle. Thus as the drill bit is rotated, the cones typically do not roll true, and a certain amount of gouging and scraping takes place. The gouging and scraping action is complex in nature, and varies in magnitude and direction depending on a number of variables.
  • roller cone bits can be divided into two broad categories: Insert bits and steel-tooth bits. Steel tooth bits are utilized most frequently in softer formation drilling, whereas insert bits are utilized most frequently in medium and hard formation drilling.
  • Steel-tooth bits have steel teeth formed integral to the cone.
  • a hardmetal is typically applied to the surface of the teeth to improve the wear resistance of the structure.
  • Insert bits have very hard inserts (e.g. specially selected grades of tungsten carbide) pressed into holes drilled into the cone surfaces. The inserts extend outwardly beyond the surface of the cones to form the "teeth" that comprise the cutting structures of the drill bit.
  • the design of the component elements in a rock bit are interrelated (together with the size limitations imposed by the overall diameter of the bit), and some of the design parameters are driven by the intended use of the product. For example, cone angle and offset can be modified to increase or decrease the amount of bottom hole scraping. Many other design parameters are limited in that an increase in one parameter may necessarily result in a decrease of another. For example, increases in tooth length may cause interference with the adjacent cones.
  • the teeth of steel tooth bits are predominantly of the inverted "V" shape.
  • the included angle i.e. the sharpness of the tip
  • the length of the tooth will vary with the design of the bit. In bits designed for harder formations the teeth will be shorter and the included angle will be greater.
  • Gage row teeth i.e. the teeth in the outermost row of the cone, next to the outer diameter of the borehole
  • inserts The most common shapes of inserts are spherical, conical, and chisel.
  • Spherical inserts have a very small protrusion and are used for drilling the hardest formations.
  • Conical inserts have a greater protrusion and a natural resistance to breakage, and are often used for drilling medium hard formations.
  • Chisel shaped inserts have opposing flats and a broad elongated crest, resembling the teeth of a steel tooth bit. Chisel shaped inserts are used for drilling soft to medium formations.
  • the elongated crest of the chisel insert is normally oriented in alignment with the axis of cone rotation.
  • the chisel insert may be directionally oriented about its center axis. (This is true of any tooth which is not axially symmetric.) The axial angle of orientation is measured from the plane intersecting the center of the cone and the center of the tooth.
  • Soft formations were originally drilled with "fish-tail" drag bits, which sheared the formation away.
  • Roller cone bits designed for drilling soft formations are designed to maximize the gouging and scraping action. To accomplish this, cones are offset to induce the largest allowable deviation from rolling on their true centers. Journal angles are small and cone-profile angles will have relatively large variations. Teeth are long, sharp, and widely-spaced to allow for the greatest possible penetration. Drilling in soft formations is characterized by low weight and high rotary speeds.
  • Hard formations are drilled by applying high weights on the drill bits and crushing the formation in compressive failure. The rock will fail when the applied load exceeds the strength of the rock. Roller cone bits designed for drilling hard formations are designed to roll as close as possible to a true roll, with little gouging or scraping action. Offset will be zero and journal angles will be higher. Teeth are short and closely spaced to prevent breakage under the high loads. Drilling in hard formations is characterized by high weight and low rotary speeds.
  • Medium formations are drilled by combining the features of soft and hard formation bits.
  • the rock breaks away (is failed) by combining compressive forces with limited shearing and gouging action that is achieved by designing drill bits with a moderate amount of offset. Tooth length is designed for medium extensions as well. Drilling in medium formations is most often done with weights and rotary speeds between that of the hard and soft formations. Area drilling practices are evaluated to determine the optimum combinations.
  • bit lateral vibration which can be caused by radial force imbalances, bit mass imbalance, and bit/formation interaction among other things.
  • This condition includes directional reversals and gyration about the hole center often known as whirl. Lateral vibration results in poor bit performance, overgage hole drilling, out-of-round, or "lobed" wellbores, and premature failure of both the cutting structures and bearing systems of bits.
  • roller cone bit designs remain the result of generations of modifications made to original designs.
  • the modifications are based on years of experience in evaluating bit records, dull bit conditions, and bottom hole patterns.
  • each cone On the outermost rows of each cone, the teeth are encountering impressions in the formation left by teeth on other cones.
  • the staggered teeth are just as likely to track an impression as any other tooth.
  • Another disadvantage to staggered designs is that they may cause fluctuations in cone rotational speed, resulting in fluctuations in tooth impact force and increased bit vibration. Bit vibration is very harmful to the life of the bit and the life of the entire drill string.
  • Estes discloses a roller cone bit having opposite angular axial orientation of chisel shaped inserts in the first and second rows of a cone.
