The invention generally relates to communication connections for wired drill pipe joints.
A typical system for drilling an oil or gas well includes a tubular drill pipe, also called a “drill string,” and a drill bit that is located at the lower end of the drill string. During drilling, the drill bit is rotated to remove formation rock, and a drilling fluid called “mud” is circulated through the drill pipe and returns up the annulus for such purposes as cooling the drill bit and removing debris that is generated by the drilling. A surface pumping system typically generates the circulating mud flow by delivering the mud to the central passageway of the drill pipe and receiving mud from the annulus of the well. More specifically, the circulating mud flow typically propagates downhole through the central passageway of the drill pipe, exits the drill pipe at nozzles that are located near or in the drill bit and returns to the surface pumping system via the annulus between the pipe and the wellbore.
One technique to rotate the drill bit involves applying a rotational force (through a rotary table and kelly arrangement or through a motorized swivel, as examples) to the drill pipe at the surface of the well to rotate the drill hit at the bottom of the string. Another conventional technique to rotate the drill bit takes advantage of the mud flow through the drill pipe by using the flow to drive a downhole mud motor, which is located near the drill bit. The mud motor responds to the mud flow to produce a rotational force that turns the drill bit.
The drilling of the well may be aided by communication between the surface of the well and tools at the bottom of the drill pipe. In this regard, the bottom end of a conventional drill pipe may include tools that measure various downhole parameters (pressures, temperatures and formation parameters, as examples) and characteristics of the drilling (direction and inclination of the drill bit, for example), which are communicated uphole. The uphole communication from a downhole location to the surface may involve the use of a mud pulse telemetry tool to modulate the circulating mud flow so that at the surface of the well, the modulated mud flow may be decoded to extract data relating to downhole measurements. Additionally, downhole communication may be established from the surface of the well to downhole tools of the drill pipe through one of a number of different conventional telemetry techniques. This downhole communication may involve, as examples, acoustic or electromagnetic signaling.
A more recent innovation in drill pipe telemetry involves the use of a wired drill pipe (WDP) infrastructure, such as the WDP infrastructure that is described in U.S. Patent Application Publication No. US 2006/0225926 A1, entitled, “METHOD AND CONDUIT FOR TRANSMITTING SIGNALS,” which published on Oct. 12, 2006 and is owned by the same assignee as the present application. The WDP infrastructure typically includes communication lines that are embedded in the housing of the drill pipe. Because a conventional drill pipe may be formed from jointed tubing sections, communication connections for the WDP infrastructure may be made at each joint of the drill string. Due to the repeated use of the jointed tubing sections in numerous drilling jobs, the drill pipe joints typically are often re-faced and re-cut. Challenges typically arise in designing the communication connections for the WDP infrastructure in order to accommodate the re-facing and re-cutting of the drill pipe joints.
In one aspect, a drill pipe includes a pin end connector, a box end connector, a first communication connector and a second communication connector. The pin end connector includes a first region to form a threaded connection to join sections the drill pipe together, and the first region includes at least one thread that begins at one end of the first region and ends at the other end of the first region. The box end connector receives the pin end connector, and the box end connector includes a second region to mate with the first region to form the threaded connection. The first communication connector is attached to the pin end connector and is located in the first region; and the second communication connector is attached to the box end connector and is located in the second region to form a communication connection with the first communication connector.
In another aspect, a drill pipe includes a pin end connector, a box end connector to receive the pin end connector, a first communication connector and a second communication connector. One of the pin end and box end connectors includes a shoulder that defines a corner and is located near an end of the other of the pin end and box end connectors when the box end connector is received the pin end connector. One of the first and second communication connectors is located in a pocket that is formed in the corner.
In another aspect, a drill pipe includes a pin end connector, a box end connector to receive the pin end connector, a first communication connector and a second communication connector. The box end connector includes an inner shoulder to be in close proximity to an end of the pin end connector when the box end connector receives the pin end connector, and the first communication connector is attached to the pin end connector near the end of the pin end connector. The second communication connector is attached to the box end connector near the inner shoulder of the box end connector and is located radially outside of the first communication connector. The second communication connector is adapted to form a communication connection with the first communication connector.
In another aspect, a technique includes connecting drill pipe sections together, including threadably engaging a first region of a pin end connector with a second region of a box end connector. The technique includes communicating a signal through a communication connection that spans between the first and second regions.
In yet another aspect, a technique includes connecting drill pipe sections together, including engaging a pin end connector with a box end connector. The technique includes communicating a signal through a communication connection that spans between a first region of the pin end connector, which is located near an end of the pin end connector and a second region of the box end connector, which is located near an inner shoulder of the box end connector and radially outside of the first region.
Advantages and other features of the invention will become apparent from the following drawing, description and claims.
