Showing papers by "Mobil published in 2003"

Measurement and Modeling of End Group Concentration Depth Profiles for ω-Fluorosilane Polystyrene and Its Blends

Abstract: Angle-dependent X-ray photoelectron spectroscopy (ADXPS) is used to measure end group concentration depth profiles for blends of surface active ω-fluorosilane polystyrene with nonfunctional polystyrene. The fluorine signal is in all cases enhanced at the surface, indicating surface segregation of the lower surface tension fluorosilane end groups. End group segregation is enhanced by an increase in the concentration of ω-fluorosilane polystyrene, an increase in the nonfunctional polystyrene molecular weight, or a decrease in the molecular weight of the ω-fluorosilane polystyrene. A self-consistent mean-field lattice theory is developed to model the surface structure and properties of blends containing end-functional polymers. Lattice model calculations provide estimates of concentration depth profiles as a function of the blend composition, the normalized chain lengths of the blend constituents, and the surface and bulk interaction parameters, χs and χb, respectively. Two end-functional polystyrene archite...

Migration effects on the composition of hydrocarbon accumulations in the OML 67–70 areas of the Niger Delta

Abstract: Systematic changes in gas-oil ratios in the OML 67–70 area (joint venture acreage) of the Niger Delta (Nigeria) illustrate the effects of hydrocarbon migration on the compositional changes observed in the accumulations over large depth intervals. One interpretation is that the reservoirs are currently both filling and leaking hydrocarbons, indicating that trap styles affect the migration pathways in this region of the Niger Delta. The accumulations are more liquid prone with depth, based on the bubble point of the fluids in the reservoir. Applying these results to regional exploration opportunities indicates that fluid contacts in the normally pressured section are controlled by leaking seals (class III traps). The potential exists for pressure-controlled filled-to-spill traps (class II traps) in the overpressured section, where a high-quality seal impedes the vertical flux of hydrocarbon fluids. Although these conclusions apply to a specific portion of the Niger Delta, combining the concept of trap style with compositional changes resulting from migration processes is useful in identifying new play concepts and opportunities in other regions of the world.

Holding device for fixing an electronic component

Abstract: The invention relates to a holding device for fixing an electronic component in a wheel. The holding device comprises at least one device carrier (5) for receiving and holding electronic components (6) and also comprises at least one at least partially elastic damper foot (7) which is permanently flexibly connected to the tyre covering (1). The damper foot (7) has a dampening effect and is configured in such a way that it is elastic and tapered along the longitudinal axis thereof. The damper foot (7) can be fixed to the device carrier (5) and the tyre covering (1) by adhesion or vulcanization, for example. In other embodiments, the damper foot (7) is also produced with the device carrier and the tyre covering in a single piece made of tyre material. Preferably, the damper foot can conduct heat and energy and contains a capacitive or inductive coupling for connecting two electronic components (6) or an antenna.

Covers for posts and W-beams of guardrails

Abstract: A covering piece for posts and metallic strips of guardrails, consisting of a part (1) having a body (2) provided with a rectangular plan hollow area (3) in its inner zone, provided with a longitudinal slit (4) provided with a quick cover flange, the metallic strip being covered by a piece (11) having a body (12) and a longitudinal slit (13) formed by a quick cover flange, having a hollow zone (14) in which the metallic strip (20) is coupled.

A novel BLAST detection algorithm based instantaneous error ordering

Abstract: Space-time transmission techniques, which make full use of the rich scattering channel with multiple transmit and receive antennas, can greatly increase the spectral efficiency. The conventional V-BLAST (Bell laboratories layered space-time) detection algorithm estimate symbols with the expected SNRs ordering. In this paper, a novel BLAST detection algorithm based instantaneous error ordering (IEO-BLAST) is proposed. The proposed BLAST detection algorithm obtains the additional diversity with instantaneous error ordering and reduces the effect of the error propagation. Therefore, the performance of the BLAST architecture is greatly improved. In addition, the simplified version of IEO-BLAST detection algorithm (SIEO-BLAST) is derived. And the performance of simplified algorithm has little degradation. The selection capacity (SC) is defined to represent the performance of the algorithm with successive interference cancellation.

Assembly profile for automotive trailer or retro-fit automotive superstructure

Abstract: An enclosed automotive trailer has horizontal and vertical body panels which are linked at their edges by an essentially L-shaped profile (1). Following presentation of the panels to the receiving grooves (14, 15), the panels are locked in place by further L-shaped profiles (10a, 10b).

Coupling of a sensor element to a transponder

Abstract: The invention relates to the coupling of a sensor element to a transponder, the connection of said sensor element to the transponder being achieved by capacitive or inductive coupling. This enables any separation layer that may lie between the sensor element and the transponder to be retained, allowing the invention to be advantageously used in gas and liquid-tight containers, such as tyres. In addition, electrically non-conductive materials of the object to be measured can be used as a dielectric for the capacitive coupling and electrically conductive parts can form part of a conductor loop for the inductive coupling.

