Patent Application
20100319931
The following descriptions and examples are not admitted to be prior art by virtue of their inclusion in this section.
In a variety of well related applications, communication lines are used to convey many types of signals, such as electrical signals, fiber optic light signals, hydraulic signals, and other types of signals to or from downhole locations. For example, the communication lines can be used to transmit data on downhole conditions to a surface control system. The communication lines also can be used to send control signals or other information downhole from the surface. In some applications, the communication lines are used to transmit electrical signals, such as electric power signals, to power downhole equipment.
The communication lines are deployed downhole in conjunction with well strings, e.g. tubing strings, used to convey tool assemblies downhole for many types of servicing operations, production operations, and other well related operations. The communication lines and tool assembly may be conveyed downhole by a rig deployed at a surface location above the well. Rig time is a valuable commodity, and operation of the rig can result in substantial costs. Online rig assembly time, referred to as “online” is the operating time in which the critical path for a rig is governed by the tool assembly at substantial cost. In contrast, offline assembly time, referred to as “offline” is any equipment assembly time in which the critical path for the rig is not governed by the tool assembly. The offline time is much less expensive than the online time.
Each communication line typically is deployed in segments as the tool assembly is conveyed downhole. The segments of communication line may be connected by field weldable connectors that are welded to each communication line segment and then to each other during online rig assembly time. However, formation of the field weldable connectors substantially increases the online rig assembly time which, in turn, substantially increases the expense and the difficulty of routing communication lines over substantial distances through the wellbore.
In general, the present invention provides a technique for efficiently connecting communication lines in a well application by substantially reducing online rig assembly time. The technique reduces online time by sealably fastening a first connector of a downhole connection assembly to a segment of a communication line during offline assembly time to substantially reduce the online time requirements. The first connector is then connected to a corresponding second connector while the rig is online to complete the downhole connection assembly that joins communication line segments.
Other or alternative features will become apparent from the following description, from the drawings, and from the claims.
Certain embodiments of the invention will hereafter be described with reference to the accompanying drawings, wherein like reference numerals denote like elements, and:
In the following description, numerous details are set forth to provide an understanding of the present invention. However, it will be understood by those of ordinary skill in the art that the present invention may be practiced without these details and that numerous variations or modifications from the described embodiments may be possible.
The present invention generally involves a system and methodology to facilitate the formation of communication line connections that can be used in subterranean environments. In well related applications, the communication line connections are substantially premade offline to reduce online rig assembly time. One or both halves of a downhole connector assembly may be sealably fastened, e.g. welded, to a communication line during offline assembly time. This premaking of at least a portion of the communication line connection substantially increases the efficiency of rig usage. It should be noted at least some of the communication line connection embodiments described herein also can be used to improve the efficiency of well related applications that do not involve rig time.
The system and methodology for forming communication line connections are useful with a variety of signal carriers, including those for carrying electrical signals, fiber optic (light) signals, hydraulic signals, and other communication line signals. In the description below, a downhole connector assembly may be used to connect segments of a communication line. The signal carrying components of each communication line segment located within the downhole connector assembly are referred to as the “core”, and the connection between two cores within the downhole connector assembly is referred to as a splice.
According to one specific example, the downhole connector assembly is formed with two connectors that are sealably attached, e.g. welded or otherwise mechanically sealed, to adjacent, corresponding segments of the communication line. Each connector comprises a splice coupling with internal core components. Once the splice couplings are attached, e.g. welded, to the corresponding communication line segments and the core of each side is prepared for splicing, a splice is made between the cores. The splice couplings are then sealably attached, e.g. welded, to each other to complete the downhole connector assembly. Connection of one or both splice couplings to the corresponding communication line segments, as well as preparation of one or both cores, is accomplished during offline assembly time.
The splices/connections can be formed in various configurations. For example, the downhole connector assembly may be constructed by preparing one of two communication line segments during offline assembly time. In this embodiment, one communication line connector is prepared and welded to the communication line offline before the full connection is formed. The assembler of the communication line connection prepares the free end of one communication line segment by welding a connector to the communication line segment during offline time. In other configurations, the splice/connection can be formed by preparing both adjacent communication line segments during offline assembly time. The assembler of the connection prepares the free end of both communication line segments by welding corresponding connectors to the communication line segments during offline time. It should be noted that instead of welding, other techniques, e.g. adhering or employing a separate mechanical seal, can be used to form the various sealed connections.
Referring generally to
The well equipment 24 also comprises one or more communication lines 36 that can be used to convey signals downhole to tool assembly 32 and/or uphole from tool assembly 32. The communication lines 36 may be designed to transmit data and/or power as needed for a desired well application. Additionally, the communication lines 36 can be used to carry signals to or from a variety of other devices/locations in wellbore 26. As tool assembly 32 is conveyed downhole, additional segments of the communication line 36 are connected with a suitable downhole connector assembly, as described in greater detail below.