According to one example,
Thus, for the example that is depicted in
The drilling operation and/or the downhole formations through which the wellbore 20 extends may be monitored at the surface of the well via measurements that are acquired downhole. For this purpose, the drill pipe 30 has a wired drill pipe (WDP) infrastructure 84 for purposes of establishing one or more communication link(s) between the surface of the well and downhole tools that acquire the measurements, such as tools that are part of a bottom hole assembly (BHA) 50 of the pipe 30. A non-limiting examples, the WDP infrastructure 84 may provide electrical and/or optical communication link(s).
The communication through the WDP infrastructure 84 may be bidirectional, in that the communication may be from the surface of the well to the BHA 50 and/or from the BHA 50 to the surface of the well. Furthermore, the communication may involve the communication of power from the surface of the well to the BHA 50. Thus, many variations and uses of the WDP infrastructure 84 are contemplated and are within the scope of the appended claims.
The WDP infrastructure 84 includes communication line segments 85 (fiber optic line segments or electrical cable segments, as just a few examples) that are embedded in the housing of the drill pipe 30, and the WDP infrastructure 84 may include various repeaters 90 (one repeater 90 being depicted in
In general, the drill pipe 30 is formed from jointed tubing sections 60 (specific jointed tubing sections 60a and 60b being labeled in
A given jointed tubing section 60 may have one or more communication line segments 85, possibly one or more repeaters 90 and communication connectors (not shown in
Among the other features of the drill pipe 30, the BHA 50 may include a communication tool 54 that communicates with a surface controller 15 via signals that are communicated over the WDP infrastructure 84. As examples, the tool 54 may receive power, control and/or data signals from the WDP infrastructure 84. Furthermore, the tool 54 may transmit signals (signals indicative of acquired measurements, for example) uphole to the surface controller 15 via the WDP infrastructure 84.
The tool 54 may be constructed to acquire downhole measurements, and in addition to using the WDP infrastructure 84, the tool 54 may use alternative paths (such as mud pulse telemetry, for example) for communicating with the surface. As non-limiting examples, the tool 54 may be a measurement while drilling (MWD) tool, a logging while drilling (LWD) tool, a formation tester, an acoustic-based imager, a resistivity tool, etc. Furthermore, the drill pipe 30 may contain a plurality of such tools that communicate with the surface via the WDP infrastructure 84. It is noted that the drill pipe 30 may include various other features, such as a drill collars, an under-reamer, etc., as the depiction of the drill pipe 30 in
As a more specific example, the WDP joint 110 may be a double shoulder, rotary connection, in that the upper jointed tubing section 60a and the attached pin end connector 120 are rotated about the longitudinal axis 100 with respect to the box end connector 160 and the attached lower jointed, tubing section 60b fix purposes of threadably connecting the pin end 120 and box end 160 connectors together. In this regard, for this example, the pin end connector 120 has an external tapered thread 124 that helically circumscribes the longitudinal axis 100 and is constructed to engage a mating, internal tapered thread 164 (of the box end connector 160), which also helically circumscribes the longitudinal axis 100.
When the WDP joint 110 is fully assembled, a downwardly directed annular face 126 of the pin end connector 120 contacts or at least conies in close proximity to an upwardly directed, inner annular shoulder 166 (herein called the “internal shoulder 166”) of the box end connector 160. Also, when the WDP joint 110 is fully assembled, an upwardly directed annular face 162 of the box end connector 160 contacts or at least comes in close proximity to a downwardly facing external annular shoulder 122 (herein called the “external shoulder 122”) of the pin end connector 120.
The external thread 124 of the pins end connector 120 longitudinally and continuously (as one example) extends between two relatively smooth external cylindrical surfaces 127 and 129 of the connector 120. More specifically, the external thread 124 longitudinally extends from the external surface 129, which is located near the external shoulder 122 to the external surface 127, which is located near the lower end of the pin end connector 120. The internal thread 164 of the box end connector 160 longitudinally and continuously (as one example) extends between two relatively smooth internal cylindrical surfaces 167 and 169 of the connector 160. More specifically, the internal thread 164 extends from the internal surface 169, which is located near upper end of the box end connector 160 to the internal surface 167, which is located near the internal shoulder 166 of the box end connector 160.
As depicted in
In accordance with examples that are described herein, communication connectors are disposed in the pin end 120 and box end 160 connectors for purposes of establishing one or more communication connections (for the WDP infrastructure 84), which span across the WDP joint 110.
As a more specific example,
As examples, the communication connectors 112 and 114 may be constructed to communicate any of a number of different signals across the communication connection, such as electrical signals, optical signals and electromagnetic flux signals, as just a few examples. Thus, the connectors 112 and 114 may be, as examples, direct contact electrical connectors, inductive connectors, resistive couplers, toroid-typo connectors, fiber optic connectors, etc. Additionally, the communication connection that is established by the connectors 112 and 114 may be a connection to communicate a data signal, a power signal and/or a control signal.
