Abstract:
An expandable pipe section (10'), intended to be joined with a corresponding pipe section (10") for use in connection with a well casing of a production well for hydrocarbons, where the pipe section (10') is configured to be screwed on or off an adjoining expandable pipe section (10"), the pipe section (10') at one end being provided with a male end having externally arranged threads (11") and where the adjoining expandable pipe section (10") is provided with a correspondingly shaped female end having corresponding internal threads (11'). The distance between adjacent threads at their widest point is less than the maximum width of a thread. Those parts of the pipe being provided with threads (11', 11") are provided with at least two step wise arranged parts with a cylindrical surface being coaxially arranged with the pipe wall(s).
Abstract:
A controller for a floating wind turbine is adapted to cause the wind turbine to extract energy from wave-induced motion of the turbine. The controller controls the rotor speed of the turbine by controlling the torque of the load presented to the rotor such that the rotor speed varies in response to wave-induced motion.
Abstract:
A method of measuring the thickness of any deposit of material (28) on an inner wall (12) of a structure (14). The method comprises: (a) causing vibrations in the structure; (b) detecting said vibrations in the structure; (c) determining a resonance frequency of the structure based on the detected vibrations; and (d) determining the thickness of any deposit of material on the inner wall of the structure based on the determined resonance frequency.
Abstract:
A method and apparatus is disclosed for controlling the flow of fluid in oil and/or gas production, involving a control device or an autonomous valve (2) operating by the Bernoulli principle and comprising a moveable disk or body (9) provided within a housing (4) for opening and closing said valve (2), involving use of a material (24) within the valve (2) that changes its properties as to shape and/or volume and/or elastic modulus when exposed to a chemical substance contained in the flow of fluid and thus altering said flow of fluid.
Abstract:
A water injection system that includes a primary water injection line; an injection fluid supply tank; a high pressure injection pump in fluid communication with the injection fluid supply and primary water injection line for pumping injection fluid in injection fluid supply tank through the primary water injection line; a polymer gel supply tank; and a high pressure chemical injection pump in fluid communication with the polymer gel supply tank and the water injection line configured to pump polymer gel having a viscosity of at least about 50,000 cP (at 20°C measured using a Bohlin Rheometer CSR 50, cone and plate measuring system CP 4°/ 40 mm, single shear rate 1/s) in the polymer gel supply tank into the water injection line for mixture with injection fluid is disclosed.
Abstract:
The invention provides a method for the protection of internal filters of LTFT slurry bubble reactor. The method includes the step of activating an emergency back-flush procedure during slow slurry level conditions and/or during increasing temperature of an internal filter.
Abstract:
Provided is a nucleic acid molecule comprising the sequence is set forth in SEQ ID NO:1, the corresponding protein sequence as set forth in SEQ ID NO:2, and variants and functional fragments thereof. Corresponding chimeric genes, vectors and microorganisms are also provided. The protein has a role in the degradation of long-chain n -alkanes and can be used to modify the properties of long-chain n - alkane containing substrates. Methods of using the protein of the invention, e.g. to cause degradation of long-chain n -alkanes are also provided, as are methods of identifying enzymes that are required for the metabolism of a substrate.
Abstract translation:提供了包含SEQ ID NO:1所示序列,SEQ ID NO:2所示的相应蛋白质序列的核酸分子及其变体和功能片段。 还提供了相应的嵌合基因,载体和微生物。 该蛋白质在长链正构烷烃的降解中具有作用,可用于改变含有长链烷烃的底物的性质。 使用本发明的蛋白质的方法,例如, 还提供了长链正构烷烃的降解,以及鉴定底物代谢所需的酶的方法。
Abstract:
The invention provides a method of protecting a hydrocarbon conduit during a period of reduced hydrocarbon flow, said method comprising introducing nitrogen into said conduit during a said period at a pressure p of 1 to 350 bar g and at a rate of (1.5 to 35) .A kg/sec (where A is the internal cross sectional area of the conduit in square metres) for a period of t hours where t = p.d/n where d is the length in km of the conduit from the nitrogen introduction location and n is 10 to 400.
Abstract translation:本发明提供了一种在减少烃流动期间保护烃管道的方法,所述方法包括在压力p为1至350巴克和(1.5至35)的速率的所述期间内将氮气导入所述管道中, a kg / sec(其中A是导管的内部横截面积,以平方米为单位)t小时的时间,其中t = pd / n,其中d是导管从氮气导入位置的长度(km),n 是10到400。
Abstract:
A method of conducting a seismic survey of an area including a region of high seismic velocity regimes in a shallow overburden. According to the method, a zone is identified in which the boundary of the high seismic velocity region has a substantially constant critical angle and a course is plotted through the identified zone. A zone based directional seismic source is applied sequentially, with a directivity angle equal to or close to the measured critical angle. The response is detected using receivers.
Abstract:
A single stage process for desulfurization and ring opening of a sulphur containing hydrocarbon feedstock comprising: contacting said feedstock with hydrogen and a catalyst at a pressure of less than 100 bars wherein said catalyst comprises (I) a combination of molecular sieves consisting of at least one zeolite which has a faujasite structure and at least one fibrous zeolite which comprises essentially non-crossing one-dimensional channels and (II) a composition comprising at least one metal selected from group VIB of the periodic table and at least one metal from group VIII.