Day 3 Wed, August 29, 2018最新文献

{"title":"Well Control for Offshore High-Pressure/High-Temperature Highly Deviated Gas Wells Drilling: How to Determine the Kick Tolerance?","authors":"Chen Xuyue, Jin Yang, D. Gao, Yi Huang, Yanjun Li, M. Luo, Li Wentuo","doi":"10.2118/190969-MS","DOIUrl":"https://doi.org/10.2118/190969-MS","url":null,"abstract":"\u0000 Kick tolerance is a vital parameter for well control. It indicates if a shut-in operation can be performed or not, an appropriate method of well killing should be selected. However, the kick tolerance determination for offshore high-pressure/high-temperature (HP/HT) highly deviated gas wells drilling still remains as a challenge to the oil and gas industry due to the presence of narrow safe mud weight window of the HP/HT well section, complex borehole temperature profile, influx distribution and high frictional pressure loss. In this work, a model of volume kick tolerance specific for offshore HP/HT highly deviated gas wells drilling was presented based on the pressure bearing capacity of highly deviated open hole, casing shoe, casing, blowout preventer (BOP) and choke valve. Meanwhile factors affecting the volume kick tolerance were also investigated. The result shows that both of the volume kick tolerance for shut-in and the volume kick tolerance of well killing increase with wellbore inclination of the highly deviated section, and the highly deviated wellbore or highly deviated wellbore may have a much higher volume kick tolerance than that in vertical wellbore. With other parameters values setting constant in this case, the volume kick tolerance of well killing increases with the geothermal gradient while the increase rate is not obvious. This work provides a practical tool for enhancing well control in offshore HP/HT highly deviated gas wells drilling.","PeriodicalId":133825,"journal":{"name":"Day 3 Wed, August 29, 2018","volume":"156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126735938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated Reservoir Modeling while Drilling Enhances Horizontal Well Placement and Productivity in a Complex Offshore Field, Bohai Bay","authors":"Min Mao, Linlong Bai, Wenzhong Shen, Xiao Qiang Li, Z. Xia","doi":"10.2118/191065-MS","DOIUrl":"https://doi.org/10.2118/191065-MS","url":null,"abstract":"\u0000 Horizontal wells are being a common practice in offshore field development in Bohai Bay recently. Maintaining well trajectory in sweep spot while drilling is one of the key factors to optimize horizontal well’s productivity. However, great challenges are often faced in Bohai Bay area including survey uncertainties while drilling and reservoir geology variation. On the one hand, successful placement of a horizontal well requires accurate landing of the well in the right position and orientation in the reservoir. On the other hand, the trajectory is optimized based on structural geobody variation resulted from the uncertainty of parameters governing the static behavior of the field. Therefore, the ability to update geosteering model in timely manner and to proactively adjust well trajectory in real time are required.\u0000 This paper presents an innovative method in Bohai Bay by applying the technology of integrated seismic volume and reservoir geosteering model while drilling to achieve very promising productivity. That is to say, the new geosteering method includes seismic inversion of checkshot calibrating, single/multi-wells reservoir model updating, conventional logging while drilling, and mud logging etc. How to develop new horizontal well steering methodology and software integrated seismic volume of time (or depth) domain, logging while drilling, reservoir modeling result to optimize well planning and placement for high productivity?\u0000 Results from lower Neogene Minghuazhen formation tests executed in SuiZhong 36-1, Bozhong oilfield of Bohai Bay clearly demonstrate the following capabilities of the technology.Reduction of the steering need for the tools of distance to boundary included Directional and deep well placement tool.A bridge from three-dimensional geology model to two-dimensional geosteering model before drilling; vice versa, 2D geosteering model update 3D geological model after drilling.\u0000 More People grasp the systematical methodology of integrated reservoir geosteering model and trajectory optimizing while drilling which provide a higher degree of confidence in the drilling process.","PeriodicalId":133825,"journal":{"name":"Day 3 Wed, August 29, 2018","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115296231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}