  • This invention is premised on the determination that inserts scrape diagonally inboard and either to the leading side (facing in the direction of rotation) or to the trailing side (facing opposite to the direction of rotation). It is noted that the heel row inserts engage the formation to the leading side, while the second row inserts engage the formation to the trailing edge.
  • the inserts in the heel row are axially oriented at an angle between 30 degrees and 60 degrees, while the inserts in the second row are axially oriented between 300 degrees and 330 degrees.
  • This orientation is designed to provide the inserts with a higher resistance to breakage.
  • the inserts in the heel row are oriented at an axial angle between 300 degrees and 330 degrees, while the inserts in the second row are axially oriented between 30 degrees and 60 degrees.
  • This orientation is designed to provide the inserts with a broader contact area with the formation for increased formation removal, and thereby an increased rate of penetration of the drill bit into the formation.
  • US-A-5 372 210 discloses a roller cone bit comprising a bit body member carrying a plurality of roller cones each provided with cutting inserts located in circumferential rows. These rows include at least one bottom cutting row of maximum cutting diameter c, at least one gauge cutting row of gauge cutting diameter d, smaller than diameter c, and at least one transition row of intermediate cutting diameter t, smaller than diameter c and greater than diameter d, each row of cutting inserts having a respective cutting tip.
  • the bottom cutting, gauge cutting, and transition rows of cutting inserts being arranged such that h'/y' is greater than h/y, where: h is the distance from the cutting tip of the gauge row of diameter d to the cutting tip of the bottom cutting row of diameter c, measured parallel to the longitudinal axis of the bit body member, y is the distance from the cutting tip of the gauge row of diameter d to the cutting tip of the bottom cutting row of diameter c, measured perpendicular to the body member longitudinal axis, h' is the distance from the cutting tip of the transition row of diameter t to the cutting tip of the gauge row of diameter d, measured parallel to the body member longitudinal axis, and y' is the distance from the cutting tip of the transition row of diameter t to the cutting tip of the gauge row of diameter d, measured perpendicular to the body member longitudinal axis.
  • the stated requirement for the selected ratios serves for determining the roundness of the comers of the borehole in such manner as to improve the ability of the bit to drill curved
  • a method of designing a roller cone bit comprising the steps of: adjusting the orientation of at least one tooth on a cone, in dependence on an expected trajectory of said tooth through formation material at the cutting face, in dependence on an estimated ratio of cone rotation to bit rotation for which the torques acting on the cone about its axis sum to zero; recalculating said ratio, if the location of any row of teeth on said cone changes during optimization; recalculating the trajectory of said tooth in accordance with a recalculated value of said cone speed; and adjusting the orientation of said tooth again, in accordance with a recalculated value of said tooth trajectory.
  • Embodiments of the invention will be described below in which tooth orientation is optimized jointly with other parameters, using software which graphically displays the linearized trajectory of each tooth row, as translated onto the surface of the cone.
  • the speed ratio of each cone is precisely calculated, as is the curved trajectory of each tooth through the formation.
  • linear approximations to the tooth trajectory are preferably displayed.
  • roller cone drill bit design methods and optimizations which can be used separately from or in synergistic combination with the methods disclosed in the present application. That application, which has common ownership, inventorship, and effective filing date with the present application, is filed 31 August 1999, entitled “Force-Balanced Roller-Cone Bits, Systems, Drilling Methods, and Design Methods" (atty. docket no. SC-9825), claiming priority from U.S. provisional application no. 60/098,466 filed 31 August 1998 .
  • Figures 1A-1C show a sample embodiment of a bit design process, using the teachings of the present application. Specifically, Figure 1A shows an overview of the design process, and Figures 1B and 1C expand specific parts of the process.
  • bit geometry is input (step 102 ).
  • bit layout is displayed (step 104 ).
  • transformation matrices from cone to bit coordinates must be calculated (step 106 ).
  • step 106 The number of bit revolutions is input (step 108 ), and each cone is counted (step 110 ), followed by each row of teeth for each cone (step 112 ).
  • step 114 the type of teeth of each row is identified (step 114 ), and the teeth are counted (step 116 ).
  • step 118 a time interval delta is set (step 118 ), and the position of each tooth is calculated at this time interval (step 120 ).
  • step 122 If a given tooth is not "cutting" (i.e., in contact with the hole bottom), then the algorithm continues counting until a cutting tooth is reached (step 122 ).
  • the tooth trajectory, speed, scraping distance, crater distribution, coverage ratio and tracking ratios for all rows, cones, and the bit are calculated (step 124 ).
  • This section of the process gives the teeth motion over the hole bottom, and displays the results (step 126 ).
