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Checking

As the feed composition approaches a plait point, the rate of convergence of the calculation procedure is markedly reduced. Typically, 10 to 20 iterations are required, as shown in Cases 2 and 6 for ternary type-I systems. Very near a plait point, convergence can be extremely slow, requiring 50 iterations or more. ELIPS checks for these situations, terminates without a solution, and returns an error flag (ERR=7) to avoid unwarranted computational effort. This is not a significant disadvantage since liquid-liquid separations are not intentionally conducted near plait points. [Pg.127]

Because the precision assigned to the upper and lower extrapolated points is relatively poor, it is possible to obtain a maximum or minimum in the curve, even when fitting all real and extrapolated data from 200 to 600°C. Extrema can occur anywhere, but generally they occur very close to either the lower or the upper end. A check of the sign of the slope at 200°C and 600°C easily indicated the presence of an extremum. When an extremum occurred, a new fit was established to avoid it. [Pg.142]

CHECK FOP MISMATCH BETWEEN URE COMPONENT DATA AND VLE DATA... [Pg.235]

CHECK CONTROL IKEY). IF -I OR 0 CALCULATE TEMPERATURE INDEPENDENT PARAMETERS. [Pg.263]

CHECK FOR SIGNIFICANT CHANGE IN T OR P SINCE LAST CALL FOR SYSTEM... [Pg.300]

CHECK IF EITHER COMPONENT IN BINARY PAIR IS A NONCONOENSABLE... [Pg.313]

FIND NORM OF OBJECTIVE FUNCTION AND CHECK FOR DECREASE 260 FV ABS(F)... [Pg.325]

CHECK FOR VALID FEED COMPOSITIONS AND FOR ESTIMATE OF INCIPIENT PHASE... [Pg.328]

CHECK IF CALCULATION NEAR PLAIT POINT IS PROBABLY IN SINGLE PHASE... [Pg.338]

The reader might wish to check that if the temperature of the phase split is increased or its pressure decreased, the separation between hydrogen, methane, and the other components becomes worse. [Pg.114]

Cortisone is a hormone produced by the cortex of the adrenal glands. As with other adrenal corticoid steroids, administration of cortisone leads to an increased deposition of liver glycogen. Tt can remove features of rheumatoid arthritis, but does not check the underlying disease it is used in various diseases of the eye, and is an antiallergic and anlifibroplastic agent. [Pg.113]

Monitoring is normally adopted as a mechanism to check that any conditions imposed on the project are being enforced or to check the quality of the affected environment. [Pg.73]

Sampling saturated reservoirs with this technique requires special care to attempt to obtain a representative sample, and in any case when the flowing bottom hole pressure is lower than the bubble point, the validity of the sample remains doubtful. Multiple subsurface samples are usually taken by running sample bombs in tandem or performing repeat runs. The samples are checked for consistency by measuring their bubble point pressure at surface temperature. Samples whose bubble point lie within 2% of each other may be sent to the laboratory for PVT analysis. [Pg.113]

The oil and gas samples are taken from the appropriate flowlines of the same separator, whose pressure, temperature and flowrate must be carefully recorded to allow the recombination ratios to be calculated. In addition the pressure and temperature of the stock tank must be recorded to be able to later calculate the shrinkage of oil from the point at which it is sampled and the stock tank. The oil and gas samples are sent separately to the laboratory where they are recombined before PVT analysis is performed. A quality check on the sampling technique is that the bubble point of the recombined sample at the temperature of the separator from which the samples were taken should be equal to the separator pressure. [Pg.113]

The fluid properties of formation water may be looked up on correlation charts, as may most of the properties of oil and gas so far discussed. Many of these correlations are also available as computer programmes. It is always worth checking the range of applicability of the correlations, which are often based on empirical measurements and are grouped into fluid types (e.g. California light gases). [Pg.116]

The PIF estimate is only a qualitative check on the potential benefit of a horizontal well. There is actually a diminishing return of production rate on the length of well drilled, due to increasing friction pressure drops with increasing well length, shown schematically in Figure 9.6. [Pg.219]

It Is important to know how much each well produces or injects in order to identify productivity or injectivity changes in the wells, the cause of which may then be investigated. Also, for reservoir management purposes (Section 14.0) it is necessary to understand the distribution of volumes of fluids produced from and injected into the field. This data is input to the reservoir simulation model, and is used to check whether the actual performance agrees with the prediction, and to update the historical data in the model. Where actual and predicted results do not agree, an explanation is sought, and may lead to an adjustment of the model (e.g. re-defining pressure boundaries, or volumes of fluid in place). [Pg.221]


See other pages where Checking is mentioned: [Pg.246]    [Pg.255]    [Pg.267]    [Pg.302]    [Pg.312]    [Pg.312]    [Pg.313]    [Pg.322]    [Pg.322]    [Pg.322]    [Pg.323]    [Pg.325]    [Pg.328]    [Pg.328]    [Pg.329]    [Pg.329]    [Pg.331]    [Pg.332]    [Pg.332]    [Pg.332]    [Pg.338]    [Pg.339]    [Pg.339]    [Pg.339]    [Pg.339]    [Pg.343]    [Pg.343]    [Pg.343]    [Pg.260]    [Pg.443]    [Pg.54]    [Pg.73]    [Pg.139]   
See also in sourсe #XX -- [ Pg.15 , Pg.88 , Pg.93 , Pg.95 , Pg.179 , Pg.192 , Pg.282 ]




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