EP3309357A1 - Tube de forage et tige de forage pour transmettre des signaux acoustiques - Google Patents

Tube de forage et tige de forage pour transmettre des signaux acoustiques Download PDF

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Publication number
EP3309357A1
EP3309357A1 EP16193660.4A EP16193660A EP3309357A1 EP 3309357 A1 EP3309357 A1 EP 3309357A1 EP 16193660 A EP16193660 A EP 16193660A EP 3309357 A1 EP3309357 A1 EP 3309357A1
Authority
EP
European Patent Office
Prior art keywords
drill
drill pipe
section
wall thickness
drill string
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16193660.4A
Other languages
German (de)
English (en)
Inventor
Udo Krüger
Miguel A. Gutierrez
Wilhelm Keusgen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Priority to EP16193660.4A priority Critical patent/EP3309357A1/fr
Priority to PCT/EP2017/072928 priority patent/WO2018068968A1/fr
Publication of EP3309357A1 publication Critical patent/EP3309357A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • E21B47/00—Survey of boreholes or wells
    • E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
    • E21B47/16—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the drill string or casing, e.g. by torsional acoustic waves
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/006—Accessories for drilling pipes, e.g. cleaners
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general

Definitions

  • the present invention relates to a drill pipe capable of transmitting acoustic signals.
  • An acoustic wave based communication system for a drill string is offered by the Canadian company XACT (http://www.xactinc.com/) based on narrow band chirp sequences.
  • the receiver is mounted above the last drill pipe, ie with the communication system, only data can be transmitted when the last drill rod is mounted and optimally only if the drill string is not held with the collet on the drilling table, as the acoustic damping by closing the Collet becomes larger [1] and the quality of the transmission decreases and hence the range.
  • data rates up to 30 bit / s and vertical depths up to 2600 m are achieved (without additional repeater) [2].
  • acoustic communication at low frequencies is greatly affected by the particularly large nonlinearities of the acoustic sources commonly used there and disturbed by the boring noise of a drill head, and at high frequencies communication suffers from the severe material damping of the drill pipes in the drill string.
  • An embodiment according to the invention provides a drill pipe having a first portion having a first wall thickness and a second portion at or adjacent one end of the drill pipe having a second wall thickness and a third portion at or adjacent to the other end of the drill pipe having a third wall thickness that differ from the first wall thickness. Furthermore, the drill pipe is provided to transmit an acoustic signal within a predetermined frequency range, wherein an extension of the second and third sections along the drill pipe is selected depending on a wavelength range of the acoustic signal to be transmitted.
  • Drilling tubes may have a so-called elevation upset, which correspond to the second and third sections located at ends of the drill pipe. These usually have a higher wall thickness than the rest of the drill pipe to ensure mechanical stability. If sections two and three have the same dimensions, a direct connection of several drill pipes is possible, the so-called elevation upset acting as a tool joint in this case and minimizing destructive propagation interference due to reflections at the discontinuities the expansion of the second portion along the drill pipe, so the elevation upsets, depending on a wavelength range of the transmitted acoustic signal advantageous.
  • a signal with a large data rate is transmitted over a large distance, for example via a drill string, which consists of several of the described drill pipes.
  • a maximum constructive interference in the propagation direction corresponds to a maximum destructive interference against the direction of propagation, that is to say a minimal effective reflection.
  • the second and third sections have different dimensions along the drill pipe, in which case the selection of the added dimensions of the second and third sections along the drill pipe is advantageous depending on a wavelength range of the acoustic signal to be transmitted, for example the addition of the expansions half a wavelength of the acoustic signal to be transmitted.
  • the cross-sectional area of the drill pipe material of the second portion is proportional to an acoustic wave resistance of the second portion.
  • a suitable acoustic characteristic impedance can thus be realized.
  • the effective reflection of the acoustic signal can be further reduced.
  • the reduction of the effective reflection also leads to a reduction of the filter effect of the drill pipe, whereby signals are less damped.
  • the second and third sections have a tapered course from the second or third diameter of the second or third section to the first diameter of the first section. Due to the tapering course, the second or third wall thickness is continuously adapted to the first, so that larger jumps in the wall thickness are avoided, resulting in lower reflections.
  • the tapered course is a step-shaped course.
  • a step-shaped course is inexpensive to produce, for example by applying layers of different thickness.
  • the stepped shape allows better handling of the drill pipe by means of a gripping tool.
  • the tapered course is a linear course.
