Iteration and evaluation of shale oil development technology for continental rift lake basins

By benchmarking with the iteration of drilling technology,fracturing technology and well placement mode for shale oil and gas development in the United States and considering the geological characteristics and development difficulties of shale oil in the Jiyang continental rift lake basin,East China,the development technology system suitable for the geological characteristics of shale oil in continental rift lake basins has been primarily formed through innovation and iteration of the development,drilling and fracturing technologies.The technology system supports the rapid growth of shale oil production and reduces the development investment cost.By comparing it with the shale oil development technology in the United States,the prospect of the shale oil development technology iteration in continental rift lake basins is proposed.It is suggested to continuously strengthen the overall three-dimensional development,improve the precision level of engineering technology,upgrade the engineering technical indicator system,accelerate the intelligent optimization of engineering equipment,explore the application of complex structure wells,form a whole-process integrated quality management system from design to implementation,and constantly innovate the concept and technology of shale oil development,so as to promote the realization of extensive,beneficial and high-quality development of shale oil in continental rift lake basins.

Rock mass structural recognition from drill monitoring technology in underground mining using discontinuity index and machine learning techniques

A procedure to recognize individual discontinuities in rock mass from measurement while drilling(MWD)technology is developed,using the binary pattern of structural rock characteristics obtained from in-hole images for calibration.Data from two underground operations with different drilling technology and different rock mass characteristics are considered,which generalizes the application of the methodology to different sites and ensures the full operational integration of MWD data analysis.Two approaches are followed for site-specific structural model building:a discontinuity index(DI)built from variations in MWD parameters,and a machine learning(ML)classifier as function of the drilling parameters and their variability.The prediction ability of the models is quantitatively assessed as the rate of recognition of discontinuities observed in borehole logs.Differences between the parameters involved in the models for each site,and differences in their weights,highlight the site-dependence of the resulting models.The ML approach offers better performance than the classical DI,with recognition rates in the range 89%to 96%.However,the simpler DI still yields fairly accurate results,with recognition rates 70%to 90%.These results validate the adaptive MWD-based methodology as an engineering solution to predict rock structural condition in underground mining operations.

The characteristics of recycling gas drilling technology

Recycling gas drilling is a new drilling technology. This paper can be divided into three parts, with the purpose of introducing and analyzing the characteristics of this new technology. First, the major equipment characteristic of this technology was introduced. Secondly, compared with conventional gas drilling, Angel＇s model was used to analyze the wellbore flow characteristics. Due to the closed loop and the effect of back pressure caused by the equipment, the gas flow rate decreases dramatically during drilling. Apart from this, it is also found that the kinetic energy at the casing shoe is always smaller than that at the top of the collar. The proposing of the drilling limit concept points out the basic difference between the two gas drilling technologies. Lastly, according to the results of the theoretical analysis, gas supplement operations for the wellbore must be conducted. Thus, two gas supplement schemes are presented in this paper, to provide some guidance for field operations.

Managed Pressure Drilling Technology,As the Lost Piece of the Drilling Puzzle,Results in More Economical Benefits

The economics of drilling wells is important as we drill deeper wells whether offshore or onshore. Drilling-related problems,including stuck pipe,lost circulation,and excessive mud cost,show the need for better drilling technology.If we can solve these problems,the economics of drilling the wells will improve,thus enabling the industry to drill wells that were previously uneconomical.Managed pressure drilling techniques,at one time,having

Advances in Drilling Instead of Trenching Technology

Traditional surface exposure methods,such as trenching and exploratory shaft sinking,have their own limitations and do harm to the environment.Thus,shallow drilling was applied in geological mapping to expose shallow orebody and to determine the thickness of top soil layer,and then to illustrate bedrock lithology and geological boundary.It can also help to study geological structures and to reveal the orebody shape,and further to combine with rock core sampling and chemical analysis to develop the systematic method of drilling instead of trenching technology.

