Signal propagation lines of many types are utilized in the hydrocarbon recovery industry with great regularity. Such lines, although necessary in contemporary hydrocarbon recovery, are extremely helpful for the same must still be accommodated at a downhole tool string in order to be useful. While there are currently a plethora of attachment means utilized in the downhole industry, additional methods are always welcome. This is particularly so in view of the sensitivity of optic fiber signal propagation lines, which are becoming increasingly ubiquitously sought after. Optic fibers are often used as sensory devices by registering strain therein. In view of this mode of operation, however, residual strain from processing of various strain components for from attachment of the optic fiber to strain components can be detrimental to the accuracy and monitoring system utilizing such fiber. Since greater accuracy of monitoring in the wellbore leads to greater productivity in recovery of hydrocarbons from the wellbore, the art is always well receptive of additional methods and configurations to achieve this end.
A method for securing a signal propagating line to a downhole component includes configuring the downhole component in a final form prior to securing the line thereto; positioning the line at an outside dimension of the component; and fusing the line to the component with a heat based fusion method.
A low residual stress signal propagation line connection system includes a downhole component preformed into a final form; and at least one heat based fusion securing the line to an outside dimension of the component.
Referring now to the drawings wherein like elements are numbered alike in the several Figures:
Referring to all of the figures simultaneously, initially, three alternative concepts are disclosed for securing a signal propagation line to a downhole component while avoiding the introduction of excessive residual stress in the materials surrounding the line or in the line itself. Such stresses introduce anomalous readings from the line when using the same as a sensor. In some cases, the anomalies are significant and thus difficult to miss by a seasoned well operator, but in other cases they may be more subtle thereby rendering them difficult to directly detect. In such situations, a well operator might not even know that there is any anomaly to account for and make decisions that do not ultimately result in a positive change in the productivity of the well. Worse yet, due to the residual stresses, the operator may fail to appreciate a condition in the downhole environment that if left unaddressed, will cause the well to require a workover. Because in such situation where the operator is not aware of a problem, he is unlikely to take prophylactic measures to prevent the necessity of a workover. This lack of preemptive action normally will result in a more costly reactive action.
In order to address the problems discussed above, the present inventors have devised the below described configurations and methods for securing signal propagation lines, and especially optic fiber lines, to downhole components.
Referring to
Referring to
In an alternate embodiment and referring to
In yet another alternate embodiment, and referring to
In each of the embodiments discussed above, the line 10 is positioned at a potentially damage prone location. In order to protect the line from inadvertent damage while, for example, running in the hole, the configurations discussed may sometimes be built with an additional outer cover 24 (as illustrated in each of the figures). The outer cover 24 is a perforate tubular mounted in such a way as to maintain a clearance 26 between an inside dimension 28 thereof and a radially outermost surface 30 of the line 10. The clearance may be any practical clearance to give a buffer between the cover and the line. The outer cover 24 may be mounted as illustrated with support structures 32 fixed to a base pipe 34 by fasteners or fusion means.
While preferred embodiments have been shown and described, modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustrations and not limitation.
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Restarick, Henry; “Horizontal Completion Options in Reservoirs With Sand Problems”; SPE29831; SPE Middle East Oil Show, Bahrain; Mar. 11-14, 1995; pp. 545-560 |
International Search Report and Written Opinion, Mailed Jul. 10, 2009; PCT/US2008/083956, Written Opinion 7 pages and Search Report 3 pages. |
Number | Date | Country | |
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20090139733 A1 | Jun 2009 | US |