EP2820228A2

EP2820228A2 - Drill pipe

Info

Publication number: EP2820228A2
Application number: EP13711563.0A
Authority: EP
Inventors: Anton Scheibelmasser; Bouchra Lamik-Thonhauser; Anton KOTOV; Michael KORAK; Johann JUD; Manfred GUTSCHELHOFER; Alexander FINE
Original assignee: think and vision GmbH
Current assignee: THINK AND VISION GmbH
Priority date: 2012-03-01
Filing date: 2013-02-25
Publication date: 2015-01-07
Anticipated expiration: 2033-02-25
Also published as: AT512604A1; US20150041216A1; PL2820228T3; EP2820228C0; ES2962569T3; EP2820228B1; AU2013225601B2; WO2013126936A2; US10060194B2; BR112014021271B1; CA2865909A1; BR112014021271A2; WO2013126936A3; AT512604B1; CA2865909C; AU2013225601A1; AU2013225601A8

Abstract

A drill pipe (1), particularly for a drill string, has at least one electrical conductor (4, 7, 8, 9) and an inner pipe (2) which is arranged inside the drill pipe (1). The drill pipe (1) and the inner pipe (2) are spaced at a distance to one another in sections, wherein the drill pipe (1) and inner pipe (2) bound a hollow space (3). At least one electrical conductor (4, 7, 8, 9) is arranged on one outer side of the inner pipe.

Description

drill pipe

The invention relates to a drill pipe, in particular for a drill string, with at least one electrical conductor and an inner tube, which is arranged within the drill pipe.

An essential element in modern petroleum, natural gas or

Geothermal wells is the data collection during the

Drilling Operation ("Measurement While Drilling" (MWD), "Logging While Drilling" (LWD)). The same applies to the construction of the well ("Well Site Construction") or the subsequent oil, gas or hot water production. Only by recording the respective, relevant measured variables can a well be operated safely, efficiently and economically. A problem arises both with the real-time data transmission ("online data

transmission of data on the surface as well as in the power supply of the underground units from the surface.The data should be transmitted from several kilometers depth at a high data rate (eg 200kBaud), the underground units should be powered from day to day ( eg 200W).

One of the biggest problems is the risk of explosion. In particular, the limited foreseeable occurrence of

Gas accumulation must be considered. For the wiring of drill pipes so special safety precautions are to be taken, which prevent the emergence of possible sparks or these arise only in explosion-proof areas.

Solution approaches in which the individual elements of the drill string are only inductively coupled to each other, so no exposed electrical conductors or contacts are available circumvent this problem, however, neither the desired data rates can be achieved nor underground consumers are supplied with power. It therefore requires a solution that makes it possible

BohrStrangelemente or drill pipes galvanically to each other connect. For this purpose, both suitable solutions for the coupling of the individual Borhstrangelemente or drill pipes as well as for the wiring of the drill pipes themselves are necessary. The former is achieved by the device for connecting electrical conductors according to AT 508 272 B1.

The invention is therefore based on the object to provide a solution for the wiring within a drill string or drill string.

This object is achieved by a drill pipe of the type mentioned, which is characterized in that

Drill pipe and the inner tube partially from each other

spaced, whereby the drill pipe and inner tube a

Limiting cavity, and that at least one electrical conductor is arranged on an outer side of the inner tube.

This arrangement protects the wiring in two ways. On the one hand, the environment is protected against the electrical conductor, as it is separated from the environment. On the other hand, both within a drill string and outside conditions, which have special requirements for the

used materials and lead to rapid wear, against which the conductor is also protected.

Due to the areawise spacing of the drill tube to

Inner tube creates a cavity between the two, in this can be according to a preferred embodiment of the invention, a filler. The cavity can also be empty. This allows any deformation of the inner tube, which passes through the very high pressure through the inner tube

Rinsing fluid can be caused to be counteracted. In addition, if necessary by suitable filler material

Vibrations or vibrations are damped, which occur during operation, or the rinsing liquid can be thermally isolated from the environment of the drill pipe. Alternatively, according to a preferred embodiment, the filling material may be used for sensory purposes, as due to the conditions prevailing in the tube and around the tube

Conditions change various measurable properties of the filler. In this case, both properties that correlate directly with the environment, such as pressure and temperature, can be measured, as well as those that correlate only indirectly with the environment, such as the electrical

Conductivity of the filling material.

According to a preferred embodiment, the electrical

Head arranged on the outside of the inner tube. The

Fixing must be done so that the conductor and the

Inner tube are electrically isolated from each other, since this is usually made of a conductive material,

for example steel.

By a direct attachment of the conductor on the inner tube, changes in the inner tube, in particular changes in length, for example by thermal expansion or the

Dead weight, transferred directly to the ladder. As a result, the conductor himself can fulfill sensory purposes, for example for length measurement of the drill string as described in AT 504 294 A.

