Reservoir Fluid Geodynamics for Characterization of Reservoir Connectivity: Case Study from Western Kazakhstan (Russian)

In Western Kazakhstan, post-salt high porosity clastic reservoirs of the Caspian Basin of Jurassic and Triassic age are represented by multilayer and multi-contact deposits having several gas-oil (GOC) and oil-water contacts (OWC), formed by channel deposits. Reservoirs have good formation properties. Application of advanced logging suite allows to delineate all the key reservoir properties, such as effective oil-saturated thicknesses, all the types of contacts (GOC, GWC, OWC) along with some other properties. However, in such type of reservoirs, it is important to determine a connectivity of individual lobes/lenses – different small parts of deposits. This can only be achieved via well testing and fluid sampling. Traditional well testing has long been a must during the exploration stage to obtain vital information on reservoir dynamic properties. Usually, it is rather a tedious and time-consuming process, especially when there are many uncertainties on reservoir fluid saturations that can lead to increased well construction costs. This paper will discuss an example on how to optimize and accelerate well testing stage using advanced wireline formation tester and extended logging methods in an open hole, which, in turn, allows for faster commissioning of reservoirs into production. It is important to note that wireline formation testers cannot fully replace traditional well testing of wells and reservoirs; however, they significantly expand and improve the capabilities traditional well testing has to offer. Therefore, the most optimal solution proposed by Embamunaigas was the joint use of results of wireline formation tester and traditional well test data in green fields. This workflow has successfully been tested in its license areas in recent years.

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Optimization of Well Testing for Current Reserves Estimation with Modern Wireline Formation Testers and Open Hole Logs in Exploration Wells Drilled in High Porosity Sandstone Suprasalt Sediments Field

Blinov

Filimonov

Ramatullaev

et al. 2020

Day 2 Thu, October 22, 2020

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Optimization of Well Testing for Current Reserves Estimation with Modern Wireline Formation Testers and Open Hole Logs in Exploration Wells Drilled in High Porosity Sandstone Suprasalt Sediments Field (Russian)

Blinov

Filimonov

Ramatullaev

et al. 2020

SPE Annual Caspian Technical Conference

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Cost-Effective Evaluation of Geological Reserves using Optimal Logging Suite in Exploration Well Drilled through Multilayer Hydrocarbon-Bearing Clastic Formations in West Kazakhstan

Tasemenov,

Saparova,

Blinov

et al. 2023

Day 1 Tue, November 21, 2023

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Modern advanced logging suite and wireline formation tester (WFT) were used for prompt and cost-effective hydrocarbon reserves evaluation for well, drilled through multi-layer clastic formations on unexplored block of the oilfield in West Kazakhstan. Based on acquired comprehensive open-hole wireline logging data and data interpretation results, cased-hole well testing program was severely minimized. Described in this work appraisal well was drilled thru 16 hydrocarbon-bearing clastic formations of Jurassic and Triassic age deposits. Employed logging suite included quad-combo and nuclear magnetic resonance (NMR) tool for accurate evaluation of required petrophysical properties. Quick-look log data interpretation allowed to derive formations properties and their saturation profiles, preliminary delineate several fluid contact levels, as well as prepare optimized formation testing program. WFT was used to measure formation pressure and fluid mobility, as well as to confirm or clarify formation saturation and fluid contacts, capture representative samples of reservoir oil and gas. Current case study demonstrates cost-effective approach of obtaining all the required information for quick estimation of hydrocarbons geological reserves for multi-layer clastic formations. Although large number of reservoirs were confidently characterized, described in this work single well formations evaluation, and testing in open hole took less than two weeks. After setting casing, five out of sixteen productive intervals were perforated and tested, whereafter well was turned into production. Since conventional cased hole testing was performed only for reservoirs, which were required prove of commercial flow, entire well reservoirs testing program was drastically reduced. Described study demonstrates modern and cost-effective way of comprehensive evaluation of hydrocarbon deposits for multi-layer clastic formations of fluvial origin.

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Reservoir Fluid Geodynamics for Characterization of Reservoir Connectivity: Case Study from Western Kazakhstan (Russian)

Cited by 3 publications

References 6 publications

Optimization of Well Testing for Current Reserves Estimation with Modern Wireline Formation Testers and Open Hole Logs in Exploration Wells Drilled in High Porosity Sandstone Suprasalt Sediments Field

Optimization of Well Testing for Current Reserves Estimation with Modern Wireline Formation Testers and Open Hole Logs in Exploration Wells Drilled in High Porosity Sandstone Suprasalt Sediments Field

Optimization of Well Testing for Current Reserves Estimation with Modern Wireline Formation Testers and Open Hole Logs in Exploration Wells Drilled in High Porosity Sandstone Suprasalt Sediments Field (Russian)

Cost-Effective Evaluation of Geological Reserves using Optimal Logging Suite in Exploration Well Drilled through Multilayer Hydrocarbon-Bearing Clastic Formations in West Kazakhstan

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