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25 February 2017, Volume 4 Issue 1 Previous Issue    Next Issue

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Reliability Analysis for Deepwater BOP System CAO Shu-jie, WANG Dong-shi, WEN Ji-hong, JIN Xue-yi, SONG Lin-song 2017, 4 (1):  1-6.  Abstract ( 234 )   PDF (3440KB) ( 96 )    As key component of well control system, the reliability of deepwater blowout preventer (BOP) is extremely important to guarantee the safety and high efficiency of deepwater drilling. By analyzing failure accident cases in Gulf of Mexico and the South China Sea, combining security bulletins and maintenance experience of field failures, we analyze the failure mode of HYSY981 BOP system, perform failure mode and effect analysis (FMEA) of wellhead and sorted risk factors scientifically based on information evaluation model combined with risk priority number (RPN). Analysis results show that with the proposed method, we can find out the potential risk factors affecting the reliability of BOP system, and provide basis for operators to achieve the goal of deepwater BOP system reliability from risk prevention and control measures, risk treatment scheme, optimization of parts inventory, etc. Related Articles | Metrics

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Drill Cuttings Reinjection in Complex Fault Block Oilfield: Layer Selection Scheme Optimization and Engineering Practice YUAN Ze-ming, HE Peng-fei 2017, 4 (1):  7-13.  Abstract ( 235 )   PDF (4177KB) ( 103 )    Cuttings reinjection is becoming the effective technical means of waste disposal at sea, which involves the disposal of wellbore drilling cuttings, drilling fluid and oily sewage etc. For complex fault block oilfields, waste reinjection scheme selection is one of the most important contents. Based on the analysis on the reservoir geology, two reinjection schemes are proposed: using an existing production well, or constructing a reinjection well. Through comparative study on the two schemes in terms of layer selection, reinjection operation paramters and safety factors, it is determined to construct a new reinjection well. The reinjection layer is further selected and optimized according to the stratigraphic information and directional well data. Finally, the reinjection layer is obtained, which achieves good isolation and satisfies the need of slurry injection capacity, ensuring that slurry does not remain on the surface layer and not channeling reservoir pollution or other layers. Related Articles | Metrics

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Selection Analysis of Hydraulic Tube of Subsea Production Umbilical LI Bo, GUO Hong, GUO Jiang-yan 2017, 4 (1):  14-18.  Abstract ( 260 )   PDF (5797KB) ( 112 )    The hydraulic tube has an important impact on subsea production umbilical cost and performance. Choosing appropriate material and size of umbilical hydraulic tube can ensure reliable and economical operation of oil and gas fields. This paper analyzes the main materials of the current umbilical hydraulic tube, compares and analyzes the performance and adaptability of each material, and puts forward the factors that need to be considered when selecting the hydraulic tube material type. Through the method of hydraulic simulation, the simulation model of the diameter of the hydraulic tube in the umbilical is established, and the analysis method of the hydraulic tube size selection is given. This paper provides some reference for the selection of hydraulic tube in subsea production system umbilical. Related Articles | Metrics

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Research and Application of Drill Technique in Bohai Oilfield Buried Hill Reservoir HE Peng-fei 2017, 4 (1):  19-24.  Abstract ( 187 )   PDF (3535KB) ( 109 )    Different problems such as presence of formation leakage, poor drillability, drilling tool wear, difficult well trajectory control exist in offshore oilfield buried hill reservoir drilling development process. To solve these problems, first of all, an indepth analysis of the drilling, is made. Based on the analysis results, combined with the experience of offshore operations, several measures are applied, including managed pressure drilling (MPD), oil in water mud system, optimization of tools (especially bit, EcoScope, drag reducer and screw motor) and parameters optimization. With the application of these measures, trajectory control is achieved for all buried hill wells, the reservoir development purpose is attained, and no drilling accident happens. The use of these technologies forms a series of supporting solutions to the development of offshore oil field in buried hill wells. Related Articles | Metrics

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Development and Design of BOP Hoisting and Transport System for Jack-Up Platforms DU Yuan, MU Qing-lin, ZHOU Ying, LIU Jun, LUO Pei-hao, CAO Hui-ning 2017, 4 (1):  25-28.  Abstract ( 183 )   PDF (2310KB) ( 62 )    According to the related requirements for the hoisting and transport of blowout preventer (BOP) on site for jack-up platforms, we introduce a BOP hoisting and transport system. The system mainly consists of four parts: pneumatic BOP hoisting device, air winch, rail trolley, electric crane, etc. Using this system, the hoisting, handling, inserting, installation, adjustment, removal, repair, and maintenance for BOP equipment can be achieved. We also illustrate the potential market demand and the promising future of application for this scheme by introducing its configuration, basic parameters, performances and functions. Related Articles | Metrics

