Mobil

About: Mobil is a based out in . It is known for research contribution in the topics: Catalysis & Zeolite. The organization has 7085 authors who have published 10642 publications receiving 237497 citations. The organization is also known as: Socony-Vacuum Oil Company & Standard Oil Company of New York.

Stress magnitudes from logs: Effects of tectonic strains and temperature

Abstract: An improved method of calibrating in-situ stress logs has been validated with data from two wells. Horizontal stress profiles are useful for hydraulic fracture design, wellbore stability analysis, and sand production prediction. The industry-standard method of estimating stresses from logs is based on overburden Poisson's ratio, and pore pressure effects and outputs an estimate of minimum horizontal stress. The model proposed here adds effects of temperature and tectonics and outputs minimum and maximum horizontal stress magnitudes, which are particularly important to the successful completion of horizontal and deviated wells. This method was validated using data collected from a GRI research well and a Mobil well. Seven microfrac stress tests in GRI's Canyon Gas Sands well of Sutton County, TX, provided a means of comparing the predictive capability of different methods. First, one of the seven stress tests was selected as a calibration standard for the stress log. Then the results obtained from the two calibration methods were compared to stress magnitudes from the other six stress tests. This process was repeated using each of the seven stress tests as a calibration standard and comparing predictions to the other six. In every case, the method incorporating tectonic and temperature effects produced significantly more accurate values. In the Mobil well, pre-frac treatment breakdown tests were used to calibrate a log-derived stress profile. While reservoir pressure dominated stress variations, a significant deviation of the log value from the stress-test value in one layer was corrected when the method with tectonics and temperature was used.

Bimodal molecular weight distribution polyolefins

Abstract: Resins which are in situ catalytically produced blends of broad bimodal molecular weight distribution ethylene resin are produced. The resins of the invention are characterized by a blend of low molecular weight component and high molecular weight component with HMW component weight fraction which is greater than 0 (zero). Generally, the LMW/HMW weight fraction can be controlled within a very broad range. The resin has a molecular weight distribution, which is characterized as MFR or Mw/Mn. The bimodal molecular weight resins can be processed into films on existing equipment, and exhibit good processability in blown film production and provide film product of excellent FQR. The resin of the invention exhibits reduced tendency towards die-lip buildup and smoking in on-line operations.

The Trollheim alluvial fan and facies model revisited

Abstract: Widely held, fundamental alluvial-fan facies concepts generated in past literature based on the Trollheim fan, Deep Springs Valley, California, are inconsistent with the actual characteristics of this fan Previous publications have established, mostly without field study, that the Trollheim fan consists of debris-flow, sieve lobe, sheetflood, and channel facies; debris-flow and sieve deposits comprise the proximal area, giving way to channel or sheetflood deposits distally Contrary to these views, clayey and gravelly, matrix-supported, debris-flow deposits dominate all parts of the Trollheim exposures, suggesting that this fan has been built almost exclusively by mass-wasting events Channel-fill deposits constitute only a small component of the fan, and most are restricted to the proximal area where they have an inset relationship with debris-flow sequences The channel facies consists of laterally restricted, clast-supported gravel lenses formed primarily through the winnowing of debris-flow fines by streamflow The most widespread facies on the surface of the fan is a mantle of varnished, matrix-free pebbles, cobbles, and boulders that commonly are distributed in radially oriented lobes or levees characteristic of debris-flow deposits This mantle was produced by the surficial winnowing of the fine-fraction from debris-flow deposits primarily by overland water flow In contrast to previous conclusions, sheetflood and sieve deposits were not identified anywhere on the fan Additionally, many of the facies depicted in the widely cited "Trollheim vertical profile," including ripple-bedded sand, cross-bedded sand, and overbank mud, are not present on, or in stratigraphic cuts of, the fan after which the profile was named

Molecular weight distributions of linear polymers: Detailed analysis from GPC data

Abstract: The GPC method is used widely to measure molecular weights of linear polymers. High-quality GPC data contains detailed information on many aspects of the polymer's molecular weight distribution (MWD). This information can be extracted from the data using computer analysis. Equations have been derived for the two simplest MWD functions in the GPC coordinates: the Flory function (one growing polymer chain produces one polymer molecule), and for the case when two polymer radicals combine into one polymer molecule. The equations were used to analyze MWD of two classes of polymers. The first class includes polymers with narrow MWD: polyethylene, ethylene-propylene and ethylene-hexene copolymers, syndiotactic polystyrene, and radical polystyrene. The second class includes polymers with broad MWD: ethylene copolymers and polypropylene produced with heterogeneous, Ti-based catalysts. The examples demonstrate that the resolution of complex GPC curves into their constitutents serve as an important source of information about kinetics of polymerization reactions. © 1995 John Wiley & Sons, Inc.