  • bit mechanics are calculated. (See Figure 1C . ) Again transformation matrices from cone to bit coordinates are calculated (step 128 ), and the number of bit revolutions and maximum time steps, delta, are input (step 130 ). The cones are then counted (step 132 ), the bit and cone rotation angles are calculated at the given time step (step 134 ), and the rows are counted (step 136 ). Next, the 3D tooth surface matrices for the teeth on a given row are calculated (step 138 ). The teeth are then counted (step 140 ), and the 3D position of the tooth on the hole bottom is calculated at the given time interval (step 142 ). If a tooth is not cutting, counting continues until a cutting tooth is reached (step 144 ).
  • the cutting depth, area, volume and forces for each tooth are calculated, and the hole bottom model is updated (based on the crater model for the type of rock being drilled). Next the number of teeth cutting at any given time step is counted. The tooth force is projected into cone and bit coordinates, yielding the total cone and bit forces and moments. Finally the specific energy of the bit is calculated (step 146 ).
  • Figure 13 shows a sample XYZ plot of a tooth tip (in tooth local coordinates). Tooth coordinates will be indicated here by the subscript t. (Of course, each tooth has its own tooth coordinate system.) The center of the X t Y t Z t coordinate system, in the presently preferred embodiment, is located at the tooth center. The coordinate of a tooth's crest point P t will be defined by parameters of the tooth profile (e.g. tooth diameter, extension, etc.).
  • Figure 14 shows axial and sectional views of the i-th cone, and illustrates the enumeration of rows and teeth.
  • Cone coordinates will be indicated here by the subscript c.
  • the center of the cone coordinates is located in the center of backface of the cone.
  • the cone body is fixed with respect to these coordinates, and hence THESE COORDINATES ROTATE WITH THE CONE. (Of course, each cone has its own cone coordinate system.)
  • the axis Z c coincides with the cone axis, and is oriented towards to the bit center.
  • Cone axes Y c and X c together with axis Z c , follow the right hand rule.
  • H c , R c , ⁇ c and ⁇ c are the same.
  • a set of bit axes X b Y b Z b is aligned to the bit.
  • the bit is fixed with respect to these coordinates, and hence THESE COORDINATES ROTATE WITH THE BIT.
  • Axis Z b preferably points toward the cutting face, and axes X b and Y b are normal to Z b (and follow the right-hand rule).
  • FIG. 1 The simplest coordinate system is defined by the hole axes X h Y h Z h , which are fixed in space. Note however that axes Z b and Z h may not be coincident if the bit is tilted.
  • Figure 2 shows the tangential and radial velocity components of tooth trajectory, viewed through the cutting face (i.e. looking up). Illustrated is a small portion of a tooth trajectory, wherein a tooth's crest (projected into an X h Y h plane which approximates the bottom of the hole) moves from point A to point B, over an arc distance ds and a radial distance dr.
  • the plane X c O c Z c is parallel to the bit axis.
  • the cone has a rotation angle ⁇ around its negative axis (-Z c ). Any point on the cone moves to a new position due to this rotation.
  • the new position of P c in X c Y c Z c can be determined by combining linear transforms.
  • R cone cos ⁇ ⁇ l + 1 - cos ⁇ ⁇ NcNc ⁇ + sin ⁇ ⁇ Mc , where N c is the rotation vector and M c is a 3*3 matrix defined by N c .
  • the formation is modeled, in the presently preferred embodiment, by multiple stepped horizontal planes. (The number of horizontal planes depends on the total number of rows in the bit.) In this way, the trajectory of any tooth on hole bottom can be determined.
  • Figures 3A, 3B , 3C , and 3D show plots of planar tooth trajectories, referenced to the hole coordinates X h Y n , for teeth on four different rows of a particular roller cone bit.
  • the teeth on the outermost row (first row) scrapes toward the leading side of the cone. Its radial and tangential scraping distances are similar, as can be seen by comparing the first bar in Figure 4A with the first bar in Figure 4B .
  • the radial scraping motion is much larger than the tangent motion.
  • the teeth on the third row scrape toward the trailing side of the cone, and the teeth on the forth row scrape toward the leading side of the cone.
  • Figures 4A and 4B show per-bit-revolution tangential and radial distances, respectively, for the four tooth trajectories shown in Figures 3A-3D . Note that, in this example, the motion of the second row is almost entirely radial, and not tangential.
  • the tooth trajectories described above are projected on the hole bottom which is fixed in space. In this way it is clearly seen how the tooth scrapes over the bottom.
  • the teeth orientation angle on the cone coordinate in order either to keep the elongate side of the tooth perpendicular to the scraping direction (for maximum cutting rate in softer formations) or to keep the elongate side of the tooth in line with the scraping direction (for durability in harder formations).
  • the tooth trajectories are projected to the cone coordinate system.
  • roller cone design There are numerous parameters in roller cone design, and experienced designers already know, qualitatively, that changes in cone shape (cone angle, heel angle, third angle, and oversize angle) as well as offset and journal angle will affect the scraping pattern of teeth in order to get a desired action-on-bottom.
  • One problem is that it is not easy to describe a desired action-on-bottom quantitatively.
  • the present application provides techniques for addressing this need.
  • the arcuate (or bulged) shape of the cone primarily affects the ETSD value, and the offset determines the ERSD value.
  • the ERSD is not equal to zero even at zero offset. In other words, the teeth on a bit without offset may still have some small radial scraping effects.
