scholarly journals Geological conditions of generation and distribution of abnormal high formation pressure in Ninotsminda and Manavi fields sedimentary cover (near Tbilisi oil and gas region)

2020 ◽  
pp. 75-104
Author(s):  
Mevlud Sharikadze ◽  
◽  
Irakli Tavdumadze ◽  
Zurab Suramelashvili ◽  
◽  
...  
Keyword(s):  
Oil And Gas ◽  
Sedimentary Cover ◽  
Wide Distribution ◽  
Formation Pressure ◽  
Well Drilling ◽  
Deep Well ◽  
North East ◽  
Abnormal Pressure ◽  
Geological Conditions ◽  
Pressure Maximum

Abnormal high formation pressure (AHFP) zones are widely spread in sedimentary cover of numerous oil and gas regions of the world and our fields are among them. A lot of money and time are spent on elimination of some drilling complications of relevant intervals and that makes well costs more expensive. Therefore, study of forecast abnormal pressure generation and distribution zones is one of the current problems of deep well drilling activities. According to the drilling, geological and geophysical data analyzes and references, the generation of abnormal pressure in the sedimentary cover of the studied territory is mainly caused by: the existence of long submerged sedimentary basin, wide distribution of thick plastic clayey formations enriched with bentonite, primate of submersion velocity against persistence of hardening of faeces, intense folding of formations and frequent network of fault dislocations. Stratigraphically AHFP zone corresponds mainly with Middle Sarmatian-Maikopian-Upper Eocene clayey-sandstone suit distribution intervals. Formation pressure maximum gradient within the region varies from 1.75-1.85 to 2.00-2.20, intervals of distribution AHFP zones - from 600-2200m to 3700-4500m, thicknesses - from 700-2100m to 2500-3000m. Indicators of the given parameters generally increase roughly from South-West to North-East towards the thicknesses of plastic clayey formations, their submersion depth and tectonic tense growth factor. Besides, geological characteristics of some particular areas cause some adjustments: AHFP zone is hypsometrically aroused in the hinge lines of fault anticlines and is sunk in syncline depressions, thickness and formation pressure gradients are less in anticlines than in synclines.

scholarly journals Problems of small and junior business in the oil and gas industry of the Russia. Part 2. Development options

2020 ◽  
Vol 15 (4) ◽  
Author(s):  
S.M. Astakhov ◽  
◽  
A.M. Astakhov ◽  
Keyword(s):  
Empirical Study ◽  
Small Businesses ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Well Drilling ◽  
Gas Industry ◽  
Active Involvement ◽  
Geological Conditions ◽  
Geological Information ◽  
The Cost

Based on the empirical study conducted in the first part of this article, a description of the problems hindering the development of small and junior business in Russia is described; the steps to move this process off the ground are given. The following mechanisms are proposed: a multiple reduction in the cost of exploratory drilling; regulation of the circulation of geological information to create a market for multi-client geophysical and geochemical services; active involvement of small businesses in exploration by regular licensing rounds. The mechanisms are embedded in the system with the creation of pilot sites that are geographically and geologically fixed in the zones of the petroleum bearing areas with developed infrastructure and with well-known geological conditions for well drilling.

Directional Radial Drilling Increases Reservoir Coverage with Precise Wellbore Placement Resulting in a Significant Production Increase from a Thin Reservoir

2021 ◽  
Author(s):  
Ayrat Bashirov ◽  
Ilya Galas ◽  
Marat Nazyrov ◽  
Dmitry Kuznetsov ◽  
Azamat Akkuzhin
Keyword(s):  
Soviet Union ◽  
Oil And Gas ◽  
Sedimentary Cover ◽  
Thick Layer ◽  
Komi Republic ◽  
Carbonate Sediments ◽  
North East ◽  
The North ◽  
Post War ◽  
Radial Drilling

Abstract In many oil and gas provinces not only in Russia, but throughout the world, carbonate strata make up a significant portion of the sedimentary cover, and large accumulations of hydrocarbons are associated with them. However, the purposeful study of them as reservoirs for hydrocarbons in our country practically began only in the post-war years. In the special petrography laboratory carbonate rocks composing various stratigraphic complexes of almost all oil and gas provinces of the Soviet Union were studied, and in particular, Paleozoic carbonate strata of the Timan-Pechora province, Ural-Volga region, Belarus, Kazakhstan, ancient Riphean-Cambrian formations of Yakutia and relatively young strata of the Late Cretaceous of the northeastern Ciscaucasia. Carbonates are widespread sedimentary rocks. A very significant part of them was formed in the conditions of vast shallow-water marine epicontinental basins. A large number of works are devoted to the study of such deposits. However, issues related to the conditions of formation of carbonate sediments and their postsedimentary changes cannot be considered resolved, as well as the classification of the rocks themselves. The analyzed field is the Osvanyurskoye one. It was discovered in 2007. The field is located in the north-east of the European part of the Russian Federation, 2 km from Usinsk in the Komi Republic. The field is a part of the Timano-Pechora oil and gas province and it is a mature field (fig. 1). The objective was a 2.5m thick layer of the Serpukhov horizon.

