The authors analyze the oil potential of locally productive formations within the territory of the Romashkinskoye field. Geological knowledge on these units is insufficient, the available data are fragmentary and need to be classified and integrated. This paper presents some recommended practices for further exploration of the Devonian and Carboniferous formations of the Romashkinskoye field.

Method for laboratory determination of the relative permeabilities for different temperatures using unsteady-state displacement experiments was developed. Method was used in experiments with compressed model made from highviscous oil saturated sands of Ashalchi oilfield. Simple formulas to access optimal reservoir heat temperature using rela - tive permeabilities for different temperatures were suggested. Correlation of optimal reservoir heat temperature vs. oil and gas prices ratio was determined using experimental data. It was determined that dependence of the relative permeability from temperature strongly affected on results of thermal recovery simulation. This suggests that application of same relative permeability functions for all temperatures in thermal recovery simulation models is incorrect.

In the present paper the problems associated with reservoir conditions’ modeling in the laboratory coreflooding experiments were considered. The main cases of mismatching between laboratory experiments’ results and the field data were reviewed, the possible reasons of these mismatches were described, their significance was estimated and ways of solution of the problem were offered.

Domestic and foreign experience in well completion has been analyzed. This paper defines the upcoming trends and presents recommendations for adaptation of well completion technologies to the conditions typical of oil fields of TATNEFT Company. The pilot work has been done and recommendations for broad application of these technologies have been worked out.

The authors offer the technology to protect producing formations, minimizing formation damage from invasion of drilling fluids and cement slurries. The paper presents case studies of the technology and comparative analysis of wells’ performance for conventional wells and wells constructed using the offered technology.

This paper discusses the results of drilling of slim holes on the fields operated by Tatneft Company. Compared with drilling of conventional wells, slim holes display a number of benefits: decreased cuttings volume, mud and tubulars consumption; amount of cement required for casing cementing is reduced; drilling costs are reduced by 20-30 %; wells can be drilled with mobile drilling rigs.

This paper presents a profile of incremental oil production obtained at the Romashkinskoye field and other oil fields of the Republic of Tatarstan using different improved/enhanced oil recovery methods. It is shown that oil production increment due to standard techniques application (well drilling, EOR, reactivation of wells that have been out of production) has been reduced compared with that achieved using improved water flooding systems and other methods. The paper also discusses the main optimization trends for development systems at high levels of oil reserves depletion.

While waterflooding is a standard method used to develop terrigenous reservoirs, for development of carbonate reservoirs Tatneft OAO extensively uses horizontal technologies, that is, drilling and operation of wells with complex configuration including horizontal and multilateral horizontal wells. Horizontal technologies help to decrease total number of planned wells as well as optimize technical and economic performance of reservoirs under development. The main benefit of horizontal drilling become available.

The Republic of Tatarstan possesses significant reserves of heavy oil and bitumen. This paper describes the results of steam gravity recovery of oil using U-shaped horizontal wells due to the geological conditions of the Ashalchinskoye field. Some features of U-shaped horizontal well pairs operation are presented.

New classification of waterflood method based on the analysis of well patterns for standard waterflood systems is offered.

The purpose of this paper is to develop the technology for differentiation of oil reservoirs according to percolation index, and, thereupon, to gain more accurate permeability/porosity curves. The survey was carried out with a large volume of core material acquired from Lower Carbon deposits in oil fields of Tatarstan (Russia). It resulted in surveying of petrographic and petrophysical features of core, in studying of porosity and permeability distribution, electrical resistivity, bound water, and in estimation of percolation index boundaries for differentiation of reservoirs. Refined permeability-porosity curves were generated in identified percolation index intervals which are characterized by a higher level of connection and therefore improve reliability of permeability estimation resulting from well logging data interpretation. The acquired data indicates that the technology may be used in other areas and in other lithological sequences during solving of geological tasks and development of oil fields.

The paper presents practical results of commercial application of dual completion technology in TATNEFT Company, results of pilot operation of the formation tester specifically designed for dual completion systems, as well as description of new dual completion and downhole water pumping approaches

The paper discusses the issues of interpretation of long term pressure data recorded under packer in dual completions. It has been demonstrated that Saphir software package allows solving this problem. Special focus is on various problems associated with interpretation of long term pressure data.

The technique of an estimation of filtration parameters of a layer and quality of carrying out of hydrofracturing by the level recovery curves is offered. The analysis of conductivity and of a crack length effect on the well production is carried out.

