Abstract: A downhole communication system for communication between a first and second location in a subsea oil and/or gas well installation. The oil and/or gas well installation comprises out of hole metallic structure comprising a riser 3 running upwards away from the mudline ML, and downhole metallic structure 2 running down into the well. The communication system is arranged so that at least part of a signal path for communications between the first and second locations is provided by the downhole metallic structure 2 such that, in use, data to be communicated between the first and second locations is carried by electrical signals in the downhole metallic structure 2.

Abstract: Well installations and methods for constructing wireless ready well installations. The installations comprise downhole metallic structure (2) and downhole repeater apparatus (5) for receiving signals and in response transmitting signals onwards. The repeater apparatus (5) are arranged for at least one of receiving the signals by picking up at least one of electrical and acoustic signals from the downhole metallic structure and transmitting the signals onwards by applying at least one of electrical and acoustic signals to the downhole metallic structure. Various arrangement and methods are described to allow provision of well installations ready for wireless communications.

Abstract: Apparatus (100) for use in sensing temperature along a wellbore, comprising: tubing (110) comprising a plurality of temperature sensor modules (120) provided at locations along the inside of the tubing, having electrical properties that vary with temperature; and an electrical network (115) comprising a plurality of wires and said plural temperature sensor modules, wherein the wires and plural temperature sensor modules are configured as a matrix by which the wires comprise a first group of wires and a second, different group of wires and each wire of the first group is electrically connected to each wire of the second group once, by different temperature sensor modules, such that each temperature sensor module can be individually electrically connected by a pair of wires comprising a first wire from the first group and a second wire from the second group.

Abstract: A utility drop light having a shield for directing light in a particular direction and preventing the light from shining in the user's eyes is provided according to the invention. The utility drop light includes a translucent light tube having a first end and a second end, a light source positioned within the translucent light tube between the first and second ends thereof, and a light shield extending from the first end of the translucent light tube to the second end of the translucent light tube. The light shield is positioned between the translucent light tube and the light source. The light shield is rotatable relative to the light tube and is weighted such that the light shield is always positioned above the light source relative to the earth.

Abstract: A well (10) in a geological structure, the well (10) comprising a first casing string (12a) with a second casing string (12b) partially inside, and a third casing string (13c) partially inside the second casing string (12b). A first inter-casing annulus (14a) is defined between the first (12a) and second casing strings (12b), and a second inter-casing annulus (14b) is defined between the second (12b) and third casing strings (12c). A primary fluid flow control device (16a), such as a wirelessly controllable valve, on the second casing provides (12b) fluid communication between the first inter-casing annulus (14a) and the second inter-casing annulus (14b); and a secondary fluid flow control device (16b), such as a second wirelessly controllable valve, on the third casing string (12c) provides fluid communication between the second inter-casing annulus (14b) and a bore of the third casing (14c).

Abstract: The inventive concept relates to a method for manufacturing a metal based component (100, 200) having a cavity (103, 203). The method comprises the steps of: providing a plurality of individual segments (110, 210) corresponding to different portions of the metal based component; arranging the plurality of segments in a stack (120, 220) in such a way that the shape of the stack corresponds to the shape of the metal based component, and that a void (130, 230) is formed in the stack, wherein the shape of at least a portion of the void corresponds to the shape of the cavity; filling at least the first 10 portion of the void with an incompressible filler (140, 240); removing gas from the stack; subjecting the stack to a hot pressing process to form the metal based component comprising the cavity; removing at least a part of the incompressible filler from the metal based component.

Abstract: A method for coating a metal based component surface wherein said metal based component has an inner and/or outer surface portion that is to be coated, and which surface portion comprises a carbide forming composition. A cavity having one or more cavity walls, wherein said at least one inner and/or outer surface portion forms at least a portion of said one or more cavity walls is provided, and a portion of the cavity is filled with diamond powder. Thereafter gas is removed from the interface between said diamond powder and said at least one inner and/or outer surface portion, and the cavity is subjected to a hot pressing process for a predetermined time at a predetermined pressure and a predetermined temperature such that said diamond powder diffusion bonds to said at least one one inner and/or outer surface portion. Finally at least a part of said diamond powder is removed from said at least one cavity.