scholarly journals Estimation of Wellbore and Formation Temperatures during the Drilling Process under Lost Circulation Conditions

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Mou Yang ◽  
Yingfeng Meng ◽  
Gao Li ◽  
Yongjie Li ◽  
Ying Chen ◽  
...  
Keyword(s):  
Heat Exchange ◽  
Oil And Gas ◽  
Exchange Process ◽  
Drilling Process ◽  
Formation Temperature ◽  
Well Drilling ◽  
Lost Circulation ◽  
Deep Well ◽  
Completion Process ◽  
Oil And Gas Resources

Significant change of wellbore and surrounding formation temperatures during the whole drilling process for oil and gas resources often leads by annulus fluid fluxes into formation and may pose a threat to operational security of drilling and completion process. Based on energy exchange mechanisms of wellbore and formation systems during circulation and shut-in stages under lost circulation conditions, a set of partial differential equations were developed to account for the transient heat exchange process between wellbore and formation. A finite difference method was used to solve the transient heat transfer models, which enables the wellbore and formation temperature profiles to be accurately predicted. Moreover, heat exchange generated by heat convection due to circulation losses to the rock surrounding a well was also considered in the mathematical model. The results indicated that the lost circulation zone and the casing programme had significant effects on the temperature distributions of wellbore and formation. The disturbance distance of formation temperature was influenced by circulation and shut-in stages. A comparative perfection theoretical basis for temperature distribution of wellbore-formation system in a deep well drilling was developed in presence of lost circulation.

scholarly journals The problem of abnormally low formation pressure on the oil and gas fields in Ukraine

2020 ◽  
pp. 17-22
Author(s):  
A. Pokhylko
Keyword(s):  
Pressure Gradient ◽  
Oil And Gas ◽  
Low Pressure ◽  
Formation Pressure ◽  
Gas Field ◽  
Oil And Gas Fields ◽  
Geological Conditions ◽  
Remaining Oil ◽  
Oil And Gas Field ◽  
Gas Fields

The article presented information about specific of geological conditions depleted oil and gas fields, which has Remaining Oil and Gas in Place. The reasons of abnormally low pressure nascency in the deposit has been analyzed. The article presents information about influence of geodynamic processes and structural and tectonics of Earth crust to formation pressure. The information about availability of initial abnormally low formation pressure in Ukrainian Oil and Gas-Condensate fields has been written. Supposition of nascence the abnormally low formation pressure in difficult oil/water/gas saturation geological formation has been analyzed. The drop of pressure in of initial formation has been analyzed and researched. The article presented that drop of pressure gradient in main Ukrainian oil and gas fields is equal to the value of abnormally low formation pressure.The problems of considerable remaining Oil and Gas in with abnormally low pressure in Ukrainian oil and gas field deposit has been analyzed. The information about oil and gas reservoir conditions of depleted field and brown fields in Ukraine has been analyzed.The plot of the formation pressure gradient decreasing for Chornukhynske, Denysivske, Solokhivske, Druzheliubivske, Tymofiivske and Yablunivske fields has been presented. The drop of pressure to abnormally low in Chornukhynske, Denysivske, Solokhivske, Druzheliubivske, Tymofiivske and Yablunivske fields has been established. The problems of drilling and cementing in the well with abnormally low pressure has been describe. Difficult geological conditions in Ukrainian oil and gas field deposit has been analyzed.The article shows the importance to control parameters of all technological liquids, especially density of drilling and cementing liquid in a time of drilling well with abnormally low pressure. The article shows the aspect of the using of lightweight grouting solutions for mounting wells with abnormally low reservoir pressures, the importance of controlling the contamination of the bottom zone of the formation and preventing the occurrence of hydraulic fracturing during cementing.

scholarly journals GEOLOGICAL CONSIDERATION FOR CO2 STORAGE IN INDONESIA: A BASINAL SCALE OUTLOOK

