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| Drilling. Mining |
29.12.07, E.G. Grechin, V.P. Ovchinnikov
CALCULATIONS OF CONFIGURATIONS OF A BOTTOM OF THE BORING COLUMN WITH SCREW HYDRODRILL AND TWO MOBILE CENTRATORS
http://www.ogbus.ru/authors/Grechin/Grechin_2.pdf (in Russian)
Calculations of configurations of a bottom of the boring column, including the screw hydrodrill and two mobile centrators are executed. Research of their stability to change of geometrical parameters and zenith angle is done. The opportunity of an effective utilization of configurations for stabilization and low-intensity increases of zenith angle is shown.
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17.12.07, N.A. Petrov, G.V. Conesev, I.N. Dawidova, M.M. Acodis
RESEARCH OF THE LUBRICANT ADDITIVE K-LUBE TO DRILLING FLUIDS
http://www.ogbus.ru/authors/PetrovNA/PetrovNA_13.pdf (in Russian)
The American nontoxic lubricant additive k-lube practically does not make foam clay solutions and does not influence their basic properties, thus effectively reduces stickiness, clay rind already at concentration 0.5-1.0%.
The reagent k-lube is compatible with flotoreagent-oxal, and at this ratio of foreign and domestic lubricant additives 1:1 a level of foaming in the field of its small (up to 1%) concentration
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26.07.07, G.G. Yagafarova, V.B. Barakhnina, E.G. Il'ina, I.R. Yagafarov
RESULTS OF BIOSTABILITY TESTING OF SOME POLYMERIC ADDITIVES IN THE DRILLING WATER
http://www.ogbus.ru/eng/authors/Yagafarova/Yagafarova_3.pdf
The purpose of the research is the biostability estimation of some drilling additives on basis of polyacrylamide, starch reagents and carboxymethylcellulose modification pertaining to association of microorganisms Rh. erythropolis VKM AC-1339D and Fusarium sp. no. 56. The more biostable from researched drilling additives for this microorganisms is the drilling additives on basis of polyacrylamide: sypan, DKS-extender, dk-drill. Choosing the right organic additive to the drilling water as to protect the environment we should take into consideration its experimental data of the biostability.
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07.05.07, O.G. Mamaeva, O.G Konesev, S.V. Mantrova
STUDY OF INTERACTIONS IN SYSTEM "METAL-FILTER CAKE" IN APPLICATION TO WELL DRILLING
http://www.ogbus.ru/eng/authors/Mamaeva/Mamaeva_1.pdf
In the given work the system "metal-filter cake" in application to well drilling is investigated on the basis of B.V.Derjaguin conception about the binomial law of friction. The appropriate method for study of antifriction properties of filter cake is offered. The influence of solid phase dispersion ability of a clay drilling fluid on its frictional properties is investigated.
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13.04.07, E.G. Grechin, V.P. Ovchinnikov
STABILITY OF NONORIENTABLE DRILLING HOOKUPS
http://www.ogbus.ru/authors/Grechin/Grechin_1.pdf (in Russian)
The analysis of stability of nonorientable drilling hookups with one and to two centralizers is executed. Drilling hookups with optimum geometrical parameters have the good characteristic concerning stability, but demand centralizers with the increased diameter. Ways of creation enough steady drilling hookups with more comprehensible geometrical parameters are shown.
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03.01.07, N.A. Petrov, A.V. Korenyako, I.N. Davydova, S.F. Komleva
PROCESSING OF BORING SOLUTION AT DRILLING WELLS WITH HORIZONTAL TERMINATION
http://www.ogbus.ru/authors/PetrovNA/PetrovNA_6.pdf (in Russian)
During drilling a skilled-technological well 1557/22 of Sugmutskoe deposit in a horizontal site of well as a basis the polymer-clay drilling mud was applied, which in usual slanted wells (Noyabrsky region) was applied.
The chemical processing of the solution included these materials and reagents: bent powder RVMA, SŒS, SAIPAN, POLYCEM-D, LUBE-167. The updating of the solution consists in additional processing by polymers and lubricant additives (LUBE-167 and graphite) and also by the complex of surface-active substances SNPKh-PKD-515. Last gave to the solution the inhibiting (clay hydration) and superficial-active properties. For increase of the solution density was used the carbonate weighting agent. The antitacking additive Paipe-Lax was in stock.
The installation of the filter FSG-146 was provided in a horizontal site. Before hermetic sealing of space is higher than the filter with the help of packer PDM-146 a washing solution, which taking place in a horizontal trunk, is replaced on a weak concentrated hydrochloric acid with the additive cationic surface-active substance 0,5-1,5 % of water repellent agent IVV-1.
