Jack-up platform"Kantan 2"is taken as the research object,it is studied to develop a fast and accurate approach for performing structural reliability analysis and providing evidence to make decision that the platforms need shutdown and maintenances.An acceleration sensor vibration monitoring system was designed,and on-site testing and the acquisition and process of vibration signal data were conducted for obtaining the structural natural frequencies and modes of the platform.Verification of the accuracy of platform simulation model was carried out through the comparisons of the monitoring and simulation model analysis results.It indicates that the simulation model is acceptably accurate since the results of the monitoring and simulation model calculation are close.Both the reliability analysis approach and the monitoring evaluation techniques of simulation model proposed in the paper are extensively valuable for assessment of jack-up safety.
The single well production is required to be high in the offshore gas field.Logging interpretation is only required to have high accuracy of porosity,permeability and saturation and high coincidence rate of interpretation conclusions,but also to provide the logging evaluation of whether the reservoir has production value(predicted productivity).In recent years,the main evaluation object is tight reservoirs,which further increase the difficulty of logging evaluation.In this paper,three methods are used to solve the practical problems in the above work.Firstly,quantitative interpretation models and parameters are determined by dividing sedimentary facies,The second step is to use neural network methods to identify fluid properties.The third step is to use logging parameters to predict production capacity.The results indicate that establishing a targeted logging interpretation model by dividing sedimentary facies can improve the accuracy of quantitative interpretation parameters.Neural network methods can help identify fluid characteristics.Under similar geological and engineering conditions,the porosity,permeability,and saturation of well logging data can be used to estimate reservoir productivity.The above methods have shown good results in practical applications and expand the application range of logging data.
This paper introduces the related knowledge of H-4 subsea connector in detail.Through the force analysis of its main functional component'locking ring',the reason that the connector can seal the higher wellbore pressure with lower control pressure is revealed.Through the force analysis of another functional component'latch segment',the essential reason for the unlocking failure of the connector is revealed.Combined with other theories and calculations,the phenomena in the two typical cases are explained.Finally,the solutions,treatment suggestions and preventive measures for the unlocking failure of H-4 connector are put forward for the reference of relevant practitioners.
The developed gas reservoirs in East China Sea are mainly distributed in the central anticline belt and the western slope belt of XH Depression.The gas reservoir type is mainly water drive gas reservoir.After the gas reservoir is put into development,it is generally faced with the problem of water production,which affects the recovery of gas reservoir.In order to effectively improve the development effect of water drive gas reservoirs in East China Sea,the development characteristics of developed water drive gas reservoirs was systematically analyzed,and the water production characteristics and main controlling factors in different development stages were summarized.A full-cycle waterproof and water control strategy of'early waterproof,process water control and later drainage'was established,and supporting technologies such as horizontal well trajectory optimization and horizontal well variable density directional perforation were developed.Through the use of full-cycle water-proof and water-control development countermeasures,the water-free gas recovery period of gas wells in East China Sea water-drive gas reservoir has been significantly improved.After the gas well is produced,reasonable drainage measures are adopted to effectively improve the cumulative production level of water-producing gas wells.
There are limited drilling data and few development layers in Block C of East China Sea,and the development effect of the main reservoir is not ideal.The application of reservoir geophysical technology in the development evaluation and adjustment of oil and gas reservoirs in Block C of East China Sea is aimed at improving the overall development effect of the block.For the new strata,reservoir description and potential prediction are carried out by means of geophysical techniques such as trap description and gas prediction,so as to realize the increase of reserves and production of new layers and the efficient production of low amplitude oil and gas reservoirs with low bottom water.In response to the low recovery rate,low production rate,and high water content of the main reservoir,geophysical techniques such as seismic forward modeling,seismic facies characteristics and seismic attributes were used to carry out fine reservoir analysis,guiding distribution prediction of remaining oil and gas and adjusting potential research.Reservoir geophysical technology plays a good role in the development evaluation and reservoir adjustment of Block C in East China Sea,which can provide reference for development of other similar blocks.
