Abstract:
Alkaline earth metal scales, especially barium sulfate scale deposits are removed from oilfield pipe and other tubular goods with a scale-removing composition comprising an aqueous alkaline solution having a pH of about 8 to about 14, preferably about 11 to 13, of a polyaminopolycarboxylic acid, preferably EDTA or DTPA and a catalyst or synergist comprising, in particular, oxalate, thiosulfate, nitriloacetate or monocarboxylic acid anions. When the scale-removing solution is contacted with a surface containing a scale deposit, substantially more scale is dissolved at a faster rate than is possible without the synergist.
Abstract:
Organic-swelled layered metal chalcogenides, e.g., titanometallates or silicotitanates, are intercalated with polymeric chalcogenide, e.g., polymeric silica by treatment with organic hydrolyzable polymeric chalcogenide precursor wherein hydrolysis to polymeric chalcogenide is enhanced by removal of organic hydrolysis by-products, during hydrolysis, e.g., by exposure of the reaction mixture to elevated temperatures.
Abstract:
The invention provides a moderate pressure hydrocracking process in which a highly aromatic, substantially dealkylated feedstock is processed directly to high octane gasoline by hydrocracking said feedstock in a hydrocracking zone (18) containing a monofunctional acidic cracking catalyst, preferably comprising a large pore size, crystalline alumino-silicate zeolite hydrocracking catalyst such as zeolite Y. The feedstock is preferably a light cycle oil obtained from a catalytic cracking zone (10) wherein said feedstock has an aromatic content of at least 50, usually at least 60 percent and an API gravity not more than 25. The hydrocracking typically operates at 4240-6900 kPa (600-1000 psig) at moderate to high conversion levels to maximize the production of monocyclic aromatics which provide the requisite octane value to the product gasoline.
Abstract:
A process is disclosed for the conversion of C2-C12 paraffinic hydrocarbons to more valuable petrochemical feedstocks including C2-C4 olefins and C6-C8 aromatics in the presence of a composite catalyst comprising a binder and at least one zeolite having a Constraint Index of between 1 and 12, the composite catalyst having an alpha value of greater than 5 and less than 33. It has been found that yields of valuable C2-C4 olefins and C6-C8 aromatics are increased by maintaining the composite catalyst alpha value within the claimed range.
Abstract:
The present invention relates to specific bitumens that may be used in mixture with block copolymers of the SBS type and oils for the preparation of sealing membranes, characterized in that they are hard bitumens of Newtonian character derived from the treatment of residues in vacuo by propane deasphalting, they have a viscosity of from 560 to 850 s Saybolt furol at 135°C, they present a ''ball and ring'' softening point of between 65 and 74°C, they have a needle penetration at 25°C of 10 to 20/10th of millimetre, and present an asphaltene content of 20 to 35 % by weight. The invention also relates to mixtures that may be used for preparing sealing membranes, and to the membranes thus obtained.
Abstract:
Disclosed is an additive for liquid hydrocarbon fuel composition, particularly diesel fuels. The additive composition is the reaction product of polyalkenyl-substituted succinimides, aldehydes, and triazoles. It also finds use in lubricant compositions.
Abstract:
A synthetic porous crystalline material characterized by an X-ray diffraction pattern exhibiting values substantially as set forth in Table (I) of the specification is prepared from a reaction mixture containing sodium cations, a source of a silica containing at least 30 % by weight solid silica, an oxide of aluminium, water and hexamethyleneimine.
Abstract:
This invention relates to a valve (1) comprising a valve body (2) and a dismountable closing means (3). The closing means (3) comprises a closing member (18) and a support (16) which carries the closing member (18) is received in an inner cavity (6) in the valve body (2). Locking of the closing means (3) in the inner cavity (6) is ensured by means of circular grooves (36a) formed in a side wall (13) of the cavity (6), and movable locking pieces (37) carried by the support (16) and cooperating with an exterior ring (48) via cam elements (50). Axial movement of the ring (48) results in a radial displacement of the locking pieces (37) and thereby connection or disconnection of the closing means (3). A primary use of the arrangement is in subsea oil installations.
Abstract:
Interface arrangement for components such as valves and control units incorporated in subsea stations particularly for hydrocarbon production, in which said components during operation are mounted in fixed positions on the subsea station and are adapted to be retrieved therefrom by means of a remotely operated tool unit (ROT) having a mating interface arrangement to cooperate with that of said components. The upper part of said component (42), which is mounted for retrieval in a substantially vertical direction from its fixed position on the subsea station, is provided with central handling means (49) and one or more coupling members (48). The handling means and the coupling member(s) are adapted to cooperate with respective mating means and members (16, 18A-C) provided on the ROT. Moreover, the handling means is dimensioned for lifting and transporting the component suspended from the ROT. The coupling member(s) are movable up and down in relation to the handling means, when subjected to substantially vertical pull and push forces, respectively, applied from an ROT in operative position connected to the component through the handling means, so as to effect an operation on the component, for example locking or unlocking thereof with respect to the subsea station. The top of the handling means (49) is provided with ports and/or connectors (36B, 37B) for hydraulic, pneumatic, optical or electric interconnection between said component and an ROT.
Abstract:
A link is made between a subsea apparatus (11) and a flowline (16) terminated apart from the apparatus with an upstanding coupling part (17). A flowline link (18) is assembled on the apparatus (11) prior to submerging as a pair of U-shaped flowline pieces (19, 20) with parallel limbs (19', 19'', 20', 20''), one limb of each being joined to the other by a rotatable connection piece (21), the other limb (19'') of piece (19) supporting the link on the apparatus for pivotal motion about the limb axis, possibly by further connecting piece (22), and the other limb (20'') of the piece (20) having a coupling part (23) cooperable with the flowline, the pieces (19, 20) of flowline link being folded against the apparatus while it is lowered. When submerged an ROV (15) pulls and unfolds the flowline piece and aligns the coupling parts (23, 17). The connecting piece (21 and 22) is preferably a fluid joint of the type which permits some swivel in all directions, when energised by fluid pressure supplied by the ROV (15) or apparatus (11).