the bottom trawl selectivity parameters (22mm cod-end mesh size) were determined for saurida undosquamis , mullus barbatus , upeneus pori , and pagellus erythrinus along karatas coasts of turkey in northeastern mediterranean waters during fishing season for the year 2002-2003. the lengths at first capture (l 50 ) values for s. undosquamis , m. barbatus , u. pori and p. erythrinus were 12.57, 9....

Abstract As a production method of low wells and remote oil wells, bailing recovery is particularly important for its reasonable working system. The dimensionless bottom hole flowing pressure solved by establishing the seepage mechanics equation infinite homogeneous formation, productivity bailed well predicted using direct relationship between unit flow rate. On this basis, mathematical model ...

Testing should never become a mindless exercise in which operations personnel blindly follow proceMany papers have been published extending the dures written by others. The people who are theoretical understanding of pressure transient implementing the test should be actively trying to analysis. Most of these papers have concentrated on achieve the test objectives. It is often difficult or anal...

[1] Ocean bottom pressure estimates from Gravity Recovery and Climate Experiment (GRACE) have been validated by comparisons with an array of in situ bottom pressure measurements. The 600 km by 600 km array comprised 46 bottom pressure sensors that were part of the Kuroshio Extension System Study (KESS). Validations in other ocean regions have been limited by available data to pointwise bottom p...

Well testing is a crucial stage in the decision of setting up new wells on oil field. Decision makers rely on the metrics to evaluate the candidate wells’ potential. One important metric is permeability, measuring the ability of porous material to transmit fluids. High permeability often leads to high yielding. In a conventional well test, the well is controlled to produce at a constant flow ra...

The high temperatures existing within a geothermal well preclude the use of most logging instrumentation which is necessary to study the wellbore and surrounding rock matrix. Possible solutions to this problem include cooling the wellbore and the surrounding rock by circulating fluid in the wellbore and by injecting fluid directly into the rock matrix. The latter method, however, is not preferr...

It was known that a mesh screen placed across an airflow will have an evening effect, distributing both the velocity and pressure across the screen, however this effect had not been quantified and the effect of different mesh geometries was unknown. It was desired to understand the relationship between airflow velocity, the pressure behind the screen and the free hole area of the screen. It was...

The hole stress concentration effects on the tensile strength of SMC-R50 sheet moulding compound composites were studied with consideration being given to both centric and eccentric hole locations. It is shown that the tensile strength of the R50 material is improved by applying a transverse normal pressure around the hole boundary. A few preliminary experiments indicate that the fatigue life o...