  • the radial scraping direction for all teeth is always toward to the hole center (positive). However, the tangential scraping direction is usually different from row to row.
  • the leading side of the elongated teeth crest should be orientated at an angle to the plane of the cone's axis, which is calculated as described above for any given row.
  • Figure 2 shows the procedure in which a tooth cuts into (point A) and out (point B) the formation. Due to bit offset, arcuate cone shape and bit and cone rotations, the motion from A to B can be divided into two parts: tangent motion ds and radial motion dr. Notice the tangent and radial motions are defined in hole coordinate system XhYh. Because ds and dr vary from row to row and from cone to cone, we derive an equivalent tangent scraping distance (ETSD) and an equivalent radial scraping distance (ERSD) for a whole cone (or for an entire bit).
  • ESD equivalent tangent scraping distance
  • ERSD equivalent radial scraping distance
  • Figures 15A-15D show how the planarized tooth trajectories vary as the offset is increased. These figures clearly show that with the increase of the offset value, the radial scraping distance is increased. Surprisingly, the radial scraping distance is not equal to zero even if the offset is zero. This is due to the arcuate shape of the cone.
  • Figures 16A-16D show how the ERSD and ETSD values vary for all rows of a given cone as offset is increased. From these Figures, it can be seen that the tangent scraping distance of the gage row, while very small compared to other rows but is not equal to zero. It means that there is a sliding even for the teeth on the driving row. This fact may be explained by looking at the tangent speed during the entry and exit of teeth into and out of the rock. ( Figure 6 shows time-domain plots of tooth tangential speed, for the five rows of a sample cone, over the duration of the trajectory for each row.) During the cutting procedure the tangent speed is not equal to zero except for one instant. Because the sliding speed changes with time, the instantaneous speed is not the best way to describe the teeth/rock interaction.
  • Figure 5 is a sectional view of a cone (normal to its axis), showing how the tooth orientation is defined in the present application: the positive direction is defined as the same direction as the bit rotation. This means that the leading side of tooth on one row may be different from that on another row.
  • the ERSD increases almost proportionally with the increase of the bit offset. However, ERSD is not zero even if the bit offset is zero. This is because the radial sliding speed is not always zero during the procedure of tooth cutting into and cutting out the rock.
  • Figures 7A and 7B show how optimization of tooth orientation can perturb the width of uncut rings on the hole bottom.
  • the width of uncut rings is one of the design constraints: a sufficiently narrow uncut ring will be easily fractured by adjacent cutter action and mud flows, but too large an uncut ring will slow rate of penetration.
  • tooth orientation should not be adjusted in isolation, but preferably should be optimized jointly with the width of uncut rings.
  • Figures 9A , 9B and 9C show the screen views which a skilled bit designer would see, according to some embodiments of the invention, while working on a bit optimization which included optimization of tooth orientation. These three views show representations of tooth orientation and scraping direction for each tooth row on each of the three cones. This simple display allows the designer to get a feel for the effect of various parameter variations
  • the present application also teaches that the ratio between the rotational speeds of cone and bit can be easily checked, in the context of the detailed force calculations described above, simply by calculating the torques about the cone axis. If these torques sum to zero (at a given ratio of cone and bit speed), then the given ratio is correct. If not, an iterative calculation can be performed to find the value of this ratio.
  • Drag bit a drill bit with no moving parts that drills by intrusion and drag.
  • Mud the liquid circulated through the wellbore during rotary drilling operations, also referred to as drilling fluid.
  • drilling fluid Originally a suspension of earth solids (especially clays) in water, modem "mud" is a three-phase mixture of liquids, reactive solids, and inert solids.
  • Nozzle in a passageway through which the drilling fluid exits a drill bit, the portion of that passageway which restricts the cross-section to control the flow of fluid.
  • Orientation the angle of rotation with which a non-axisymmetric tooth is inserted into a cone.
  • a tooth which is axisymmetric e.g. one having a hemispherical tip
  • Roller cone bit a drilling bit made of two, three, or four cones, or cutters, that are mounted on extremely rugged bearings. Also called rock bits.
  • the surface of each cone is made up of rows of steel teeth (generally for softer formations) or rows of hard inserts (typically of tungsten carbide) for harder formations.
  • the various teachings can optionally be adapted to two-cone or four-cone bits.
  • the orientations of teeth can be perturbed about the optimal value, to induce variation between the gage rows of different cones (or within an inner row of a single cone), to provide some additional resistance to tracking.
  • bit will also normally contain many other features besides those emphasized here, such as gage buttons, wear pads, lubrication reservoirs, etc. etc.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
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  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (3)

