Research and Application of High Efficiency Drilling Technology in Condensate Gas Field in Bohai Oilfield

2021 ◽  
Author(s):  
Peng Dou ◽  
Xiaocheng Zhang ◽  
Guojie Cui ◽  
Tao Xie ◽  
Guowei Zhu ◽  
...  
Keyword(s):  
Oil And Gas ◽  
High Efficiency ◽  
Production Capacity ◽  
Gas Field ◽  
Technology System ◽  
Drilling Technology ◽  
Target Layer ◽  
Speed Up ◽  
Reservoir Protection ◽  
The Cost

Abstract An oil-bearing structure in the southwest of Bozhong Sag in Bohai Oilfield contains large oil and gas reserves. It will be a key area for Bohai oilfield to increase reserves production. The main target layer in this block is the fractured granite formation in buried hill. Exploration work in this block is faced with many operational problems such as "deep burial, high temperature and high pressure (HTHP), low penetration rate, difficult reservoir protection, and low accuracy interface determination". Through technical research and field practice, aiming at "all well sections drilling rate speed-up, operation safely and efficiently, and releasing production capacity", a set of key technology system suitable for offshore oilfield deep exploration is formed. Since the application of this technology system, it has effectively improved the efficiency of well construction, greatly reduced the cost of exploration and operation, facilitated the discovery of oil and gas in multiple mid-depth strata. It has achieved a good operation effect on social and economic benefit.

scholarly journals Review on the Evaluation of Casing Damage Level in Oil and Gas Field

2019 ◽  
Vol 256 ◽  
pp. 02008
Author(s):  
Fangcheng Zhou ◽  
Tao Wang ◽  
Changqing Ma ◽  
Pengfei Lei ◽  
Xinyi Zhang ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Economic Benefits ◽  
Damage Classification ◽  
Gas Field ◽  
Damage Level ◽  
Damage Degree ◽  
Damage Repair ◽  
Casing Damage ◽  
Oil And Gas Field ◽  
The Cost

The casing damage is a common problem encountered in the oil and gas field, and the casing damage will cause huge losses to the economic benefits of the oil and gas field. Grading the damage degree of the casing damage well can provide theoretical support for the oilfield workover operation and save the cost of workover. The casing damage classification has a strong guiding significance for the economic evaluation of the casing damage repair and the development of appropriate workover technology. After a review research on domestic and foreigner papers on the study of casing damage classification, it can be found that there is no mature theory and method for casing damage classification. After analyzing the entire workover process, the concept of the damage repair evaluation expert system is proposed to complete the entire workover process, evaluate the cost, and help the oil and gas field to obtain the best benefits.

Mechanism and Application Effect of Compound Perforation Fracturing Technology in Low Permeability Reservoir

2014 ◽  
Vol 675-677 ◽  
pp. 1500-1504
Author(s):  
Zeng Li Xiao ◽  
Yong Jie Fan ◽  
Jun Bin Chen
Keyword(s):  
Oil And Gas ◽  
Influence Factor ◽  
Physical Property ◽  
Low Permeability ◽  
Gas Field ◽  
Low Permeability Reservoir ◽  
Fracture Pressure ◽  
Compaction Band ◽  
Oil And Gas Field ◽  
The Cost

Compound perforation fracturing technology is a space combination type ultra-deep perforating that can overcome some flaws conventional perforation has, such as shallow penetration and compaction damage. It can remove the compaction band and near wellbore pollution in rock matrix which results from conventional perforation. This paper introduces the theory of effect and influence factor of compound perforation fracturing technology and summarize the advantages for low permeability gas well on the basis of analyzing the mechanism of action about increase production of compound perforation. In order to evaluate the effects of application of this technology in in low permeability reservoir, 11 compound perforation wells and 12 conventional perforation wells were selected which have the similar physical property and the evaluation was conducted in two blocks. The results show that compound perforation can make the formation fracture pressure decrease in 3~5MPa and increase the permeability near the perforation channel. This technology has better effects than the conventional and decrease the cost effectively, improving production in low permeability oil and gas field.

scholarly journals The Application of Simple Controlled Pressure Drilling Technology in Yingxi Block

