Real time downhole intervention during wellbore stimulation operations
a real-time downhole and wellbore technology, applied in the direction of borehole/well accessories, fluid removal, sealing/packing, etc., can solve problems such as the opening of a valve in the fra
Active Publication Date: 2012-09-13
ZIEBEL AS
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Benefits of technology
"The invention relates to methods for wellbore based reservoir stimulation operations. More specifically, the invention relates to methods for wellbore intervention during reservoir stimulation through the wellbore. The invention provides a spoolable rod system containing sensing fibers and / or electrical cable(s) for sensing well conditions during production, injection, and shut-in. The system is used to monitor in real-time the stimulation process in the wellbore. The invention also includes a method for opening valves in the wellbore using darts or balls that are pumped into the wellbore. The darts or balls engage with the valves and then are pushed into the wellbore to open the valves. The invention allows for efficient and effective wellbore stimulation operations."
Problems solved by technology
Pressurizing the well from surface further after engagement of the ball or dart with the profile forces the ball or dart downward, which results in opening a valve in the frac sleeve.
Method used
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Embodiment Construction
[0013]A semi stiff, spoolable rod system containing sensing fibers and / or electrical cable(s) for sensing has been developed and demonstrated by the assignee of the present invention. Such spoolable rod is used to provide services under the service mark ZIPLOG, which is a service mark of the assignee of the present invention. The system is based on pushing the spoolable rod into producing and / or fluid injection wellbores. The spoolable rod is typically disposed on a reel or winch and is pushed inside a tubing string (production tubing) inserted into the well coaxially with the wellbore casing by operating the winch. By having sensing elements, for example, optical fiber temperature and / or pressure sensing elements, at spaced apart positions incorporated into the spoolable rod, it is possible to provide real time data to the surface about well conditions during production, injection and shut-in. The foregoing spoolable rod to provide ZIPLOG services includes such sensing elements. Se...
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A method for completing a wellbore having a plurality of stimulation valves disposed therein at longitudinally spaced apart locations includes moving a spoolable rod into the wellbore. The rod includes a plurality of spaced apart sensors therein. At least one valve operating dart is applied to an exterior of the spoolable rod. The dart is configured to engage a selected one of the stimulation valves. A position of the at least one dart is estimated during pumping of fluid into the wellbore by measuring output of the sensors in the rod.
Description
FIELD OF THE INVENTION[0001]The invention relates generally to the field of wellbore based reservoir stimulation operations. More specifically, the invention relates to methods for wellbore intervention during reservoir stimulation through the wellbore.BACKGROUND ART[0002]To increase productivity of oil and / or gas wells, hydraulic stimulation (fracturing) is typically used. One method of fracturing in wells including a plurality of depth-separated producing formations includes installation of stimulation valves, so-called “frac sleeves”, adjacent to each of the formations to be stimulated by fracturing. The fracturing is performed by pumping fluid within a string of casing or tubing installed in the wellbore. A typical well completion configuration is shown in FIG. 1A for multiple formations 17 each having an associated frac sleeve. FIG. 1B shows a ball 13 which is used to open the frac sleeve 10 having been inserted into the sleeve 10 in a selected position in the casing or tubing ...
Claims
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IPC IPC(8): E21B34/06
CPCE21B23/00E21B43/26E21B34/14E21B34/06
Inventor HANSEN, HENNING
Owner ZIEBEL AS