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16.03.06, L.B. Khuzina, M.C. Gabdrakhimov
LABORATORY TEST RESULTS OF THE DYNAMICS OF THE DRILL
http://www.ogbus.ru/authors/Khuzina/Khuzina_2.pdf (in Russian)
The clause is devoted to the laboratory test of the dynamics of the dynamics of the drill. Some problems of determining of expedient drilling characteristics are considered in the work. There are also problems concerning the speed of the penetration of the vibratory booster chisel model into the granite and marble, depending the influence frequency. The clause is applied by the laboratory test results as diagram's and equations of the regression. It has been done the conclusion that to increase the speed of well drilling, especially the rotary it is necessary to develop, new designes of rock destructing bits with the frequency of dynamic influence ranging 145 Hertz.
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21.09.05, S.V. Grekov
STUDY OF HYDRAULIC COMMUNICATION CHANNEL OF MWD (MEASURING WHILE DRILLING) SYSTEM
http://www.ogbus.ru/authors/Grekov/Grekov_2.pdf (in Russian)
This paper describes a simulator of hydraulic communication channel of MWD system as a long-distance line with distributed parameters. Impacts of different parameters of the line (line length, attenuation factor, drilling fluid density, compensator pressure, etc) are analyzed in terms of reception of the signal transmitted from well bottom by simultaneous operation of pressure sensor and drilling fluid flow sensor.
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20.09.05, J.C. Cunha, B. Demirdal, P. Gui
QUANTITATIVE RISK ANALYSIS FOR UNCERTAINTY QUANTIFICATION ON DRILLING OPERATIONS. REVIEW AND LESSONS LEARNED
http://www.ogbus.ru/eng/authors/Cunha/Cunha_2.pdf
This paper presents comments and some background on the use of risk analysis methods in the oil and gas industry. Particularly attention is given to applications developed specifically for drilling operations. A literature review emphasizing articles written specifically for risk analysis applications on oil & gas well drilling operation is presented.
Recommendations for procedures related to risk analysis methods implementation as well as an example of application and its results are presented.
A Monte Carlo simulation was run to predict a cumulative distribution function for a well drilling AFE (Authorization For Expenditure.) The simulation procedure as well as the resultant cumulative distribution function is presented.
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16.09.05, S.V. Grekov
STUDY OF INTERFERENCES IN HYDRAULIC COMMUNICATION CHANNEL OF MWD (MEASURING WHILE DRILLING) SYSTEM
http://www.ogbus.ru/authors/Grekov/Grekov_1.pdf (in Russian)
This paper describes basic interferences affecting a signal transmission in hydraulic communication channel of MWD system. A separate study is performed for regular interferences caused by non-uniform operation of drilling pumps and random noises occurring in drilling tool operation.
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01.09.05, E.A. Volgemut, S.V. Grekov
STUDY OF EFFECT OF MWD (MEASURING WHILE DRILLING) SYSTEM WITH A HYDRAULIC COMMUNICATION CHANNEL ON OPERATION OF HYDRAULIC DOWNHOLE MOTORS AND THEIR EFFECT ON HYDRAULIC SIGNAL PARAMETERS
http://www.ogbus.ru/authors/Volgemut/Volgemut_1.pdf (in Russian)
This paper covers issues of reliable operation of hydraulic downhole motors combined with a MWD system with a hydraulic communication channel. Dependence between rotating speed of downhole motor shaft and hydraulic signal amplitude is calculated for different motor types. Change of hydraulic signal amplitude due to downhole pressure change is analysed considering wave parameters of hydraulic signal.
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25.06.04, Z.Z. Sharafutdinov, R.Z. Sharafutdinova
WATER-BAZE MUDS AND CONTROL OF RHEOLOGICAL PROPERTIES THEREOF
http://www.ogbus.ru/authors/Sharafutdinov/Sharafutdinov_2.pdf (in Russian)
A significant part in solving these problems is played by reological properties of drilling muds used in well construction. Analysis of drilling mud reological properties from standpoint of classical mechanics does not call for considering discreteness of their liquids at the level of suspension and constituon of the liquid itself, and does consider the properties of inter-particle forces acting inside them. All this impedes solution of technological problems in well construction.
The paper reviews the influence of nature of water behavior in drilling mud, chemical composition and thermodynamics properties of reagents on reological properties of drilling muds. Described are the basic ways of the rheological properties control.
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18.06.04, Z.Z. Sharafutdinov
WATER, ITS INFLUENCE ON PHYSICAL AND MECHANICAL PROPERTIES OF CLAY AND ARGILLIFEROUS ROCK
http://www.ogbus.ru/authors/Sharafutdinov/Sharafutdinov_1.pdf (in Russian)
Clay is an extremely hydrophilic material. It is always saturated with water, however water quantity and state depend on thermodynamic conditions of clay existence. Depending on state of water in clay, its physical and mechanical properties vary within a wide range. It affects the features of clay behavior in case of deep occurrence.