The paper presents the technology of casing string repair with metal patches developed by TatNIPIneft, as well as results of downhole performance.

To evaluate operating efficiency of pump systems, oil production engineers should know causes and effects of changes in pump rod performance. This paper presents a scientific validation of data set required to forecast the remaining life of production equipment and reduce the risk of rod breakage.

Currently Tatneft Company produces more than 11 million tons of sulfurous oil annually. After GOST R 51858-2002 specifying the limiting concentration of hydrogen sulfide in stock-tank oil has been put in action, wide-scale investigation and development of effective H2S removal methods have come to the forefront of the company’s activity. Neutralization of H2S with chemical agents has proved its effectiveness, and what is equally important, this method does not call for heavy investments.

The paper presents the legal framework of associated petroleum gas utilization in oil fields of Russian Federation. Possible scenarios of associated petroleum gas utilization have been analyzed. The authors justify the methods of associated petroleum gas utilization, which have found application in Tatneft Company.

The authors discuss the mechanism of ingress and accumulation of subsurface degassing products (fluids, gases, and heavy metals salts) in soils. Results of geodynamic and lithogeochemical survey were used to study geochemical landscape of the Kirmen-Tanaiskaya area of the North-Tatarian Arch. Natural mechanism of heavy metals salts accumulation in soil has been determined. Etiological role of heavy metals in ecosystems has been analyzed, and procedure of remediation of the latter by use of concentrator plants has been offered.

On the basis of theoretical model of low-frequency acoustic vibrations effect on the oil-saturated porous reservoir, it is shown, that at acoustic waves propagation in biphase fluid saturated porous hydrophilic media the existence of the additional damping mechanism, connected with а resonance absorption of a wave energy by a capillary-trapped part of residual oil, is possible. The size of additional absorption factor depends on a wave frequency, reservoir parameters and a current reservoir oil-saturation in absorption zone. It is shown, that it is possible to determine the distribution of residual reserves on the area of an investigated site and to specify a stage of its development, using system - a source in one well - receivers in the next wells.

On the territory of Arlanskoe oil deposit 18 wells with special casing pipes equipped with glass-reinforced plastic liners and one well with glass-reinforced plastic casing pipe of discontinuous conductivity (USPTU engineering developed)  have been organized. Results of geophysical exploration in these wells, are shown. For every single well analysis of oil saturation dynamics of producing interval is made. Recommendations for development control are made.

Numerical modelling of cyclic flooding on the test model, as much as possible approached by geological characteristics to fields of the Orenburg Region, are executed. Results of research of development of reservoirs, undersaturated with an oil, are offered.

The mathematical model of acidizing in carbonate is developed. Two phase displacement of oil by acid water solution is presented. Both acidizing and acid fracturing are evaluated. Some real cases are analyzed, good agreement of field and calculated data are achieved.

Formation damage, a common problem associated with field operations, is often a major factor in reducing the productivity and injectivity of a well in a petroleum reservoir. The main formation damage mechanisms were considered  in the article. Laboratory and field formation damage experiments were analyzed that describes a number of factors  affecting on kinetics of permeability damage. As a result a typical relation of permeability reduction was obtained. A profile of permeability distribution related to radius and time of filtration is considered.

Results of serial treatment of producing wells of Republic Kazakhstan Uzen field are given. The data of treatment of wells at significant injection wells influence on them are analysed. The efficiency of serial treatments of producing wells is established.

Backfill compositions testing parameters are given. The rating of backfill materials application by kinds of repair and isolationworks is established. Methods of research and diagnostics of sources of water troubles are considered. The complex of requirements to laboratory research of reagents for repair and isolation works is developed and systematized.

It is noted mechanical impurities occurred in the samples of hydrogen sulfate-containing fluid “Tatarstan” in the form of silica sand or clay inclusions reduce the performance of the corrosion inhibitor. The residual concentration of the corrosion inhibitor was established by NMR-spectroscopy. The critical density of the mechanical impurities drastically reducing the efficiency of the corrosion inhibitor was specified.e efficiency of the corrosion inhibitor was specified.

The temporary underground oil gas storage in condensate pool of the Yareyu field, located in the territory of the Nenets Autonomous District, is considered. The dynamics of pumping and gas extraction is given. The structure of capital investments in this underground gas storage construction is given. The flowchart of economical evaluation of its creation and operation is presented.

Memories of the establishment of a gaslift-complexes on the Samotlor field