  • a linear course jumps are greatly reduced, and thus also reflections are brought to a minimum.
  • the extent of the second or third section is selected in the region of one quarter of the wavelength of the frequency range of the acoustic signal to be transmitted.
  • the choice of one quarter wavelength expansion is advantageous in order to produce constructive interference in the desired frequency range in the propagation direction that achieves a lower filtering effect, resulting in effectively reduced signal attenuation.
  • the reduced signal attenuation makes it easier to transmit a high data rate over a long channel.
  • the second or third section comprises an attachment which is arranged on the first section and can be fixedly connected to it. This makes it possible to easily adapt an existing pipe to a desired frequency range subsequently.
  • the second or third section is formed integrally with the first section.
  • an outer diameter of the drill pipe in the second or third section is greater than or equal to an outer diameter of the first section.
  • an inner diameter in the second or third section is less than or equal to an inner diameter in the first section.
  • the change in the inner diameter is also advantageous because an outer shape of the drill pipe remains unchanged.
  • a change in the outer diameter can occur along with the described change in the inner diameter.
  • a more flexible choice of the radial drill pipe cross-sectional area in the second or third section is made possible and thus also allows a more flexible adaptation of the acoustic characteristic impedance.
  • the described drill pipe can be well integrated with requirements of the drilling technique, i. For example, the necessary stability can be generated.
  • a drill pipe is provided with a connection element for connection to a further drill pipe, wherein the connection element is formed in the second section or wherein the second section is arranged between the first section and the connection element.
  • the third section is equipped with a matching connecting element.
  • the drill pipe described can be connected by means of the connecting elements with another drill pipe to allow larger drill strings.
  • the second wall thickness of the second portion differs from a third wall thickness of the third portion.
  • the extension of the second section differs from the extension of the third section. This allows differently sized drill pipes to be adjusted for the same frequency range.
  • the drill pipe has the function of an adapter between drill string sections with differently sized drill pipes.
  • the third wall thickness is equal to the second wall thickness and the extent of the third portion is equal to the extent of the second portion.
  • a preferred embodiment according to the invention is a drill string, with a plurality of drill pipes, which are interconnected by means of the connecting elements. Furthermore, the drill string has an acoustic transmitter disposed at one end or adjacent the one end of the drill string. Furthermore, the drill string has an acoustic receiver located at the other end, or at an upper end of the drill string.
  • the described drill string transmits information from the acoustic transmitter, for example in the vicinity of the drill head, to an acoustic receiver which is located, for example, above ground. In this case, the drill string described enables data transmission at high data rates at great depths, or large distances between transmitter and receiver. Furthermore, the transmitters and receivers described can also be designed as transmitting and receiving units in order to enable bidirectional communication.
  • the wall thickness of the connecting elements is greater than the second wall thickness of the second portion and the third wall thickness of the third portion.
  • Another embodiment is a method of transmitting an acoustic signal from a well, comprising the steps of providing a drill string and transmitting the acoustic signal over the drill string.
  • the plurality of drill pipes of the drill string have different lengths and the drill pipes are arranged in any order.
  • the method described may allow a simple use of randomly disposed drill pipes for acoustic data transmission.
  • the length variation of the drill pipes is in the range of ⁇ 0.25 m (for example, drill pipes having lengths between 8.894m and 9.344m). Compliance with the described length variation allows for maximum signal attenuation of the drill string to be avoided or at most achieved.
  • An embodiment according to the invention is an acoustic data transmission system for deep drilling applications with a particularly suitable drill string.
  • Fig. 1 shows a drill pipe 100 according to an embodiment of the invention.
  • the drill pipe 100 has a first wall thickness D 1 115 in a first section 110.
  • the drill pipe 100 has a second wall thickness D 2 124.
  • the extension of the second section 120 along the drill pipe 100 is L eu 2 126 in length.
  • the drill pipe 100 has a third wall thickness D 3 134.
  • the extension of the third section 130 along the drill pipe 100 is equal in length to the length eu3 136.
  • the second and third sections 120, 130 are also referred to as elevation upset, respectively.
  • the expansions L eu2 126 and L eu3 136 are selected as a function of a wavelength ⁇ of the wavelength range of the acoustic signal to be transmitted.
  • these filter losses are thereby reduced because the described selection of the extensions 126 and 136 preferably lead to constructive interference in the frequency range used in the propagation direction, or destructive interferences are avoided, which can lead to a complete suppression of certain frequency ranges.