Managed Pressure Drilling Technology:A Research on the Formation Adaptability

Existing pressure drilling technologies are based on different principles and display distinct characteristics in terms of control pressure and degree of formation adaptability.In the present study,the constant-bottomhole-pressure(CBHP)and controlled-mud-level(CML)dual gradient drilling methods are considered.Models for the equivalent circulating density(ECD)are introduced for both drilling methods,taking into account the control pressure parameters(wellhead back pressure,displacement,mud level,etc.)and the relationship between the equivalent circulating density curve in the wellbore and two different types of pressure profiles in deep-water areas.The findings suggest that the main pressure control parameter for CBHP drilling is the wellhead back pressure,while for CML dual gradient drilling,it is the mud level.Two examples are considered(wells S1 and B2).For S1,CML dual gradient drilling only needs to adjust the ECD curve once to drill down to the target layer without risk.By comparison,CBHP drilling requires multiple adjustments to reach the target well depth avoiding a kick risk.In well B2,the CBHP method can drill down to the desired zone or even deeper after a single adjustment of the ECD curve.In contrast,CML dual-gradient drilling requires multiple adjustments to reach the target well depth(otherwise there is a risk of lost circulation).Therefore,CML dual-gradient drilling should be considered as a better choice for well S1,while CBHP drilling is more suitable for well B2.

Deep Drilling Technology of China

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Drilling Fluid System & Technology in Sichuan Gas Field

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Rapid Development of Drilling Technology and Market of China

The directional and cluster drilling technology developed very fast in 1980s.4317 directional wells were completed by CNPC during the period of the"Seventh Five-Year Plan”which was 4.65 times.that of the"Sixth Five-Year Plan".The CNPC completed 1759 directional wells in 1991 and 1900 direetional wells in 1992.which was 20%of the total wells completed in the same years.

Study on Hardening and Reuse Technology of Drilling Waste

In order to meet the increasingly strict environmental requirements and achieve the comprehensive utilization of waste in drilling operation,three techniques were used to harden the drilling waste.The three techniques are cement hardening technology,fly ash hardening technology and quicklime-sodium silicate hardening technology.Orthogonal analysis was used to evaluate and optimize the experimental results from the three techniques.The results show that the hardening system of quicklime-sodium silicate is not satisfying,and the compressive strength of hardened body is only 1.32 MPa.The optimal mass ratio in cement hardening system is drilling waste∶water∶YHJ1∶YHJ2∶YHJ3∶cement = 10∶4∶3.2∶2.2∶0.5∶4.The optimal mass ratio in fly ash hardening system is drilling waste∶water∶YHJ1∶YHJ2∶YHJ3∶fly ash = 10∶4∶3.2∶1.8∶1.5∶2.The compressive strength reaches 3.19 and 2.95 MPa respectively.Based on this strength,the hardened body can be used as low-strength building bricks,subgrade or nutrition bowls in arid regions to achieve the reuse of drilling waste.

Progress in the Ultradeep Well Drilling Technology of SINOPEC

Ultra-deep formations in China contain rich hydrocarbon resources.In recent years,the number of ultradeep wells has been continuously increasing.However,efforts to facilitate tlte drilling and exploration of these ultra-deep reservoirs are facing many challenges,such as complicated formation pressures,complicated formation lithologic features,complicated formation fluids,difficulties in the accurate calculation of formation parameters,difficulties in borehole structure design optimization,instabilities in the performances of drilling fluid and key cementing materials/systems,high temperature-resistance and pressure-resistance requirements for downhole tools and instruments,complicated engineering problems,and slow drilling speeds.Under such circumstances,it is very difficult to ensure the performance of such drilling operations.In order to address these challenges,SINOPEC has developed relevant drilling technologies for ultra-deep wells in complicated geological conditions through intensive research on accurate descriptions of complex geologic characteristics,borehole structure design optimization,fast drilling techniques for deep and hard formations,temperature-resistant highdensity drilling fluid,anti-channeling cementing in high-pressure gas wells,borehole trajectory control in ultra-deep horizontal wells and other key technologies.These technologies can provide sound engineering and technical support for tlte exploration and development of hydrocarbon resources in ultra-deep formations in China.

Petroleum Patent Used Such Monitoring Technological Like Innovation Process of Drilling Fluids with Xanthan Gum ——World Panorama

