One of the topical issues of drilling directional and horizontal wells with the use of downhole telemetry systems with an electromagnetic communication channel is the use of an electrical delimiter. It is part of the transmission system as a constructive basis for conducting electric and electromagnetic well logging while drilling. To solve this problem, it is necessary to evaluate the radial range of electrical probing near the well zone in order to determine the informativeness of the received data. A qualitative analysis of the structure of the probing electric field of the circuit and the calculation model of the logging is performed.
An analysis is carried out in relation to risks occurring when developing gas fields at the closing stage. A calculation of the estimated development parameters is carried out based on the geological process modeling. An opportunity is reviewed to integrate the algorithms of determination of the minimum and maximum levels of gas extraction into the geological process model. Minimum and maximum levels of the extraction are calculated considering the optimal operating mode for the well stock and process equipment of standard gas field of the West Siberia.
Extensive lithological and geochemical studies of the core of the deposits of the Bazhenov formation have been performed. Some aspects of the laboratory core research method based on the study of rock samples before and after exposure to organic solvents are considered. The depositional environment of the Bazhenov formation, the properties and sediments specifics, similarities and differences of the main deposits of the formation are described; the reasons for their differences are indicated. Characteristics of source rocks and reservoirs are given. Special attention is paid to the content of hydrocarbons in different types of rocks. The factors affecting the formation of the reservoirs in Bazhenov formations as well as the properties of various types of reservoirs and the patterns of their distribution in the vertical section and on the area are described.
The oil and gas reservoirs found in the weathered and fractured basement reservoir are considered as an unconventional hydrocarbon resources. The analysis and integration of geological and geophysical data on hydrocarbon fields found in the basement of the Cuu Long basin (The White Tiger, Dragon fields) has revealed the general features of their structure, which could be used to predict the potential of similar hydrocarbon accumulations. The decisive influence of neotectonic faults on the initial flow rate and accumulated production of production wells in the White Tiger field.
Prospecting new oil and gas deposits in Zuyatskoye field is promising due to its location near fields with oil and gas deposits in the Tula terrigenous and Vereiskian carbonate deposits. Volumetric method of the Tula and Vereiskian is used for hydrocarbon reserves calculation. Calculation of the hydrocarbon reserves were based on the contour maps of the top of pays of the Tula terrigenous and Vereiskian carbonate deposits, net oil maps, results of the production log tests in the pay zones and core analysis. Calculation parameters for the deposits were defined according to the core analysis results, well testing during drilling and casing formation tests, geology and geophysics well data and approved parameters from the adjacent ideal analogues.
The oldest Cenomanian gas fields of the north of the West Siberia have a steady tendency of the production decline yet today. The Lower Berezovskaya subformation gas was ignored before, now it attracts attention of the producer companies more often. The collector of this subseries is a complex underexplored non-traditional object promising to support gas production. Its mineral composition and basic petrophysical properties have recently been studied actively, however, the issue of the gas saturation level is still open.Argillous gaizes represent the Lower Berezovskaya subformation reservoir. This work provides the first evaluation of the saturation in this reservoir based on the interpretation of the geophysical studies of wells and encapsulated core analysis. It also reveals and describes the connection between the mineral composition of the gaizes, the structure of the voids, and the gas saturation.
Reservoirs of the Lower Berezovskaya subseries are fine-grained gaizes argillic to a variable degree. The reservoirs are commonly believed to be non-traditional due to an uncharacteristic combination of high porosity (at an average of 32%) and low permeability (below 1?10-3 um2). primarily. As this work shows, this is explained by the fact that the main part of pores (up to 75%) of the rocks in question is of subcapillary sizes making fluid movement practically impossible. At that, rock lithology affects the voids structure significantly. Thus, reservoirs with different content of the amorphous silica have different effective gas-filled porosity. Quantitate evaluation of the part of the differently sized pores among the voids in common is a lithological-capacitive model of the voids structure allowing describing these differences and forecasting possible effective gas-filled porosity of the reservoirs in question.
