Exploration and Formation Testing of Low Permeability Clastic Reservoir in Hot Slim-Diameter Open-Hole Well

2021 ◽  
Author(s):  
Vladislav Blinov ◽  
Elena Koshevaya ◽  
Samat Ramatullayev ◽  
Anton Filimonov ◽  
Kirill Shteynbrenner ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Well Logging ◽  
High Tech ◽  
Low Permeability ◽  
Extreme Conditions ◽  
Well Test ◽  
Fluid Analysis ◽  
Short Period ◽  
Open Hole ◽  
Exploration Well

Abstract The objective of the logging campaign was to explore the hydrocarbon deposits in low-permeability clastic reservoirs utilizing an advanced logging suite and a high-tech wireline formation tester (WFT). The exploration well, which had a diameter of 146 mm and was drilled to a vertical depth of 4750 m, had a temperature of 147 degrees Celsius downhole. Despite the challenging geological and downhole conditions: low permeability reservoir, high reservoir temperature, small wellbore diameter, and very high salinity drilling mud, the advanced logging suite data, which included nuclear magnetic resonance (NMR) and cross-dipole broadband acoustic logging, was successfully acquired. The WFT, which consists of a unique radial probe technology for efficient sampling of extremely low-permeability formations and a downhole fluid analyzer to determine the nature of the inflow and make rapid operational decisions in real time, was then used to perform downhole fluid analysis and sampling stations. Oil and gas-saturated reservoir intervals were identified, their porosity, water saturation, and permeability were evaluated, and an optimal open hole WFT program was produced as a result of the extended logging suite's interpretation. Special technological operations were performed during well logging in this well, allowing for the acquisition of high-quality NMR data under extreme conditions. Rapid processing and interpretation of well logging data, performed without any a priori reservoir data, allowing for the identification of the best permeability intervals in oil and gas-saturated reservoirs and the design of an optimal WFT program in an open hole. Downhole fluid analysis and sampling stations were performed with WFT with pressure build-up to determine fluid mobility to validate the presence of productive intervals. Thus, in several downhole trips in a relatively short period of time, potential hydrocarbon layers were assessed in an open hole section, and in the presence of sufficient fluid mobility, the saturation of the interval was determined by WFT. It is important to note that downhole gas samples were acquired in intervals having fluid mobility less than 0.06 mD/cP, where the conventional well test would most probably fail to induce a flow without stimulation. An integrated approach using modern well logging methods made it possible to solve the set geological challenges in the extreme conditions in this exploration well, where traditional methods would introduce significant uncertainties.

Expanding the Capabilities of Modern Wireline Formation Testers for Understanding the Structure of Tight and Fractured Suprasalt Carbonate Field in West Kazakhstan

2021 ◽  
Author(s):  
Vladislav Blinov ◽  
JIN Shutang ◽  
Samat Ramatullayev ◽  
Anton Filimonov ◽  
Muratbek Zhabagenov ◽  
...  
Keyword(s):  
Pore Space ◽  
Complex Structure ◽  
Well Logging ◽  
High Tech ◽  
Unique Approach ◽  
Complex Fluid ◽  
West Kazakhstan ◽  
New Perspective ◽  
Exploration Well ◽  
Fluid Inflow

Abstract Low porosity carbonate reservoirs of the Carboniferous and Devonian periods of the Caspian Basin in Western Kazakhstan are challenging to characterize using traditional well logging methods due to the complex structure of the pore space, which necessitates lengthy and sometimes ineffective production well tests. Limitations of standard well logging methods make it impossible to reliably identify productive reservoirs, determine boundary conditions, and delineate saturation. As a result, a unique approach is required, which includes the integration of special "high-tech" logging tools and wireline formation testers (WFT). This paper effectively demonstrates the use of this approach in an appraisal exploration well. The use of a wireline formation tester in conjunction with modern complex fluid analyzers and a radial probe allowed for testing several carbonate intervals with extremely low-permeability in one trip, which previously required stimulation to trigger fluid inflow in a cased well. This provided a new perspective on understanding the reservoir structure in the shortest amount of time possible.

scholarly journals Determination of Safe Mud Weight Window in Rumaila Oilfield, Southern Iraq

2021 ◽  
Vol 54 (2F) ◽  
pp. 48-61
Author(s):  
Walaa Khyrie ◽  
Ayad Alrazzaq
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Failure Criteria ◽  
Well Test ◽  
Geomechanical Model ◽  
Gas Industry ◽  
Wellbore Instability ◽  
North West ◽  
Well Design ◽  
Open Hole

