Abu Dhabi's onshore oil fields are generally mature and contain carbonate reservoirs with light oil and gas. Various well types have been employed, such as vertical, highly deviated, and horizontal wells with cased hole or openhole completions. Surveillance of wellbore and formation fluid attributes is essential for reservoir management decisions and hydrocarbon production enhancement. This paper discusses surveillance techniques to understand multi-phase flow characteristics and reservoir saturation. Formation saturation monitoring and production profiling have been performed actively using pulsed neutron logging (PNL) and array production logging (APL) techniques. Challenges in employing the APL method in Abu Dhabi onshore fields include (1) many wells are horizontal with barefoot completions, (2) horizontal sections extend typically more than 2000-ft long with irregular and undulating trajectories, and (3) wells contain asphaltene, debris, and other materials preventing optimal spinner flowmeter functionality. After reviewing each well condition, well environment-specific combinations of APL, nuclear production logging applications for holdups and water velocity calculations, and an advanced three-phase formation saturation analysis technique were determined. This approach overcame several challenges to deliver surveillance objectives. We demonstrate four case examples, delineating well-based production and formation saturation profiles in various conditions. Two nuclear measurements exhibiting different sensitivities to oil and gas were combined to compute three-phase formation saturation. When a horizontal openhole wellbore was severely under-gauged, the pulsed neutron-based holdup application was used to avoid an APL tool deployment that might result in tool damage and unsatisfactory data acquisition. Additionally, for wells with good wellbore conditions, pulsed neutron-based and APL-based holdup data sets were acquired, and analysis results were compared. A stationary water velocity calculation method when water cut was high was also adopted to identify downhole water sources, and in-situ water production profiles from APL and nuclear applications were compared. An effort to evaluate production profile and in-situ saturation effectively from highly deviated- and horizontal wellbores to improve hydrocarbon production is described. The delineation of production profiles and formation fluid distribution allowed operators to determine reservoir and production management strategies.

بلغ الظلم الذي وقع على فلسطين مبلغاً، إذ وضعها اليهود في مخيلتهم ودبروا الأكاذيب ولفقوا القصص للاستحواذ على أرضها وخيراتها واستيطانها بذرائع عديدة ومساعدة الدول الكبرى والعظمى منها، لذلك حيكت ضدها عدد من الدسائس بدأت باتفاقية سايكس-بيكو عام 1916، وأعقبها وعد بلفور المشؤوم عام 1917 ليعطي الضوء الأخضر لليهود للانتقال إلى فلسطين وتكوين العصابات التي بدأت بتهجير السكان العزل وبدأت النيات اليهودية بالتوسع لإقامة دولة على الأراضي الفلسطينية المغتصبة فقام العرب بدور كبير في الدفاع عن الأراضي العربية وفي نهاية الأربعينيات, ولتنفيذ وضع المخطط الصهيوني في إقامة وطن قومي يهودي فوق الأراضي العربية في فلسطين, واستعداد وتعبئة وتدريب وتنظيم حتى بدأت الحرب عام 1948 لتنهي تلك الفصول وتحتل (إسرائيل) الأراضي الفلسطينية. وان التعاون العسكري كان أول مظهر له في فلسطين عند تأليف جيش الإنقاذ وكان بقيادة كبار الضباط العراقيين وبقية الضباط من العرب ودخول الجيوش العربية في حرب فلسطين عام 1948.

Carbon-Oxygen ratio measurements are advantageous for calculation of water saturation behind casing in situations where the normal pulsed neutron sigma log fails to do so. Examples include reservoirs stimulated by acids or those having fresh water. Carbon steel casing commonly used to inhibit corrosion processes. In most cases, the carbon content in the steel material is an unknown parameter that can contaminate the accuracy of the C/O measurement. Another challenge, particularly in Abu Dhabi National Oil Company (ADNOC) reservoirs, is the high salinity of the formation water (typically 200 Kppm NaCl) where Chlorine makes more gamma rays per neutron compared to other elements and can interfere with the oxygen accuracy. In this paper, we propose methods and workflows to assure the accuracy of oil saturation from C/O measurements. To lower the dependence on carbon, examples of a process that uses the ratio of the Oxygen window to the total inelastic gamma counts are demonstrated. The responses of other inelastic data including the total inelastic count rate and the ratio of inelastic to capture can be scaled as water saturation as a secondary quality control method. Examples of C/O processing with chlorine corrections are also demonstrated. Data from two wells with consistent reservoir parameters (porosity, rock, wellbore, etc.) are used to demonstrate the proposed techniques. This data is augmented with computer models and analysis to understand the various steps in the workflow. The proposed technique has been applied with acceptable saturation results behind carbon steel in acid stimulated reservoirs, with high salinity water. This paper provides a solution to estimate water saturation behind carbon steel casings in acid stimulated reservoirs and with high salinity water. We have developed workflows as best practices to assure the accuracy of Carbon/Oxygen oil saturation measurements.