Weatherford Technology Holdings, LLC

Travis W Massey

Joshua V Symms

Zachary S Trine

Micheal Bock

Ryan Mogensen

Mike Bock

A method for cementing a casing string allows for a deactivation fluid to be injected into a toe of a wellbore in sufficient quantities without displacing cement accumulated in an annulus around the casing string. The method includes landing a first isolation device within a flow path to isolate a shoe track from an annular isolation apparatus and a communication tool. A seal member of the annular isolation apparatus is radially extended around the casing string to fluidly isolate an annulus above the seal member from a toe of the wellbore. A cement slurry is pumped through at least one radial port into the annulus above the seal member without passing through the shoe track. The deactivation fluid is pumped through a bypass mechanism of the first isolation device and into the shoe track while the toe of the wellbore is fluidly isolated from the annulus above the seal member.

Limitless injection shoe

A cementing operation cements casing in a borehole. A bottom plug pumped down the casing ahead of cement lands at a float valve. Circulation of the cement is established through the bottom plug to a shoe track downhole from the float valve. A top plug pumped down the casing behind the cement lands on the bottom plug. An internal component of the float valve is released by building-up pressure in the casing behind the internal component up to a release threshold. The internal component can latch at the shoe. At least some of the cement in the shoe track is displaced from the casing's shoe to the borehole by pumping the plugs and the internal component to the shoe. With the cement displaced out of the shoe track, the time required to drill out the assembly can be greatly reduced.

Displaceable shoe track assembly

A multistage cementing assembly is used for cementing casing in a borehole. A subsurface tool on the casing holds a subsurface plug therein using a temporary retainer. The subsurface plug is located in a subsurface location below one or more stage tools or cementing collars on the casing. First stage cement passing down the casing can pass through a passage of the subsurface plug to flow out of a float valve. A wiper plug passed through the casing behind the cement is then engaged with the subsurface plug. Pressure buildup can release the two plugs as a unit from the temporary retainer. Before reaching the float valve, a deformable ring on the subsurface plug can engage in a locator ring on the casing to indicate the plug unit's location during operations. Eventually, additional stages can be cemented using the one or more stage tools uphole on the casing.

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Houston, TX, United States of America

Travis W Massey