The article discusses the results of a multi-criteria assessment of the oil and gas potential of the deep-lying Lower Middle Jurassic and Paleozoic deposits of the Yamal Peninsula and the adjacent territories and waters of the Kara Sea for 25 local sites. The ranking was carried out according to the degree of prospects for the layers (groups) and perspective objects.
The aim of the work is to study the structural and tectonic features of the structure of the pre - Jurassic base of the Shuginsky small shaft, to develop criteria for the search for hydrocarbon deposits in the deep Paleozoic horizons. Collected and analyzed materials generalization of geological and geophysical data and research works on the study of pre-Jurassic sediments in the territory of the Yamal-Nenets Autonomous district and Western Siberia. The interpretation of 3D, 2D seismic materials in the range of the Paleozoic complex is carried out. For the first time, an upthrust-thrust structural-tectonic model of the pre-Jurassic complex was created, seismic complexes were identified: Triassic, Permian, Carbon, Devonian. General search criteria for the detection of hydrocarbon deposits in the pre-Jurassic YANAO complex have been developed. Discovered a new geological phenomenon within Shuginsky shaft - structure horizontal shear in the sedimentary cover, and unusual assemblage of structures in the basement - structure "propellers".
In present work lithologic features and filtrational and capacitor properties (FCP) of rock-reservoir sheshminian strata of the of superviscous oil (SVO) field are investigated. The reservoir according to the description of a core material presented by non-uniform petrosaturated sandstones in various degree with prevalence caicium and clay differences. According to tabular data FCP and physical properties of sandstone layer are studied; the tendency of deterioration in efficiency of layer down a section is established: decrease in coefficients of open porosity, vertical permeability and oil saturation. Curve variations FCP on a well No. 1 section are for descriptive reasons constructed. Major factor of deterioration FES down section, most likely, increase in content of carbonate material. In addition correlation connection between filtrational parameters is established. 2 groups of the interconnected parameters with correlation coefficients more than 0,5 are allocated: 1) porosity- calcareousness-vertical permeability; 2) oil saturation calcareousness. Based on results of the previous researches of sheshminsky sandstones, authors have made assumption that the deterioration tendency down a section is explained by migration of reservoir waters from underlying deposits of the Sakmarian age.
The possibility of prediction of the geologic section below the TD distinguishes the method of vertical seismic profiled (VSP) from all other methods of geophysical researches of wells. In the VSP method the incident waves and waves rifled from the seismic boundaries, located under the well bottom, are recorded simultaneously. Thus, in contrast to surface seismic exploration, a more correct solution of the inverse kinematic and dynamic problems, aimed for the study of the section below the well bottom, is provided. Several versions of the VSP method are currently used, each of which has a number of advantages and disadvantages. The combination of different versions allows one to study the elastic properties of the subsurface and the section under the bottom of the well by using of kinematic and dynamic parameters of waves of different types and classes.
This work presents a novel design of an open-type chain drive for a sucker-rod pumping unit with a 3.5-m length stroke and a 35 kN load capacity. This chain drive is mounted directly above the well head, and is an optimal solution for rod-lift production of low-volume wells. For the chain drive body, double tee profiles with parallel faces are used, which serve as both a support structure and balance weight guides. The paper presents technical characteristics of the new-design chain drive in comparison to PTs 30 model chain drive developed by the Bugulma Mechanical Plant, as well as a case study. The authors analyze technical solutions and consider ways to improve the chain drive design. It is recommended to reduce weight of the chain body, use a screw-pile foundation, and dismountable guides made of high-grade steel.
Materials and methods
GOST 26020-83 I-beam No. 55 with Parallel Flange Edges, cylindrical triple reduction gearbox 1TsZU-160-100-31-U1, 2.2-kW explosion-proof motor 4ВР90L4 with shaft speed of 1430 min-1, roller chain 1NP 50.8-145 with breaking strength of 263 kN, roller chains 1NP 31.75-192 with breaking strength 100 kN. Theoretical substantiation of technical characteristics and operational advantages, design and construction of test specimen, filed testing, analysis of test results.