  • the described wall thicknesses D 2 124 and D 3 134 of the elevation upsets 120, 130 are greater than the wall thickness D 1 115.
  • adaptation here means that, for certain frequency ranges, the discontinuities of the radial cross-sectional area lead to such reflections of the acoustic signal that complete destructive interference occurs opposite the propagation direction.
  • the jumps described arise in the transition between conventional drill pipes and optionally arranged thereon connecting elements Reason for the described different Bewandungsdicken of drill pipe and connecting element.
  • the cross-sectional area of the drill pipe is increased in the area adjacent to which a connector can be attached to produce reflections of an additional reflection site which, for a particular frequency range and superimposed with the remaining reflections, results in destructive interference Lead propagation direction.
  • Fig. 2A shows a schematic representation of a drill pipe 200a, without a second section or elevation upset, on which a connecting element 250, also called tool-joint, is arranged.
  • the connecting element has a larger outer diameter than the drill pipe, whereby at the junction a large jump of the cross-sectional area is formed, which causes reflections of the acoustic signal.
  • Fig. 2B shows a schematic representation of a drill pipe 200b on which a connecting element 250 is arranged, wherein the drill pipe has a conventional elevation upset 210b.
  • the elevation upset 210b introduces some adjustment since the jumps at the drill pipe elevation upset and elevation upset junctions are less than the jump in Fig. 2A , With regard to its extension and thickness, however, the elevation upset 210b is designed so that a good handling of the drill pipe is made possible by a gripping tool, for an improved transmission in the frequency range of the acoustic signal, the elevation upset is not provided and also not designed.
  • Fig. 2C shows a schematic representation of a drill pipe 200c according to an embodiment of the present invention, on which a connecting element 250 is arranged.
  • the drill pipe 200c has an elevation upset 210c whose extension L eu 220 is selected to be one fourth of a wavelength of the wavelength range of the acoustic signal.
  • acoustic wave resistances are proportional to the cross-sectional area of the medium perpendicular to the propagation direction of the wave, and therefore another aspect is the adaptation of the cross-sectional areas to reduce the effective reflection.
  • the described ratio of cross-sectional areas is in Fig. 3 illustrated by the drill pipe 310 and the connecting element 320.
  • the respective radial cross-sectional areas 315 and 325 are shown and depending on the ratio of their surface area the ratio of the acoustic characteristic impedance of Z joint / Z pipe ⁇ 3.5.
  • a value of the ratio near 1 indicates a good fit.
  • Fig. 4A shows a drill string 400a, which consists of a plurality of the described drill pipes 100 or 200c.
  • the drill string 400a is attached to a derrick 410 to make a deep hole.
  • the drill string 400a has a drill head 402, a transmitter unit 404a, which is arranged, for example, adjacent to the drill head 402, and a receiver unit 406a, which is arranged above a drill table 408.
  • the drill table has a pair of pliers that allows the attachment of further drill pipes to the drill string 400a. Between the transmitting unit 404a, there is a unidirectional channel along the drill string via which, by means of acoustic signals, data is sent to the receiving unit 406a.
  • the data of the receiving unit 406a can be transmitted, for example, by radio to a computer 415a. Radio transmission is preferred when the receiving unit 406a is located at an upper end of the drill string 400a since it can rotate in a drilling process.
  • a reliable acoustic channel in a fixed frequency range of the acoustic signal transmitted by the transmitter 404a can be achieved.
  • reflections of the signal which lead to destructive interference in the propagation direction can be avoided.
  • Fig. 4B shows a drill string 400b with the corresponding features of the drill string 400a attached to a derrick 410.
  • the drill string 400b has a transmitting and receiving unit 404b arranged, for example, adjacent to the drill head 402 is.
  • the drill string 400b has a further transmitting and receiving unit 406b, which receives data via the acoustic channel or the drill string 400b from the transmitting and receiving unit 404b.
  • the transmitting and receiving unit 406b can transmit data to the transmitting and receiving unit 404b, thus enabling bidirectional communication.
  • the transmitting and receiving unit 406b is preferably mounted below the drilling table 408 adjacent to the upper end of the drill string 400b, preferably a wired transmission is suitable for transmitting the data to a computer 415b.
  • the wired connection is preferred because the in Fig. 4B Communication preferably takes place when the drill pipe 400b is at rest and is held by the pliers in the drill table 408.
  • a power supply for the transmitting and receiving unit 406b can be provided by means of the cable connection.
