DOI: 10.24412/2076-6785-2023-2-33-37
Abstract
The problems of preventing and eliminating complications and accidents during drilling and fixing wells related to the stability of the walls of wells are still very relevant. Despite the constant improvement of well construction techniques and technologies aimed at reducing time and material costs due to the complexity of geological and technical conditions of well wiring.
Materials and methods
Materials: actual data of drilling of an obliquely directional with a horizontal end of an operational well at a Ñ*** field.
Methods: theoretical study and analysis of the influence of tectonic deformations on the stability of the borehole during drilling, field data on the presence of a tectonic disturbance (fault) that caused the seizure of the drill string and subsequent rock shedding.
Keywords
well drilling, tectonic deformations, borehole stability
DOI: 10.24412/2076-6785-2023-1-27-32
Abstract
The article describes an intelligent system for preventing complications during the construction of wells on land and at sea, created at the OGRI RAS. Intelligent systems for preventing complications when drilling wells are designed to warn the driller in advance about the possibility of violating the normal drilling regime. Intelligent systems to prevent complications during the construction of wells help to increase the productive time and economic efficiency of drilling oil and gas wells. Large volumes of geodata from geological and technological measurement stations during drilling vary from tens to hundreds of terabytes, respectively, on land and at sea. The creation of neural network modeling software components is aimed at identifying hidden patterns in big data sets from geological and technological measurement stations in real time.
Materials and methods
When creating the system, sets of big volumes of data from geological and technological measurement stations in Russia and abroad were used. For each type of complication, procedures were carried out for normalization and labeling of big volumes of geodata. The corrected historical Big geodatasets served as the basis for training neural networks on new geodatasets. An innovative approach to the collection of heterogeneous geodata was used. The main stages of the approach were as follows: the collection of big geodata obtained using sensors built into the drilling rig; formation of simulation data sets using
a drilling simulator; use of geological and geophysical data obtained during geological exploration; creation of test and training sets of geodata of drilling parameters; development of algorithms for cleaning Big sets of geodata using a pre-processing software module from noisy, missed geodata; clustering and visualization of large geodata (hook weight, penetration rate, drilling fluid consumption, torque, etc.). Python and Pandas libraries have become effective tools for building complex statistical models that allow you to efficiently and accurately predict, diagnose, analyze big geodata in order to improve well construction productivity.
Keywords
artificial intelligence methods, artificial neural networks, well drilling, safe well construction, prevention of complications, geological and technological information, big geodata, intelligent system
DOI: 10.24412/2076-6785-2022-2-53-56
Abstract
This article considers a variant of solving an urgent task today – reducing capital investments for the construction of a well through the use of advanced drilling technology for the casing “direction”. Namely, the analysis of the relevance of this issue was carried out, the standard cycle of well construction was considered, two alternative approaches to the stages of well construction were proposed, calculations of the economic efficiency of these proposals and a comparison of investments when using the considered techniques were made.
Materials and methods
Determination of the well fund for a calendar year for planning the work of the advanced drilling drilling team. Selection of the executive body of work on the construction of OK “direction” by a low-power machine. Assignment of a specific team to the construction of the well fund and the beginning of work at the field. Practical implementation – after completing the construction work under the OK “direction”, the team moves to a new point, and already from under the cased OK “direction” interval, further deepening under the OK “conductor”.
Keywords
oil fields, well construction, well drilling, advanced drilling
DOI: 10.24412/2076-6785-2021-6-75-78
Abstract
The article discusses the directional drilling method when pipelines intersect existing communications. The use of an alternative type of engineering survey – GPR survey method – to identify hidden complications is justified. At the same time, the GPR survey excludes the discrete nature of the soil mass studies and gives us fully the geological characteristics for designing transitions by the directional drilling method.
Materials and methods
The authors used the actual data for one of the design objects “TomskNIPIneft” JSC and the results of the geo-radiation survey. The survey reliably showed the presence of compacted objects and decompressed zones. As a result, the optimal trajectory for the underpass was chosen by the method of directional drilling.