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Maximum Offset for the Emergency Disengagement and Control of the Deepwater Semi-Submersible Platform in Internal Wave JIANG Wei 2017, 4 (1):  29-36.  Abstract ( 301 )   PDF (5258KB) ( 66 )    In the South China Sea drilling operation, deepwater semi-submersible drilling platform experiences repeated wave interference, which causes a significant impact on equipment safety and platform operation. Considering the actual situation of internal waves acting on the semi-submersible drilling platform in the South China Sea as well as the semi-submersible drilling platform riser system used at present, the extreme motion condition of riser system is studied and analyzed. The maximum offset for the emergency disengagement of riser system, when the platform drifts as a result of internal wave, is put forward. Through the calculation example, the emergency disengagement conditions of semi-submersible platform under extreme conditions of internal waves are discussed. This research has important significance to the internal wave emergency management and the safety of deepwater drilling operation in the specific internal wave environment in the South China Sea. Related Articles | Metrics

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Study on the Characteristics of Flow Around Cylinder at Subcritical Reynolds Number JIANG Ke, ZHANG De-hua, QI Yu, SU Yang-xuan, ZHAO Yi, TIAN Run-hong 2017, 4 (1):  37-42.  Abstract ( 224 )   PDF (3644KB) ( 87 )    When the ocean riser is subjected to current of a certain velocity, flow around cylinder and vortex-induced vibration occur around the riser, causing serious damage to the safety of the riser. Two-dimensional numerical simulation of the flow around cylinder of the riser under subcritical Reynolds number is carried out. The parameters such as the resistance coefficient and the lift coefficient of the cylinder are investigated. Especially, the flow around a riser with an additional pipe is simulated, and the simulation results show that the additional pipe can help to suppress the flow around cylinder. This research has a certain reference value for the development of the offshore riser with additional pipes. Related Articles | Metrics

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Development and Application of Pipe Laying System Suitable for Flexible Pipe in Bohai Bay GONG Hai-chao, CHEN Wei, GONG Rui, WANG Ling-yu 2017, 4 (1):  43-47.  Abstract ( 251 )   PDF (3129KB) ( 95 )    Deployment of subsea flexible pipe just started in Bohai Bay, China. Suitable equipment and vessels for subsea flexible pipe installation are very limited for this area. With tremendous efforts, CNOOC Tianjin Branch and Neptune Offshore Engineering Development Company (NOED) successfully developed a flexible pipe laying system, which is particularly suitable for applications in Bohai Bay. By combining the horizontal rotating pipe storage carousel, tractor and embedding plough, the system is well suitable for transporting and installing subsea flexible pipes in Bohai Bay. The successful installation of the BZ 28/34 flexible pipes demonstrated the system’s adequacy. Related Articles | Metrics

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Humanization Design Discussion for Offshore Engineering General Layout LI Tao, LIU Jin-wei 2017, 4 (1):  48-52.  Abstract ( 310 )   PDF (2130KB) ( 84 )    With the continuous improvement of society and technology, the requirements for working environment and healthy are also optimized continuously, but the humanization design for offshore engineering general layout design still needs systematization and standardization. Combined with previous project experience and related standards, we discuss the design requirements and attention of humanization design for general layout from multiple views. Related Articles | Metrics

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Research on Emergency Shutdown Logic Optimization of Offshore Platform WANG Bin 2017, 4 (1):  53-57.  Abstract ( 396 )   PDF (3277KB) ( 76 )    The main purpose of offshore oil platform to set emergency shutdown system is, under accident conditions, to shut down the process system to protect the platform staff and engineering facilities, so as to prevent pollution and reduce the loss of the accident to the minimum. The conventional design of the emergency shutdown system defines four off levels. When production shutdown is triggered, the whole production platform is shut down, which ensures the safety of personnel and production platform, but shutting down equipment will also lower the platform production. Aiming at this problem, logic optimization of the emergency shutdown system is carried out. It is proposed to close the emergency shutdown system of certain equipment in the premise of ensuring the safety of personnel and platform to reduce the shut down equipment, improve platform output, and achieve cost-saving and efficiency-increasing. Related Articles | Metrics

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OEET Editorial Office 2017, 4 (1):  58-62.  Abstract ( 119 )   PDF (2377KB) ( 119 )     Related Articles | Metrics