  • the transmitting and receiving unit 406b can preferably be used when the drill string is at rest, ie no drilling process takes place, in which case a fail-safe wired transmission is advantageous.
  • a drill string 400c which, in terms of its functionality, represents a combination of the two drill strings 400a and 400b. Both a unidirectional connection by means of the receiving unit 406a and a bidirectional connection by means of the transmitting and receiving unit 406b to the transmitting and receiving unit 404c is hereby possible.
  • the receiving unit 406a and the transmitting and receiving unit 406b enable a combination of the concepts described in FIGS. 4A and 4B have been presented, and communicate accordingly with a computer unit 415c.
  • the drill string 400c described enables a robust reception of data from the transmitting and receiving unit 404a via the unidirectional channel, for example during a drilling process.
  • the bidirectional channel which is used by the transmitting and receiving unit 404b, can be used, for example, to transmit large amounts of data to the transmitting and receiving unit 406b during an interruption of a drilling process.
  • z. B be determined based on the received signals of the underground station 404c.
  • the transmitter is periodically turned off at the underground station 404c and the receiver polled so that, if appropriate commands are sent from the supervisor station 406b and received at the underground station 404c, into the bidirectional mode can be switched. If, on the other hand, no longer any control commands arrive at the underground station 404c during bidirectional operation over a longer period of time, or if other, previously defined criteria are present, for example.
  • B. strong interference signals the underground station 404c switches by itself in the robust, unidirectional mode.
  • the computer unit 415c at the transfer station 406b or 406a can be subject to certain criteria of the received signals (eg type of loading or pilots), which mode is currently being sent by the underground station 404c and using appropriate receive routines. To increase the reliability even further, it is conceivable that important system commands are transmitted in addition to other technologies, eg. B. on the rinse with the mud-pulse telemetry.
  • the range of the communication system will be insufficient.
  • the channel characteristics for acoustic transmission are significantly improved and, in particular, the ranges of the data transmission methods of the systems in FIG Figures 4A-C much bigger.
  • Fig. 5 shows measurements of magnitude frequency responses 500a to 500g of acoustic channels realized via a drill string, for example drill strings 400a-c [1].
  • the length of the drillstring increases from the absolute frequency response 500a, starting at 520 m, to the magnitude frequency response 500g, each by 260 m, thus achieving a maximum drill string length of 2030 m.
  • Measurements of the channel characteristics indicate that the attenuation of the acoustic channel increases with frequency due to material damping, in other words the material of the drill pipe has low pass characteristics.
  • a favorable frequency range for the transmission of data results when the drill string becomes transparent, ie in this frequency range then only its material damping, the filter damping due to its numerous Fabry-Perot resonators, formed by the constantly alternating pipe and tool-joint Is then negligible, with a tool-joint designating a connector and a pipe a drill pipe.
  • Transparency is z. B. achieved when the Fabry-Perot resonators of the shorter, screwed together tool-joint connector (see connecting element 250) are in resonance [5].
  • any frequency range can be adjusted by assuming that the tool joint connectors have a corresponding length (eg ⁇ / 4, ie screwed together ⁇ / 2), which is however too long tool joint connectors, but conceivable for special drill pipes ,
  • the range and bandwidth is not as great as the solution with an additional elevation upset.
  • For a typical drill string without elevation upset corresponding to the second or third section of the drill pipe this is the case in the 5000 Hz to 6000 Hz range. With a typical elevation upset, this resonance is still in this range, but is spectrally wider.
  • An elevation upset refers to a reinforced area behind any tool-joint connector of a drill pipe that allows a more robust handling of the drill pipes.
  • a transmitter which can not produce low frequencies with sufficient acoustic power in the drill pipe and which is particularly nonlinear for smaller frequencies, which makes the quality of transmission deteriorates or makes it impossible.
  • a range of, for example, 500 Hz to 2000 Hz is favorable for acoustic data transmission and it would be advantageous there to produce a transparent, or permeable, area.
  • the elevation upset is dimensioned in a special way, so that even the frequencies at which the drill string becomes transparent can be largely determined and adjusted.
  • Z pipe or Z joint denote the acoustic characteristic impedance of the pipe or joint area.
  • the acoustic wave resistance is approximately proportional to the cross-sectional area of each considered portion of the drill pipe, z.
  • B is the cross-sectional area F eu of the elevation upset approximately proportional to the characteristic impedance Z eu [7].
  • Fig. 6 shows simulated magnitude frequency responses of different drill strings.