According to a very particularly preferred embodiment, the electrical conductor is on the outside of the inner tube

preferably connected over the entire length of the conductor with the inner tube, for example glued. Ideally, the conductor itself takes the form of a section of a pipe. Furthermore, the ladder is thereby slightly or not at all different from the shape of a pipe or a section thereof. Thus, the largest possible conductor cross-section can be achieved for the given space, whereby the electrical resistance of the conductor is kept as low as possible. If several conductors are desired, for example, electrically insulating webs can be provided, through which the conductor is divided lengthwise into partial conductors, for example halved or quartered. So can the number the ladder is adapted to the needs and / or

different ladders are each assigned a different task. For example, six conductors may be provided, two of which serve to power consumers and four as data conductors. Preferably, two conductors are used, one as a forward conductor and one as a return conductor, which are used both as energy and as data conductors.

Independent of or in addition to the aforementioned

Embodiments are according to another preferred

Embodiment of the invention in the cavity at least one

arranged electrical and / or electronic device. This can fulfill different functions. On the one hand, according to a preferred embodiment of the invention, it can fulfill sensory tasks, inter alia measuring the various properties of the filling material or the conductor itself as described above or, for example, detecting the position or position of the drill string with a position sensor. On the other hand, it can be used, for example, as a signal amplifier, e.g. for out of neighboring

Bohrstrangelementen or instruments in the drill head coming data signals serve.

According to a further alternative or additional preferred embodiment, an electronically readable information carrier, in particular a chip, is arranged in the cavity and the electronically readable information carrier is connected via a switch to the electrical conductor. So can individual

Drill pipes for one thing are identified at any time, for

Others may also have information, such as the time of the last maintenance of the drill pipe, directly in the

Borders ear deposited. In this case can

For example, be given a warning when the maintenance of a drill pipe is already too long ago.

Further preferred embodiments of the invention are

Subject of the remaining dependent claims. The invention will be further explained in the following with reference to the drawings. It shows:

Fig. 1 is a schematic cross section through a

Embodiment of a drill pipe according to the invention with four conductors,

Fig. 2 is a longitudinal section through one end of another

Embodiment of the drill pipe according to the invention with a conductor and

Fig. 3 is a longitudinal section through the other end of

Performance form of the drill pipe according to the invention of FIG. 2.

An inventive drill pipe 1 has an inner tube 2, a cavity 3 between drill pipe 1 and inner tube 2 and at least one conductor 4, 7, 8, 9. The drill pipe 1 is made of steel in this embodiment.

Fig. L shows in a highly schematic form in section the structure of a drill pipe according to the invention 1. The inner tube 2 is electrically insulated by an insulation 5 to the outside.

This is especially necessary if an electrically conductive or electrostatically chargeable material is used for the inner tube 2. Since 2 materials must be selected for the inner tube, which can withstand the special conditions in drilling, usually steel is used for this purpose, ie an electrically conductive material. Without insulation 5, an interior space 6 of the inner tube 2 would be exposed to an increased danger of explosion or the risk of a short circuit. Should the inner tube 2 be an electrically nonconductive material,

For example, be used a carbon fiber reinforced plastic, could also be dispensed with the insulation 5 between the conductors 4, 7, 8, 9 and the inner tube 2. On the insulation 5 are in the illustrated embodiment, four conductors 4, 7, 8, 9 which each against each other

insulating webs 10, 11, 12, 13 are insulated. The conductors 4, 7, 8, 9 in this example each have the form of Quarter pipe segments. Embodiments in which only one tubular conductor 4 is provided are also conceivable, as are those in which other numbers, for example two, three, five or more, of conductors 4, 7, 8, 9 are provided. It is also possible to easily arrange round or flat conductor on the inner tube.

Between the inner tube 2 with the conductors 4, 7, 8, 9 and the

Qestängerohr 1 is located in the embodiment of the cavity

3, which extends substantially the entire length of the

Extends Drängerohres and preferably filled with a filling material. The cavity is sealed at both ends by a respective seal 26, 27 (FIG. 3). The filler is preferably free-flowing or free-flowing. The filler material may consist of, for example, resin, silicone oil, sand, glass or ceramic or contain these materials. Should be

Filling material to be selected, which is electrically conductive, it is necessary, even on the drill pipe side facing the conductor 4, 7, 8, 9 to provide insulation. It is meaningful such insulation in any case, even to avoid damage to the conductors 4, 7, 8, 9 during installation. In this sense, embodiments are conceivable in which the conductors 4, 7, 8, 9 partially or completely in the material of the inner tube. 2

are included.

In the illustrated embodiment, in the cavity 3, surrounded by filler, an electrical device 14 and a

arranged electronically readable information carrier 15. Both are, optionally via switches, with at least one conductor

4, 7, 8, 9 connected (not shown).

