The field of the invention relates to sequentially operated sliding sleeve valves to selectively open and then close a port in a treatment valve and more particularly where one sleeve is pulled up to open the port and a second sleeve is also pulled up to close port.
In the past frack or other treatment valves operated with a single sleeve that had to be moved in opposed directions to open and close the ports. In some deviated boreholes enough force to shift a sleeve in the downhole direction with set down weight is not available. Sliding sleeve valves were used in pairs or did not have the capacity to be reopened after closing or had other limitations making them unsuitable for treatment is certain applications. The following references are illustrative of some known designs of sliding sleeve valves for borehole treatment operations: U.S. Pat. Nos. 7,591,312; 8,127,847 and US 2009/0139717.
The present invention addresses the issues of the prior designs of sliding sleeve valves for treatment applications in a borehole by providing a tandem sleeve design where the sleeves are pulled uphole. The first sleeve movement opens housing ports and movement of a second sleeve in the same direction moves the second sleeve to where the first sleeve started for the closed position of the ports in the valve housing. The closing sleeve can also be functioned back down in the event the ports in the valve housing need to be reopened. The opening sleeve can be locked in the open position after it is shifted. Known spears using selectively supported collets can be used to shift the opening sleeve and a linkage type shifting tool such as an HB-3 shifting tool from Baker Hughes Incorporated can be used to shift the closing sleeve to close the housing ports. Two HB-3 shifters oriented in mirror image can be used to move the closing sleeve up for closing the housing ports with one shifter and to move the closing sleeve back down to reopen the housing ports.
Those skilled in the art will have a better understanding of the present invention from a review of the description of the preferred embodiment and the associated drawings while recognizing that the full scope of the invention is to be determined from the appended claims.
A bottom hole assembly for performing a borehole treatment has a plurality of ported valve housings where the housings have an assembly of shifting sleeves. The first sleeve is shifted uphole to open the port in the housing and lock the first sleeve in the ports open position. A second sleeve in the same housing is shifted in the same direction as the first sleeve to close the ports in the housing. The second sleeve has profiles for shifting it up to close the housing ports and back down to reopen the housing ports after closing them.
Sleeve 14 is shifted by a known design of a collet type shifter that can support or unsupport collet heads 44 using a j-slot and string manipulation.
Those skilled in the art will appreciate that the use of separate sleeves that shift up allows a piston cylinder assembly such as 50 in a test fixture to apply the necessary force in an uphole direction to move a sleeve. Pulling tension on the coiled tubing is employed to move shifting sleeve 14 with a shifting tool to open ports 42 and sleeve 16 to close the same ports. For reopening any ports 42 weight is set down to move sleeve 16 in a downhole direction. Sleeve 14 stays locked after being initially shifted uphole.
It is preferred to employ an inner string that has the capability in a single trip to shift sleeve 14 up and sleeve 16 up and then down. Sometimes there may be a delay from when all the ports 42 are closed after treatment and when production begins and in that case the inner string is removed with the coiled tubing. Although coiled tubing is preferred, rigid tubing is also envisioned. Other types of known shifting tools can be used to get the requisite movements of the sleeves 14 and 16 in the uphole direction for sequential treatment of a zone with uphole movement of the opening sleeve 14 and the closing sleeve 16. Treatment flow can be through the coiled tubing backstopped by a set resettable packer.
The above description is illustrative of the preferred embodiment and many modifications may be made by those skilled in the art without departing from the invention whose scope is to be determined from the literal and equivalent scope of the claims below:
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