The oil and gas industry, wellbore instability plays an important role in financial losses and stops the operations while the drilling which leads to extra time known as non-productive time. In this work, a comprehensive study was carried out to realize the nature of the instability problems of the wellbore in Rumaila oilfield to improve the well design. The study goal is to develop a geomechanical model in one dimension by utilizing Schlumberger Techlog (Version 2015) software. Open hole wireline measurements were needed to develop the model. The model calibrating and validating with core laboratory tests (triaxial test), well test (Mini-frac test), repeated formation test. Mohr-Coulomb, Mogi-Coulomb, and Modified Lade are the three failure criteria which utilized to analyze the borehole breakouts and to determine the minimum mud weight needed for a stable wellbore wall. For more accuracy of the geomechanical model, the predicted profile of the borehole instability is compared with the actual failure of the borehole that is recorded by caliper log. The results of the analysis showed that the Mogi-Coulomb criteria are closer to the true well failure compared with the other two criteria and considered as the better criteria in predicting the rock failure in the Rumaila oilfield. The wellbore instability analysis revealed that the vertical and low deviated wells (less than 40º) is safer and more stable. While, the horizontal and directional wells should be drilled longitudinally to the direction of the minimum horizontal stresses at a range between 140º–150º North West-South East and the mud weight recommended is increased to 10.5 ppg to avoid most of instabilities problems. The results contribute in development plan of the wells nearby the studied area and decreasing NPT and cost.

ASSESSMENT OF OIL WELL PRODUCTIVITY IN LOW-PERMEABILITY RESERVOIRS IN THE FIELDS OF EASTERN SIBERIA

2017 ◽  
pp. 30-36
Author(s):  
R. V. Urvantsev ◽  
S. E. Cheban
Keyword(s):  
Oil Recovery ◽  
Large Scale ◽  
Oil And Gas ◽  
Oil Extraction ◽  
Low Permeability ◽  
Oil Well ◽  
Eastern Siberia ◽  
Development Costs ◽  
Traditional Fields ◽  
Low Permeability Reservoirs

The 21st century witnessed the development of the oil extraction industry in Russia due to the intensifica- tion of its production at the existing traditional fields of Western Siberia, the Volga region and other oil-extracting regions, and due discovering new oil and gas provinces. At that time the path to the development of fields in Eastern Siberia was already paved. The large-scale discoveries of a number of fields made here in the 70s-80s of the 20th century are only being developed now. The process of development itself is rather slow in view of a number of reasons. Create a problem of high cost value of oil extraction in the region. One of the major tasks is obtaining the maximum oil recovery factor while reducing the development costs. The carbonate layer lying within the Katangsky suite is low-permeability, and its inventories are categorised as hard to recover. Now, the object is at a stage of trial development,which foregrounds researches on selecting the effective methods of oil extraction.

scholarly journals Impact of Diagenesis on the Low Permeability Sandstone Reservoir: Case Study of the Lower Jurassic Reservoir in the Niudong Area, Northern Margin of Qaidam Basin

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 453
Author(s):  
Wenhuan Li ◽  
Tailiang Fan ◽  
Zhiqian Gao ◽  
Zhixiong Wu ◽  
Ya’nan Li ◽  
...  
Keyword(s):  
Physical Properties ◽  
Oil And Gas ◽  
Qaidam Basin ◽  
Isotope Analysis ◽  
Lower Jurassic ◽  
Low Permeability ◽  
Hydrocarbon Generation ◽  
Northern Margin ◽  
Pore Evolution ◽  
Sandstone Reservoir

The Lower Jurassic reservoir in the Niudong area of the northern margin of Qaidam Basin is a typical low permeability sandstone reservoir and an important target for oil and gas exploration in the northern margin of the Qaidam Basin. In this paper, casting thin section analysis, scanning electron microscopy, X-ray diffraction, and stable isotope analysis among other methods were used to identify the diagenetic characteristics and evolution as well as the main factors influencing reservoir quality in the study area. The predominant types of sandstone in the study area are mainly feldspathic lithic sandstone and lithic arkose, followed by feldspathic sandstone and lithic sandstone. Reservoir porosity ranges from 0.01% to 19.5% (average of 9.9%), and permeability ranges from 0.01 to 32.4 mD (average of 3.8 mD). The reservoir exhibits robust heterogeneity and its quality is mainly influenced by diagenesis. The Lower Jurassic reservoir in the study area has undergone complex diagenesis and reached the middle diagenesis stage (A–B). The quantitative analysis of pore evolution showed that the porosity loss rate caused by compaction and cementation was 69.0% and 25.7% on average, and the porosity increase via dissolution was 4.8% on average. Compaction was the main cause of the reduction in the physical property of the reservoir in the study area, while cementation and dissolution were the main causes of reservoir heterogeneity. Cementation can reduce reservoir space by filling primary intergranular pores and secondary dissolved pores via cementation such as a calcite and illite/smectite mixed layer, whereas high cement content increased the compaction resistance of particles to preserve certain primary pores. δ13C and δ18O isotopes showed that the carbonate cement in the study area was the product of hydrocarbon generation by organic matter. The study area has conditions that are conductive to strong dissolution and mainly occur in feldspar dissolution, which produces a large number of secondary pores. It is important to improve the physical properties of the reservoir. Structurally, the Niudong area is a large nose uplift structure with developed fractures, which can be used as an effective oil and gas reservoir space and migration channel. In addition, the existence of fractures provides favorable conditions for the uninterrupted entry of acid fluid into the reservoir, promoting the occurrence of dissolution, and ultimately improves the physical properties of reservoirs, which is mainly manifested in improving the reservoir permeability.