2 shows a longitudinal section through an end of a further embodiment of a drill pipe according to the invention. The

Drill pipe 1 has a thread 16 in the box

designated end 19, with which it with the pin

designated end 23 (Fig. 3) of another drill pipe can be connected. It also shows a first part of a Clutch mechanism on. The coupling mechanism consists of two assemblies 17a, 17b and may be constructed, for example, as explained in the AT 508 272 Bl. The clutch mechanism makes electrical connection only via the pin 18, which shifts from the first assembly 17a of the clutch mechanism to a second assembly 17b of the clutch mechanism. All other parts of the clutch mechanism are isolated from the environment. At its end facing away from the thread 16, the first assembly 17 a of the coupling mechanism is galvanically connected to the conductor 4. To further reduce the danger of explosion and the risk of damage, the end of the

Ladder 4, the first assembly 17a of the coupling mechanism and their connection by an additional insulation 20 to the inside of the inner tube 2 isolated. In the course of the conductor 4 is then similar to the one shown in Fig. 1 via an insulation 5 on the inner tube 2 at.

Thus, the cavity 3 between the inner tube 2 and drill pipe 1 is accessible even after the completion of the drill pipe l, at least one opening 21 is vorgehsehen in the drill pipe 1, which can be closed with a closure element 22. Thus, the cavity 3 can be filled with different filling materials, or they can be replaced according to the situation and / or the desired function. For example, in applications where it is likely that the

Inner tube 2 in stronger vibrations device, the cavity filled with sand, to dampen these vibrations. Alternatively, for example, ceramic balls could be used. In other possible applications, it may be desirable for the drill pipe 1 to have buoyancy in the relatively high specific gravity mud ("mud"), e.g. in horizontal bores may be advantageous to reduce the friction on the borehole wall. In this case, e.g. Air or light oils a more suitable filler.

Furthermore, electrical devices 14 or electronically readable data carriers 15 can be made accessible via the opening 21 and / or replaced or repaired if necessary.

Fig. 3 shows a longitudinal section through the other, designated as pin 23, the end of the drill pipe 1 of Fig. 2. The second

Assembly 17b of the clutch mechanism is doing a

galvanic connection to the conductors of a following

Outrageous ear. On its side facing away from the connection, a conductor 24, for example a cable, runs to the conductor 4 located on the inner tube 2. In order to provide easy access to this connection as well, for example for maintenance purposes

allow, here is an opening 21 which can be closed with a closure element 22.

Claims

Claims: 1. drill pipe (1), in particular for a drill string, with

at least one electrical conductor (4, 7, 8, 9) and an inner tube (2) located inside the drill pipe (L)

is arranged, characterized in that the drill pipe (1) and the inner tube (2) partially to each other

whereby drill pipe (1) and inner tube (2) define a cavity (3), and that at least one electrical conductor (4, 7, 8, 9) is arranged on an outer side of the inner tube.

2. drill pipe (1) according to claim 1, characterized in that on an outer side of the inner tube (2) at least one electrical conductor (4, 7, 8, 9) is arranged.

3. drill pipe (1) according to claim 1 or 2 characterized

in that the electrical conductor (4, 7, 8, 9) 'is fastened on the outside of the inner tube (2).

4. drill pipe (1) according to one of claims 1 to 3, characterized in that the electrical conductor (4, 7, 8, 9) on the outside of the inner tube (2) preferably over the entire length of the conductor {4, 7, 8 , 9) is connected to the inner tube (2).

5. drill pipe (1) according to one of claims 1 to 4, characterized in that in the cavity {3) at least one

electrical device (4) is arranged.

6. drill pipe (1) according to claim 5, characterized in that the electrical device (14) is a sensor.

7. drill pipe (1) according to claim 6, characterized in that the sensor is a temperature sensor, a pressure gauge, a geomagnetic field sensor or a strain sensor.

8. drill pipe (L) according to one of claims 1 to 7, characterized in that the cavity {3) is completely sealed against the Utngebung.

9. drill pipe (1) according to one of claims 1 to 8, characterized in that there is a filling material in the cavity.

10. drill pipe (1) according to claim 9, characterized in that the filling material is resin, silicone oil, sand, glass or ceramic.

11. drill pipe (1) according to claim 9, characterized in that the filling material has a lower specific gravity than a drilling fluid flowing through the drill pipe.

12. drill pipe {1) according to claim 9, characterized in that the filling material has a low thermal conductivity.

13 drill pipe (1) according to claim 9, characterized in that the filler has a low compressibility

having .

14 drill pipe (1) according to claim 9, characterized in that the filling material has vibration-damping properties.

15. Drum tube (1) according to one of claims 1 to 14, characterized in that in the cavity (3) an electronically readable information carrier (15), in particular a chip, is arranged, and that the electronically readable

Information carrier {14) via a switch with the

electrical conductor {4, 7, 8, 9) is connected.

16 drill pipe (1) according to one of claims 1 to 15 characterized characterized in that a plurality of conductors (4, 7, 8, 9) by optionally insulating webs (10, 11, 12, 13)

are separated from each other.

17. drill pipe (1) according to one of claims 1 to 16, characterized in that at least one conductor (4, 7, 8, 9} is a data conductor.

18. drill pipe (1) according to one of claims 1 to 16, characterized in that at least one conductor (4, 7, 8, 9) is used to supply consumers with electricity.