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24 Dec 2008 08:28:33 GMT

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INVESTIGATION OF WETTABILITY EFFECTS ON CAPILLARY PRESSURE, AND IRREDUCIBLE SATURATION FOR SAUDI CRUDE OILS, USING ROCK CENTRIFUGE

23 Dec 2008 08:16:12 GMT

The main task of a petroleum reservoir engineer is to produce oil and gas reservoirs with maximum economic rate and reaching the ultimate recovery. Reservoir evaluation processes need a reservoir description as completely and accurately as possible using a variety of methods from seismic and well testing to logging, cuttings analysis and coring. These methods present the engineer with a valuable and wide range of scales of information to well evaluate the reservoir and control its performance and improve oil recovery. The main goal of core analysis is to reduce uncertainty in reservoir evaluation processes created by the uncertainty degree in the input parameters at the different levels from reserve estimate level to the enhancement of reservoir performance level. In order to reach these targets, the exact determination of certain petrophysical properties are necessary such as rock porosity, relative permeability, water saturation, and capillary pressure at all stages of reservoir life and rock wettability. Predicting reservoir wettability and its effect on fluid distribution and hydrocarbon recovery remains one of the major challenges in reservoir evaluation and engineering. Current laboratory based techniques require the use of rock-fluid systems that are representative of in situ reservoir wettability. Several parameters like relative permeability's, residual saturations, and capillary depressurization curves change with the wettability state of the reservoir. In addition all these parameters, can greatly impact oil recovery. Thus, there is a need to relate all these parameter to wettability state of the reservoir.
In this study, irreducible oil saturation and capillary pressures using rock centrifuge measurements for Berea Sandstone rock samples and Saudi oils will be tested during drainage and imbibitions cycles by varying each time the wettability of the tested samples by using different Saudi oils (Heavy, Medium, and Light). The capillary pressure for the aged samples will be measured again by the rock centrifuge. Hence, the changes in capillary pressure curve before and after wettability alteration will be obtained. Hence, wettability, capillary pressure, initial fluids saturation, will be correlated for Saudi reservoirs.

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11 Dec 2008 13:15:12 GMT

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SPACE AXIS SYMMETRIC STABILITY OF VERTICAL WELL IN MASSIF WITH LAYER OF ROCK LOWERED PHYSICO-MECHANICAL CHARACTERISTICS

05 Dec 2008 14:02:12 GMT

Space axis symmetric stability of elastico-plastic equilibrium of vertical well in massif with layer of rock lowered physico-mechanical characteristics has been researched in this work. The Coulomb-Mohr condition as a durability criterion is used in this research. Statements of Stability Theory in Rock Mechanics elaborated by prof. M.T.Alimzhanov are used in this research. The next "stability parameters" of vertical well has been defined: critical radius of zone of inelastic deformations, critical density of drilling mud and critical displacement of a well contour.

USING NANOPARTICLES TO DECREASE DIFFERENTIAL PIPE STICKING AND ITS FEASIBILITY IN IRANIAN OIL FIELDS

27 Nov 2008 10:03:23 GMT

This paper presents new method to prevent stuck pipe or at least to decrease its probability while drilling of oil and gas wells. This method which is applicable in both vertical and deviated wells incorporates using nanoparticles in drilling mud composition to decrease mud cake thickness. So by having less mud cake thickness, probability of stuck pipe decreases. Also different mechanisms of stuck pipe in Ahwaz and Abb-Taymoor oil fields are considered and new approach is suggested to use, while drilling of most sensitive formations respect to stuck pipe in these oil fields.