A new chain drive was designed to enable lifting capacity of as high as 35 kN, stroke length of 3.5 m and oscillation frequency from 0.5 to 2.5 min-1. Field tests confi both serviceability of the drive and its compliance with specifi ation requirements. At the same time, some challenges during wellhead operations were revealed. These were associated with limited-access conditions within drive sub-frame.
Lessons learned from development, construction and fi d testing of PTs 35-3.5-0.5/2.5 chain drive test specimen brought forth further design improvements. Particularly, the housing of the drive may be implemented as an independent lightweight metal structure while replaceable, space-adjustable guideways may be made of mechanically upgraded steel to ensure high quality of the surface. Appropriate drive base plates are screw piles screwed into the ground up to fi soil level and below soil frost depth in winter.
As the reservoir fluid is extracted from the oil-bearing reservoir, the natural energy, under the action of which the fluid flows into the production wells, decreases and, as a result, the flow rates of production wells drop down. Currently, the newly commissioned oilfields in the Republic of Tatarstan and the Ural-Volga region are characterized by the presence of viscous oil and low reservoir pressure, as well as directionally drilled the wellbores. In this regard, the task of oil recovery enhancement, creating a way to intensify oil production under conditions of low reservoir pressure and high viscosity of the production becomes urgent. The article proposes a comprehensive method to develop a highly viscous oil fi d, comprising drilling a system of interconnected vertical and horizontal wells. Experience in creating a hydrodynamic connectivity in a fragment of an oil well system and the results of the steam-heat and chemical treatment of the bottom-hole zone of this fragment are also presented.
Currently, in the field of oil production, horizontal and controlled directional wells, as well as sidetracks, are widely used since they provide a large area of contact between the producing reservoir and the wellbore. The operation of such wells by serial borehole sucker rod pumps is limited by the maximum allowable angle of inclination of the sucker rod pump. Also a complicating factor in the exploitation of oil fields, in particular the Ural- Volga region, is the presence of high-viscosity oils. The article presents the operational experience of the developed differential pump units for controlled directional and horizontal wells in complicated conditions, including at slope angles higher than permissible for serial pumps. The installation is certified, its serial production is mastered, it is introduced on 12 wells.
For efficient development of oil fields, oil companies are forced to apply new technologies in their production and to search for highly efficient solutions optimizing the process of oil production. One of the directions of optimizing intensification in terms of hydrocarbon production technology is the technology of simultaneous-separate operation (WEM) of formations in one well. The use of experimental data allows us to show the effectiveness of the WEM in the development of Tournaisian, Visean and Vereisk-Bashkir sediments, but at the same time, further experimental work is needed to involve other developed horizons.
The combination of the conditions (stress- strain state and temperature) and rheology (creep) of rocks in certain horizons, especially for rock salts, leads to stress concentration during the construction and / or operation of wells, which leads to the destruction of the well design. Therefore, the selection and study of the rheological characteristics of rock salts from the East Siberian deposits should be put into practice. The paper presents the results of laboratory studies of rock salts in the context of one of the field in Eastern Siberia and the construction of an elastic- visco-plastic model for calculating the dependence of the creep pressure on the casing on time. According to the results obtained, recommendations are made for choosing a casing string at a given service life of the well design.
The paper describes the evolution of design decisions for the development of the gas-oil zone of AB1-5 reservoir, an assessment of the current fl type of the gas cap zone, the main assumptions and a strategy for further development of the gas-oil zone and the gas cap of the Samotlor Field.
The purpose of this work is to identify the interaction between the developed and undeveloped oil deposits in a multi-layer field, complicated by the fault causing hydrodynamic connection between the layers. The study is carried out through flow simulations for a hypothetical sector of a multi-layer oil field. The multivariate calculations carried out made it possible to conclude that the presence of a hydrodynamic connection through the fault between the developed deposit and the deposit left for later production can significantly influence production dynamics, and lead to changes in reserves, composition and properties of reservoir oil in the undeveloped deposit before putting it into production.