The Malory Field, Block 48/12d, UK North Sea

Abstract: The Malory Field straddles blocks 48/12d and 48/12c of the UK Sector of the Southern North Sea on the western margin of the Sole Pit Trough. The field is located within an upthrown part of the Dowsing Fault Zone and was discovered by the Mobil operated well 48/12d-9 in early 1997. The Malory Field is a small fault-bounded horst structure with expected recoverable reserves of 75 BSCF. The reservoir consists of a 249 ft-section of Lower Permian, Rotliegendes Leman Sandstone Formation sandstones, is sourced from the Carboniferous Westphalian Coal Measures below, and is sealed by overlying Upper Permian Zechstein evaporites. Reservoir quality is generally good with an average porosity of 14.7% and core permeabilities (Kh) between 0.2 and 1651 mD. This preservation of reservoir quality is attributed to a combination of the structure being located on a broad palaeostructural high, with a lower maximum burial depth than adjacent structures and associated lower compactional porosity loss, the presence of an early hydrocarbon charge and the preferential precipitation of chlorite over illite cements.

Ankopplung eines sensorelements an einen transponder

Abstract: Die Erfindung betrifft eine Ankopplung eines Sensorelements an einen Transponder, bei wel-cher die Anbindung des Sensorelementelements an den Transponder durch kapazitive Ankopplung oder induktive Kopplung realisiert ist. Dabei kann eine zwischen Sensorelement und Transponder eventuell liegende Trennschicht beibehalten werden, so dass die Erfindung bei gas- und flussigkeitsdichten Behaltnissen, wie Reifen, vorteilhaft eingesetzt werden kann. Ferner konnen elektrisch nicht leitende Materialien des Messobjekts als Dielektrikum fur die kapazitive Kopplung und elektrisch leitende Teile als Teil einer Leiterschleife fur die induktive Kopplung verwendet werden.

Fatigue Design Of Driven Piles For Deepwater Applications

Abstract: Some codes of practice call for the consideration of the fatigue damage caused to piles during both installation and inplace operations However, no codified methodology or criteria for fatigue design exist Recent efforts to revise the foundation design for tendons in API RP2T made abundantly clear the need to establish both procedures and criteria This paper addresses the load and criteria aspects involved in the fatigue damage evaluation of welded piles due to installation and operation, including piles with protruding attachments, such as padeyes for mooring lines or receptacles for tendon bottom terminations A methodology to evaluate local stress histories due to driving is discussed, including pile response to driving, local and residual stresses, and cycle counting A review of practices with respect to safety factors is presented and safety factors consistent with fracture-critical components are suggested INTRODUCTION Driven piles are used to anchor floating structures to the seafloor via a mooring system For floating production, storage, and offloading ships or deep draft caisson vessels, the mooring system consists of a combination of chain and cable lines, whereas for TLPs the system is a tendon made of welded and connected tubular members Typically, each mooring line or tendon is anchored to a single pile The means by which the mooring connects to the anchor pile is also different between lines and tendons, resulting in different loads applied to the pile For the mooring line option, the anchor pile is primarily subjected to bending Tendons, on the other hand, impart tensile axial loads on the pile The distinctive characteristic of anchor piles for mooring lines is that the connection between the pile and the line is via an external padeye Padeyes are needed due to the presence of a chain at the pile end The preferred option is to make the padeye itself by a casting process, insert it in a window cut on the pile wall, and weld it to the pile wall using a two-sided groove weld Alternatively, the padeye can be fabricated from plate and welded directly onto the pile wall Because of the limitations on plate and weld sizes and the amount of welding that may be required, the fabricated padeye tends to be larger and intrinsically more fatigue susceptible than its cast counterpart However, fabricated padeyes can afford more flexibility in fabrication schedule and, thus, offer potential cost savings Anchoring tendons to piles requires more sophisticated mechanical connections, which may include a tendon receptacle at the top of the pile (Fig 1-a) The receptacle often has internally protruding elements, such as shear lugs (Fig 1-b), into which the tendon bottom termination latches The attachments can be sufficiently large to warrant consideration of the effect of their mass inertia on the local stresses in the pile wall as the pile is driven The fatigue life of the pile-mooring connection is dictated by the damage accumulated during installation, as the pile is driven into the seafloor and, during operation, as the mooring maintains station of the floating hull Hence, the fatigue life of the connection may be controlled by either of those two conditions alone, or by a combination of both, depending on the application Therefore, evaluation of the fatigue damage during driving needs to be addressed One design example involving the fatigue damage at a girth weld in a pile anchoring a tendon is given in [Hunt et al] The methodology is based on wave propagation and FE analyses This paper discusses the methodology to arrive at the local fatigue load history during driving when attachments are present besides girth welds Relevant fatigue criteria, including residual stresses and post-weld heat treatment and safety factors are also addressed Although the connection of anchor piles to the mooring units can be significantly different in configuration and principle, the methodology to arrive at the damage inflicted to the piles during driving is the same FATIGUE METHODOLOGY The fatigue methodology includes development of the acting loads due to driving, evaluation of the resistance of the pile to fatigue, and conversion of these loads to local stresses to enter the damage calculation Evaluation of the in-place or Proceedings of The Thirteenth (2003) International Offshore and Polar Engineering Conference Honolulu, Hawaii, USA, May 25–30, 2003 Copyright © 2003 by The International Society of Offshore and Polar Engineers ISBN 1–880653-60–5 (Set); ISSN 1098–6189 (Set)