Method and Apparatus for Cementing a Liner in a Borehole Using a Tubular Member Having an Obstruction

Abstract

An open hole is drilled with coiled tubing that has an electric line. At the conclusion of drilling the drilling bottom hole assembly is removed and a liner running tool is connected between the coiled tubing and the liner. The electric line remains in the coiled tubing but spacers can be added to keep the lower end of the electric line away from the running tool. A wiper plug has a passage therethrough and a movable stinger that can hold open a pair of flapper valves. The liner is released from the running tool and cement is delivered through the stinger with a bit of excess that is above the running tool. The lifting of the stinger with the coiled tubing closes the flappers and allows circulation out of excess cement. Setting down on the coiled tubing allows a seal to re-engage in the deployment sleeve, allowing pressure to be placed against the wiper plug, such that it can be launched to displace the remaining cement within the liner into the annulus around the liner.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of U.S. patent application Ser. No. 12 / 640,942, filed Dec. 17, 2009, which claims the benefit of U.S. Provisional Application Ser. No. 61 / 203,567, filed Dec. 23, 2008, the teachings of which are incorporated herein by reference in their entirety and U.S. patent application Ser. No. 12 / 637,105, filed Dec. 14, 2009, which claims the benefit of U.S. Provisional Application Ser. No. 61 / 122,914, Dec. 16, 2008.FIELD OF THE INVENTION[0002]The present invention relates to a method and apparatus for cementing a liner in place in an open borehole using a tubular member having an obstruction in the tubular member where cement is passed through the tubular member into the liner and through the liner into an annular space surrounding the liner to position the liner in the open borehole. More particularly the invention relates to liner cementing of a well drilled with electric line coiled tubing using the same coiled t...

AI Technical Summary

Benefits of technology

The present invention provides a method and apparatus for cementing a liner in an open borehole extending from a wellbore. The method involves injecting cement into the liner through a tubular member with at least one obstruction, and then using a cement cleanout fluid to displace the cement and remove any contaminated cement from the wellbore. The apparatus includes a liner running tool and a liner wiper plug for use in the cementing process. The technical effects of this invention include improved cementing efficiency and reduced risk of contamination during cementing operations.

Problems solved by technology

Unfortunately this procedure is not suitable for use with a tubular member containing an obstruction, since the obstruction inhibits or otherwise prohibits travel of the tubular member wiper dart.

It will be immediately apparent that the procedure just discussed is not effective to cement liners in wells using a tubular member, including a wire, since the wire makes it impossible to pass the tubular member wiper dart through the tubular member.

Similarly drillpipe, which is also a suitable tubular member, is not effective when the drillpipe includes an obstruction which makes it impossible to use a drillpipe member wiper dart.

This has been a necessary operation and can be quite expensive and time consuming.

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