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19 Nov 2008 09:46:22 GMT

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OPTIMIZING WELLBORE INCLINATION AND AZIMUTH TO MINIMIZE INSTABILITY PROBLEMS

13 Nov 2008 05:53:17 GMT

Wellbore stability is of critical importance in the success of drilling operations. One of the main goals of any drilling mission is to drill the well as cost-effective as possible. Wellbore instability can be detrimental to this goal. Therefore, wellbore stability analysis has been included in well planning stage of many companies.
Wellbore stability is a function of several factors such as inclination and azimuth, in-situ stresses, mud weight, rock strength parameters, etc. Some of these factors are controllable and some are not. Among the controllable factors are inclination, azimuth and mud weight. By changing these parameters, one can reduce stability problems significantly. Theoretically, it is possible to design the well trajectory in a way to face least stability problems.
In this paper linear elastic constitutive model along with Mohr-Coulomb failure criterion have been utilized to perform stability calculation for different inclinations and azimuths. It is shown that drilling wells parallel to minimum in-situ horizontal stress causes less stability problems. Also the effect of in-situ stress field on wellbore stability has been investigated and it has been demonstrated that in the case of high difference between the in-situ stresses, the optimum path for a well is a low inclination and an intermediate azimuth.

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07 Nov 2008 10:42:17 GMT

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29 Oct 2008 06:06:13 GMT

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THE EVALUATION OF POSSIBILITIES OF AUXILIARY WELLBORES TESTING USING TEMPERATURE CHANGES IN THE WELL

29 Oct 2008 06:06:11 GMT

In this paper the question of utilizing borehole temperature measurements potentialities to determine inflow intervals of the auxiliary wellbores without getting into auxiliary wellbore is studied using mathematical calculation. Convection heat transfer in auxiliary wellbore and thermodynamic effects (barothermal and throttling or Joule - Thomson effect) in formation are taken into account.

THERMOMAGNETIC MARKERS IN STUDIES OF THE RESERVOIR ROCKS

24 Oct 2008 10:31:24 GMT

Thermomagnetic curves of reservoir rocks have been studied as markers of substance and reservoir rocks formation. In the temperature range of 400-530C it is observed an increase in the magnetization (maximum it is reached about 500C), then it goes the decrease in the magnetization of the newly formed magnetite, and it is sometimes visible the decrease in the magnetization of hematite (650-680C). The curves of the second heating differ more considerably, which depends on the content of Fe, sulfur, organic matter in samples. A series of the peaks are observed in the temperature range from 250 to 400C. These peaks are caused by magnetostatistical interaction of the generated pyrrhotine and magnetite. Since these minerals are formed into some aggregates, we observed temperature of Curie of pyrrhotine by the peak of the relative increase in the magnetization, caused by the transformation of magnetic and nonmagnetic sulfides into the magnetite (between 400C and 500C). This behavior is characteristic for the samples, which contain pyrite. Roughly, a quantity of pyrite can be evaluated on the decrease in the magnetization to ~400C. The presence of ferrous minerals, especially pyrite, not only decreases capacitive properties, but also it is the mineralogical factor, which influences the safety of the meta-stable phases of clay minerals.

CLOSING COMMUNICATION GAPS CAN IMPROVE THE SUCCESS OF OIL & GAS VENTURES

06 Oct 2008 09:36:10 GMT

For nearly a century, National Oil Companies (NOCs) and International Oil Companies (IOCs) have jointly executed the challenging task to match the global energy supply and demand schedules. Increasingly, IOCs struggle for access to reserves, controlled by NOCs, as follows from an inventory of the regional spread of reserves. The global increase in energy demand and unequal access to reserves has an important consequence: negotiations and relation management involve mutual stakes higher than ever before. This situation implicates that even the smallest flaw in effective communication between stakeholders (professionals, companies and governments) may result in an adverse impact on the outcome of the business cooperation - causing loss of business value. Communication between people in the international Oil & Gas business involves professionals that are naturally endowed with not only a range of human emotions but they also come from a diversity of cultures. The impact of cultural diversity on business efficiency is certainly not new to the Oil amp; Gas business, but still intensifies due to globalization. Nonetheless, the interaction between social groups and proper management of human emotions is often neglected in an industry already dominated by formidable technical challenges that require stout determination to overcome.

We highlight the need to build intercultural bridges and necessity of dedicated training in the area of Emotional Intelligence. The model of Cornelis 'Feeling's Logic' is adopted and adapted to codify risks related to culture, personal skills, and self-actualization. The model is applied to Gas Trade relationship between Europe and Russia.

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