The Current Situation and Prospects of Development of Low Permeability Oil Reservoir

2013 ◽  
Vol 734-737 ◽  
pp. 1286-1289 ◽  
Author(s):  
Lin Cong ◽  
Wen Long Li ◽  
Jing Chao Lei ◽  
Ru Bin Li
Keyword(s):  
Research Methods ◽  
Oil And Gas ◽  
Low Permeability ◽  
Oil Reservoir ◽  
Oil Exploration ◽  
Gas Field ◽  
Oil And Gas Field ◽  
Low Permeability Reservoirs ◽  
Technical Measures ◽  
Exploration And Development

Internationally the research of low permeability oil reservoir is a difficult point in the exploration and development of oil and gas field. This thesis, based on the research methods of low permeability reservoirs at home and abroad, summaries several major problems encountered in the process of low permeability oil exploration and development under the current technical conditions as well as the corresponding, but more effective technical measures that need to be constantly improved. And that exploration and development of low permeability of the reservoir will be the main battle field for some time in the future of oil exploration and development.

Well Logging Data Interpretation in Oil and Gas Source Rock Sections Based on Complex Petrophysical and Geochemical Analysis Results

2018 ◽  
Author(s):  
Rais Khisamov ◽  
Natalya Skibitskaya ◽  
Kazimir Kovalenko ◽  
Venera Bazarevskaya ◽  
Nikita Samokhvalov ◽  
...  
Keyword(s):  
Source Rock ◽  
Oil And Gas ◽  
Data Interpretation ◽  
Well Logging ◽  
Geochemical Analysis ◽  
Gas Source

scholarly journals Overview of the III International Conference on Applied Physics, Information Technologies and Engineering – APITECH-III 2021

2021 ◽  
Vol 2094 (1) ◽  
pp. 011001
Author(s):  
Igor V Kovalev ◽  
Anna A Voroshilova ◽  
Nikolay A Testoyedov
Keyword(s):  
Information Technology ◽  
Information Technologies ◽  
Oil And Gas ◽  
High Tech ◽  
Nonequilibrium Systems ◽  
Applied Physics ◽  
International Conference ◽  
Modern Methods

The overview describes the main directions and results of the III International Conference APITECH-III 2021 held in Krasnoyarsk from September 24 to October 3, 2021. It gives the details about the participants and the proceedings. The purpose of the Conference is to share the experience of leading experts in the application of modern methods of applied physics and information technology in high-tech production, in the fields of aerospace, energy, chemical and oil and gas engineering, as well as in modern areas of neuroinformatics and modeling of nonequilibrium systems. The JSC “ISS-Reshetnev Company” and Siberian Scientific Centre DNIT sponsored the Conference.

scholarly journals Improve The Efficiency Of The Study Of Complex Reservoirs And Hydrocarbon Deposits - East Baghdad Field

2020 ◽  
Author(s):  
Sudad H Al-Obaidi
Keyword(s):  
Oil And Gas ◽  
Water Saturation ◽  
Well Logging ◽  
Well Testing ◽  
Petrophysical Parameters ◽  
Oil And Gas Fields ◽  
Hydrocarbon Fields ◽  
Gas Fields ◽  
Hydrocarbon Deposits

Practical value of this work consists in increasing the efficiency of exploration for oil and gas fields in Eastern Baghdad by optimizing and reducing the complex of well logging, coring, sampling and well testing of the formation beds and computerizing the data of interpretation to ensure the required accuracy and reliability of the determination of petrophysical parameters that will clarify and increase proven reserves of hydrocarbon fields in Eastern Baghdad. In order to calculate the most accurate water saturation values for each interval of Zubair formation, a specific modified form of Archie equation corresponding to this formation was developed.

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