Keywords
directional drilling, engineering surveys, geology, GPR survey method
DOI: 10.24412/2076-6785-2021-6-72-74
Abstract
The basis of the study was the regulatory and legal documents of the Russian Federation in the field of industrial and environmental safety. The effectiveness of the use of a circulation sub as a preventive measure to minimize the risks of emergency situations when drilling oil and gas wells in the fields of Western. This article describes the design of the circulation sub, which is protected by a patent for a utility model, describes the device and the principle of operation of the translator, the results of its field tests. The effectiveness of the use of the DECS series circulation translator by “SK “Drilling equipment” LLC as a preventive measure to minimize the risks of emergency situations when drilling oil and gas wells is investigated.
Based on the obtained research results, a technical solution is proposed to improve drilling efficiency and minimize the risks of accidents.
Materials and methods
Industrial safety of hazardous production facilities.
Keywords
oil and gas wells, industrial safety, drilling mud absorption, circulation sub
DOI: 10.24412/2076-6785-2021-6-68-71
Abstract
The article presents the results of laboratory studies of perfluoroethylisopropyl ketone capable of operating under negative temperatures.
Materials and methods
A synthetic substance of the ketone series, the study of physical and chemical properties.
Keywords
drilling mud, fluoroketone, cryogenic drilling, wellbore stability, permafrost
DOI: 10.24412/2076-6785-2021-2-25-28
Abstract
The paper presents the results of laboratory studies of the chemical composition of the filtrate of mineralized starch-biopolymer drilling mud, the influence of the filtrates of the studied drilling fluids on the drilling parameters, on the filtration and capacitance properties of carbonate and terrigenous oil-saturated deposits of Udmurtia deposits. The studies were carried out on samples of drilling fluids, core material, oil and reservoir water samples.
Material and methods
The following methods were used for the researches: study and analysis of the literature on the subject of the study, experimental methods in the laboratory of washing liquids based on the methods presented in GOST 33213-2014 (ISO 10414-1:2008), statistical processing of experimental data, evaluation, analysis and generalization of the results obtained. Chemical reagents and reagents used in drilling fluids when drilling wells in the territory of the Udmurt Republic were used as materials for the experimental method.
Keywords
drilling mud, filtrate, carbonate reservoir, terrigenous reservoir, alkalinity, hardness
DOI: 10.24412/2076-6785-2021-2-17-20
Abstract
The Senonian exploration project at the Ìedvezhy field (Western Siberia) will allow the study of a complex of silicite rocks of the lower Berezovskaya subformation containing hard-to-recover gas reserves. A feature of these deposits is the developed system of tectonic faults. However, the results of interpretation of seismic data are not able to provide the required accuracy in determining the boundaries and amplitudes of dislocations. As a result, the drilling of directional wells carried out in conditions of increased risks. The paper presents a real production experience of drilling a horizontal wellbore 6C in conditions of low-amplitude tectonic faults. A methodological technique is described, the use of which made it possible to identify the tectonic block boundary in real time according to telemetry data of the downhole LWD-system.
Material and methods
The method for identifying the boundaries of tectonic faults in the process of drilling horizontal wells based on the operational involvement of telemetry data from the downhole LWD system (gamma-ray logging data) to build a correlation with the pilot borehole. Correlation performed by means of an algorithm for identifying a set of sequential correlation layers and reference shale strata. The results shown as a detailed correlation graphical diagram. Based on the shift of the reference boundaries relative to the data of the pilot shaft and the geological model, conclusions drawn about the location and amplitude of the tectonic disturbance.
Keywords
lower Berezovskaya subformation, horizontal wells, hard-to-recover gas reserves, correlation of well sections, low-amplitude tectonic faults
DOI: 10.24412/2076-6785-2021-1-34-39
Abstract
The article presents the results of investigations of the causes of total and catastrophic losses of drilling mud during drilling of wells in the reef massif of the Western dome of the Yuzhno-Orlovskoye oil field. The regularities of the distribution of intervals of mud losses of different intensity in a single buried reef of the Upper Frasnian and Famenno-Tournaisian times have been established. It is noted that total and catastrophic losses in a single buried reef are confined to the zones of the pre-reef plume, consisting of detrital carbonate rocks. Partial losses occur in the intervals of cavernous-fractured carbonate reservoirs of organogenic structure. The absence or insignificant absorptions are the features of carbonates of the bioherm core of the buried reef. It is shown that the development of a geomechanical model of an organogenic structure based on the features of the lithologic and facies zones of the reef massif makes it possible to increase the accuracy of predicting the zones of absorption during well construction designing. The research results show that the system analysis and generalization of theoretical and field geological, geophysical and technical information allows to determine the nature of losses of drilling mud in organogenic structures, to predict the zones of possible problemms and to develop effective measures for their timely prevention and elimination during well drilling at the Kama-Kinel downfold system fields.
