Abstract:
A saltwater desalination plant with intake-outtake assembly and a method of constructing such intake-outtake assembly are disclosed, where an elongated circular lumen of the intake assembly for collecting saltwater from a saltwater source is formed within an elongated lumen of the outtake assembly for disposing said brine into said saltwater source, in a single infrastructure tunnel.
Abstract:
A method of cleaning a pipeline is performed by introducing a treatment composition comprising a colloidal particle dispersion having inorganic nanoparticles with an average particle size of from 500 nm or less into an interior of a pipeline to be cleaned. A pig or body is passed through the pipeline to spread the composition upon surfaces of the interior of the pipeline. The composition and materials adhering to the surfaces of the interior of the pipeline are removed to facilitate cleaning of the pipeline.
Abstract:
Flowable slush of frozen particles for ice pigging a pipework, comprising an aqueous liquid medium, a multiplicity of frozen particulates of said aqueous liquid medium, a freezing point depressant, selected from a hydroxide ion, said hydroxide ion present in the range of less than 10wt%.
Abstract:
It is a pig launcher (l) comprising a pig magazine (2), launcher mechanism (3) and a connector (7) being connectable to a fluid flow line. The pig magazine (2) is able to hold a number of pigs arranged side by side, control lines (4) being connected to the pig magazine in such a way that each control line (4) is able to provide control fluid to manipulate a pig. The pig launcher further comprises a pig selector (5) being able to receive source control fluid from one control fluid source line (9) and to channel the control fluid to one of a number of control lines (4) being connected to the pig selector, thereby being able to launch one of the number of pigs by means of the control fluid.
Abstract:
A compact subsea pig launcher (16) comprises a tubular magazine (42) for holding a plurality of pipeline pigs (10) in longitudinal succession ready for launching successively into a subsea pipeline. The magazine (42) is shaped to define at least one turn such as a coil around an upright axis. Thus, a series of pigs are stored in longitudinal succession along a path that is curved in plan view around the upright axis. During launching, at least one of the series of pigs is advanced along the path with angular movement around the upright axis.
Abstract:
A method and apparatus for cleaning a fluid conduit (112) in a hydrocarbon production installation. The method comprises providing a composite pipe (104) having a cleaning head (102) coupled to a first end, and introducing the first end of the composite pipe (104) and the cleaning head (102) into a fluid conduit (112) to be cleaned. Fluid is circulated between an annulus (124) between an interior wall of the fluid conduit (112) and the composite pipe (104), through a fluid circulation path defined by the cleaning head. The method comprises running the first end of the composite pipe (104) and the cleaning head (102) into the fluid conduit and cleaning at least one substance from the fluid conduit.A method comprising circulating a heavy fluid through the fluid circulation path to reduce the effective weight of the pipe in the fluid conduit, and another aspect relates to a method comprising generating at least one pressure pulse in fluid in the fluid circulation path while imparting a pulling force or a pushing force on the pipe.
Abstract:
A coupling device (20), a system (50,150,250), and a method for transferring a pig between inner tubes (12) of a jacketed pipes unit (11) (JPU) to clean the inner tubes (12). The coupling device (20) includes a mounting block (30). The mounting block (30) has at least first and second openings (33) extending through the mounting block (30). Each opening (33) is in fluid communication with a corresponding inner tube (12) when the mounting block (30) is mounted to the JPU (11). The coupling device (20) also has a looping conduit (40) connecting two of the inner tubes (12) in serial flow communication. The looping conduit (40) extends between a first loop end (41) mounted to the mounting block (30) about the first opening (33), and a second loop end (42) also mounted to the second surface (32) of the mounting block (30) about the second opening (33). The looping conduit (40) in use transfers the pig from one of the inner tubes (12) of the jacketed pipes unit (11) to another one of the inner tubes (12).
Abstract:
Disclosed is a pig assembly 100 for maintaining a functional line for conveying fluid. In one aspect, the pig assembly 100 includes a larger diameter pig 101 having an internal compartment 112 and at least one smaller diameter pig 110 adapted to fit therein. The larger diameter pig 101 is capable of passing through a larger diameter functional line and the smaller diameter pig 110 is capable of passing through a smaller diameter functional line. In another aspect, a method for maintaining a functional line for conveying fluid is provided which includes pigging a subsea line having at least a larger diameter functional line and a smaller diameter functional line in fluid communication with one another using a pig assembly 100 as described herein.
Abstract:
An apparatus for receiving a pig (12) comprising: a receiver housing (2) arranged to enable connection to a pipeline; a pig retention mechanism (4) mounted within said receiver housing (2), said pig retention mechanism (4) arranged such that it is operable to retain the pig (12) within the housing (2); a first sealing member (6) operable to seal the portion of the receiver housing (2) through which the pig (12) can be removed from the apparatus; a second sealing member (5) operable to seal the portion of the housing (2) that connects said receiver (1) to the pipeline; a fluid inlet (7); and a fluidisation and transportation device (8) arranged to receive the fluidised debris, wherein the apparatus is arranged such that, in use, pressurized fluid is introduced into the enclosed interior of the housing (2) via the fluid inlet in order to fluidise debris which is then removed from the receiver housing (2) via the fluidisation and transportation device (8).
Abstract:
A pipeline pig includes a venturi and a modulating valve located rearward of the inlet side of the venturi. When the valve is in the open position, a predetermined maximum bypass flow is allowed through the venturi. The closed position allows a predetermined minimum bypass flow. The valve may be a poppet-style valve or a frusto-conical shaped stopper. The stopper has sufficient mass and/or aerodynamic drag to overcome the spring force holding the valve in the open position. When the pig stalls, the valve closes and the stopper chokes bypass flow through the venturi. When the pig starts running again, the valve opens as inertia forces the stopper away from the inlet side of the venturi. Also, as friction of the pig increases due to changes in the internal diameter of the pipeline or accumulation of debris ahead of the pig, increased airflow across the valve creates drag.