  • the magnitude frequency response 600a is characteristic of a drill string formed from drill pipes 200a without elevation upset.
  • the horizontal line 610 identifies a receiver sensitivity or receiver sensitivity, ie frequency portions whose magnitude is below this line can not be received by a receiver.
  • the magnitude frequency response 600a shows no appreciable amount in a frequency range of, for example, 500 Hz to 2000 Hz, which is particularly suitable for data transmission. Frequencies below 500 Hz are less suitable for transmission within a drill string because they are heavily overlaid by drilling noise. Frequencies above 2000 Hz, on the other hand, suffer from too much damping due to the strong material damping of the drill string in order to be used effectively for communication. Therefore, the drill string characterized by magnitude frequency response 600a is less suitable for robust communication.
  • Amount frequency response 600b describes a drill string in which drill pipes 200b having an elevation upset are used, but the elevation upset is not adjusted to the wavelength range corresponding to the frequency range of 500 to 2,000 Hz. This so-called mismatch is manifested by an amplification of the components in the frequency range above 3500 Hz in comparison to the magnitude frequency response 600a.
  • the magnitude frequency response 600c describes a drill string consisting of drill pipes 200c having the described elevation upset.
  • the magnitude response 600c shows that such a drill string has a significant amount greater than the receiver sensitivity 610 in the frequency range of 500 Hz to 2000 Hz. As a result, an acoustic communication over the drill string in the considered frequency range can be ensured.
  • Fig. 7 shows magnitude frequency responses 700a and 700b of different drill strings.
  • the magnitude frequency response 700a characterizes a drill string consisting of drill pipes 710a having an elevation upset whose extent has been chosen according to the wavelength, but whose wall thicknesses are not chosen to be advantageous. As a result, the magnitude response 700a remains in the range of 500 Hz to 2000 Hz below the receiver sensitivity 610.
  • the magnitude frequency responses 720b and 730b in graph 700b characterize drill strings whose drill pipes have elevation upsets which are advantageously chosen neither in length, but in extent or in wall thickness. As a result, in the range from 500 Hz to 2000 Hz, no appreciable amount can be detected above the receiver sensitivity 610, and thus hardly any data transmission in this frequency range can be realized.
  • Fig. 8 shows graphs 800a-c, each showing simulated magnitude frequency responses of different drill strings.
  • the magnitude response 810a in graph 800a characterizes a drill string consisting of drill pipes having elevation upsets at their ends, the drill pipes all having the same length.
  • Magnitude response 820a describes a drill string that differs from the drill string described by magnitude response 810a in that the drill pipes may vary by up to 0.5m and the fasteners by up to 1cm in length.
  • the drill pipes are as described by the magnitude response 820a Drill strand arranged according to their length.
  • the magnitude response 830a describes a drill string corresponding to the drill string described with the magnitude response 820a, with the individual well pipes being disposed in the drill string in disorder with respect to their length.
  • the magnitude response 810a has the largest portion above the receiver sensitivity 610. Furthermore, the sorted drill string described by the magnitude response 820a also provides a significant proportion in the range of 500 Hz to 2000 Hz over the receiver sensitivity 610. The drill string with unsorted well tubes described by the magnitude response 830a offers only a small spectral range in which the Amount is greater than the recipient sensitivity 610. In summary, a better channel characteristic can be achieved by sorting conventional drill pipes.
  • Graph 800b includes magnitude frequency responses 810b, 820b, and 830b that are analogous to magnitude frequency responses 810a, 820a, and 830a.
  • the described drill strings differ only in that the drill pipes used have elevation upsets adapted to the frequency range from 500 Hz to 2000 Hz corresponding to drill pipe 200c.
  • the magnitude frequency responses 810b, 820b and 830b offer a similar transmission characteristic in the frequency range of 500 Hz to 2000 Hz.
  • a drill string consisting of the drill pipes 200c described does not require sorting of the drill pipes by length in order to have an advantageous transfer characteristic.
  • magnitude frequency responses 810c, 820c, and 830c are plotted.
  • the magnitude frequency responses 810c, 820c, and 830c are analogous to the magnitude frequency responses 810b, 820b, and 830b, where the total drill string length has been doubled.
  • the overall attenuation of the channel increases by about 60 dB, whereby only a transmission with low data rate is possible in the considered range of 500 Hz to 2000 Hz.