The paper presents a technique for constructing a parametric petroelastic model of oolitic limestone on the core scale using the approaches of the Effective Medium Theory (Rock Physics), data on the microstructure of the rock, and the velocities of elastic waves in the rock. Parameters of the petroelastic model characterize the structure of the void space of the rock and include the shape of intergranular and oolitic pores, as well as the degree of connectivity of pores in the matrix and oolites. The results of petroelastic modeling justify the importance of taking into account the specific microstructure parameters of each particular rock for which this simulation is carried out.
Operation of Iranian high-viscosity and heavy oil fields requires increasing the efficiency of production. Traditionally, waiting for the solution of this problem using thermal and chemical methods, the implementation of which is often a very costly undertaking. The article analyzes the method of polymer flooding as a technology to improve the efficiency of production of high viscosity and heavy oil fields in Iran.
The authors emphasize the fact that surface facilities projects often lack initial data even when this data is enough for a development project. The article substantiates the role of scientific research, including basic research, for reliable design of complex facilities.
This article presents a new approach to simulating thermal gas effects using the CMG STARS software. The essence of the proposed approach is the direct consideration of various hydrocarbonand organic complexes in the geological and hydrodynamic model. This approach allows taking into account the geochemical parameters obtained on the basis of core and geophysical studies, in addition, there is a significant decrease in the computation time.
The article concentrates on the oil-field chemistry laboratory studies. The terrigenous reservoir cores of the Tula Bobrikovian horizon belonging to a range of PJSC Tatneft fields are a subject of the study in terms of the colmataging processes when treated with chemical agents (traditional acid-cut clay muds based on hydrofluoric acid and new suggested non-fluorine chemical agents (hereafter referred to as NFCA). Experimental physical methods show how using alkaline and acid solution based NFCA is promising in terms of the permeability and porosity improvement when modeling the process of well bore zone (hereafter referred to as WBZ) treatment in the terrigenous Tula Bobrikovian reservoirs belonging to PJSC Tatneft with minimized colmataging secondary sediment formation.
The article identifies problems and characteristics of using various types of hydrocarbon fuels in installations of thermal processing oflayers of heavy oil and natural bitumen. Developed fuel supply complex heat treatment of the layer of the primary and backup hydrocarbon fuel without the conversion of heat generating units, in particular the mixing regasification LPG based on the technology of Propane-air.
The purpose of this article is to justify universal and multipurpose way of unconventional oil and gas fields development with low permeable rocks based on pressure maintaining and in-situ hydrogen and hydrocarbons synthesis revealed through the authors' lab experiments.
The article examines possible fiscal expansion in terms of the oil companies business in order to increase oil production and possible implementation of the graded severance tax rate.
The article describes the problem of low efficiency of existing techniques for locating and measuring the thickness of paraffin, gums and salts deposits on the inner surface of the pipeline and submersible equipment that have been colloidally dissolved in the transported oil stream. A method based on radioisotope radiation with high efficiency, reliability, durability, ease of maintenance and easy interchangeability of the main components of the system is proposed for the control of deposits. The method allows to detect and measure the thickness of deposits in a non-contact way in a real time mode in a timely manner in order to make a further decision on choosing the most effective technique for their elimination.
Scientific and production enterprise “Piezoelectric” LLC was established in 1992 on the foundation of “Piezopribor” SDB of the Rostov State University, which for 40 years has been the main developer and supplier of piezoelectric transducers for mechanic engineering, navy, rocket and space equipment for the country.
New upgrading oil, water and gas separation technology and equipment are proposed. The novelty of the technology is in partial degassing of the NGL in the heater-treater and returning of its liquid part to the highly stabilized commercial oil pipeline to restore its petrol potential and maintain the oil-gas condensate mixture SVP at the standard level. The separator is integrated into the operating gas processing plant layout.
Set the relationship between the constructive and technological process parameters folding 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.