  1. Un procédé de conception d'un trépan à cônes, comprenant les étapes consistant à :
    - ajuster l'orientation d'au moins une dent sur un cône, de manière dépendante d'une trajectoire attendue de ladite dent à travers un matériau de formation du côté de la face tranchante, de manière dépendante d'un rapport estimé entre la rotation du cône et la rotation de la lame pour lequel les force de torsion agissant sur le cône autour de son axe s'additionnement ent à zéro;
    - recalculer ledit rapport, si l'emplacement d'une quelconque rangée de dents sur ledit cône change pendant l'optimisation ;
    - recalculer la trajectoire de ladite dent en conformité avec une valeur recalculée de ladite vitesse du cône ; et
    - ajuster à nouveau l'orientation de ladite dent, en conformité avec une valeur recalculée de ladite trajectoire de la dent.
  2. Une méthode selon la revendication 1, dans laquelle toutes lesdites étapes sont réitérées.
  3. Une méthode selon la revendication 1, dans laquelle chaque dent sur ladite lame est non symétrique axialement.
EP99945376A 1998-08-31 1999-08-31 Trepans a cones, systemes de forage, procedes de forage et procedes de conception presentant une orientation des dents optimisee Expired - Lifetime EP1117894B2 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP04025232A EP1498572A3 (fr) 1998-08-31 1999-08-31 Trépans à cônes, systèmes de forage, procédés de forage et procédés de conception présentant une orientation des dents optimisées
EP03021139A EP1371811B1 (fr) 1998-08-31 1999-08-31 Trépan à cônes, procédé pour sa conception et système de forage rotatif
EP04025561A EP1500782A3 (fr) 1998-08-31 1999-08-31 Procédé de conception d'un trépan à molettes
EP04025562A EP1500783A3 (fr) 1998-08-31 1999-08-31 Procédé de conception d'un trépan à molettes
EP04025560A EP1500781A3 (fr) 1998-08-31 1999-08-31 Procédé de conception d'un trépan à molettes