2018 ◽  
Vol 53 ◽  
pp. 03003
Author(s):  
ZHANG Guohui ◽  
Hugui ◽  
CHEN rong ◽  
LIU Xinyun ◽  
ZHANG Xiwen
Keyword(s):  
Oil And Gas ◽  
Gas Reservoir ◽  
Protection Effect ◽  
Fracture Development ◽  
Wellbore Pressure ◽  
Drilling Technology ◽  
Porosity And Permeability ◽  
Reservoir Protection ◽  
Oil And Gas Reservoir ◽  
Medium Type

Under the reservoir for exploration and development of Yingxi block in Qinghai oilfield, the chaigou formation is oil and gas reservoir complicated by the fault, and the exploration has been carried out over the years. The reservoir is a fracture - matrix pore dual medium type, with strong heterogeneity, fracture development degree, porosity and permeability variation range. The reservoir is very sensitive to wellbore pressure, the safety drilling density window is narrow, the conventional drilling leakage is frequent, the reservoir protection effect is poor, and the mechanical drilling rate is low. In 2016 six wells were selected for easy control and pressure drilling in the lower E23 formation. The technology experiment has obtained good application effect, which provides successful experience to solve the complex and improve the engineering quality and benefit.

Energy and resource saving timber drying

10.12737/6288 ◽  
2014 ◽  
Vol 4 (3) ◽  
pp. 199-204
Author(s):  
Курьянова ◽  
Tatyana Kuryanova ◽  
Платонов ◽  
Aleksey Platonov ◽  
Киселева ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Production Capacity ◽  
Climatic Conditions ◽  
Resource Saving ◽  
Dead End ◽  
Long Duration ◽  
Natural Wood ◽  
Drying Section ◽  
The Cost

Need of small woodworking companies in the efficient dryers of small capacity is very high. Used in industry dryers are very diverse in types and energy. Given that the processes of hydro-thermal treatment of wood are the most energy-intensive in woodworking technology, solutions to this problem are highly relevant. One of the most promising and low-cost ways is a combined method of drying timber with pre-atmospheric drying of wood. Natural wood drying is cheaper than chamber one. There are no expenses for the coolant, one of the major costs in drying chamber. One of the drawbacks of this dryer is the long duration and dependence on meteorological conditions. The solution to this problem is to create an incentive air circulation for material to be dried. For these purposes, the use of simple and cheap prefabricated elements of flow or dead-end type of shield materials, fitted with a fan, is possible. This design can also be the buffer stock for storing timber. Pre-drying of wood is made to a moisture content of 40-45%. Tests of this design have shown its high efficiency. The duration of subsequent chamber drying in the climatic conditions of Voronezh reduces by an average in 1,5 times, which is also reflected in the cost of the material being dried. In this case, the production capacity of the drying section of the company is increased by 20-35% depending on the species, the cross section of the material, the initial and transition humidity. Reduction of the specific heat consumption per 1 kg of evaporated moisture is about 10%. Drying of the wood becomes more equal, which helps to reduce shrinkage, reduce the value of internal residual stresses, which are one of the indicators of the quality of drying, as well as increased dimensional stability.

scholarly journals Method of effective circulation control of high speed fans impellors

2021 ◽  
pp. 92-100
Author(s):  
Vladimir Makarov ◽  
Keyword(s):  
Critical Points ◽  
Air Conditioning ◽  
High Speed ◽  
Oil And Gas ◽  
High Efficiency ◽  
Control Flow ◽  
Air Cooling ◽  
Circulation Control ◽  
Gas Cooling ◽  
The Cost