There is an opinion that depending on the ground pressure, hydrate water can exercise properties of metals. Metallization of hydrate bonding with pressure increase occurs smoothly, and its recovery to the initial atomic condition will happen discretely, by jumping. Therefore, for example, opening-out during clay drilling, with water that acquired metal properties, can result in occurrence of absolutely new phenomena. First of all, metallization of water properties applies corrections to clay properties through pore pressure. In course of drilling, the influence of ground pressure is removed from clay; therefore bonds recovery from metallic to atomic condition takes place in water. It manifests itself in the well, as a sharp increase is slough and rockslide with lifting a big amount of cuttings in the form of needle-like, arrow-type and scaly solid particles.
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21.04.04, Lyagov À.V. etc.
EXPERIMENTAL COILED TUBING DRILLING OF HORIZONTAL WELL WITH THE RUSSIAN EQUIPMENT AND TOOLS IN ANK "BASHNEFT"
http://www.ogbus.ru/authors/Lyagov/Lyagov_1.pdf (in russian)
In paper tells about the first results of the experimental drilling on depression of a horizontal well at ANK "Bashneft", with the help of a coiled tubing complex produced by domestic companies. The experiments with the coiled tubing devices working at the bottom-hole assembly (BHA) on aerated fluid have demonstrated their work capacity and possibility to control the pathway during the drilling process. The performance parameters and the indispensable technological modes of exploitation of a coiled tubing complex have been experimentally selected.
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25.02.04, Shokir E. M. El-M.
A NOVEL PC PROGRAM FOR DRILL STRING FAILURE DETECTION AND PREVENTION BEFORE AND WHILE DRILLING SPECIALLY IN NEW AREAS
http://www.ogbus.com/eng/authors/Shokir/Shokir_1.pdf
Drill string failure is due to a lot of reasons, which may occur either individually or in-group. In order to prevent or at least minimize occurring drill string failure, all reasons should be recognized. To do that, one should have a good designed approach to test all factors, affecting drill string failure, to early eliminate the problem. Early studied cases were analyzed without an overall approach and without revealing the actual reasons of the drill string failure.
This paper introduces a new interactive program that helps to recognize and prevent the drill string failure before and while drilling. The validity of this program is successfully approved by its application on some failure cases. Therefore, it could be successfully applied in other cases, and easier recognized if the drill string is close to fail and hence an immediate action is to be taken to improve the drilling parameters to prevent the drill string failure.
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14.04.03, Mukminov I.
FILTRATION VELOCITY FIELD IN THE ELLIPTICAL RESERVOIR DRAINED WITH A HORIZONTAL WELL
http://www.ogbus.ru/eng/authors/Mukminov/Mukminov_1e.pdf
The problem of fluid influx to the horizontal well drained the elliptical homogeneous-anisotropic reservoir is considered. The exact analytical solution for filtration velocity is obtained.
It is shown that the filtration velocity is maximal in the "end" points of the horizontal well. In case of circular reservoir the filtration flow is close to the radial one and the lines of equal velocities are nearly concentric circles, when the length of horizontal well is small. For middle-long and long horizontal well the filtration flow can be considered as a superposition of three constituting basic filtration flows: a linear-parallel one, which flows towards the central part, and two radial flows, which flow to the endings of the horizontal well.
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11.12.2001, Bela Mating, Tibor Bodi
EVALUATION OF THE DAMAGE SOURCE IN HYDROCARBON PRODUCING WELLS TO INCREASE THE PERFORATION EFFICIENCY
http://www.ogbus.com/eng/authors/Bodi/evalofdam.pdf
Besides the behavior of the hydrocarbon reservoir, the drilling and completion technology has a significant influence on the production capacity of oil and gas wells. When a well is not producing as expected, the formation may have low permeability or/and may be “damaged”. If the evaluation of the well productivity during the DST (Drill Steam Test) tests and the production of other wells in the same reservoir show that the production of the examined well should be higher we can look for the reason for the low production. If the reservoir permeability is low the well is the candidate of the stimulation by hydraulic fracturing. When the restricted flow into the wellbore caused by the improper well drilling or well completion technology then the near wellbore damage should be removed or decreased, and the completion technology should be corrected. In order to increase the efficiency of well completion and select the right well stimulation method we need to recognize the reason for the low production. After recognizing the source of low production we will be able to increase the well production by selecting and applying the suitable well stimulation method and we will be able to correct our drilling and completion technology in other to increase the production of the wells that will be drilled in the future.