Abstract: A downhole apparatus and method for expelling fluid which comprises a container defining a void which is separated into three separate sections by a floating piston and control member, each having a dynamic seal. A portion of the container defining one of the void sections has a different cross-sectional area than the portion of the container defining another void section. In use, a fluid to be expelled is provided in one void section, and a reduced pressure (compared to the well) is sealed in another void section. The apparatus also comprises a wireless electromagnetic or acoustic receiver. When a signal is received by the wireless receiver to activate the apparatus, a valve or other mechanism maybe activated to release the floating piston and connected control member such that the lower pressure void and differing cross-sectional areas of the container drives and expels fluid out of the apparatus.

Abstract: Apparatus (100) for use in sensing temperature along a wellbore, comprising: tubing (110) comprising at least 6 temperature sensor modules (120) provided at locations along the inside of the tubing, each temperature sensor module comprising a temperature sensor comprising a crystal oscillator having an electrical oscillation frequency that varies with temperature; the tubing having an external diameter of less than 14 mm at the location of at least 6 temperature sensor modules.

Abstract: Downhole electrical energy harvesting and communication in systems for well installations having metallic structure carrying electric current, for example CP current. In some instances there is a harvesting module (4) electrically connected to the metallic structure (2) at a first location and to a second location spaced from the first location, the first and second locations being chosen such that, in use, there is a potential difference therebetween due to the electric current flowing in the structure (2); and the harvesting module (4) being arranged to harvest electrical energy from the electric current. In addition or alternatively, there may be communication apparatus (4, 5, 6) for communication by modulation of the current, for example CP current, in the metallic structure (2).

Abstract: The inventive concept relates to a method for manufacturing a metal based frame comprising the steps of: providing a first element (202) comprising a first element inner enveloping wall (204) surrounding an interior volume; providing a second element (210) having a second element outer wall (212), a second element inner wall (213), and a third element (220) having a third element outer wall (222), a third element inner wall, wherein the second element inner wall (213)and the third element inner wall each surrounds a free space (215); arranging the second element (210) and the third element (220) in the interior volume (208) such that an intermediate space (230) having an access opening (232) is formed between the first element inner enveloping wall (204) and the second element outer wall (212) and the third element outer wall (222) in a predetermined pattern; arranging a plurality of pieces of a wrought material (250) in the intermediate space (230); providing a closing member (240) arranged such that it cove

Abstract: A method of controlling a well in a geological structure, the well comprising: a first casing string (12a), and a second casing string (12b) at least partially inside the first casing string thus defining a first inter-casing annulus therebetween. A primary fluid flow control device (16a), such as a wirelessly controllable valve, is provided in the second casing string (12b) to provide fluid communication between the first inter-casing annulus (14a) and a bore (14b) of the second casing string (12b). In the event of well “blow-out”, a relief well (40) may be drilled and a fluid communication path formed between the relief well and the first casing string of the well rather than extend to lower and/or narrower sections of casing. A kill fluid can then be introduced via the relief well (40) and the primary fluid flow control device (16a) used to direct fluid to the second casing bore (14b).

Abstract: The invention relates to a method for manufacturing a solid metal based component. The method comprising the steps of providing a plurality of metal based sheets; arranging the plurality of metal based sheets in a stack, 5 wherein the stack comprises a first metal based sheet, a last metal based sheet and at least one intermediate metal based sheet; perimetrically sealing at least a portion of the stack forming at least one cavity inside of the stack; removing gas from said at least one cavity, and subjecting the stack to a hot isostatic pressing process for a predetermined time at a predetermined 10 pressure and a predetermined temperature so that the plurality of metal based sheets of the stack bond metallurgically to each other to form a solid metal based component. The invention further relates to a single-piece metal based component.