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US9844298P 1998-08-31 1998-08-31
US98442P 1998-08-31
PCT/US1999/019992 WO2000012860A2 (fr) 1998-08-31 1999-08-31 Trepans a cones, systemes de forage, procedes de forage et procedes de conception presentant une orientation des dents optimisee

Related Child Applications (6)

Application Number Title Priority Date Filing Date
EP03021139A Division EP1371811B1 (fr) 1998-08-31 1999-08-31 Trépan à cônes, procédé pour sa conception et système de forage rotatif
EP03021139.5 Division-Into 2003-09-22
EP04025232.2 Division-Into 2004-10-22
EP04025562.2 Division-Into 2004-10-27
EP04025560.6 Division-Into 2004-10-27
EP04025561.4 Division-Into 2004-10-27

Publications (4)

Publication Number Publication Date
EP1117894A2 EP1117894A2 (fr) 2001-07-25
EP1117894A4 EP1117894A4 (fr) 2002-08-14
EP1117894B1 EP1117894B1 (fr) 2003-12-03
EP1117894B2 true EP1117894B2 (fr) 2010-03-03

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Application Number Title Priority Date Filing Date
EP99945376A Expired - Lifetime EP1117894B2 (fr) 1998-08-31 1999-08-31 Trepans a cones, systemes de forage, procedes de forage et procedes de conception presentant une orientation des dents optimisee
EP03021139A Expired - Lifetime EP1371811B1 (fr) 1998-08-31 1999-08-31 Trépan à cônes, procédé pour sa conception et système de forage rotatif
EP04025232A Withdrawn EP1498572A3 (fr) 1998-08-31 1999-08-31 Trépans à cônes, systèmes de forage, procédés de forage et procédés de conception présentant une orientation des dents optimisées
EP04025560A Withdrawn EP1500781A3 (fr) 1998-08-31 1999-08-31 Procédé de conception d'un trépan à molettes
EP04025561A Withdrawn EP1500782A3 (fr) 1998-08-31 1999-08-31 Procédé de conception d'un trépan à molettes
EP04025562A Withdrawn EP1500783A3 (fr) 1998-08-31 1999-08-31 Procédé de conception d'un trépan à molettes

Family Applications After (5)

Application Number Title Priority Date Filing Date
EP03021139A Expired - Lifetime EP1371811B1 (fr) 1998-08-31 1999-08-31 Trépan à cônes, procédé pour sa conception et système de forage rotatif
EP04025232A Withdrawn EP1498572A3 (fr) 1998-08-31 1999-08-31 Trépans à cônes, systèmes de forage, procédés de forage et procédés de conception présentant une orientation des dents optimisées
EP04025560A Withdrawn EP1500781A3 (fr) 1998-08-31 1999-08-31 Procédé de conception d'un trépan à molettes
EP04025561A Withdrawn EP1500782A3 (fr) 1998-08-31 1999-08-31 Procédé de conception d'un trépan à molettes
EP04025562A Withdrawn EP1500783A3 (fr) 1998-08-31 1999-08-31 Procédé de conception d'un trépan à molettes

Country Status (5)

Country Link
EP (6) EP1117894B2 (fr)
AU (1) AU5798499A (fr)
ID (1) ID28893A (fr)
MX (1) MXPA01002208A (fr)
WO (1) WO2000012860A2 (fr)

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Also Published As

Publication number Publication date
EP1500781A3 (fr) 2006-04-12
EP1500783A3 (fr) 2006-04-12
WO2000012860A3 (fr) 2000-06-08
ID28893A (id) 2001-07-12
WO2000012860A9 (fr) 2000-11-23
EP1498572A3 (fr) 2006-04-12
AU5798499A (en) 2000-03-21
EP1498572A2 (fr) 2005-01-19
MXPA01002208A (es) 2003-03-27
EP1117894A2 (fr) 2001-07-25
EP1500783A2 (fr) 2005-01-26
EP1371811A2 (fr) 2003-12-17
EP1371811A3 (fr) 2004-01-02
WO2000012860A2 (fr) 2000-03-09
EP1371811B1 (fr) 2011-03-30
EP1117894B1 (fr) 2003-12-03
EP1500782A3 (fr) 2006-04-12
EP1117894A4 (fr) 2002-08-14
EP1500782A2 (fr) 2005-01-26
EP1500781A2 (fr) 2005-01-26

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