2015 ◽  
Vol 1 (1) ◽  
Author(s):  
Hendra Amijaya
Keyword(s):  
Carbon Dioxide ◽  
Oil And Gas ◽  
Carbon Dioxide Capture ◽  
Co2 Storage ◽  
Geothermal Gradient ◽  
Gas Reservoirs ◽  
Coal Beds ◽  
North East ◽  
Geological Conditions ◽  
And Storage

Carbon dioxide capture and storage (CSS) is alternative of reducing atmospheric emissions of CO2. The concepts of CO2 storage refer to the injection of carbon dioxide in dense form into aquifers, which basically must meet several conditions. Three types of geological formations that can be used for the geological storage of CO2 are oil and gas reservoirs, deep saline formations and unmineable coal beds. Indonesia has 60 Tertiary basins, however that great precautions must be taken for selecting particular sedimentary basin in Indonesia for carbon dioxide storage because of high possibility of leakage and the need to find deep formations as CO2 host since the geothermal gradient is high. One possibility to find proper basins is by selected “mature” basin as the detailed geological conditions are well known. Candidates are are North East Java or South Sumatra Basins. Keywords: Carbon dioxide capture, storage, emission, basin.

scholarly journals НАУКОВІ ТЕНДЕНЦІЇ БУРІННЯ ГЛИБОКИХ НАФТОГАЗОВИХ СВЕРДЛОВИН

2019 ◽  
Vol 1 (1(31)) ◽  
pp. 18-21
Author(s):  
Мирослава Чернова
Keyword(s):  
High Pressure ◽  
Corrosion Fatigue ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Well Drilling ◽  
Gas Industry ◽  
Deep Well ◽  
Deep Wells ◽  
Deformed State ◽  
Drill Column

The essential problems in oil and gas industry are corrosion-fatigue breakage of drill column elements, sticking of drilling and heavy-weight drill pipes, taking place in drilling of directional and horizontal wells. The stickings are caused by friction, emerging between sides of hole and elements of drilling column. The frictions block assurance of core integrity in core receive. The failure resistance by using polymer and composite materials for surface treatment under influence of triboprocess and corrosion-fatigue breakage is considered in the article.The problem of deep well drilling is considered, which is connected with the prevention of the seizure phenomenon between the walls of the drill column and the barrel of deep wells. The design of the coupling connection of casing pipes with a high pressure sealing element is provided to provide the tightness of the casing columns at high pressure and temperature parameters. The elastically deformed state of the pipes with the inserted sealing element is scientifically substantiated.

scholarly journals Western part of the Terek-Caspian trough as a zone of unloading of deep fluid systems

2020 ◽  
pp. 103-112
Author(s):  
A.A. Daukaev
Keyword(s):  
Upper Cretaceous ◽  
Oil And Gas ◽  
Sedimentary Cover ◽  
High Amplitude ◽  
Fluid Systems ◽  
Abnormal Pressure ◽  
Deep Faults ◽  
Mechanisms Of Formation ◽  
Deep Fluid ◽  
Cretaceous Deposits

The article describes the mechanisms of formation of the Terek and Sunzha anticlinoria as the main zones of oil and gas accumulation. An assumption is made about the formation of high-amplitude anticlinal folds in the Upper Cretaceous deposits as a result of vertical migration of high-pressure fluids along deep faults with a breakthrough of their upper horizons of the sedimentary cover into the late orogenic phases of folding. The main prerequisites for the deep genesis of oil and gas are listed – a pronounced unevenness in the distribution of hydrocarbon accumulations, abnormal pressure, hydrochemical anomalies.

scholarly journals Development of a fluid-dynamical model (DFM) of the Yamal Novoportovsky oiland gas-condensing deposit (based on DFM seismic data interpretation)

LITOSFERA ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 752-766
Author(s):  
V. B. Pisetski ◽  
K. S. Ivanov
Keyword(s):  
Oil And Gas ◽  
Sedimentary Cover ◽  
Fluid Flows ◽  
Data Interpretation ◽  
Dynamical Model ◽  
Tectonic Activity ◽  
Current State ◽  
Abnormal Pressure ◽  
Dynamical Parameters ◽  
Fluid Dynamical Model

