Abstract: A device for damping vibrations of a rotary drill string in motion in a wellbore, a related method, drill string and drill string sub or section, where at least one component of motion of the drill string is communicated to the device, and brake means counter the vibrations, resisting the motion in dependence upon the speed of motion. The device may have an outer sleeve arranged on an inner, tubular body which is rotatably arranged within the outer sleeve. Roller wheels support the sleeve on the wellbore wall and facilitate longitudinal movement of the device and prevent rotational slipping of the outer sleeve relative to the wall upon rotating the tubular body and drill string. One brake part of the brake means on the outer sleeve and another on the tubular body operate to resist rotational vibration components.

Abstract: Methods and an apparatuses are for determining at least one property of a wellbore fluid system. A measurement apparatus having one or more pipe sections is provided, a drilling fluid is communicated through the pipe section, at least one density which is associated with at least one condition of pressure and temperature of the drilling fluid in the pipe section is measured, and the density of the drilling fluid is measured to determine the property of the wellbore fluid system.

Abstract: Methods and an apparatuses are for determining at least one property of a wellbore fluid system. A measurement apparatus having one or more pipe sections is provided, a drilling fluid is communicated through the pipe section, at least one density which is associated with at least one condition of pressure and temperature of the drilling fluid in the pipe section is measured, and the density of the drilling fluid is measured to determine the property of the wellbore fluid system.

Abstract: Methods and apparatus are for producing ammonia. The method has steps of combining hydrogen gas and nitrogen gas in a wellbore to produce ammonia, and extracting the ammonia from the wellbore. The apparatus has at least one production device for combining hydrogen gas and nitrogen gas to produce ammonia, the production device being configured to be disposed downhole in a wellbore for utilising conditions of temperature and pressure in the wellbore to facilitate the production of the ammonia. A method of processing fluid in a process of producing hydrogen or ammonia is exemplified having steps of performing electrolysis of brine or other electrolyte fluid in the wellbore to produce hydrogen gas, and injecting waste fluid from the electrolysis process into a geological formation of the subsurface.

Abstract: A rheological property, for example a thixotropy property, of a fluid such as a drilling fluid, can according to various examples be determined by performing a method that includes providing measurement apparatus having a flowline having a first diameter section and a second diameter section; pumping the drilling fluid along the flowline; measuring at least one differential pressure in the drilling fluid upstream in the second diameter section, using at least one upstream sensor; measuring at least one differential pressure in the drilling fluid downstream in the second diameter section, using at least one downstream sensor; and using the differential pressures from the second diameter section to determine the rheological property and/or the thixotropy property. A method of determining a gelation property of the fluid is also described. Various apparatus for use in determining the rheological property, the thixotropy property, and gelation property are also exemplified.

Abstract: A flowmeter apparatus is for determining a volumetric flowrate for a well flow out from a wellbore, by means of a mass flowmeter, which is configured for receiving well flow and for measuring a mass flow rate of the well flow. At least one mass density measuring apparatus, is fluidly connected to the mass flowmeter upstream of a first inlet or downstream of a first outlet, or both. The mass flow rate of the well flow can be measured using a measuring wheel rotatably arranged below a funnel second section arranged to receive at least a portion of the well flow. A system for determining a volumetric flowrate for a well flow out from a wellbore includes the flowmeter apparatus arranged on a platform, rig, vessel, or other topside location, and connected between a riser and downstream processing equipment.

Abstract: A method is for determining the position of a lower portion of a drill string in a bore hole. The drill string comprises a number of drill string components, each drill string component being interconnected by means of at least one joint. Several ultrasonic sensors are arranged after each other along a drill string. The method comprises localizing the position of the chamfer of the joint relative to the ultrasonic sensors.

Abstract: Method and system for drilling control comprising a plurality of controllers adapted to control performance process parameters, on the basis of driller controls from a driller that provides this as instructions to said controllers, wherein the system further comprises sensors and means for obtaining process values, such as downhole pressure, temperature and torque, wherein the system is adapted to, continuously and/or repeatedly, calculate safeguard envelopes for performance process parameters on the basis of process values and drilling process models and that it is adapted to restrain said controllers from applying performance process parameters outside said safeguard envelopes as a result of driller instructions, and—a method and system for automatically triggering a remedying action in case of an evolving or existing critical situation, comprising calculation of process parameter boundaries which represent a critical condition for the well by using calibrated drilling process models, comprising (i) trigger

Abstract: A device for the pressure regulation of a well is provided with a return pump for drilling fluid. The operating level of drilling fluid in an annulus which is fanned between an outer pipe and an inner pipe is at a height level between the upper portion of the outer pipe and the bottom portion of the well. The return pump is in the annulus.

Abstract: A method is for determining the position of a lower portion of a drill string in a bore hole. The drill string comprises a number of drill string components, each drill string component being interconnected by means of at least one joint. Several ultrasonic sensors are arranged after each other along a drill string. The method comprises localizing the position of the chamfer of the joint relative to the ultrasonic sensors.

Abstract: An earth model comprising a plurality of regions in geological space; associated with each said region in geological space, at least one parameter function defined over a region in parameter space; associated with each region in geological space, at least one transformation which maps coordinates within the region of geological space to coordinates within the region of parameter space. This gridless approach to earth modelling allows much easier alteration of the structural model and the parameter data independently of each other, facilitating multiresolution evaluation of the model as well as easy production of multiple geological interpretations.

Abstract: Method and system for drilling control comprising a plurality of controllers adapted to control performance process parameters, on the basis of driller controls from a driller that provides this as instructions to said controllers, wherein the system further comprises sensors and means for obtaining process values, such as downhole pressure, temperature and torque, where- in the system is adapted to, continuously and/or repeatedly, calculate safeguard envelopes for performance process parameters on the basis of process values and drilling process models and that it is adapted to restrain said controllers from applying performance process parameters outside said safeguard envelopes as a result of driller instructions, and—a method and system for automatically triggering a remedying action in case of an evolving or existing critical situation, comprising calculation of process parameter boundaries which represent a critical condition for the well by using calibrated drilling process models, comprising (i) trigg

Abstract: A device for a borehole arrangement, in which a casing for a borehole is formed of at least one casing section, and in which there is placed at a downhole end portion of the casing at least one downhole tool, for example a drilling tool, wherein the casing is provided with two or more pipe bores, each separately extending continuously through a substantial part of the length of the casing and being separated in a fluid-tight manner from adjacent pipe bores and from an external annulus defined by the external mantle surface of the pipe and a borehole wall.