Research relevance. The high-level competitiveness of Russian oil and gas sector enterprises in the global economic space is impossible to reach without accelerating the restructuring of existing air-cooling apparatuses and developing new ones. It should be carried out with regard to modern technology introduction and advanced achievements in mining. The cost of gas cooling during its transportation via main gas pipelines in the cost structure reaches 22%. Besides, annual energy wastage on compressed gas cooling by fan installations is commensurate with the cost of the air cooling devices. It is essential to develop active means of air conditioning units control in order to improve their efficiency and aerodynamic adaptability that affect the competitiveness of oil and gas enterprises. ISSN 0536-1028 «Известия вузов. Горный журнал», № 4, 2021 99 Research aim is to develop a mathematical model for fan unit parameters active control. Research methods are based on the experimentally proven hypothesis about the dependence between the control flow rate on the impeller blades and the position of the rear critical points of the blades. Research results. A method was developed based on conformal transformations, the theory of residues, singular equations, and hydrodynamic analogy. The dependence between the position of the profiles critical points and flow circulation was obtained. The dependence of the aerodynamic adaptability of the fan units in air conditioning devices on effective critical point position and the energy characteristics of the impeller blades flow controlling source has been established. A patent was obtained for the fan unit impeller with active circulation control from air flow sources from the fan casing. High efficiency of the developed circulation control method for increasing the operational efficiency and aerodynamic adaptability of air-cooled fan units has been proved. An aerodynamic scheme of ОV 121TN was developed. A fan unit OGM VU2.7-1.8K4 with aerodynamic adaptability increased by 34% was created.

Successful Implementation of the PMCD Technology for Drilling and Completing the Well in Incompatible Conditions at Severo – Danilovskoe Oil & Gas Field

2021 ◽  
Author(s):  
Dmitry Krivolapov ◽  
Ivan Masalida ◽  
Artem Polyarush ◽  
Vyacheslav Visloguzov ◽  
Alexey Averkin ◽  
...  
Keyword(s):  
High Pressure ◽  
Oil And Gas ◽  
Back Pressure ◽  
Successful Implementation ◽  
Drilling Mud ◽  
Gas Field ◽  
Lost Circulation ◽  
Well Completion ◽  
Drilling Technology ◽  
Operating Window

Abstract This paper discusses the successful implementation of PMCD (Pressurized Mud Cap Drilling) technology at Severo – Danilovskoe oil and gas field (SDO) located in the Irkutsk region. The abnormally high-pressure reservoir B1 and the abnormally low-pressure reservoir B5 are the target layers in this field. Wells drilling at SDO is accompanied with simultaneous mud losses and inflows conditions, especially if the strata B1 is being penetrated. Pumping lost circulation materials (LCM) and cement plugs do not solve lost circulation complications which subsequently lead to oil and gas inflows. As a result, most of such wells are getting abandoned. It was assumed that complications in this formation occurs due to the narrow safe pressures’ operating window (ECD window), therefore, the managed pressure drilling technology (MPD) was initially used as a solution to this problem. However, after the penetration of the abnormally high formation pressure B1 horizon with a pore pressure gradient of 1.86 g/cm3 it was found that there is no operating window. In this regard, there were simultaneous mud losses and oil and gas inflows during the circulation. The well was gradually replaced by oil and gas, regardless of the applied surface back pressure value in the MPD system. The mixing of the mud and reservoir fluid was accompanied by catastrophic contamination. As a result, the drilling mud became non - flowing plugging both the mud cleaning system and the gas separator. On the other hand, the plugging of the B1 formation with LCM did not bring any positive results. Bullheading the well followed by drilling with applied surface back pressure and partial mud losses gave only a temporary result and required a large amount of resources. An implementation of PMCD technology instead of MPD has been proposed as an alternative solution to the problem. This technology made it possible to drill the well to the designed depth (2904 - 3010 m interval). For tripping operations, as well as the subsequent running of the production liner it was necessary to develop an integrated plan for well killing and completion in extreme instability conditions. As a result of various killing techniques application, it became possible to achieve the stability of the well for 1 hour. Oil and gas inflows inevitably occurred when the 1 hour lasted. Based on these conditions, the tripping and well completion process was adapted, which in the end made it possible to successfully complete the well, run the liner and activate the hanger in the abnormally high-pressure reservoir.

scholarly journals NEW WELL RESEARCH TECHNOLOGY IS THE KEY TO THE INTEGRATED DEVELOPMENT OF OIL AND GAS FIELDS

2021 ◽  
pp. 61-70
Author(s):  
Bogdan LELYK ◽  
Valerii STELMAKH
Keyword(s):  
Oil And Gas ◽  
High Efficiency ◽  
Point Of View ◽  
Gas Field ◽  
Technology Application ◽  
Formation Evaluation ◽  
Advantages And Disadvantages ◽  
Research Technology ◽  
Fluid Saturation ◽  
Effective Technology