This paper aims to discuss the importance of patenting and publishing as an instrument of incentive to technological innovation in the petroleum chemistry area. The present study has examined the publications and the patent applications published from 1974 to 2014. A technological monitoring methodology for patents in drilling fluid with xanthan gum has been compared using profiles of patent application in the world, with emphasis on Industrial Property Databases available on the internet (INPI-Br, Derwent, Espacenet, Patent Scope and USPTO) with intention to assess the main inventors, applications, applications’ countries, the IPC classification, years of application and category of claims as well as discuss the importance of patents as a means of encouraging technological innovation of xanthan gum. The United States and China stand out both in relation to the publication of papers as well as in the amount of patent filing in scientific publications with the theme drilling fluid with additive xanthan gum classified by the authors’ country of origin. It is observed that Brazil and the US lead the ranking with 15 publications (about 23.1% of the total). Among the 72 institutions obtained as a result, both Petrobras SA and Universidade Federal do Rio de Janeiro, in Brazil, lead the world ranking, with 6 publications each;in relation to the areas of knowledge, it is observed that engineering stands out in the publication of papers and the areas of chemistry, engineering, energy fuels and polymer science are noticeable in numbers of patent applications. The analysis of patent filings in the periods proposed features a significant percentage associated with the classification C09K.

Study on the general layout of semi-submersible offshore drilling platforms based on process flow

The general layout of 6th generation semi-submersible drilling platforms is the main factor impacting the efficiency of their drilling operations. This paper provides a compound/integrated algorithm based on process flow that is aimed at improving efficiency, while giving attention to stability and safety at the same time. The paper describes the process flow of dual drilling centers and a hierarchical division of rigs based on the different modes of transportation of various drilling support systems. The general layout-centripetal overall arrangement spatially was determined based on drilling efficiency. We derived our modules according to drilling functionality; the modules became our basic layout units. We applied different layout algorithm to mark out the upper and lower decks. That is, the upper deck was designed based on the lowest transportation cost while the lower deck＇s calculations were based on the best-fit scope. Storage configurations in columns and pontoons were also considered for the layout design. Finally the center of gravity was taken into consideration and the general layout was adjusted accordingly, to result in an optimal center of gravity. The methodology of the general layout can provide a reference for implementation of domestic designs of semi-submersible rigs.

Formation and Control of Drilling Burrs

In this paper, a new forming model of the feed direction burr for drilling process is presented. The feed direction burr formation is experimented and studied. The related theories are analyzed, and the influential factors of the feed direction burrs are pointed out. Furthermore, a certain number of new measures to prevent and decrease the burr in drilling process are advanced.

Research on slim-hole drilling technology for shale gas geological survey in China

Over the last 10 years,the China Geological Survey has deployed 137 slim-hole shale gas geological exploration wells for coring entire wellbores.These wells are primarily located in new blocks and geological formations where neighboring well data are insufficient,beyond the scope of developed oil fields in China,or outside of oil and gas company mining-right areas.The drilling rig equipment,coring tools,and core drill bits of slim-hole shale gas drilling technology are different from those associated with traditional petroleum drilling.Many studies have been conducted on non-coring slim-hole drilling technology.This paper focuses on coring technology and drilling safety,summarizing a set of high-efficiency shale gas drilling equipment and technology systems based on geological drilling equipment and techniques(that can be used for solid mineral exploration).We report on:1)an improved vertical shaft drilling rig adapted to shale gas well control safety;2)high-efficiency core drilling techniques,focusing on coring tools,and techniques incorporating an inverted tower drilling tool combination,air circulation follow-through technology,and expanded casing technology;3)research progress on high-efficiency core drill bits,including non-planar tooth polycrystalline diamond compact bits and impregnated diamond core bits,along with their application effects.This research provides substantial advances in drill-core technology and improvements in exploration efficiency.Moreover,it provides a reference frame for well structural design and selection of construction technology for shale gas exploration drilling projects.

Evolution and application of in-seam drilling for gas drainage

The presence of seam gas in the form of methane or carbon dioxide presents a hazard to underground coal mining operations.In-seam drilling has been undertaken for the past three decades for gas drainage to reduce the risk of gas outburst and lower the concentrations of seam gas in the underground ventilation.The drilling practices have reflected the standards of the times and have evolved with the development of technology and equipment and the needs to provide a safe mining environment underground.Early practice was to adapt equipment from other felds,with rotary drilling being the only form of drilling available.This form of drainage allowed various levels of gas drainage coverage but with changing emphasis,research and development within the coal industry has created specifc equipment,technology and practices to accurately place in-seam boreholes to provide effcient and effective gas drainage.Research into gas content determination established a standard for the process and safe levels for mining operations to continue.Surveying technology improved from the wire-line,single-shot Eastman survey instruments which was time-dependent on borehole depth to electronic instruments located in the drill string which transmitted accurate survey data to the drilling crew without time delays.This allowed improved directional control and increased drilling rates.Directional drilling technology has now been established as the industry standard to provide effective gas drainage drilling.Exploration was identifed as an additional beneft with directional drilling as it has the ability to provide exploration data from long boreholes.The ability of the technology to provide safe and reliable means to investigate the need for inrush protection and water drainage ahead of mining has been established.Directional drilling technology has now been introduced to the Chinese coal industry for gas drainage through a practice of auditing,design,supply,training and ongoing support.Experienced drilling crews can offer site specifc gas drainage drilling services utilising the latest equipment and technology.

