Abstract: In a method of sealing a fracture (1) in a formation (2) surrounding a wellbore provided with a non-cemented perforated liner (4), a placement tool (6) is introduced into the liner, and a first and second annular flow barrier (8, 9) create an upstream (10), an intermediate (11) and a downstream section (12). A cross flow shunt tube (13) connects the upstream section and the downstream section, and a sealing fluid outlet (14) is arranged in the intermediate section. A placement fluid is caused to flow into the fracture and controlled to obtain a desired fluid flow in an annular space between the liner and the formation that is directed in downstream direction at a position upstream the fracture and in the upstream direction at a position downstream the fracture. When said desired flow is obtained, sealing fluid is ejected from the sealing fluid outlet. A sealing system is furthermore disclosed.

Abstract: In a wellbore (1) provided with a non-cemented perforated liner (6) forming a continuous annular space (7) between the liner and the formation (2), the liner having an original perforation pattern being optimized for acid stimulation of the wellbore, the following steps are performed: injecting a hydrocarbon displacement fluid and measuring parameters relevant for inflow profiling, on the basis thereof, determining an actual inflow profile (P a) over the length of the wellbore, comparing the determined actual inflow profile (Pa) with a preferred inflow profile (Pp) over the length of the wellbore, estimating, on the basis of the difference between the actual inflow profile (Pa) and the preferred inflow profile (Pp), a modified perforation pattern for the liner, determining how the original perforation pattern of the liner may be adapted to form said modified perforation pattern for the liner, and adapting the perforation pattern of the liner accordingly.

Abstract: In a method of sealing a fracture (1) in a formation (2) surrounding a wellbore provided with a non-cemented perforated liner (4), a placement tool (6) is introduced into the liner and so positioned that a sealing fluid outlet (7) of the placement tool is located at the fracture (1). A placement section (8) including the sealing fluid outlet is pressed against the liner. A placement fluid is caused to flow into the fracture and controlled to obtain a desired fluid flow in an annular space (5) between the liner and the formation that is directed in downstream direction at a position upstream the fracture and that is directed in upstream direction at a position downstream the fracture. When said desired flow is obtained, sealing fluid is ejected from the sealing fluid outlet. A sealing system is furthermore disclosed.

Abstract: In a method of sealing a fracture (1) in a formation (2) surrounding a wellbore provided with a non-cemented perforated liner (4), a placement tool (6) is introduced into the liner, and a first and second annular flow barrier (8, 9) create an upstream (10), an intermediate (11) and a downstream section (12). A cross flow shunt tube (13) connects the upstream section and the downstream section, and a sealing fluid outlet (14) is arranged in the intermediate section. A placement fluid is caused to flow into the fracture and controlled to obtain a desired fluid flow in an annular space between the liner and the formation that is directed in downstream direction at a position upstream the fracture and in the upstream direction at a position downstream the fracture. When said desired flow is obtained, sealing fluid is ejected from the sealing fluid outlet. A sealing system is furthermore disclosed.

Abstract: In a method of sealing a fracture (1) in a formation (2) surrounding a wellbore provided with a non-cemented perforated liner (4), a placement tool (6) is introduced into the liner and so positioned that a sealing fluid outlet (7) of the placement tool is located at the fracture (1). A placement section (8) including the sealing fluid outlet is pressed against the liner. A placement fluid is caused to flow into the fracture and controlled to obtain a desired fluid flow in an annular space (5) between the liner and the formation that is directed in downstream direction at a position upstream the fracture and that is directed in upstream direction at a position downstream the fracture. When said desired flow is obtained, sealing fluid is ejected from the sealing fluid outlet. A sealing system is furthermore disclosed.

Abstract: In a wellbore (1) provided with a non-cemented perforated liner (6) forming a continuous annular space (7) between the liner and the formation (2), the liner having an original perforation pattern being optimized for acid stimulation of the wellbore, the following steps are performed: injecting a hydrocarbon displacement fluid and measuring parameters relevant for inflow profiling, on the basis thereof, determining an actual inflow profile (P a) over the length of the wellbore, comparing the determined actual inflow profile (Pa) with a preferred inflow profile (Pp) over the length of the wellbore, estimating, on the basis of the difference between the actual inflow profile (Pa) and the preferred inflow profile (Pp), a modified perforation pattern for the liner, determining how the original perforation pattern of the liner may be adapted to form said modified perforation pattern for the liner, and adapting the perforation pattern of the liner accordingly.

Abstract: An assembly for producing oil and/or gas through a well traversing stacked oil and/or gas bearing earth layers comprises a series of expandable packers and integrated perforating gun and sandscreen assemblies mounted on a production tubing such that each integrated perforating gun and sandscreen assembly is located adjacent an oil and/or gas bearing earth layer and at least one expandable packer is located between a pair of adjacent oil and/or gas bearing earth layers, and at least one inflow opening arranged in the wall of the production tubing adjacent to each sandscreen assembly. The integrated perforating gun and sandscreen assemblies are installed in a single run into the well such that uncontrolled fluid and/or sand influx into the well before installation of the sandscreens and expandable packers is avoided.

Abstract: An assembly for producing oil and/or gas through a well traversing stacked oil and/or gas bearing earth layers comprises a series of expandable packers and integrated perforating gun and sandscreen assemblies mounted on a production tubing such that each integrated perforating gun and sandscreen assembly is located adjacent an oil and/or gas bearing earth layer and at least one expandable packer is located between a pair of adjacent oil and/or gas bearing earth layers, and at least one inflow opening arranged in the wall of the production tubing adjacent to each sandscreen assembly. The integrated perforating gun and sandscreen assemblies are installed in a single run into the well such that uncontrolled fluid and/or sand influx into the well before installation of the sandscreens and expandable packers is avoided.