PJSC TATNEFT is implementing a program to optimize production and reduce its own costs. Reducing the cost of operating onshore oilfi d equipment is one of the most important tasks under the program. This article describes a method to increase the turnaround time of pumping units for pumping the produced liquid by upgrading equipment.
Hydroelastic systems can be characterized by the simultaneous manifestation of elastic and hydrodynamic instabilities and their interaction. Consideration is given to mutual effects of gas pipeline bending, internal and external pressures, action of the compression force and fluid with a set density flowing along the pipe, axisymmetric expansion of a pipe and its longitudinal shortening, change of temperature of a wall of a pipe. The smallness of inertial forces is conditioned by a relatively slow change of disturbances under slowly changing external effects (compressive forces in the pipe, hydrostatic forces, velocity of gas motion in the pipe). External effects can be both independent and interconnected with each other. Here, the static mutual influence between those instabilities is called the instability interaction in a gas pipeline. We have obtained the linearized equation of the gas pipeline bend and the critical value of the force that squeezes the gas pipeline, which represents a generalization of the classical critical value for the static longitudinal compressive force acting on the pipe in the Euler problem due to the action of pressures inside and outside the gas pipeline and the gas motion inside the pipe, axisymmetric expansion of a pipe and its longitudinal shortening, change of temperature of a wall of a pipe. The investigation is focused on static instability interactions depending on the compression force in the gas pipeline, internal and external pressures and gas velocity, axisymmetric expansion of a pipe, change of temperature of a wall of a pipe. Bending rigidity, tensile forces and external hydrostatic pressure stabilize the pipe. By contrast, compressive forces, internal hydrostatic pressure and gas movement inside the pipe at any velocity, increase in temperature of wall of pipe have a destabilizing effect.
Despite the constant development of technologies, alternative methods of protection and chemicalization of all production processes, internal corrosion of pipelines remains a key problem for the management of pipeline operation of all oil-producing organizations. The authors developed an Autonomous device for constant supply of the required volume of concentrated reagent in the pipeline, without reference to infrastructure, roads and power lines. The main market segment for the developed device-areas with lack of infrastructure, lack of power lines and access roads, as well as during seasonal off-road.
Showing the relationship between the constructive and technological process of hardening threaded conical surface drill pipe (geometry of a strengthening of the movie, the size of the load, radius of hollow), magnitude and distribution of residual stresses in a threaded surface based on complex mathematical models developed and a series of pilot studies stress-strain state threads and fatigue tests.
The paper presents the results of studies of the mechanical properties of the material of pipes made of 17G1S steel by various manufacturers of tubular products, and an assessment of the influence of these properties on the strength reliability of main pipelines. Results processing of studies for mechanical characteristics of pipe steels and the calculation of the probability of failure-free operation of main pipeline linear sections according to the strength criterion are based on the mathematical apparatus of non-parametric statistics, taking into account the actual distribution laws of the random variables under study.
The article presents the results of full scale tests, in which studied the influence of metal pipe bundles on the pipelines functionality. It is shown, that in case the influence of non-design loads on oil and gas pipelines, as well as when the genesis of metal bundles is caused by the degradation of metal properties, such defects can have a negative impact on the resistance of the pipeline to destruction.
The article is devoted to the definition of control method of Barkhausen hardened drill pipe thread. In this case, the method for hardening of constructional alloy steel is high quality surface plastic deformation deep rolling. It is particularly important that the study done non-destructive method to get data about a toughened surface layer.
An analysis of modern methods and tools for monitoring and diagnosis of technical condition of asynchronous and synchronous motors and advice on choosing the best monitoring systems for use on existing and disabled equipment. It is shown that, based on measurements of basic parameters of complex by a single system of control, maintenance and repair of electrical machines, produced on their technical condition with no planned outages, and intrusion prevention tests.
The article discusses the use of a software package, the purpose of which is to test the operation modes of the wells and to simulate the production conditions for given parameters.