  • Fig. 9 10 shows a drill pipe 900 that corresponds to the drill pipe 100 and that additionally has fasteners 922 and 932 at the ends of the pipe 100 that are adjacent to the elevation upsets 120 and 130.
  • the elevation upsets 120 and 130 are selected so that their acoustic impedance is equal to the square root of the product of the characteristic impedances of the first section 110 and the connecting element 922 or 932.
  • the connecting element 922 has an internal thread and the connecting element 932 has an external thread.
  • the drill pipe 900 provides the opportunity for a particular frequency range to avoid or suppress the generation of reflections at both ends of the drill pipe.
  • FIG. 10A-D schematic longitudinal sections of different drill pipes according to embodiments of the present invention are shown. Only one connection side is shown. Any mixture of the various embodiments on the two sides is possible and corresponds to an adapter.
  • Fig. 10A shows a schematic cross section of a drill pipe 1000a, which has a first portion 110 and a second portion 1020a. Furthermore, the first portion 110 has a wall thickness D 1 which is smaller than the wall thickness D 2 of the second portion 1020 a and the second portion 1020 a has a smaller inner diameter d 2 than the first portion 110 with d 1 . Furthermore, the second portion 1020a has an extension along the drill pipe 1000a, which corresponds to a quarter of the wavelength of the acoustic signal to be transmitted. By the described embodiment, a desired adjustment can be achieved without changing the outer shape of the drill pipe.
  • Fig. 10B shows a schematic cross section of a drill pipe 1000b corresponding to the drill pipe 1000a, wherein the second portion 1020b compared to the second portion 1020a of the drill pipe 1000a has an enlarged outer diameter.
  • the described embodiment is advantageous for distributing an area increase on the inside and the outside of the drill pipe 1000b.
  • FIG. 12 shows a schematic cross section of a drill pipe 1000c corresponding to the drill pipe 100.
  • the second section of the drill pipe 1020c of the drill pipe 1000c has a step-shaped tapered course from the wall thickness D 2 of the second section 1020c to the wall thickness D 1 of the first section 110.
  • the described embodiment is advantageous because jumps in the wall thickness are reduced by the stepped course, additionally generated interference can be used to improve the adaptation, and good handling of the drill pipe is ensured for a gripping tool.
  • the lengths and heights of the stages can be set according to different criteria, e.g. For example, according to Chebyshev, polynomials to further optimize the transition.
  • Fig. 10D 12 shows a schematic cross section of a drill pipe 1000d corresponding to the drill pipe 100.
  • the second section of the drill pipe 1020d of the drill pipe 1000d has a linearly tapered course from the wall thickness D 2 of the second section 1020d to the wall thickness D 1 of the first section.
  • the described embodiment reduces jump points to a minimum which also reflections can be strongly damped or avoided altogether.
  • other functional relationships for the course of the characteristic impedance can be advantageous, for. For example, an exponential history that can be used to increase the bandwidth even further.
  • the bandwidth for the acoustic transmission can be further increased. In the limiting case, a continuous transition would then result.
  • the length and width of the elevation upset can be chosen as close as possible to the optimal values, since then the best acoustic transmission is to be expected under these circumstances.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Acoustics & Sound (AREA)
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EP16193660.4A 2016-10-13 2016-10-13 Tube de forage et tige de forage pour transmettre des signaux acoustiques Withdrawn EP3309357A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16193660.4A EP3309357A1 (fr) 2016-10-13 2016-10-13 Tube de forage et tige de forage pour transmettre des signaux acoustiques
PCT/EP2017/072928 WO2018068968A1 (fr) 2016-10-13 2017-09-12 Tige de forage et train de tiges pour transmettre des signaux acoustiques

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EP16193660.4A EP3309357A1 (fr) 2016-10-13 2016-10-13 Tube de forage et tige de forage pour transmettre des signaux acoustiques

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3252225A (en) * 1962-09-04 1966-05-24 Ed Wight Signal generator indicating vertical deviation
US5128901A (en) * 1988-04-21 1992-07-07 Teleco Oilfield Services Inc. Acoustic data transmission through a drillstring
US5283768A (en) * 1991-06-14 1994-02-01 Baker Hughes Incorporated Borehole liquid acoustic wave transducer
WO2016108881A1 (fr) * 2014-12-31 2016-07-07 Halliburton Energy Services, Inc. Structure de tige de forage à grande largeur de bande pour télémétrie acoustique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3252225A (en) * 1962-09-04 1966-05-24 Ed Wight Signal generator indicating vertical deviation
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