Abstract: A cement plug is for plugging an annular region between a first casing and a second casing in a well. A method includes: perforating the first casing to open a flow path to the annular region; providing a magnetorheological cementitious slurry; inducing a magnetic field for affecting the physical properties of the magnetorheological cementitious slurry and for defining a lower boundary for the cement plug; feeding the magnetorheological cementitious slurry into the annular region through a perforation in the first casing; and impeding the mobility of the magnetorheological cementitious slurry in the annular region by exposing it to the magnetic field such that the magnetorheological cementitious slurry may consolidate substantially at the lower boundary without the need for a base device in the annular region.

Abstract: A system is for pressure testing a barrier in a well from below. The system has a first barrier, a second barrier located below the first barrier in the wellbore, a confined testing space located between said first and second barriers in the well, and a fluid reservoir. The system further has a pressurizing member for pressurizing fluid from said fluid reservoir and for transferring said pressurized fluid into said confined testing space, a pressure sensor for measuring pressure in relation to said confined space; and a pressure data receiver for receiving data from said pressure sensor. There is also described a method for pressure testing a barrier in a well from below.

Abstract: A device is for directing a fluid flow in an annulus around a pipe string in a horizontal or deviated well. The device has an orientation sensing member adapted to distinguish between the high-side and the low-side of the borehole along the well path. A fluid direction member is adapted to impede the fluid flow in one portion of the annulus so as to at the same time increase the fluid flow in another portion of the annulus; and an activation member for activating the fluid direction member in the well.

Abstract: A system is for pressure testing a barrier in a well from below. The system has a first barrier, a second barrier located below the first barrier in the wellbore, a confined testing space located between said first and second barriers in the well, and a fluid reservoir. The system further has a pressurizing member for pressurizing fluid from said fluid reservoir and for transferring said pressurized fluid into said confined testing space, a pressure sensor for measuring pressure in relation to said confined space; and a pressure data receiver for receiving data from said pressure sensor. There is also described a method for pressure testing a barrier in a well from below.

Abstract: A cement plug is for plugging an annular region between a first casing and a second casing in a well. A method includes: perforating the first casing to open a flow path to the annular region; providing a magnetorheological cementitious slurry; inducing a magnetic field for affecting the physical properties of the magnetorheological cementitious slurry and for defining a lower boundary for the cement plug; feeding the magnetorheological cementitious slurry into the annular region through a perforation in the first casing; and impeding the mobility of the magnetorheological cementitious slurry in the annular region by exposing it to the magnetic field such that the magnetorheological cementitious slurry may consolidate substantially at the lower boundary without the need for a base device in the annular region.

Abstract: A device is for directing a fluid flow in an annulus around a pipe string in a horizontal or deviated well. The device has an orientation sensing member adapted to distinguish between the high-side and the low-side of the borehole along the well path. A fluid direction member is adapted to impede the fluid flow in one portion of the annulus so as to at the same time increase the fluid flow in another portion of the annulus; and an activation member for activating the fluid direction member in the well. A pipe string has a device according to the invention, as well as a method for operating a device according to the invention.