Referring generally to
During offline time, a connection end 44 of communication line segment 38 is prepared to receive a splice coupling 46 which is slid over connection end 44 and sealably fastened to the outer housing 40. By way of example, splice coupling 46 may be sealably fastened to outer housing 40 via a suitable fastening mechanism 48, such as a weldment or another type of mechanical seal. The signal carriers extending into the interior of splice coupling 46 for splicing to corresponding signal carriers can be referred to as a core or cores 50 and various core related components can be used to facilitate the internal splice of signal carriers. For example, a spacer 52 and a core protection member 54 may be disposed within splice coupling 46 over signal carriers 42. Additionally, a core splice member 56 also may be coupled to the core 50 to facilitate splice formation when attached to the corresponding communication line segment. The splice coupling 46 and the internal core and core components comprise a first connector 58 that is assembled offline for later connection to a corresponding or second connector 60, an embodiment of which is illustrated in
In this particular example, second connector 60 is prepared while the rig 22 is online, and the connection of first connector 58 and second connector 60 also is accomplished during online rig time. A connection end 62 of a corresponding communication line segment 64 is prepared to receive a second or corresponding splice coupling 66 which is slid over connection end 62 and sealably fastened to the outer housing 40. By way of example, splice coupling 66 may be sealably fastened to outer housing 40 via a suitable fastening mechanism 68, such as a weldment or another type of mechanical seal. Additionally, the internal splice of signal carriers 42/core 50 is achieved by joining core splice member 56 with a corresponding core splice member 70. Additionally, a second spacer 72 can be positioned around the core 50 within splice coupling 66, as illustrated. By way of example, the weldment 68 may be formed after insertion of second spacer 72 and after joining of splice members 56, 70.
Once the signal carriers 42 are spliced within the splice couplings 46, 66, the splice couplings 46, 66 can be joined by a suitable connection technique. The connection technique is designed to form a seal to protect the internal splice. By way of example, splice coupling 46 may be connected to the corresponding splice coupling 66 by welding and formation of a suitable weldment 74. Splicing the core and joining splice couplings 46, 66 results in formation of a downhole connector assembly 76.
In an alternate embodiment, both connector 58 and connector 60 are formed during offline assembly time. In
Referring again to
Following offline creation of connector 60, the downhole connector assembly 76 can be completed during online rig time. According to one approach, spacers 80 are installed on both sides of core splice members 56, 70, and the core splice members 56, 70 are engaged, as illustrated in
Referring generally to
Generally, this embodiment enables the complete premaking of one connector, e.g. connector 60, while the other connector is completed online. The connector 58 is completed online because the sealable connection, e.g. weld, is not formed between splice coupling 46 and communication line segment 38 until after the core splice is formed. In a related embodiment, splice coupling 66 is formed with an expanded section 87 to better accommodate the coil 78, as illustrated in
In
After forming each connector 58 and 60 offline, the actual splicing of communication line segments occurs online. The core of each connector is extended via coils 78 to enable splicing of the signal carriers via suitable core splices, such as splices 82. Once connected, the core splices 82 are pushed back into their respective splice couplings in a staggered arrangement, as illustrated in
Referring generally to
Once both sides are prepared, the core splices are formed and pushed back into unitary housing 88 during online rig assembly time. The core splices 82 may be positioned in a staggered arrangement which enables use of smaller diameters in the openings of unitary housing 88, such as shown in the second end 92 for example. Following movement of the core splices 82 into housing 88, the second end 92 of housing 88 is sealably fastened, e.g. welded, to the connection end 44 of communication line segment 38 to complete downhole connector assembly 76.
In
Each connector 58, 60 may be premade offline by splicing the signal carriers of the core 50 to the corresponding mechanical connectors 94, 96 and then sliding the corresponding splice couplings 66, 46, respectively, over the mechanical connectors. The splice couplings 66, 46 are then welded or otherwise sealably fastened to communication line segments 64, 38 of communication line 36. Subsequently, the online formation of downhole connector assembly 76 may be completed by engaging mechanical core splice connectors 94 and 96 followed by sealably fastening the splice connectors 46, 66 via a suitable fastening mechanism 74, such as weldment or a separate mechanical seal. As illustrated, the splice couplings 46 and 66 may have overlapping portions to facilitate sealing engagement.
Examples of techniques for connecting communication lines have been provided, but the connection components and the procedures for forming the connections may vary for different well applications and for other types of applications. In some applications, the coils, spacers, and/or core protection can be individually omitted or substituted with other components. Although the various techniques are useful in increasing the efficiency of forming connections by reducing online rig assembly time, the techniques also can be used in some situations to form both sides of the connector assembly independently of each other while online. Depending on the application, the core and core components may be constructed in a number of different forms, including arranging the core in loops and/or providing compressible telescoping core components to allow for length compensation.
If one or more of the signal carriers comprises a hydraulic control line, the core components may be altered, interchanged or omitted to accommodate the tubing type signal carrier. The connector assemblies also may be designed to accommodate single, dual, or multiple signal carriers that form the internal cores. Furthermore, in addition to welding, other fastening techniques can be used to create sealed connections. Examples of those fastening techniques include compression seals, cone-type pressure connections, epoxy sealed joints, and other suitable fasteners.
Although only a few embodiments of the present invention have been described in detail above, those of ordinary skill in the art will readily appreciate that many modifications are possible without materially departing from the teachings of this invention. Accordingly, such modifications are intended to be included within the scope of this invention as defined in the claims.