 A detailed analysis of the available nuclear methods for well logging was carried out to select an effective technology from the point of view of obtaining true petrophysical data characterizing the formation matrix and fluid saturation at a specific point of time. The goal of these process is research currently available nuclear technologies designed for the Oil and Gas field formation evaluation and to review results of the implementation of QUAD NeutronTM (product of Roke Technologies Ltd (Canada)) in old wells in Ukraine.  Reviewed are pulsed neutron technologies available from leading International Logging Companies, which are widely used in Ukraine, including the QUAD NeutronTM, to determine primary petrophysical properties and the reservoir saturation characteristics. Certain criteria have been established that signifi cantly impacted quality of the data analysis during interpretation. These included the number of casing strings installed, absence of Open Hole data as input, drill bit size, presence or absence of cement in the annulus and several others. The advantages and disadvantages of each of the systems are shown and effective examples of application with recommendations and test results are provided in this paper.  Since 2009 QUAD NeutronTM was successfully utilized in more than 3000 wells worldwide. The geography of technology application covers such countries as Canada, USA, Russia, Azerbaijan, Malaysia, Colombia, Venezuela, Peru, China, Nigeria, Mexico, Georgia, Thailand, Kazakhstan, and Saudi Arabia. The following list of IOC, NOC and other international E&P companies contains only some of the users of the data provided by QUAD NeutronTM: Shell, Lukoil, Petronas, Repsol, Cenovus, Talisman, Murphy, Rosne] .  «GEO-DELTA-KB» LLC has exclusive rights to QUAD NeutronTM technology on the territory of Ukraine since 2018. Equipment has been used to provide valuable formation evaluation data to such clients as Ukrgasvydobuvannya, Ukrna] a and other domestic companies in the Western and Eastern regions. Data gave been acquired in dozens of old Oil and Gas wells. The obtained results demonstrate the high efficiency of the technology application, especially when making decisions for the reactivation of old wells.  Conducted analysis of existing nuclear logging methods allowed selection of the most effective technology as compared under similar conditions. The data obtained as a result of interpretation, together with an understanding of the processes occurring in the wells, contributed to providing reliable information for making informed decisions. The most eff ective application of the QUAD NeutronTM technology in Ukraine appears to be for the reevaluation of old wells with complex design (up to 4 strings of casing) to identify missing pay zones, assess the potential of existing reservoirs, determine the presence or absence of cement in the annulus, waterfl ooding zones, etc. The technology can also be successfully used for evaluating active wells and in openhole wellbores. 

Main approaches to estimating the cost of shareholder equity of oil and gas producers

2020 ◽  
Vol 26 (3) ◽  
pp. 685-697
Author(s):  
O.V. Shimko
Keyword(s):  
Oil And Gas ◽  
Oil Prices ◽  
Minimum Cost ◽  
Free Cash Flow ◽  
Annual Reports ◽  
Comparative Approach ◽  
Economic Activities ◽  
Advantages And Disadvantages ◽  
Oil And Gas Producers ◽  
The Cost

Subject. The study analyzes generally accepted approaches to assessing the value of companies on the basis of financial statement data of ExxonMobil, Chevron, ConocoPhillips, Occidental Petroleum, Devon Energy, Anadarko Petroleum, EOG Resources, Apache, Marathon Oil, Imperial Oil, Suncor Energy, Husky Energy, Canadian Natural Resources, Royal Dutch Shell, Gazprom, Rosneft, LUKOIL, and others, for 1999—2018. Objectives. The aim is to determine the specifics of using the methods of cost, DFC, and comparative approaches to assessing the value of share capital of oil and gas companies. Methods. The study employs methods of statistical analysis and generalization of materials of scientific articles and official annual reports on the results of financial and economic activities of the largest public oil and gas corporations. Results. Based on the results of a comprehensive analysis, I identified advantages and disadvantages of standard approaches to assessing the value of oil and gas producers. Conclusions. The paper describes pros and cons of the said approaches. For instance, the cost approach is acceptable for assessing the minimum cost of small companies in the industry. The DFC-based approach complicates the reliability of medium-term forecasts for oil prices due to fluctuations in oil prices inherent in the industry, on which the net profit and free cash flow of companies depend to a large extent. The comparative approach enables to quickly determine the range of possible value of the corporation based on transactions data and current market situation.

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