Abstract: A well (10) in a geological structure (11), the well (10) comprising: a first casing string (12a) and a second casing string (12b) inside the first casing string (12a) and defining a first inter-casing annulus (14a) therebetween. A wirelessly controllable valve (16a), in the second casing string (12b) provides fluid communication between the first inter-casing annulus (14a) and a second casing bore (14b). The first or second casing string are less than 250 meters longer in length than the second or first casing string respectively and may be the same length. The distal ends of the first and second casing strings may be in a substantially impermeable formation (11). A number of benefits can be realised from such an arrangement. For example, in the event of a “blow-out”, kill fluid may be introduced into the well bore without the need to drill a relief well.

Abstract: A method to test or monitor the integrity of a cement barrier, comprising providing an assembly therebelow including: a perforating device; a control mechanism to control the perforating device, a pressure sensor, a wireless communication device and a pressure sensor. The perforating device is activated to perforate casing below the barrier and a pressure test may be conducted. The creation of the perforation(s) below the barrier allows an assessment of the integrity of the barrier across its entire width, and especially its bond to the formation, rather than only a central portion of the barrier. Electromagnetic or acoustic wireless signals are used to retrieve data from below the barrier.

Abstract: A utility drop light having a shield for directing light in a particular direction and preventing the light from shining in the user's eyes is provided according to the invention. The utility drop light includes a translucent light tube having a first end and a second end, a light source positioned within the translucent light tube between the first and second ends thereof, and a light shield extending from the first end of the translucent light tube to the second end of the translucent light tube. The light shield is positioned between the translucent light tube and the light source. The light shield is rotatable relative to the light tube and is weighted such that the light shield is always positioned above the light source relative to the earth.

Abstract: A monitoring well installation comprising metallic casing (2) running down from the surface into a borehole and a sealing material plug (6) provided downhole for blocking the interior of the casing and sealing the borehole against the egress of fluid from a zone below the plug. There is an axial spacing (2A) between adjacent casing portions (2) in the region of the plug (6) such that there is an uncased length of borehole in which the material of the plug seals against the formation. There is provided a sensing tool (3) located below the plug (6) for sensing at least one parameter below the plug (6) and a communication arrangement (3, 4, 5) for use in transmitting data from the sensing tool (3) towards the surface. The communication arrangement comprises across plug communication apparatus (5) for facilitating transmission of signals carrying data across the plug (6) towards the surface.

Abstract: A downhole power delivery system for use in a well comprising downhole metallic pipe (2) running in a borehole of the well with a downhole sealing plug (31) provided in a bore or annulus at least partly defined by the downhole metallic pipe. The power delivery system comprising below plug apparatus (5) located in the borehole below the plug (31) including a downhole device (53) requiring electrical power and downhole power supply apparatus (6) located in the borehole above the plug (31). The power supply apparatus (6) comprises at least one battery (64) for powering the downhole device and the downhole power supply apparatus (6) and below plug apparatus (5) being arranged for delivering electrical power from the downhole power supply apparatus (6) to the downhole device (53) across the downhole sealing plug (31).

Abstract: A well installation comprising downhole power delivery apparatus for delivering electrical power from a surface power source S to a downhole tool T. The well installation comprises downhole metallic structure (2) running down into a borehole. The apparatus comprises an electrical cable (3) for carrying electrical power from the surface power source S, a power transfer arrangement (4) and a power pick up arrangement (5). The cable 3 runs down into the borehole together with the metallic structure (2) to the power transfer arrangement (4) which is provided at a first downhole location for transferring electrical power carried by the electrical cable (3) onto the downhole metallic structure (2) for onward conduction. The power pick up arrangement (5) is provided at a second downhole location, spaced from the first, for picking up electrical power from the downhole metallic structure (2) for supply to the downhole tool T.

Abstract: Downhole electrical energy harvesting and communication in systems for well installations having metallic structure carrying electric current, for example CP current. In some instances there is a harvesting module (4) electrically connected to the metallic structure (2) at a first location and to a second location spaced from the first location, the first and second locations being chosen such that, in use, there is a potential difference therebetween due to the electric current flowing in the structure (2); and the harvesting module (4) being arranged to harvest electrical energy from the electric current. In addition or alternatively, there may be communication apparatus (4, 5, 6) for communication by modulation of the current, for example CP current, in the metallic structure (2).