An offshore well-processing system includes a mobile offshore drilling unit and a remote well-processing device configured to be positioned on an offshore platform different from the mobile offshore drilling unit, the mobile offshore drilling unit defining at least one well centre and comprising at least one primary drill rig including at least one drill floor and at least one hoisting system for raising and lowering tubular equipment through the at least one well centre from/into a well in the seafloor. The mobile offshore drilling unit and the remote well-processing device are configured to be operationally coupled to each other; and the mobile offshore drilling unit is configured to assist in performing concurrent well-processing tasks on respective wells, including the first well processing task performed by the remote well-processing device on a first well and a second well-processing task concurrently performed by the offshore well-processing system on a second well.

The present invention relates to methods and systems for establishing a well foundation as well as for drilling and installation of a surface casing without any use of a drilling rig.

The present invention relates to methods and systems for establishing a well foundation as well as for drilling and installation of a surface casing without any use of a drilling rig.

A system for operation on a subsea well, the system comprising at least one storage unit configured to store tubulars; a subsea mast unit comprising at least two string handling devices configured to handle a tubular string of a plurality of connected tubulars, wherein at least one of the string handling devices is configured to move vertically relative to the other of the string handling devices, and is configured to add a vertical downforce to the tubular string; and at least one handling arrangement for moving tubulars between the at least one storage unit and one of the string handling devices simultaneously with handling of the tubular string by at least one of the string handling devices. A method of lowering a tubular string into a subsea well is also provided.

A system for operation on a subsea well, the system comprising at least one storage unit configured to store tubulars; a subsea mast unit comprising at least two string handling devices configured to handle a tubular string of a plurality of connected tubulars, wherein at least one of the string handling devices is configured to move vertically relative to the other of the string handling devices, and is configured to add a vertical downforce to the tubular string; and at least one handling arrangement for moving tubulars between the at least one storage unit and one of the string handling devices simultaneously with handling of the tubular string by at least one of the string handling devices. A method of lowering a tubular string into a subsea well is also provided.

A subsea vertical drilling machine is disclosed, having: a drill assembly formed by: a riser pipe having a first end, a second end, and a length extending between the first and second ends; and a drilling machine body, including a drilling head, coupled to the first end of the riser pipe;
and a vertical feed system configured for advancing the drill assembly in a vertical direction. The riser pipe is provided with at least one rack extending along at least a part of the length of the riser pipe, and the vertical feed system comprises a motor coupled to a pinion, the pinion arranged for engaging with the rack for advancing the drill assembly.

A subsea vertical drilling machine is disclosed, having: a drill assembly formed by: a riser pipe having a first end, a second end, and a length extending between the first and second ends; and a drilling machine body, including a drilling head, coupled to the first end of the riser pipe;
and a vertical feed system configured for advancing the drill assembly in a vertical direction. The riser pipe is provided with at least one rack extending along at least a part of the length of the riser pipe, and the vertical feed system comprises a motor coupled to a pinion, the pinion arranged for engaging with the rack for advancing the drill assembly.

The invention relates to an underwater drilling device and to a method for procuring drill cores of a bed of a body of water, wherein an underwater drilling device with a base frame is lowered in a body of water and placed on a bed of a body of water. A drill string consisting of at least one tubular drill string element is drilled out into the bed of the body of water in a first drilling step with a drill drive, with a drill core being formed in a receptacle in the tubular drill string element and being received in a core barrel in the drill string element. According to the invention, the drill core is enclosed in pressure-tight manner in a receiving container on the basic cradle under water.

The invention relates to an underwater drilling device and to a method for procuring drill cores of a bed of a body of water, wherein an underwater drilling device with a base frame is lowered in a body of water and placed on a bed of a body of water. A drill string consisting of at least one tubular drill string element is drilled out into the bed of the body of water in a first drilling step with a drill drive, with a drill core being formed in a receptacle in the tubular drill string element and being received in a core barrel in the drill string element. According to the invention, the drill core is enclosed in pressure-tight manner in a receiving container on the basic cradle under water.

A drilling platform for amphibious operations includes: a base, wherein drive tracks are arranged on both sides of the base, a propeller is disposed at a rear end of the base, and a driving assembly is disposed inside the base; two support cylinders are respectively disposed at two ends of the base; each of the support cylinders contains a sub-cylinder; a pushing cylinder is arranged on a bottom surface of the partition plate; a buoyancy adjustment assembly is provided at a bottom of the base, so as to provide buoyancy support for the base when the base is transferred from land to water. The present invention is suitable for drilling construction of pile foundations of water and land buildings, bridge piers, and transmission line electric tower pile foundations, as well as drilling of oil wells, wherein the drilling platform construction process at different drilling points is omitted.