Material and methods
Survey made by gathering, review and collation of the theoretical and field data to determine patterns of the loss zones throughout reefal buildup.
Keywords
well drilling, absorption of drilling mud, organogenic buildup, single buried reefs, reef massif, depression zone, Kama-Kinel downfold system
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.
The paper presents engineering solutions utilized in directional drilling as well as the impact they have on construction of underwater passages. This is exemplified by an accident development scenario of passing through gravel and cobble soils. Following the model of stress-strain state of soils composing the wellbore and based on fluid dynamics model pertaining to drillingmud filtration, potentially hazardous process failures have been analyzed.
This paper addresses the issue of selecting a rock cutting tool to ream a pilot bore of an underwater passage as applicable to soil physics and mechanics and reaming techniques. Engineering challenges arising from the use of various cutting tools for reaming are also highlighted.
The study is devoted to the influence of drilling chemicals on characteristics of rubber samples IRP-1226, which are considered to be basic materials for the production of elastomers of a bottomhole motor. The results of the influence of four chemical reagents on the parameters of rubber samples IRP-1226 at different temperatures are introduced in the article. The synergistic effect of drilling chemicals and drill mud temperature on the elastomer of a bottomhole motor was confirmed. The description of the process, occurring in the elastomer, using various drilling chemicals, is presented. Application of the results allows to develop the methodology for improving the service life of elastomers of bottomhole motors.
Construction volume under abnormally low reservoir pressures conditions and drilling of mud losses is the reason for the necessity of using the lightweight cement. The article is devoted to the vapor permeability of cement stone.
The scientific work is devoted to the influence of clay inhibitors on the geometric parameters of the rubber samples IRP-1226, which is one of the basic materials for the production of elastomers the screw downhole motors. The results of the effect of the four types of inhibitors used as a reagent for drilling fluids to increase the stability of clay rocks to the parameters of the rubber samples IRP-1226. It proved the effect of clay inhibitors and their concentration on the elastomer of screw downhole motors. A description of the processes occurring in the elastomer in the presence of various chemicals. Characterized by the possible impact of these processes on the technical characteristics of the engine. Application of the results will allow to develop a technique to improve the resource elastomers screw downhole motors.
Circulation of drilling mud is provide by piston mud pumps, which are sources of non-uniform motion of fluid in the drill string. Oscillations of flow rate and pressure of washing liquid leads to increase agility drill bit, premature wear and malfunction of the bit; the leakage of the reservoir, and unstable operation of and failure of downhole motors, reducing component life of the pump; the discharge line is under high pressure because of the significant size fluctuations, leading to unforeseen negative consequences. The article presents the developed hydromechanical downhole compensator pressure fluctuations of the washing fluid that is installed in the bottomhole Assembly, describes the laboratory stand for testing and the results of its testing.
The scientific work is devoted to the influence of diesel fuel on the geometric parameters of the rubber samples IRP-1226, which is one of the basic materials for the production of elastomers, screw downhole motors. We consider the results of studies for the temperature of the medium range 25-90°C.
Hereby are demonstrated the results of the evaluation and benchmark study of drilling fluids influence on the ratio of a wellbore cavernosity and productive characteristics of gas condensate wells, Lower Cretaceous deposits, UNGKM after geological and technical measures for sidetracking.
The scientific work is devoted to the phenomenon of the generation of electric currents in rock destruction by drilling. It’s may be a promising new information channel of communication "well bottom-surface". The possibility of determining the value of speedrock-breaking tool by spectra of electric current for various geological, technical and technological conditions of the experiment. In addition, proof of the possibility of determining the technical condition of the bit on the characteristics of the electric currents. The use of the results will increase the efficiency and durability of the bit at the well bottom.