Scientific Drilling-to Construct the Telescopes that Inserting to the Earth Interior

Mankind live in the earth for countless years, but until now;people do not really understand the connotation of the Earth. We know that the earth composition including the lithosphere, the asthenosphere, mantle and core. Of course, the lithosphere supports all the life on Earth. For a long time, geoscientists trying to use all kind of methods such as geological, geophysical and geochemical methods to detect and study the earth, but the knowledge about earth are mostly indirect. Through the direct observation to the lithosphere, people can understand and recognize the plate movement of ocean and the mainland, crustal stress, earthquakes, volcanic processes, deep resources, the origins of life, global climate change and biodiversity. They are all the basis of a series of geosciences problems(Su and Yang, 2010). Geological specimens, especially the true samples from deep of the Earth, are the most directly study subjects for geologists. But the only way to access the true samples from deep of the earth is drilling. The most directly relevant evidence always originated from the deep of the earth, such as core, cuttings, fluid samples and other physical samples. Continental scientific drilling has been demonstrated which is an efficient technique for directly obtaining information from the Earth’s surface to the deep crust, and is acknowledged as ―to build a telescope inserting to the interior of the Earth‖, as well as ―a key for opening the door of the Earth‖. Over the last four decades, continental scientific drilling has achieved great success in enhancing our knowledge of the Earth, and in providing information on mineral resources, large engineering projects and global change. SinoProbe-05 is a new scientific drilling venture,which builds on the success of the Chinese Continental Scientific Drilling Project(CCSD), and is similar to the current major scientific drilling project on the Wenchuan earthquake fault. SinoProbe-05 will focus on 6 critical tectonic and mineral resource regions, including the Jinchuan Cu-Ni sulphide deposits in Gansu, the Luobusa chromite deposits in Tibet, the Tengchong volcano-thermal tectonic zone in Yunnan, the Yudu-Ganxian polymetallic deposits in South China, the Tongling polymetallic deposit and the Luzong volcanic basin and mineral deposit district in Anhui. As of the end of 2013, all of these pilot holes have been completed, all of them have achieved the desired scientific objectives. The construction of another ICDP project, Songke No.2 well, has come to an end. Current well depth is 5929 m. Drilling throughout the Cretaceous strata is just around the corner(The design well depth is 6400 m.). This will be the first complete Cretaceous stratigraphic profile in the world. The deep exploration project which will be stared soon will build a large number of different depths of scientific drilling holes. The deepest hole depth will reach to 13000 m. We believe that the construction of these scientific coring drilling holes will provide geologists with a lot of real core samples. These cores can meet the needs for different geoscience research areas. No doubt, the research results based on these cores will promote China’s geological science research to a new height, of course;will also contribute to the progress of the world’s earth science. This is also a good opportunity to promote China’s drilling technology. So, we know that no advanced drilling technology, no enough high quality samples from the deep of the Earth, the in-depth studies for geosciences will be restricted of course(Zhang et al., 2013).

New Technology Promoting Advance of China's Petroleum Industry

In the recent years,CNPC has examined and approved more than 600 items of gadgets for extensive application.The approved projects inc-lude both single item of advanced and applicable technology and a number of items of supporting technology which are broght together in one area to solve the regional problems and boost the production capacity.As the economic reform is making progress,,theI mandatory planned system will be gradually replaced by the new guiding planned managerial system.

New technology opens the door for deepwater development

The paper provided an updated status of technology for deepwater field development, demonstrated the importance of its application through actual project example, and discussed some future technical development trends. The focus was on the floating structures. By reviewing some of the engineering aspects of the project, the technology advancement, innovations and challenges in offshore engineering were discussed and demonstrated. The author’s view of technical challenges facing deepwater forwarding was discussed, which covered water depth limitations, new material application, installation methods, riser development and operational issues. An overview of technologies that will enable deepwater projects to be extended into new frontiers was presented.