Research subject. The idea of forecasting fluid-dynamical parameters is based on the views connecting the processes of sedimentation, tectonogenesis and fluid flows into an active fluid-dynamical model of the “sedimentary cover–basement” system. In such models, main fluid-dynamical parameters of oil and gas collectors, i.e. penetration and the vector of the fluid flow, are functionally connected with the components of the current state of the rock massif having a discrete (block) structure. These parameters can be calculated using DFM-interpretation technology developed by the authors in their previous works.Materials and methods. For the first time, DFM results are provided for the Yamal Novoportovsky oiland gas-condensing deposit. Here, the paleozoic basement stripped at a depth of 2700–3200 m is largely represented by metamorphic schists and marbled limestones. The basement has been covered by sediments and a platform cover since the early Jurassic age. The forecast of parameters describing modern geodynamical processes was performed on the basis of a comprehensive tectonophysical analysis of major geological and geophysical data.Results. The main axes of the neo-tectonic activity of the plate complex break the area under study into a quite regular block system that reflects a right-sided shift of fundamental blocks, that, in its turn predetermines the block shift in plate complex with the turn of the shift axis by 30 degrees. The most significant oil and gas holes in terms of influx demonstrate a connection with the described scheme of block activity. Thus, practically all high-debit boreholes were drilled in active axial zones.Conclusion. The proposed scheme of block activity satisfies the general principles of geodynamics. The developed model of abnormal pressure estimations by main productive intervals shows a good agreement with the distribution oiland gas boreholes in terms of productivity. Contact zones of active blocks present a particular interest from the standpoint of selecting the location of high-debit boreholes. These zones should be taken into account when developing new oil and gas deposits. 

Formation Pressure Inversion Method Based on Multisource Information

SPE Journal ◽  
2022 ◽  
pp. 1-17
Author(s):  
Zhi Zhang ◽  
Baojiang Sun ◽  
Zhiyuan Wang ◽  
Shaowei Pan ◽  
Wenqiang Lou ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Geological Structure ◽  
Measured Data ◽  
Inversion Method ◽  
Formation Pressure ◽  
Uncertainty Distribution ◽  
Pressure System ◽  
Abnormal Pressure ◽  
Wellbore Pressure ◽  
Accumulation Trend

Summary The exploration and development of offshore oil and gas have greatly alleviated the tension of global oil and gas resources. However, the abnormal pressure of offshore reservoirs is more common compared with terrestrial oil and gas reservoirs, and the marine geological structure is complex, with the development of faults, fractures, and high and steep structures, which leads to the strong anisotropy of formation pore pressure distribution and uncertainty of pressure system change. In this paper, considering the corresponding characteristics of the randomness of the formation pressure prediction results in the Eaton equation for their respective variables, a formation pressure inversion method based on multisource information, such as predrilling data, bottomhole while drilling data, seabed measured data, and surface measured data, is established. On this basis, combined with the data of a well in the South China Sea, the variation law of the uncertainty of formation pressure prediction results under the conditions of predrilling data, measurement while drilling (MWD) data, and their mutual coupling is analyzed. The simulation results show that the uncertainty distribution of formation pressure prediction based solely on predrilling data shows linear accumulation trend with well depth, and the formation pressure inversion method based on multisource information can significantly curb the increasing trend of uncertainty when MWD data are introduced. Therefore, through the analysis of typical change patterns of monitoring parameters under normal/abnormal conditions during drilling, combined with the method of multisource information, the abnormal pressure information can be accurately predicted and inversed, which provides important support for wellbore pressure regulation under complex formation conditions.

scholarly journals Dynamic design method of wellbore structure during drilling operation based on LWD

2020 ◽  
Author(s):  
Sheng Ya-nan ◽  
Li Weiting ◽  
Lan Kai ◽  
Jiang Jinbao ◽  
Kong Hua
Keyword(s):  
Risk Assessment ◽  
Design Method ◽  
Good Method ◽  
Assessment Method ◽  
Risk Identification ◽  
Structure Design ◽  
Formation Pressure ◽  
Well Drilling ◽  
Deep Well ◽  
Risk Assessment Method

AbstractAt present, there is no good method or technology for quantitative evaluation of wellbore structure and engineering risk in the process of deep well drilling in complex formation, and there is no rational understanding of engineering risk mechanism. With the development of MWD and transmission technology, the formation pressure and rock mechanics parameters of the drilled section can be accurately determined in the process of drilling, which provides a basis for the well bore structure and engineering risk assessment in the process of drilling. This paper makes full use of the advantages of MWD and other technologies to seek a method to improve the accuracy of formation pressure prediction with narrow safe density window On this basis, the risk identification methods of leakage, blowout, collapse, sticking and other engineering risks in the process of drilling are studied, and the risk assessment method of dynamic wellbore structure in the process of drilling is established; at the same time, the uncertain parameters in the existing wellbore structure design method are studied, and the design method is improved, so as to minimize the risk of well structure design.

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