Although one pair of connectors 112 and 114 is depicted in
As depicted in
The communication line segment 85a extends longitudinally upwardly from the communication connector 112 and is routed through a longitudinal passageway 128 that is formed in the pin end connector 120. For this example, the passageway 128 is located near the pin end connector's inner cylindrical surface 102 that forms part of the central passageway section 101 of the drill pipe 30. However, the passageway 128 may be located closer to an outer surface 103 of the pin end connector 120, as another example. As examples, the passageway 128 may be formed by gun drilling, drilling, electrical discharge machining (EDM) or any other material removal process that forms a hole, whether the cross-section of the hole is round or otherwise. As another example, the passageway 128 may be formed using plunge EDM and cut into almost any shape desired for the cross-section of the passageway 128. The cross-section may be, as examples, round or as another example, oval to reduce stress concentrations.
The box end connector 160 includes a longitudinal passageway 168 through which the communication line, segment 85b is run to form a connection to the communication connector 114. The passageway 168 may be formed by any of the techniques described above and may have one of a variety of different cross-sectional shapes. As shown, the passageway 168 generally extends downhole from the communication connector 114 and may (as an example) be close to the box end connector's 160 inner surface 161 that forms part of the central passageway section 101 of the drill pipe 30.
As an example, the connectors 112 and 114 may be relatively shallow and long. The connectors 112 and 114 may be “snap and groove” connectors, in that one of the connectors 112 and 114 snaps into a groove of the other connector 112, 114. As another example, the connectors 112 and 114 may be designed so that one connector 112, 114 forms a groove into which the other connector 112, 114 slides into. As an example, protective caps may be used to protect the connectors 112 and 114 during stabbing of the pin end connector 120 into the box end connector 160. It is noted that the positioning of the communication connectors 112 and 114 permits re-cuts while maintaining the connection-to-assembly-to-hole alignment.
Referring to
The WDP joint 200 includes communication connectors 201 and 202 that are disposed in pockets 203 (in the pin end connector 120) and 204 (in the box end connector 160), respectively. In general, the communication connectors 201 and 202 may be connectors similar to any of the examples given above for the communication connectors 112 and 114. The pocket 203 is formed in a corner 121 that is defined by the external shoulder 122 of the pin end connector 120. Thus, for this arrangement, a portion of the corner 121 is removed, or hollowed out, to form the pocket 203. The connector 201 has a shape that preserves the corner 121 so that when the WDP joint 200 is fully assembled, the connector 202 (which is located in the upper end of the box end connector 160) fits against a portion 205 of the corner 201 that is framed by the connector 201, as shown in
As also depicted in
A particular advantage of the WDP joint 200 is that the communication connector 201 is protected from being damaged during handling and mating of the pin end 120 and box end 160 connectors. Also, the connectors 201 and 202 are relatively easily accessed.
Referring to
As examples, the communication connectors 224 and 226 may form the communication connection that spans between the flanks of two engaging threads or may form the communication connection that spans between the root and crest of two engaging threads. More specifically,
When the WDP joint 220 (see also
As an alternative, the above-described direct contact communication connectors may be used to establish a communication connection that spans between the root and crest of two engaging threads. Referring to
It is noted that for purposes of
Referring back to
Although the communication connectors 224 and 226 may be, in general, located in the threaded region of the pin end 120 and box end 160 connectors for purposes of forming a communication connection in the region, the communication connectors 224 and 226 may create a communication connection that does not directly span between two threads. For example,
Instead, the threaded region between the pin end 120 and box end 160 connectors includes, near its upper end, a first threaded region in which an interior thread 253 of the pin end connector 120 engages a corresponding exterior thread 251 of the box end connector 160. Near the lower end of the WDP joint 250, the threaded region includes an internal tapered thread 257 of the box end connector 160, which engages a corresponding external thread 255 of the pin end connector 120.
The threaded region also includes an intervening non-threaded region. In particular, the pin end connector 120 includes a relatively smooth and tapered external surface 263 that extends between the upper external thread 251 and the lower external thread 255. Similarly, the box end connector 160 includes a mating relatively smooth and tapered internal surface 263 that extends between the upper 253 and lower 257 internal threads of the connector 160. In general, when the WDP joint 250 is fully assembled, the surfaces 261 and 263 are opposed to and in close proximity to each other. As depicted in
Other variations are contemplated and are within the scope of the appended claims. For example,
While the present invention has been described with respect to a limited number of embodiments, those skilled in the art, having the benefit of this disclosure, will appreciate numerous modifications and variations therefrom. It is intended that the appended claims cover all such modifications and variations as fall within the true spirit and scope of this present invention.
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2178931 | Crites et al. | Nov 1939 | A |
3518608 | Papadopoulos | Jun 1970 | A |
4537457 | Davis et al. | Aug 1985 | A |
7156676 | Reynolds, Jr. | Jan 2007 | B2 |
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20070167051 | Reynolds, Jr. | Jul 2007 | A1 |
Number | Date | Country | |
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20100264650 A1 | Oct 2010 | US |
Number | Date | Country | |
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60954482 | Aug 2007 | US |
Number | Date | Country | |
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Parent | 11965148 | Dec 2007 | US |
Child | 12825727 | US |