Downhole reeled tubing inspection system with fiberoptic cable
First Claim
Patent Images
1. A system for inspecting within a borehole comprising:
- a first length of conduit extending from the surface through the borehole down into the zone where the inspection is to occur;
a second length of conduit extending from the surface through the borehole down into the zone where the inspection is to occur, said second length of conduit being smaller in diameter than the said first length and being axially positioned within said first length of conduit to define an annular space therebetween, said annular space forming a first fluid passageway and the interior of said length of second conduit forming a second fluid passageway;
a sensor mounted on the lower end of said conduits for inspecting conditions within the borehole;
means for pumping from the surface down one of the passageways through the concentric lengths of conduits into an inspection region adjacent the sensor, a first fluid which provides a medium conducive to accurate inspection of conditions within the borehole by the sensor; and
means for pumping from the surface down the other passageway a second fluid which performs an auxiliary function concerning the sensor.
2 Assignments
0 Petitions
Accused Products
Abstract
A system for the inspection of a well borehole and the formation around the borehole. The system includes a pair of concentric reeled tubings for injecting a pair of fluids into a wellbore through a wellhead, one of said fluids being an optically transparent or acoustically homogenous fluid which forms a slug of said fluid around an optical sensor which transmits signals indicative of well conditions to the surface. The other of said fluids is used to perform functions with respect to said sensor such as cooling said sensor or protect it from a corrosive environment. In addition, a fiberoptic cable construction in combination with the reel tubing is also disclosed.
-
Citations
28 Claims
-
1. A system for inspecting within a borehole comprising:
-
a first length of conduit extending from the surface through the borehole down into the zone where the inspection is to occur; a second length of conduit extending from the surface through the borehole down into the zone where the inspection is to occur, said second length of conduit being smaller in diameter than the said first length and being axially positioned within said first length of conduit to define an annular space therebetween, said annular space forming a first fluid passageway and the interior of said length of second conduit forming a second fluid passageway; a sensor mounted on the lower end of said conduits for inspecting conditions within the borehole; means for pumping from the surface down one of the passageways through the concentric lengths of conduits into an inspection region adjacent the sensor, a first fluid which provides a medium conducive to accurate inspection of conditions within the borehole by the sensor; and means for pumping from the surface down the other passageway a second fluid which performs an auxiliary function concerning the sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A system for inspecting the interior of a borehole, comprising:
-
a reeled tubing unit including a reel having a length of tubing wound thereon and an injector for inserting the tubing on the reel down into a borehole into a location at which inspection is to occur; an inspection sensor mounted to the end of the reeled tubing to be inserted into the borehole; a second length of tubing extending axially within said first length of tubing and also being wound on said reel the interior of said second length of tubing forming a first fluid passageway and the annular space between said first and second lengths of tubing forming a second passageway; a first pump connected to the end of the reeled tubing located at the surface for supplying pressurized optically transparent and/or acoustically homogenous fluid to one of the passageways within said reeled tubing; a fluid injection nozzle means mounted to the lower end of the reeled tubing and in fluid communication with said one of the passageways within the interior of the tubing for allowing a flow of fluid from within the tubing out into the borehole to produce a fluid inspection zone within the borehole in the region of the sensor and enable the sensor to accurately inspect physical conditions within the borehole; a second pump connected to the end of the reeled tubing located at the surface for supplying a second fluid down the other of the passageways within the tubing; and a fluid flow passageway associated with the sensor and connected to said other of the passageways for receiving the flow of the second fluid and directing it around the sensor for performing an auxiliary function concerning the sensor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
-
Specification