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11.12.2001, Imre Federer
DEVELOPMENT OF DESIGN CRITERIA FOR WELL COMPLETION IN HORIZONTAL WELLS
http://www.ogbus.com/eng/authors/Federer/devofdesign.pdf
A well constructed horizontal production well can assure the most advantageous flowing conditions when the fluid content of the yield gas is not separated to a considerable extent in the environment of the bore bottom. However, in case of wells producing a high gas- fluid ratio, the intensive separation of fluid and gas in the horizontal section may cause failures of the well structure. For the time being, there is a serious uncertainty concerning hole gripping, system pressure and the effect of well structure influencing flow conditions. The clarification of effects influencing the flow conditions in a horizontal well section could be an important step in preventing the expected production problems, as well as from the point of view of the construction of a suitable well structure.
The present study reports on a series of tests for investigating the mixed flow of gas and fluid in a horizontal well section. Conditions of the design and development of the investigation equipment are presented. In the following, the analysis of horizontal well sections is proposed to be a factor to be considered in well design. During the investigation, flow diagrams have been made to analyze the impact of the casing liner - producing pipe on the flow chart.
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11.12.2001, R. Ismakov, A. Popov
WAYS OF IMPROVEMENT OF ROTARY BITS FOR OIL AND GAS WELLS DRILLING
http://www.ogbus.com/eng/authors/Ismakov/waysofimp.pdf
At the modern stage of the improvement and elaboration of new tools for drilling and repair of wells, an agreement of geometric parameters and flow process properties is necessary not only of the tool as a whole or its functional systems, but of the component parts of the functional systems with an actual distribution per them of kinematics, power and energetic characteristics of the mode of its operation. Such approach to the solution of this problem requires a statement and fulfilment of detailed researches of work relating to a wear for each system of the tool and its components. For ex, as for a rotary bit’s support its functioning and wear of bearings, sealing properties, a lubrication system operation, lubricants in specific conditions of the support’s functioning. Detailed research works, carried out at the university, allowed to underline weak parts of each system and concentrate efforts of the scientists, firstly, on the achievement of equal-strength of tool’s components, and then, on the elaboration of it at a new qualitative level.
This article is based on researches of the mechanical processes in mining rocks and rock- destruction tools, which started under the leadership of professor L.A. Shreiner and were continued at USPTU under the leadership of Prof. M.P. Mavliutov in the direction of a dynamic destruction of mining rocks when drilling and hydraulics of the zone attached to the well; Prof. A.I. Spivak in the direction of mining rocks abrasion and wear-resistance of rock-destructive tools and Prof. G.V. Konesev in the direction of tribotechnique, applying to the conditions of wells’ drilling.
At present, a complete school of researchers of these problems was formed at USPTU, and the authors of the represented article are included in this structure as well.
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11.12.2001, Tibor Szabo'
DRILLING THROUGH SHALLOW GAS ZONES IN HUNGARY
http://www.ogbus.com/eng/authors/Szabo/drillingthrough.pdf
The prospecting activity for CH is more than 60 years old in Hungary. During this long time we had 73 documented blowouts and more undocumented kicks. Well control was difficult and expensive here because of the abnormally high temperatures and the extreme overpressures of the formations. Among the blowouts we had 12 oil and gas, 1 steam with 180 C° surface temperature, 4 CO2 blowouts with -30 C° surface temperature. 15 rigs were destroyed, 10 craters were formed by the blowouts and, unfortunately, a thrown DC killed one toolpusher. Shallow gas blowouts are perhaps the most difficult well control problem. A shallow gas blowout on a rig can cause large financial losses. For example, a blowout resulted in the total loss of a rig in Hungary. This event created a fishing lake near to Hajdúszoboszló. Studying the previous blowouts is very important for the drillers, engineers and instructors so as to prevent any well control problems. The results, observations and conclusions help to change the practice and technology in order to avoid any risk situations during normal drilling operations. By the favorable results of the skilled, well-trained drillers, better and better tools and equipment, day by day practical experience, and the special Well Control Training School, we have had only one blowout in the last 10 years.
This paper reviews shallow gas blowouts while drilling in Hungary and discusses current industry myths about shallow gas, typical results from a shallow gas blowout that affect the kill operation, kill options, selection criteria and well killing guidelines. The objectives of this case study are to describe procedures which will reduce the risk and cost of controlling the flow if a blowout occurs and build the experiences into our training programs to prevent this accident. Conclusion of this study include the recommended well control procedures and the required well control equipment for Hajduszoboszlo field.
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11.12.2001, F.Agzamov, N. Karimov, K. Akchurin
PREPARATION OF EXPANDING OIL-WELL CEMENTS
http://www.ogbus.com/eng/authors/Agzamov/preparation.pdf
The report substantiates the expediency of employment of expanding oil well cements for well cementing. It considers the principles of preparation of cements with different binding base and expanding additives. The mechanism of sulphoaluminate and oxide expansion is shown. It studies the effect of different factors on the expansion value and kinetics. It presents the results of experimental investigation and oil well cement compositions.
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